Wdm Patents (Class 398/68)
  • Patent number: 10951320
    Abstract: An apparatus for generating a broadband single-sideband signal based on a laser diode includes a first optical coupler configured to receive an optical carrier signal to divide the optical carrier signal into signals corresponding to a plurality of paths, a hybrid coupler configured to perform Hilbert transform on a radio frequency (RF) signal, a first slave laser and a second slave laser each configured to modulate optical output powers of the divided optical carrier signals by using a Hilbert-transformed RF signal, and a second optical coupler configured to receive an optical output power-modulated optical carrier signal to output a single-sideband signal.
    Type: Grant
    Filed: October 11, 2019
    Date of Patent: March 16, 2021
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Joon Young Kim, Min Kyu Sung, Jong Hyun Lee, Seung Hyun Cho
  • Patent number: 10931377
    Abstract: A system for data transport in a Distributed Antenna System (DAS) includes a plurality of remote Digital Access Units (DAUs) located at a Remote location. The plurality of remote DAUs are coupled to each other and operable to transport digital signals between the plurality of remote DAUs. The system also includes a plurality of central hubs. Each of the plurality of central hubs is in communication with one of the remote DAUs using an electrical communications path. The system further includes a plurality of transmit/receive cells. Each of the plurality of transmit/receive cells includes a plurality of remote hubs. Each of the remote hubs in one of the plurality of transmit/receive cells is in communication with one of the plurality of central hubs using an optical communications path.
    Type: Grant
    Filed: January 9, 2020
    Date of Patent: February 23, 2021
    Assignee: DALI SYSTEMS CO. LTD.
    Inventors: Shawn Patrick Stapleton, Sasa Trajkovic
  • Patent number: 10601513
    Abstract: Methods, systems, and devices for network communications to reduce optical beat interference (OBI) in upstream communications are described. For example, a fiber node may provide a seed source to injection lock upstream laser diodes. Therefore, upstream communications from each injection locked laser diode may primarily include the wavelength associated with each seed source. The seed sources may be unique to each end device and configured to minimize OBI. That is, the upstream laser diodes may be generic, but the collected seed source may enable upstream communications at varying wavelengths. The end device may provide upstream communications by externally modulating a signal generated by the injection locked laser diode.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: March 24, 2020
    Assignee: Cable Television Laboratories, Inc.
    Inventor: Luis Alberto Campos
  • Patent number: 10419150
    Abstract: In one embodiment, an optical line terminal judges whether the optical network unit operates at a correct uplink wavelength and a correct downlink wavelength during an optical network unit activation progress; and broadcasts a wavelength configuration message if the optical network unit does not operate at the correct uplink wavelength and the correct downlink wavelength to instruct the optical network unit to tune its uplink wavelength and downlink wavelength respectively to the correct uplink wavelength and the correct downlink wavelength.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: September 17, 2019
    Assignee: Alcatel Lucent
    Inventors: Haibo Wen, Shuigen Yang, Fanxiang Bin
  • Patent number: 10361807
    Abstract: An OLT configures combinations of wavelength pairs used for upstream and downstream signals, in a wavelength multiplexing optical communication system which performs single-core bidirectional transmission of a plurality of upstream and downstream signals, in such a way that the maximum value of the chromatic dispersion delay amount calculated from each wavelength pair is less than the maximum value of the chromatic dispersion delay amounts calculated when the combinations of wavelength pairs used for upstream and downstream signals are both allocated from the short wave side.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: July 23, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Katsuhisa Taguchi, Tomoaki Yoshida, Kota Asaka, Shunji Kimura
  • Patent number: 10270890
    Abstract: A wireless station of a wireless network generates a single layer-2 frame containing multiple layer-3 packets in its payload. Each of the multiple layer-3 packets is destined to a corresponding different destination. The wireless station transmits the layer-2 frame to an access point (AP) of the wireless network. The AP receives the layer-2 frame, disassembles the payload into individual layer-3 packets, and transmits each of the individual layer-3 packets separately towards the corresponding destinations. In an embodiment, the wireless network is according to IEEE 802.11 standards, each layer-3 packet is an IP packet, and the layer-2 frame is a MAC frame.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: April 23, 2019
    Assignee: GAINSPAN CORPORATION
    Inventors: Pankaj Vyas, Vishal Batra
  • Patent number: 10263704
    Abstract: An apparatus comprising a signal generator configured to produce a modulation signal, a filter coupled to the signal generator and configured to filter the modulation signal to produce a cancellation signal, and a reflective semiconductor optical amplifier (RSOA) coupled to the signal generator and the filter, wherein the RSOA is configured to generate an optical signal according to a difference between the modulation signal and the cancellation signal and transmit the optical signal towards a partial reflection mirror (PRM).
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: April 16, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventor: Ning Cheng
  • Patent number: 10158930
    Abstract: The communication system has first and second optical systems and an optical feed fiber in communication with the first optical system and arranged to convey a feeder optical signal to the second optical system. The first optical system includes a multiplexer configured to multiplex/demultiplex between a first optical line terminal signal, a second optical line terminal signal, and the feeder optical signal. The feeder optical signal includes the first optical line terminal signal and the second optical line terminal signal. The first optical line terminal signal includes a first upstream free spectral range and a first downstream free spectral range. The second optical line terminal signal includes a second upstream free spectral range and a second downstream free spectral range. The second optical system is in communication with the optical feed fiber and is configured to multiplex and demultiplex between the feeder optical signal and optical network unit signals.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: December 18, 2018
    Assignee: Google LLC
    Inventors: Liang Du, Xiangjun Zhao, Cedric Fung Lam, Daoyi Wang, Changhong Joy Jiang
  • Patent number: 10128973
    Abstract: A method for activating an ONU in a multi-wavelength PON. Other ONUs may be already active and transmit upstream signals to the OLT on various upstream channels. The new ONU transmits an activation signal superimposed to such upstream signals. Since the ONU may include an uncalibrated tunable transmitter, initially the activation signal wavelength might be different from that upon which the ONU shall be activated. The activation signal optical power is lower than the other upstream signals, so as not to impair their reception at the OLT. The OLT operates the ONUs already active on the upstream channel on which the new ONU shall be activated to suspend transmission for one or more time gaps, during which the OLT detects the activation signal. This improves activation signal detection conditions, thereby allowing to increase its bitrate. An acceptable duration of the activation procedure can then be achieved.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: November 13, 2018
    Assignees: TELECOM ITALIA S.p.A., POLITECNICO DI TORINO
    Inventors: Roberto Gaudino, Valter Ferrero, Roberto Mercinelli, Maurizio Valvo
  • Patent number: 10122459
    Abstract: A data communication system comprises an optical transferring device, optical network units, and user processors. The optical transferring device splits a received optical signal into split optical signals. Each optical network unit transforms a respective split optical signal into M first electronic signals, M>1. Each user processor comprises an input mapping unit to map the respective M first electronic signals into N second electronic signals, N?M; an equalization processor to equalize the N second electronic signals and generate a set of N equalized electronic signals; a wave-front demultiplexer to perform a wave-front demultiplexing transform on the N equalized electronic signals, and output N wave-front demultiplexed signals, each of the N wave-front demultiplexed signals being a unique linear combination of the N equalized electronic signals; and an output mapping unit to map the N wave-front demultiplexed signals into at least M third digital electronic data signals.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: November 6, 2018
    Assignee: SPATIAL DIGITAL SYSTEMS, INC.
    Inventor: Donald C. D. Chang
  • Patent number: 10097268
    Abstract: An analog radio over fiber (AROF) wavelength division multiplexing (WDM) system and method for reducing adjacent channel leakage ratio (ACLR) in a radio frequency signal provided by an AROF WDM system are provided. The AROF WDM system comprises a plurality of transmitters, a multiplexer, a demultiplexer, a plurality of receivers and a controller. Each transmitter is for receiving a radio frequency input signal and for modulating the radio frequency input signal onto an optical signal to obtain a modulated optical signal. The multiplexer is for receiving each modulated optical signal from the plurality of transmitters and for combining the modulated optical signals into a combined optical signal to be sent a distance over an optical fiber. The multiplexer has a pluralities of passbands with each passband having a center wavelength. The demultiplexer is for receiving the combined optical signal and for separating the combined optical signal back into the individual modulated optical signals.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: October 9, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Irfan Muhammad Fazal, Robert Leroux
  • Patent number: 10091566
    Abstract: Embodiments of the present invention provide a method and an apparatus for virtualizing a passive optical network, and a passive optical network virtualization system. The method includes: receiving a virtualized passive optical network creation message, where the virtualized passive optical network creation message includes an ID of a to-be-created VPON and at least one wavelength flow identifier ?-flow ID; and establishing, according to the VPON ID and the at least one ?-flow ID, a communication connection relationship with at least one optical network unit in the virtualized passive optical network identified by the VPON ID. According to the method provided by the embodiments of the present invention, on one hand, complex networking performed to deal with different application scenarios is avoided.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: October 2, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Guikai Peng, Huafeng Lin
  • Patent number: 10027405
    Abstract: The present disclosure discloses a method and device for channel switching, an Optical Network Unit (ONU) and a system for Time Wavelength Division Multiplexing (TWDM). The method for channel switching includes that: an ONU acquires channel information of a first TWDM channel, wherein the channel information of the first TWDM channel is used for indicating an uplink wavelength and/or downlink wavelength of the first TWDM channel; and the ONU tunes the uplink wavelength and/or downlink wavelength of the ONU into the uplink wavelength and/or downlink wavelength of the first TWDM channel according to the channel information of the first TWDM channel. By means of the present disclosure, the problem of high cost caused by specially building a standby channel for each TWDM channel in a system for TWDM Passive Optical Network (PON) to provide service protection is solved, and the cost of deploying the TWDM PON system is reduced.
    Type: Grant
    Filed: July 21, 2014
    Date of Patent: July 17, 2018
    Assignee: ZTE CORPORATION
    Inventors: Dan Geng, Weiliang Zhang, Liquan Yuan, Dezhi Zhang
  • Patent number: 9832166
    Abstract: An optical communication system to automatically configure remote optical nodes. The optical communication system comprising a core router configured to transmit a control optical signal at a control transmit wavelength. The optical communication system further comprising one or more remote optical nodes configured to receive the control optical signal at the control transmit wavelength and to transmit an attach request at the control transmit wavelength to the core router. The core router is further configured to receive the attach request and to assign an Internet Protocol (IP) address, a data transmit wavelength, and a mode to the remote optical nodes. The remote optical node are further configured to tune to the assigned data transmit wavelength and operate in the assigned mode.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: November 28, 2017
    Assignee: Sprint Communications Company L.P.
    Inventors: Robert Keith Butler, William Alexander James, Lyle T. Bertz
  • Patent number: 9749600
    Abstract: Systems and methods for optical narrowcasting are provided for transmitting various types of content. Optical narrowcasting content indicative of the presence of additional information along with identifying information may be transmitted. The additional information (which may include meaningful amounts of advertising information, media, or any other content) may also be transmitted as optical narrowcasting content. Elements of an optical narrowcasting system may include optical transmitters and optical receivers which can be configured to be operative at distances ranging from, e.g., 400 meters to 1200 meters. Moreover, the elements can be implemented on a miniaturized scale in conjunction with small, user devices such as smartphones, thereby also realizing optical ad-hoc networking, as well as interoperability with other types of data networks. Optically narrowcast content can be used to augment a real-world experience, enhance and/or spawn new forms of social-media and media content.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: August 29, 2017
    Assignee: SureFire LLC
    Inventors: Narkis E. Shatz, John C. Bortz
  • Patent number: 9739945
    Abstract: A passive optical network includes one or more multi-service terminals each having a housing and a plurality of ruggedized plug-receiving distribution ports accessible from outside the housing. The multi-service terminals also each include an optical power splitter or wave division multiplexer for splitting an optical signal and directing the split signal to the plug-receiving distribution ports. Some of the multi-service terminals provide a different power split ratio from others of the multi-service terminals.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: August 22, 2017
    Assignee: CommScope Technologies LLC
    Inventor: Douglas F. Dowling
  • Patent number: 9729950
    Abstract: The communication system has first and second optical systems and an optical feed fiber in communication with the first optical system and arranged to convey a feeder optical signal to the second optical system. The first optical system includes a multiplexer configured to multiplex/demultiplex between a first optical line terminal signal, a second optical line terminal signal, and the feeder optical signal. The feeder optical signal includes the first optical line terminal signal and the second optical line terminal signal. The first optical line terminal signal includes a first upstream free spectral range and a first downstream free spectral range. The second optical line terminal signal includes a second upstream free spectral range and a second downstream free spectral range. The second optical system is in communication with the optical feed fiber and is configured to multiplex and demultiplex between the feeder optical signal and optical network unit signals.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: August 8, 2017
    Assignee: Google Inc.
    Inventors: Liang Du, Xiangjun Zhao, Cedric Fung Lam, Daoyi Wang, Changhong Joy Jiang
  • Patent number: 9609400
    Abstract: Systems and methods for data transport, including receiving one or more signals into a reconfigurable and flexible rate shared rate multi-transponder network architecture, wherein the network architecture includes one or more transponders with multiple line side interfaces and one or more client side interfaces. The transponders are configured to map one or more signals to multiple parallel Virtual Ethernet Links, remove idle characters from the one or more signals, buffer one or more blocks of characters using an intermediate block buffer, activate and deactivate one or more portions of input/output electrical lanes of an Ethernet module, multiplex and demultiplex the one or more signals to and from the input/output electrical lanes to enable sharing of a single optical transceiver by multiple independent signals, and insert blocks of idle characters to enable transmission over a lower rate transmission pipe.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: March 28, 2017
    Assignee: NEC Corporation
    Inventors: Konstantinos Kanonakis, Junqiang Hu, Ankitkumar Patel, Philip Ji, Ting Wang
  • Patent number: 9559802
    Abstract: An optical network node includes first and second node inputs receiving first and second multiplexed optical signals, respectively. The optical network node includes node outputs, each outputting a separate replicated or demultiplexed optical signal. The optical network node includes a first optical power splitter having a first splitter input connected to the first node input and first splitter outputs connected to the node outputs. The optical network node includes a second optical power splitter having a second splitter input connected to the second node input and second splitter outputs connected to the node outputs. The optical network node includes an arrayed waveguide grating having a grating input connected to the first node input and grating outputs connected to the node outputs, the arrayed waveguide grating demultiplexing the first multiplexed optical signal, when the first multiplexed optical signal is wavelength division multiplexed.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: January 31, 2017
    Assignee: Google Inc.
    Inventors: Pedram Zare Dashti, Liang Du
  • Patent number: 9276676
    Abstract: A visible ray communication system and method that improve transmission rate and remove an influence of inter-color interference to improve the communication quality. A transmission apparatus included in the visible ray communication system allocates each carrier signal component of an OFDM signal, which is modulated into transmission information, to a plurality of LEDs of different colors. The information is added to a combination of a carrier frequency and an LED wavelength, when a carrier signal is allocated to an, in addition to each carrier signal being modulated into the information.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: March 1, 2016
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Atsuya Yokoi
  • Patent number: 9252483
    Abstract: An improved active antenna system is distinguished inter alia by the following features: comprising a first antenna group (5) which is provided for transmitting and receiving operation, comprising a second antenna group (10) which is provided for receiving operation, the two antenna groups (5, 10) are arranged above one another, and the supply network (N11, N12) of the first antenna group (5) has an amplitude distribution which is frequency-dependent, i.e. dependent on a transmitting and a receiving frequency.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: February 2, 2016
    Assignee: KATHREIN-WERKE KG
    Inventors: Maximilian Gottl, Carl Fredrik Lindgren
  • Patent number: 9077527
    Abstract: A data transmission technique where high speed data is transmitted differentially in a forward channel by way of a serial link, and relatively low speed data is differentially modulated onto the forward channel signal for transmission in a reverse channel via the link. By utilizing differential modulation in both forward and reverse channels, the resulting signal has a common mode voltage that is substantially constant, resulting in low EM!. The spectral content of the signal associated with the high speed data may be substantially non-overlapping with the spectral content of the signal associated with the low speed data. This facilitates the recovery of the high speed data and low speed data with minimal interference. The differential signaling lends itself for communicating data via an inexpensive medium, such as twisted wire pair or parallel PCB traces. The data transmission technique applies to various communication network topologies: point-to-point, daisy-chain, and point-to-multiple points.
    Type: Grant
    Filed: January 12, 2012
    Date of Patent: July 7, 2015
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Qiang Wu, Caglar Yilmazer, Mustafa Ertugrul Oner
  • Patent number: 9042729
    Abstract: This invention relates to provisioning wavelength-selective switches and reconfigurable optical add-drop multiplexers to minimize the bandwidth narrowing effect from the optical filters. Novel architectures and methods are disclosed that can significantly reduce bandwidth-narrowing on channels in a reconfigurable WDM network where a large number of optical filter elements are cascaded. Instead of blocking unused channels as in the prior art, unused channels are selectively provisioned depending on the state of their adjacent channels. Unused adjacent channels of an active channel are provisioned to follow the same path as the active channels. As each channels is deployed, the channel frequency is selected so as to minimize bandwidth narrowing.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: May 26, 2015
    Assignee: TREQ LABS, INC.
    Inventors: Chris Wilhelm Barnard, Piotr Myslinski
  • Patent number: 9031409
    Abstract: A headend communications device communicates via a network to downstream network elements, such as cable modems coupled behind optical network units, and allocates and grants timeslots for upstream transmissions from the network elements. The headend communications device has a scheduler for managing and controlling timeslot allocations in a manner avoiding interference such as optical beat interference or FM carrier collisions. The scheduler identifies two or more cable modems or like customer network elements served by the headend communications device that will cause at least a pre-determined intolerable level of interference when allocated overlapping timeslots for upstream transmissions and prevents these two or more cable modems or network elements from being allocated and granted overlapping timeslots.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: May 12, 2015
    Assignee: ARRIS Technology, Inc.
    Inventors: Nagesh S. Nandiraju, Dean A. Stoneback, Amarildo J. C. Vieira
  • Patent number: 9025956
    Abstract: A system for routing signals in a Distributed Antenna System includes a plurality of local Digital Access Units (DAUs) located at a Local location. Each of the plurality of local DAUs is coupled to each other and operable to route signals between the plurality of local DAUs. Each of the plurality of local DAUs includes one or more Base Transceiver Station (BTS) RF connections. Each of the plurality of BTS RF connections is operable to be coupled to one of one or more sectors of a BTS. The system also includes a plurality of remote DAUs located at a Remote location. The plurality of remote DAUs are coupled to each other and operable to transport signals between the plurality of remote DAUs.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: May 5, 2015
    Assignee: Dali Systems Co. Ltd.
    Inventors: Shawn Patrick Stapleton, Sasa Trajkovic
  • Patent number: 9020349
    Abstract: An arrangement at a Remote Node, a Remote Node, a Central Office, a WDM-PON and a method in an arrangement at a Remote Node, and a method in a Central Office are provided for supervision of the WDM-PON. The arrangement comprises at least one filter connected to the feeder fiber links and adapted to separate a data signal and an original OTDR signal received on either of the feeder fiber links. Further, the arrangement comprises a first splitter adapted to receive, from the at least one filter, the original OTDR signal, to split the original OTDR signal into a plurality of OTDR sub-signals and to output, to an N*M AWG, the plurality of OTDR sub-signals. The at least one filter is further adapted to output the original OTDR signal to the first splitter and to output the data signal to the AWG, thereby enabling supervision of the WDM-PON.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: April 28, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Jiajia Chen, Patryk Urban
  • Publication number: 20150098704
    Abstract: The present application provides a wavelength configuration method for a multi-wavelength passive optical network, which includes: scanning, by an ONU, a downstream receiving wavelength, and receiving, downstream wavelength information of each downstream wavelength channel that is broadcast by an OLT separately through each downstream wavelength channel of a multi-wavelength PON system; establishing, by the ONU, a downstream receiving wavelength mapping table, where an entry of the downstream receiving wavelength mapping table includes downstream receiving wavelength information, drive current information of a downstream optical receiver and receiving optical physical parameter information of the ONU; selecting, by the ONU, one downstream wavelength from the downstream wavelength information broadcast by the OLT, and setting, according to the drive current information of the downstream optical receiver recorded in a related entry of the downstream receiving wavelength mapping table, an operating wavelength of
    Type: Application
    Filed: December 13, 2014
    Publication date: April 9, 2015
    Inventors: Bo GAO, Huafeng LIN, Jianhe GAO, Fei YE
  • Patent number: 8989580
    Abstract: The disclosure provides a long-distance box and a method for processing uplink light and downlink light of the long-distance box, uplink light and downlink light from different Passive Optical Network (PON) systems are split, the uplink light from the different PON systems is transmitted through a first optical path, and the downlink light from the different PON systems is transmitted through a second optical path; wherein the uplink light from the different PON systems is amplified by an Optical Amplifier (OA) and then output to Optical Line Terminals (OLT) of respective systems; the downlink light from different PON systems with the different wavelengths is transmitted through different optical sub-paths of the second optical path according to the wavelengths of the downlink light, and the downlink light is amplified by different Optical-Electrical-Optical (OEO) conversion devices on the different optical sub-paths and then output to Optical Network Units (ONUs) of the respective systems.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: March 24, 2015
    Assignee: ZTE Corporation
    Inventors: Jidong Xu, Dezhi Zhang
  • Patent number: 8977132
    Abstract: An RF hardline coaxial cable plant to facilitate voice and/or data services to subscriber premises in one or more neighborhood nodes of a cable communication system by conveying upstream information over an upstream path bandwidth. One or more upstream radio frequency (RF) signals have a carrier frequency of between approximately 5 MHz and 19.6 MHz and are modulated using quadrature amplitude modulation (QAM) with voice and/or data information constituting at least some of the upstream information. An example RF signal defines a channel having an average channel power, and a highest value for an average noise power between 5 MHz and 19.6 MHz in the upstream path bandwidth of a given neighborhood node, as measured over at least a 24 hour period, is at least 25 decibels (dB) below the average channel power and/or less than 20 decibels (dB) above a noise floor associated with the neighborhood node.
    Type: Grant
    Filed: September 23, 2013
    Date of Patent: March 10, 2015
    Assignee: CertusView Technologies, LLC
    Inventors: Steven E. Nielsen, Ronald Totten, Travis Halky
  • Patent number: 8977127
    Abstract: A system comprising a first optical line terminal (OLT) comprising a first integrated optical network unit (ONU), and a first OLT transceiver, and a second OLT coupled to the first OLT, wherein the second OLT comprises a second integrated ONU, and a second OLT transceiver. Included is a first OLT comprising an optical transceiver, at least one processor coupled to the optical transceiver, wherein the processor working in conjunction with the optical transceiver is configured to determine an upstream wavelength corresponding to a second OLT, join, via a first ONU in the first OLT, the second OLT using the upstream wavelength corresponding to the second OLT, and transmit data to the second OLT by the first OLT via the first ONU, wherein the second OLT comprises a second ONU.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: March 10, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Yuanqiu Luo, Bo Gao, Frank Effenberger
  • Publication number: 20150050024
    Abstract: An optical line terminal (OLT) comprises a receiver configured to receive a first message, a processor coupled to the receiver and configured to process the first message, and generate a second message based on the first message, wherein the second message comprises an identification (ID) structure identifying a traffic-bearing entity associated with an optical network unit (ONU), and wherein the ID structure comprises a wavelength ID field, and a transmitter coupled to the processor and configured to transmit the second message.
    Type: Application
    Filed: August 15, 2014
    Publication date: February 19, 2015
    Inventors: Yuanqiu Luo, Frank Effenberger, Bo Gao
  • Publication number: 20150050025
    Abstract: Methods, systems, and computer-readable media can facilitate digitizing a broadcast transmission and transporting the digitized broadcast transmission along with one or more digitized narrowcast transmissions to a subscriber. In embodiments, a digitized broadcast transmission and one or more digitized narrowcast transmissions can be separately demodulated and the transmissions can be combined at one or more receiving nodes. In embodiments, a digitized broadcast transmission can be combined with one or more digitized narrowcast transmissions. Lossless compression and de-compression techniques can be used to optimally transport digitized broadcast and narrowcast signals.
    Type: Application
    Filed: August 18, 2014
    Publication date: February 19, 2015
    Inventors: Marcel F. Schemmann, Zoran Maricevic, Zhijian Sun, Dean Painchaud
  • Patent number: 8958694
    Abstract: One or more overlay wavelengths are applied to a GPON architecture to provide sufficient, cost-effective forward bandwidth per home for targeted, unique narrowcast services to allow traditional HFC operators to use a PON architecture with their existing HFC equipment. A separate return path capability using a separate coaxial cable with RF signals to the GPON may also be used. This return capability may be provided either by a fiber optic link or coaxial link from the home.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: February 17, 2015
    Assignee: General Instrument Corporation
    Inventors: Philip Miguelez, Shawn M. Esser, Fred Slowik
  • Publication number: 20150043915
    Abstract: A method is provided for provisioning time-varying traffic demands in an optical transport software-defined network. The method includes pre-provisioning an amount of bandwidth for best effort traffic. The method further includes iteratively applying, using a processor, an iterative simulated annealing-based traffic provisioning procedure to determine candidate bandwidths for the best effort traffic in a set of iterations. The method also includes selecting a particular candidate bandwidth that has a corresponding blocking value lower than a given blocking requirement ? and that requires a minimum amount of spectrum as compared to other candidate bandwidths. The iteratively applying step includes varying the amount of bandwidth for best effort traffic in each iteration to determine the candidate bandwidths.
    Type: Application
    Filed: July 30, 2014
    Publication date: February 12, 2015
    Inventors: ANKITKUMAR N. PATEL, PHILIP N. JI
  • Patent number: 8953942
    Abstract: A technique for providing time division multiplexing (“TDM”) and wavelength division multiplexing (“WDM”) communication services to customer premises (“CP”) over a passive optical network (“PON”) includes multiplexing a downstream TDM signal with downstream WDM signals onto a fiber trunk line coupled between a central office and a remote node (“RN”), separating the downstream WDM signals from the downstream TDM signal at the RN with a wavelength selective filter, power splitting the downstream TDM signal at the RN onto a plurality of fiber access lines as split TDM signals; and recombining each of the WDM signals with a corresponding one of the split TDM signals onto a corresponding one of the fiber access lines.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: February 10, 2015
    Assignee: Google Inc.
    Inventors: Cedric F. Lam, Ryohei Urata, Hong Liu, Yut Loy Chan
  • Patent number: 8948598
    Abstract: A method for communicating in a passive optical network (PON), includes receiving traffic from a plurality of optical network units (ONUs) transmitting in an upstream transmission channel, wherein each of the ONUs may transmit at any wavelength within a wavelength band associated with the upstream transmission channel. The method also includes dividing the upstream transmission channel into a plurality of sub-channels, that each include a subset of the wavelength band associated with the upstream transmission channel. The method further includes determining the identity of each of the plurality of ONUs transmitting in each of the sub-channels, assigning a plurality of ONUs transmitting in the upstream transmission channel to each of at least two of the sub-channels based on the determination of the ONUs transmitting in that sub-channel, and allocating transmission timeslots for time-shared transmission by the ONUs in one or more of the sub-channels.
    Type: Grant
    Filed: September 18, 2008
    Date of Patent: February 3, 2015
    Assignee: Fujitsu Limited
    Inventor: Martin Bouda
  • Publication number: 20150030332
    Abstract: One or more overlay wavelengths are applied to a GPON architecture to provide sufficient, cost-effective forward bandwidth per home for targeted, unique narrowcast services to allow traditional HFC operators to use a PON architecture with their existing HFC equipment. A separate return path capability using a separate coaxial cable with RF signals to the GPON may also be used. This return capability may be provided either by a fiber optic link or coaxial link from the home.
    Type: Application
    Filed: March 5, 2013
    Publication date: January 29, 2015
    Applicant: General Instrument Corporation
    Inventor: General Instrument Corporation
  • Patent number: 8934771
    Abstract: An optical network has an optical line termination coupled to a backbone network, in particular to an optical long haul network and a local exchange coupled to an optical access network. The local exchange provides an optical connection between an optical network unit of a tree topology and the optical line termination, which is part of a ring topology. There is also described a method for processing data in such an optical network.
    Type: Grant
    Filed: October 16, 2009
    Date of Patent: January 13, 2015
    Assignee: Xieon Networks S.a.r.l.
    Inventor: Sylvia Smolorz
  • Patent number: 8934773
    Abstract: A method for data processing in an optical network includes providing several main wavelengths and processing a subcarrier modulation for the several main wavelengths. An optical network component and a communication system including such an optical network component are also provided.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: January 13, 2015
    Assignee: Xieon Networks S.a.r.l.
    Inventors: Erich Gottwald, Karl Kloppe, Harald Rohde
  • Publication number: 20150010307
    Abstract: The present invention is an optical terminal device comprising a signal modulator configured to generate a first signal modulated onto a first optical sideband of a first optical wavelength signal and a second signal modulated onto a second sideband of the first optical wavelength signal, the first signal being a different type than the second signal; a receiver configured to receive a third signal modulated onto the first optical sideband of a second optical wavelength signal and a fourth signal modulated onto a second sideband of the second optical wavelength signal, the third signal being a different type than the fourth signal; and a circulator coupled to the signal modulator and the receiver, wherein the circulator is configured to communicate with a node of an integrated network via an optical fiber. A remote node, a communication terminal, and a method of performing integrated network access are also disclosed.
    Type: Application
    Filed: September 20, 2012
    Publication date: January 8, 2015
    Inventors: Wende Zhong, Quang Thai Pham
  • Patent number: 8917992
    Abstract: An optical network remote node includes first and second node inputs, each receiving a multiplexed optical signal, and node outputs, each outputting a separate demultiplexed optical signal. The node includes first and second optical power splitters, each having a splitter input connected to one of the node inputs and splitter outputs connected to corresponding node outputs. The node includes an arrayed waveguide grating having first and second grating inputs connected to the first and second node inputs, respectively, and grating outputs connected to the corresponding node outputs. If the received signal at one of the node inputs is time division multiplexed, the corresponding connected optical power splitter broadcasts the received optical signal at the node outputs. If the received signal at one of the node inputs is wavelength division multiplexed, the arrayed waveguide grating demultiplexes the received optical signals in wavelength and outputs the demultiplexed signals at the node outputs.
    Type: Grant
    Filed: January 2, 2013
    Date of Patent: December 23, 2014
    Assignee: Google Inc.
    Inventors: Cedric Fung Lam, Ben Warren Segura, Ryohei Urata, Pedram Zare Dashti, Hong Liu
  • Patent number: 8917991
    Abstract: In fiber-to-the-home (FTTH) RF over Glass (RFoG) Architecture a customer-premise-equipment (CPE) includes a wavelength separator. A method includes up-converting a baseband upstream data signal to a frequency band above a frequency band of a baseband downstream data signal; combining the up-converted upstream data signal with an upstream cable return signal; transmitting the up-converted upstream data signal and the upstream cable return signal using a single upstream laser; and separating, with a wavelength separator, A) a downstream data signal and a downstream cable feed signal from B) the combined up-converted upstream data signal and upstream cable return signal.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: December 23, 2014
    Assignee: Aurora Networks, Inc.
    Inventors: Sudhesh Mysore, Charles Barker, Oleh Sniezko, Krzysztof Pradzynski
  • Patent number: 8903242
    Abstract: The invention relates to a directionless and colorless reconfigurable optical add/drop multiplexer (ROADM) for a number of clients comprising: an add/drop interface for optical signals of at least one optical network, wherein each received optical signal is split by at least one optical splitter into optical signals which are applied to a downstream cross connector distributing the split optical signals to wavelength selectors of different clients, wherein each wavelength selector performs a wavelength selection of at least one wavelength from the distributed optical signals, wherein an optical signal having a selected wavelength (?) is applied to a client transponder of a client.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: December 2, 2014
    Assignee: ADVA Optical Networking, SE
    Inventors: Dogan Atlas, Xiaoping Wu
  • Publication number: 20140348508
    Abstract: The present invention provides a method, terminal and system for fiber network management. A terminal obtains configuration information from a management system and sending an identifier of a configuration port connected to a fiber to an ODN device to allow the ODN device to indicate, according to the configuration port identifier, a corresponding configuration port into which one end of the fiber is inserted. The method includes sending, according to a received first identifier of one end of the fiber and a corresponding configuration port identifier, which are sent by the ODN device, and a second identifier of the other end of the fiber, which is sent by a detecting module, an identifier of a peer configuration port connected to the fiber to the ODN device to allow the ODN device to indicate, according to the received peer configuration port identifier, a corresponding peer configuration port into which the other end of the fiber is inserted.
    Type: Application
    Filed: July 18, 2014
    Publication date: November 27, 2014
    Inventors: Zhenbin Weng, Huaqing Liu, De Li
  • Publication number: 20140341579
    Abstract: An optical line terminal (OLT) in a time and wavelength division multiplexed (TWDM) passive optical network (PON). The OLT comprises a first optical port, a second optical port, and a processor. The first optical port is configured to couple to a plurality of optical network units (ONUs) via an optical distribution network (ODN). The second optical port is configured to couple to the ONUs via the ODN. The processor is coupled to the first optical port and the second optical port and is configured such that, responsive to receiving information indicating that the first optical port has experienced a greater power loss over time than the second optical port, the OLT assigns to the first optical port a first wavelength with a power greater than the power of a second wavelength assigned to the second optical port.
    Type: Application
    Filed: May 15, 2014
    Publication date: November 20, 2014
    Applicant: Futurewei Technologies, Inc.
    Inventors: Frank J. Effenberger, Lei Zong, Dekun Liu
  • Publication number: 20140341578
    Abstract: A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, an AWG may be configured such that optical components of the AWG do not interfere with direct optical coupling, and the wire bonding points on the photodiodes may also be configured such that wire bonding does not interfere with direct optical coupling. The photodetectors may also be mounted on a photodetector mounting bar with a pitch sufficiently spaced to allow connection to floating grounds. A passive alignment technique may be used to determine the mounting locations on the photodetector mounting bar such that the photodetectors are aligned with the optical outputs.
    Type: Application
    Filed: November 25, 2013
    Publication date: November 20, 2014
    Applicant: Applied Optoelectronics, Inc.
    Inventors: I-Lung Ho, Luohan Peng, Joyce Li
  • Patent number: 8886043
    Abstract: The disclosure provides an optical network system, an Optical Line Terminal (OLT), an Optical Network Unit (ONU) and an Optical Distribution Network (ODN) apparatus. The system includes: an OLT configured to modulate and encode at least one line of time-division-multiplexed downlink signals, synthesize the downlink signals encoded into one line and then output it, receive uplink signals, and decode the uplink signals received and then output them; an ODN configured to separate the downlink signals received into multiple lines and then output them, synthesize the uplink signals received into one line, and then output it to the OLT; and ONUs configured to receive the downlink signals output from the ODN, decode the downlink signals received and output them, encode one line of time-division-multiplexed uplink signals, and output the uplink signals encoded to the ODN. Decoding of the downlink signals and encoding of the uplink signals can further be implemented by the ODN.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: November 11, 2014
    Assignee: ZTE Corporation
    Inventors: Biao Chen, Liang Cheng, Dawei Wang, Songlin Zhu, Dan Geng
  • Patent number: 8885618
    Abstract: A wireless communications system including a mobile station MS and base stations BS1 and BS2, wherein one or both of the mobile station MS and the base stations BS1 and BS2 is provided with a unit for notifying information of a frame position with the possibility of transmission of packets based on detection of deterioration of a reception quality and wherein the mobile station MS is provided with a unit for determining a frame position without the possibility of transmission of packets and shifting to a peripheral cell detection mode at this frame position based on information of a frame position with the possibility of transmission of packets, whereby it is possible to shift to a peripheral cell detection mode without lowering the transmission efficiency and without complicating the processing.
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: November 11, 2014
    Assignee: Fujitsu Limited
    Inventors: Tetsuya Yano, Kazuhisa Obuchi, Shunji Miyazaki
  • Patent number: 8879914
    Abstract: A method and apparatus for controlling traffic in an optical network having a plurality of OLTs for communicating with a plurality of PONs. A traffic controller receives traffic information concerning current traffic volume and, preferably with reference to a rules database, calculates the number of OLTs required to support the current traffic volume. A separate determination may be made whether a network reconfiguration is permitted at this time. If a reconfiguration is permitted, the traffic controller configures a traffic control switch to route the PON traffic to an from only the calculated number of OLTs. The traffic control switch may be implemented using a voltage-controlled optical fiber coupling or electronically, routing the traffic as electrical signals to and from electro-optical converters associated with each PON. The OLTs to be used may be selected by the traffic controller.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: November 4, 2014
    Assignee: Alcatel Lucent
    Inventors: Dusan Suvakovic, Doutje Van Veen
  • Patent number: 8879911
    Abstract: There is provided an optical line terminal that dynamically allocates communication bandwidth to a plurality of optical network units in an optical communication network, the optical line terminal including a minimum bandwidth allocation unit calculating allocation bandwidth of the plurality of optical network units based on bandwidth request information notified by the plurality of optical network units, a comparison unit comparing an allocation cycle given as the sum total of allocation bandwidth allocated to the plurality of optical network units respectively with a predetermined threshold value, a best-effort bandwidth allocation unit calculating remaining bandwidth as best-effort bandwidth of the plurality of optical network units when the allocation cycle is less than the threshold value, and a bandwidth allocation unit allocating communication bandwidth of the plurality of optical network units based on the allocation bandwidth and the best-effort bandwidth.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: November 4, 2014
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Hideaki Tamai, Ryuji Hisano