Filter Patents (Class 398/85)
  • Patent number: 11153009
    Abstract: An optical device such as an optical transceiver can include a cascaded built-in self-test structure that can be configured in testing mode using an active power mode and can sufficiently attenuate light away from a loopback path in an inactive power mode. The optical device can include a wafer top emitter that can be used to tune a light source for testing and calibration of optical components while the built-in self-test structure is in active mode.
    Type: Grant
    Filed: July 21, 2020
    Date of Patent: October 19, 2021
    Assignee: Juniper Networks, Inc.
    Inventors: John Parker, John Garcia, Brandon Gomez, Molly Piels, Anand Ramaswamy
  • Patent number: 10969979
    Abstract: In a memory system an interface circuit includes an interface to a memory array, and to a data signal. The circuit includes loopback circuitry to enable loopback of received data signals without having to access the data from the memory array. The circuit can be part of a memory device, a register device, or a data buffer. The circuit interfaces to a memory array of a memory device, and performs loopback functions for a host controller that can test the operation of the interface.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: April 6, 2021
    Assignee: Intel Corporation
    Inventors: Dean-Dexter R. Eugenio, Arvind Kumar, John R. Goles, Christopher E. Cox
  • Patent number: 10911140
    Abstract: In some examples, a multi-wavelength power meter may include a first coupler to separate optical signals from an optical line terminal and an optical network terminal to ascertain a reduced percentage of total power related to the optical signals. A second coupler may receive the separated optical signals, combine the separated optical signals, and output the combined optical signals to an optical fiber. A filter may be communicatively connected to the optical fiber to isolate at least one specified wavelength or wavelength range of the combined optical signals. A photodiode may be communicatively connected to the filter for power measurement of the at least one specified wavelength or wavelength range.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: February 2, 2021
    Assignee: VIAVI SOLUTIONS DEUTSCHLAND GMBH
    Inventors: Joachim Loenne, Wolfgang Moench
  • Patent number: 10763987
    Abstract: A transceiver with multi-wavelength coexistence is disclosed. A BOSA (bi-direction optical sub-assembly), a PCB (203) and a fiber receptacle (102) are disposed within a transceiver housing; the PCB (203) is horizontally arranged in the transceiver housing; the fiber receptacle (102) is disposed on the BOSA; the BOSA comprises multiple transmitters (0004) and multiple receivers (0003) all of which are optically coupled with the fiber receptacle (102) and electrically connected with the PCB (103); two or more BOSAs, which are stacked in parallel or perpendicular to the PCB (203), are disposed in the transceiver housing and respectively connected with an external fiber through multiple fiber receptacles (102).
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: September 1, 2020
    Inventor: Peijuan Chen
  • Patent number: 10693564
    Abstract: An apparatus for performing interference cancellation is disclosed, comprising: a first electro-optic (EO) modulator configured to modulate a received RF signal onto a first optical carrier signal to generate a first modulated signal; a plurality of base signal sources configured to generate a plurality of base signals; an optical combiner coupled to the plurality of base signal sources, the optical combiner being configured to combine the base signals into a second optical carrier signal; a second EO modulator configured to modulate a reference signal onto the second optical carrier signal to generate a second modulated signal; and a subtraction element that is coupled to the first EO modulator and the refractive element, the subtraction element being configured to subtract the tapped delay line signal from the first modulated signal to generate an output signal.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: June 23, 2020
    Assignee: Raytheon Company
    Inventors: John P. Gianvittorio, Larry C. Martin
  • Patent number: 10637603
    Abstract: In an example, a communication module includes an optical transmitter, an optical receiver, and a periodical filter. The optical transmitter is configured to emit an outbound optical signal. The optical receiver is configured to receive an inbound optical signal. A first frequency of the outbound optical signal is offset from a second frequency of the inbound optical signal by an amount less than a channel spacing of a multiplexer/demultiplexer implemented in an optical communication system that includes the communication module. The periodical filter is positioned in optical paths of both the outbound optical signal and the inbound optical signal and has a transmission spectrum with periodic transmission peaks and troughs. The first frequency of the outbound optical signal may be aligned to one of the transmission peaks and the second frequency of the inbound optical signal may be aligned to one of the transmission troughs, or vice versa.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: April 28, 2020
    Assignee: Finisar Corporation
    Inventors: Leo Yu-Yu Lin, Huade Shu, Huiping Li, Li Zhang, Shanshan Zeng, Guangsheng Li
  • Patent number: 9958612
    Abstract: In order to prevent a signal which a terminal station does not require from being intercepted by the terminal station without greatly changing the power of optical signals to be transmitted from a node to the terminal station, a node device is provided with: a first optical unit which outputs a first optical signal received from a first terminal station and addressed to a second terminal station, and a second optical signal received from the first terminal station, addressed to a third terminal station, and having a different wavelength band from the first optical signal; and a second optical unit to which the first and second optical signals outputted from the first optical unit are inputted, and which shifts the frequency of the first optical signal by a predetermined amount to create a fourth optical signal, passes the second optical signal without any change, couples the second and fourth optical signals, and transmits a resultant signal to the third terminal station.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: May 1, 2018
    Assignee: NEC Corporation
    Inventor: Satoshi Mikami
  • Patent number: 9929827
    Abstract: This application provides a wavelength negotiation method of a multi-wavelength passive optical network, including: receiving a wavelength status table that is broadcast by an OLT over each downstream wavelength channel of a multi-wavelength PON system, where the wavelength status table is used to indicate information about available wavelengths of the multi-wavelength PON system and statistic information of registered ONUs of a corresponding wavelength channel; selecting an upstream transmit wavelength and a downstream receive wavelength according to the wavelength status table; and reporting information about the upstream transmit wavelength and information about the downstream receive wavelength to the OLT so that the OLT refreshes the wavelength status table. This application also provides a wavelength negotiation apparatus of the multi-wavelength passive optical network and a multi-wavelength passive optical network system.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: March 27, 2018
    Assignee: Huawei Technologies Co., Ltd
    Inventors: Bo Gao, Jianhe Gao
  • Patent number: 9904144
    Abstract: Disclosed is an ultrafast optical switching device based on black phosphorus, including a first channel to generate a first laser which is a continuous wave of a first wavelength, a second channel to generate a second laser which is a continuous wave of a second wavelength different from the first wavelength, a modulator to modulate the second laser generated by the second channel into a pump signal, a first and a second wavelength tunable filters to change wavelengths of the first laser and the second laser, respectively, a directional coupler to couple the first laser and the second laser, and an optical element to control the first and second lasers coupled by the directional coupler by means of nonlinearity and an evanescent field of black phosphorus. Accordingly, volume and size of an ultrafast optical switching device may be reduced, and a data processing rate may be improved.
    Type: Grant
    Filed: April 14, 2017
    Date of Patent: February 27, 2018
    Assignee: Korea Institute of Science and Technology
    Inventors: Yong-Won Song, Md. Siam Uddin
  • Patent number: 9848254
    Abstract: A content delivery network (CDN) includes: at least one CDN origin node; and multiple CDN cache nodes connected to the at least one CDN origin node via an optical transport network (OTN). Deliveries and/or routing from the multiple CDN cache nodes to the at least one CDN origin node and/or vice versa is performed below layer 3 of the Open Systems Interconnection (OSI) model.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: December 19, 2017
    Assignee: DEUTSCHE TELEKOM AG
    Inventors: Ralf-Peter Braun, Michael Dueser, Thomas Monath
  • Patent number: 9548834
    Abstract: A colorless, directionless ROADM includes a pair of contentioned add and drop wavelength-selective optical switches, an input wavelength-selective optical switch having one input port, and an output wavelength-selective optical switch having one output port. Unintended input-to-output port couplings, which appear in the “contentioned” add and drop switches, can be mitigated by the input and output wavelength-selective optical switches carrying the through traffic.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: January 17, 2017
    Assignee: Lumentum Operations LLC
    Inventors: Peter David Roorda, Sheldon McLaughlin
  • Patent number: 9363021
    Abstract: A receiver optical module to facilitate the assembling is disclosed. The receiver optical module includes an intermediate assembly including the optical de-multiplexer and the optical reflector each mounted on the upper base, and the lens and the PD mounted on the sub-mount. The latter assembly is mounted on the bottom of the housing; while, the former assembly is also mounted on the bottom through the lower base. The upper base is apart from the bottom and extends in parallel to the bottom to form a surplus space where the amplifying circuit is mounted.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: June 7, 2016
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yasushi Fujimura, Fumihiro Nakajima
  • Patent number: 9337938
    Abstract: A signal processing method, an optical receiver and optical network system is provided. The method includes: receiving a first optical signal sent by an optical network unit, generating a second optical signal and modulating a phase of the second optical signal, obtaining at least one path of electrical signals after the first optical signal and the second optical signal separately undergo polarization splitting, frequency mixing, and optical-electrical conversion, outputting a third electrical signal after performing operation processing on the at least one path of electrical signals, and restoring a data signal according to the third electrical signal and performing sending. The embodiments example benefits are greatly reducing complexity of system implementation and maximally reducing a system upgrade cost and an optical power loss.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: May 10, 2016
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Lei Zhou, Zhenxing Liao, Zhenping Wang, Ning Cheng
  • Patent number: 9323065
    Abstract: Known semiconductor wafer process technologies are used to manufacture an optical MUX/DeMUX with very precise dimensional control. The manufacturing process eliminates the need to polish optical surfaces of the MUX/DeMUX, which reduces the overall manufacturing costs and the amount of time that is required to manufacture the MUX/DeMUX.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: April 26, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Tak Kui Wang, Ye Chen, Frank Yashar
  • Patent number: 9154258
    Abstract: Systems and methods are disclosed including a subsea link idler apparatus comprising at least one data laser generating a first laser beam as a data signal, having a first frequency within a first data channel bandwidth slot; a first continuous wave laser generating a second laser beam with a first polarization and a second frequency being within a second data channel bandwidth slot; a second continuous wave laser generating a third laser beam with a second polarization different from the first polarization and a third frequency being offset from the second frequency and being within the second data channel bandwidth slot; a polarization beam combiner positioned in paths of the second and third laser beams combining the second and third laser beams into an idler signal; and a transmitter receiving and transmitting the data signal and idler signal.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: October 6, 2015
    Assignee: Infinera Corporation
    Inventors: Pierre Mertz, Hai Xu
  • Patent number: 9136971
    Abstract: A method configuring an optical transmission interface of at least one first device transmitting optical signals on a path to a second device on a carrier wavelength substantially equal to a nominal wavelength of an optical band-pass filter present on the path, each first device including an optical reception interface to enable receiving optical signals from the second device, the second device including an optical reception interface to enable receiving optical signals output by the first optical band-pass filter and transmitted by any first device on a carrier wavelength substantially equal to the nominal wavelength, the optical transmission interface of each first device being initially configured for transmitting optical signals on a first carrier wavelength.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: September 15, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Gwillerm Froc, Christophe Mangin
  • Patent number: 9020351
    Abstract: An optical waveguide can transmit multiple optical signals imprinted or encoded with different information, thereby increasing the waveguide's information carrying capability or bandwidth. Each optical signal can comprise multiple longitudinal modes that are energized and that are modulated substantially in unison. Thus, the photonic energy of each optical signal can be spread across a wavelength region in a substantially discrete or substantially discontinuous pattern. The respective wavelength regions of the optical signals can overlap or substantially overlay one another. Modes of one of the optical signals can be substantially interleaved, interspersed, or intermingled with modes of other optical signals. Systems at ends of the optical waveguide can feed the optical signals onto and off of the optical waveguide and discriminate the optical signals from one another. The systems can comprise ring resonators. The waveguide can support an on-chip network, such as for a multicore processor of a computer.
    Type: Grant
    Filed: December 16, 2013
    Date of Patent: April 28, 2015
    Assignee: Cirrex Systems, LLC
    Inventor: Michael L. Wach
  • Publication number: 20150086206
    Abstract: A fiber optic sensing system. The fiber optic sensing system includes an optical source adapted to provide an optical signal at a plurality of wavelengths. The fiber optic sensing system also includes a plurality of wavelength taps for separating the optical signal into signal portions at each of the plurality of wavelengths. The fiber optic sensing system further includes a plurality of optical sensors, each of the optical sensors configured to receive one of the signal portions at a respective one of the plurality of wavelengths. The fiber optic sensing system still further includes a plurality of wavelength combiners for combining signal portions from the plurality of optical sensors into a recombined signal. Also included in the fiber optic sensing system is an optical receiver for receiving the recombined signal. The fiber optic sensing system also includes an optical fiber path between the optical source and the optical receiver.
    Type: Application
    Filed: May 3, 2013
    Publication date: March 26, 2015
    Inventors: Eric Lee Goldner, Agop Hygasov Cherbettchian, Eric Udd, Sophie Pierrette Laut
  • Patent number: 8989597
    Abstract: A collimator for a laser assembly includes a first electrostatically controllable liquid lense having a first optical axis and a second electrostatically controllable liquid lense having a second optical axis aligned with the first optical axis. A laser is provided and has such a collimator. Finally, a transmitter uses the laser for optical data transmission.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: March 24, 2015
    Assignee: Xieon Networks S.a.r.l.
    Inventors: Thomas Treyer, Sylvia Smolorz
  • Patent number: 8985869
    Abstract: Designs of pluggable optical passive devices are described. Such a pluggable optical passive device can be inserted into an existing configuration. According to one embodiment, the pluggable optical passive device is formed as an elongated enclosure with one or two first connectors on one side thereof and one or two second connectors on the other side thereof. The first connectors are provided to be coupled to female pluggers while the second connectors are provided to be coupled to male pluggers. Depending on implementation, the first and second connectors may be glued onto or skewed into the enclosure through holes, and may be further extended by a flexible pigtailed dual LC connector.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: March 24, 2015
    Assignee: Alliance Fiber Optic Products, Inc.
    Inventors: Bruce Peng, Charlie Xiao, Yao Li
  • Patent number: 8977130
    Abstract: There is provided an optical transmission device, the optical transmission device including a wavelength selective switch configured to select a first optical signal having a first wavelength from an input signal of wavelength division multiplexing, an optical filter circuit configured to include an optical tunable filter having a pass wavelength that is tunable to a second wavelength of a second optical signal for passing therethrough, a splitter configured to split the input signal, a split signal split by the splitter being transferred to the optical filter circuit, and a coupler configured to couple the first optical signal selected by the wavelength selective switch and the second optical signal passed through the optical filter circuit.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: March 10, 2015
    Assignee: Fujitsu Limited
    Inventors: Koji Takeguchi, Kazuo Takatsu
  • Patent number: 8958695
    Abstract: An optical adding and dropping device includes a drop section including an input port and having a through port and a plurality of drop ports set as output ports, a first multiplexer adapted to multiplex light from the through port and light from a plurality of add ports, and a spectrum foot removing section provided on the input side of the first multiplexer and adapted to remove a foot of a spectrum of light to be inputted from the add ports to the first multiplexer. The optical adding and dropping device can be configured at a low cost while it has adding and dropping functions.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: February 17, 2015
    Assignee: Fujitsu Limited
    Inventors: Hiroki Ooi, Takafumi Terahara, Kentaro Nakamura, Chihiro Ohshima, Tsuyoshi Yamamoto
  • Patent number: 8942563
    Abstract: A wavelength tunable device for use in a wavelength division multiplexing (WDM) system comprising a display device for displaying at least one operating wavelength of the wavelength tunable device. The display device is electrically coupled to a control unit in the wavelength tunable device so as to display the tuned wavelength in real time. The wavelength tunable device may be, in exemplary embodiments, an optical transponder, wavelength division demultiplexer, or wavelength division multiplexer. In embodiments where the optical equipment has a plurality of tunable ports, the display device is adapted to display the operating wavelength of each tunable port.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: January 27, 2015
    Assignee: AT&T Intellectual Property II, L.P.
    Inventor: Guodong Zhang
  • Patent number: 8929738
    Abstract: Embodiments herein include a resilient add-drop module for use in one of multiple access subnetwork nodes forming an access subnetwork ring. The module comprises a dual-arm passive optical filter and a cyclic arrayed waveguide grating (AWG). The dual-arm passive optical filter is configured to resiliently drop any wavelength channels within a fixed band uniquely allocated to the access subnetwork node from either arm of the access subnetwork ring and to resiliently add any wavelength channels within the fixed band to both arms of the access subnetwork ring. The cyclic AWG is correspondingly configured to demultiplex wavelength channels dropped by the dual-arm filter and to multiplex wavelength channels to be added by the dual-arm filter. Configured in this way, the module in at least some embodiments advantageously reduces the complexity and accompanying cost of nodes in an optical network, while also providing resilience against fiber and node failures.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: January 6, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Stefan Dahlfort, Ming Xia
  • Patent number: 8923700
    Abstract: An optical device includes an optical splitter having an input port, a first output port and a second output port and is adapted to receive at said input port a WDM optical signal including a plurality of channels equally spaced by a frequency spacing and occupying an optical bandwidth, and wherein the optical splitter is adapted to output at the first and second output ports, respectively, a first and a second portion of the optical signal; an optical combiner having a respective first and second input ports and a respective output port; a first optical path optically connecting the first output port of the optical splitter to the first input port of the optical combiner; a second optical path optically connecting the second output port of the optical splitter to the second input port of the optical combiner, a first optical filter optically coupled along the first optical path, and a second optical filter optically coupled to the second optical path and the free spectral range of both the first and the seco
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: December 30, 2014
    Assignee: Google Inc.
    Inventors: Luciano Socci, Paola Galli, Silvia Ghidini, Marco Romagnoli
  • Patent number: 8913891
    Abstract: A method and a Reconfigurable Optical Add Drop Multiplexer (ROADM) where blocking of a first optical signal carried over a specific optical channel in the ROADM is performed by compensating the first optical signal by a second optical signal created for that purpose.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: December 16, 2014
    Assignee: ECI Telecom Ltd.
    Inventors: Amitay Melamed, Shai Stein
  • Patent number: 8897646
    Abstract: An optical add/drop multiplexer including one or more optical drop multiplexers connected in free space or fused by optical fiber pigtails, a wavelength blocker with an input port connected to an output port of the optical drop multiplexer through the fusion of the fiber pigtails, one or more optical add multiplexers connected in free space or fused by fiber pigtails, a digital signal processor, an analog-to-digital signal converter, a digital-to-analog converter, and a plurality of electronic control and feedback loops for tuning and scanning an optical wavelength.
    Type: Grant
    Filed: September 29, 2012
    Date of Patent: November 25, 2014
    Assignee: GP Photonics, Inc.
    Inventor: Peiliang Gao
  • Publication number: 20140341583
    Abstract: A reconfigurable optical device including input and output ports, and add or drop ports, has a high degree of flexibility such that any wavelength channel from any optical signal introduced through the add ports may be added to any of the optical signals transmitted through the output ports. In addition, any wavelength channel from any optical signal received through the inputs ports may be dropped through any of the drop ports. Furthermore, the optical device is configurable to allow the same wavelength channel from two different optical signals supplied respectively through any two inputs ports to be simultaneously directed to two different drop ports.
    Type: Application
    Filed: August 4, 2014
    Publication date: November 20, 2014
    Inventors: Ming Wu, Peter G. Wigley
  • Patent number: 8873961
    Abstract: An optical de-multiplexer (de-MUX) that includes an optical device that images and diffracts an optical signal using a reflective geometry is described, where a free spectral range (FSR) of the optical device associated with a given diffraction order abuts FSRs associated with adjacent diffraction orders. Moreover, the channel spacings within diffraction orders and between adjacent diffraction orders are equal to the predefined channel spacing associated with the optical signal. As a consequence, the optical device has a comb-filter output spectrum, which reduces a tuning energy of the optical device by eliminating spectral gaps between diffraction orders of the optical device.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: October 28, 2014
    Assignee: Oracle International Corporation
    Inventors: Ying Luo, Xuezhe Zheng, Guoliang Li, Kannan Raj, Ashok V. Krishnamoorthy
  • Patent number: 8867916
    Abstract: In order to achieve a higher spectral efficiency of OFDM sub-bands, optical signals using orthogonal frequency division multiplexing are transmitted through an optical network in the form of a continuous waveband optical signal. An optical add/drop multiplexer (1) splits the continuous waveband optical signal into an express path and a drop path. A band pass filter (4) is provided in the drop path to extract a sub-band carrying at least one of said OFDM modulated optical signals (DROP). The band pass filter (4) has a filter bandwidth that covers the sub-band to be extracted. A band-stop filter (3) is provided in the express path to remove the sub-band to be extracted from the continuous waveband optical signal (IN). The band stop filter (3) has a filter bandwidth which is narrower than the band pass filter (4). An OFDM modulated optical add signal (ADD) can be added into the wavelength gap created through the band stop filter (3).
    Type: Grant
    Filed: October 6, 2010
    Date of Patent: October 21, 2014
    Assignee: Alcatel Lucent
    Inventors: Fred Buchali, Roman Dischler
  • Patent number: 8867920
    Abstract: An electro-optical device includes an optical de-multiplexing portion operative to output a first optical signal having a first wavelength and a second optical signal having a second wavelength, an array of photodetectors, and a switching logic portion communicatively connected to the array of photodetectors, the switching logic portion operative to determine which photodetector of the array of photodetectors is converting the first optical signal into a first electrical signal and output the first electrical signal from a first output node associated with the first optical signal.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: October 21, 2014
    Assignee: International Business Machines Corporation
    Inventors: Solomon Assefa, Douglas M. Gill, Jonathan E. Proesel, Alexander V. Rylyakov, Clint L. Schow
  • Patent number: 8861965
    Abstract: There is provided an optical transmission apparatus including: a transmitter to output an optical signal to be transferred to other optical transmission apparatus; a first dummy light source to generate first dummy light having a wavelength which is not included in an optical signal received from other optical transmission apparatus; a first wavelength-multiplexer to wavelength-multiplex the optical signal received from other optical transmission apparatus, the optical signal output from the transmitter, and an optical signal with a wavelength, of the first dummy light, which is not included in the optical signal received from other optical transmission apparatus and in the optical signal output from the transmitter; and an optical amplifier to amplify an optical signal multiplexed by the first wavelength-multiplexer.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: October 14, 2014
    Assignee: Fujitsu Limited
    Inventors: Kentaro Nakamura, Norifumi Shukunami, Tatsuya Tsuzuki
  • Patent number: 8837948
    Abstract: In the method for processing a signal light from free-space by amplifying said signal for free-space optical communications, wherein the improvement includes the steps of (a) pre-amplifying said signal light with low noise; and (b) coupling said signal light into a multimode filter which reduces coupling losses compared to single mode filters.
    Type: Grant
    Filed: June 24, 2010
    Date of Patent: September 16, 2014
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Robert T. Carlson, Daniel J. Creeden
  • Publication number: 20140226987
    Abstract: The invention relates to a protected optical single-fiber WDM system. A first (3) and a second (5) head-end terminal and at least one optical add/drop filter device (11) are connected to form a chain-like transmission path, each of the first and second head-end terminals (3, 5) being connected, at a WDM port (3a, 5a), through a single optical fiber (13) to a western (11a) or an eastern WDM port (11d) of an adjacent one of the optical add/drop filter devices (11), respectively, and each of the optical add/drop filter devices (11) being connected, at an eastern or western WDM port (11d, 11a), to a western or eastern WDM port (11a, 11d) of an adjacent one of the optical add/drop filter devices (11), respectively.
    Type: Application
    Filed: February 13, 2014
    Publication date: August 14, 2014
    Inventors: Michael Eiselt, Klaus Grobe, Jörg-Peter Elbers
  • Patent number: 8781331
    Abstract: The invention relates to a method for operating a controllable selective optical add/drop channel for a fiber-optic communication system provided with 2N of wavelength-division multiplexing channels, whose optical frequencies are returnable at a constant frequency separations ?v between adjacent channels, with the aid of the inventive controllable optical add/drop multiplexers (70, 80, 90) that comprise multi-stage structures of optical filters ({75-i}, {85-i}, {95-i}), that are connected in a different manner and provided with devices, for example electro-optical and thermo-optical phase shift devices, for controllable tuning the transmissions characteristics thereof. The optical filters are embodied in the form of single-stage (20), two-stage (40) and/or multi-stage (60) asymmetric Mach-Zehnder interferometers. The controllable optical add/drop multiplexer can be produced according to integrated optic technique in the form of monolithic solid-state device.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: July 15, 2014
    Assignees: Federal State Budgetary Institution Federal Agency for Legal Protection of Military, Special and Dual Use Intellectual Activity Results, Zakritoe Aktzionernoe Obschestvo ‘TSENTR’ ‘VOSPI’ (VOSPI Center CJSC (Closed Stock Company))
    Inventor: Vyacheslav Konstantinovich Sakharov
  • Patent number: 8755691
    Abstract: A wavelength tunable device for use in a wavelength division multiplexing (WDM) system comprising a display device for displaying at least one operating wavelength of the wavelength tunable device. The display device is electrically coupled to a control unit in the wavelength tunable device so as to display the tuned wavelength in real time. The wavelength tunable device may be, in exemplary embodiments, an optical transponder, wavelength division demultiplexer, or wavelength division multiplexer. In embodiments where the optical equipment has a plurality of tunable ports, the display device is adapted to display the operating wavelength of each tunable port.
    Type: Grant
    Filed: July 17, 2009
    Date of Patent: June 17, 2014
    Assignee: AT&T Intellectual Property II, L.P.
    Inventor: Guodong Zhang
  • Patent number: 8706784
    Abstract: A time domain filter receives a double sideband (DSB) input in the frequency domain and compresses this input into a time domain signal filtered by a time gate for providing a time filtered signal that is then expanded back into the frequency domain as a single sideband (SSB) output with one sideband being filtered by the time gate for translating DSB signals into SSB signals well suited for communicating chirped modulated signals as SSB signals along an electrical line or optical fiber without dispersive nulling of the communicated signal.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: April 22, 2014
    Assignee: The Aerospace Corporation
    Inventors: Jason T. Chou, Todd S. Rose, Joshua A. Conway
  • Patent number: 8699884
    Abstract: An optical transmission system includes a plurality of optical nodes that transmits wavelength multiplexing light including a plurality of signal light components having different wavelengths, wherein each of the optical nodes includes superimposed signal light generation circuit which superimposes a low frequency signal having a common frequency on a corresponding signal light component included in the wavelength multiplexing light; low frequency signal extraction circuit which extracts a low frequency signal having a frequency of a given range from a corresponding signal light component; and pass-through node number measurement circuit which measures, for each of the signal light components, a pass-through node number based on the frequency of the low frequency signal extracted by the low frequency signal extraction circuit, the pass-through node number being the number of optical nodes through which the signal light component has passed before being transmitted to a specific optical node.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: April 15, 2014
    Assignee: Fujitsu Limited
    Inventors: Takashi Toyomaki, Motoyoshi Sekiya
  • Patent number: 8693896
    Abstract: A method for processing received electromagnetic radiation includes receiving electromagnetic radiation having a plurality of carrier waves in the frequency range between 0.1 and 10 terahertz and having modulated onto the carrier waves information with a signal frequency of less than 50 GHz. The received radiation is filtered with a filter that is tunable in the frequency range from 0.1 to 10 terahertz so as to obtain at least one carrier wave as a terahertz signal. The terahertz signal is provided to a detection circuit that is sensitive to the terahertz signal frequency.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: April 8, 2014
    Assignee: Deutsche Telekom AG
    Inventors: Ingo Breunig, Karsten Buse, Jens Kiessling, Bastian Knabe, Rosita Sowade
  • Patent number: 8693873
    Abstract: The present disclosure describes a reconfigurable optical add-drop multiplexer. The reconfigurable optical add-drop multiplexer includes a first optical equalizer to precompensate a received optical signal for optical filtering effects to produce a first compensated optical signal. A first interleaver, coupled to the first optical equalizer, separates the first compensated optical signal into an odd optical signal and an even optical signal. A plurality of wavelength selective switches processes the odd optical signal and the even optical signal. A second interleaver, combines the odd optical signal and the even optical signal to produce a combined optical signal. A second optical equalizer, coupled to the second interleaver, postcompensates the combined optical signal for optical filtering effects to produce an output optical signal.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: April 8, 2014
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: Xiang Zhou
  • Publication number: 20140072301
    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: Application
    Filed: March 12, 2013
    Publication date: March 13, 2014
    Applicant: VELLO SYSTEMS, INC.
    Inventors: Chris Wilhelm Barnard, Piotr Myslinski
  • Patent number: 8670670
    Abstract: An optical ring network architecture including a number (N) of multi-add/drop filters, such as filters formed using pairs of frequency routers. Each multi-add/drop filter is coupled to two other multi-add/drop filters using N-2 transmission media, such as optical fibers, to form a ring. The network includes a number (N) of terminal stations associated with the multi-add/drop filters. A terminal station (p) is coupled with, and receives information from, its associated multi-add/drop filter (p) through a single optical fiber. The terminal station p is coupled with, and transmits information in a first direction around the ring to, a multi-add/drop filter p+1 through a single optical fiber. Communications from terminal station p to each other terminal station in the first direction are assigned one of N-1 wavelengths where no two wavelengths on a given optical fiber are associated with communications between terminal stations in the same direction.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: March 11, 2014
    Assignee: AT&T Intellectual Property II, L.P.
    Inventor: Bernard Glance
  • Patent number: 8660429
    Abstract: A telecommunications module includes an optical wavelength division multiplexer/demultiplexer configured to demultiplex a first optical signal input into the telecommunications module into a plurality of different wavelengths, a fiber optic splitter configured to split a second optical signal input into the telecommunication module into a plurality of optical signals, and a plurality of optical add/drop filters, each of the optical add/drop filters configured to combine one of the optical signals that has been split by the fiber optic splitter and one of the wavelengths that has been demultiplexed by the optical wavelength division multiplexer/demultiplexer into a combination output signal that is output from the telecommunications module.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: February 25, 2014
    Assignee: ADC Telecommunications, Inc.
    Inventors: Kristofer Bolster, John Pfarr
  • Patent number: 8639120
    Abstract: A system is provided for electrical domain optical spectrum shaping. The system may include a laser, a modulator, a first electrical filter, and a second electrical filter. The laser may be configured to output an optical carrier signal. The modulator may be configured to modulate the optical carrier signal to output a modulated optical signal based on a first filtered input signal and a second filtered input signal received by the modulator. The first electrical filter may be configured to filter a first input signal to produce the first filtered input signal. The second electrical filter may be configured to filter a second input signal to produce the second filtered input signal.
    Type: Grant
    Filed: January 20, 2010
    Date of Patent: January 28, 2014
    Assignee: Fujitsu Limited
    Inventors: Inwoong Kim, Paparao Palacharla, Takao Naito
  • Patent number: 8630538
    Abstract: A communication system includes a transmitter that combines and transmits a first signal light and a dummy light having a wavelength different from the first signal light; a first amplifier that amplifies a light transmitted by the transmitter to a constant power; a communication device that separates the dummy light from the light amplified by the first amplifier, has a variable transmittance and allows the separated dummy light to pass through, and combines and transmits the passed dummy light and a second signal light having a wavelength different from the dummy light; a second amplifier that amplifies a light transmitted by the communication device to a constant power; a receiver that receives the second signal light included in the light amplified by the second amplifier; and a controller that controls the transmittance.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: January 14, 2014
    Assignee: Fujitsu Limited
    Inventors: Makoto Nashimoto, Kenji Ota
  • Patent number: 8611749
    Abstract: A reconfigurable optical switching device comprising a Tunable Filters Array (TFA) unit incorporating tunable optical filters, wherein the arrangement is such that one and the same TFA unit is utilized both for performing a drop function of the device in a colorless and reconfigurable manner, and a through function of the device in a reconfigurable manner.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: December 17, 2013
    Assignee: ECI Telecom Ltd.
    Inventors: Avi Levy, Eyal Lichtman
  • Patent number: 8611759
    Abstract: An optical domain spectrum analyzer/channelizer employs multicasting of an analog signal onto a wavelength division multiplexing grid, followed by spectral slicing using a periodic optical domain filter. This technique allows for a large number of high resolution channels. Wideband, 100% duty cycle, spectrum analysis or channelization is made possible permitting continuous time wideband spectral monitoring. The instantaneous bandwidth of the spectrum analyzer/channelizer is equal to the full radio frequency bandwidth of the analyzer/channelizer.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: December 17, 2013
    Assignee: The United States of America as Represented by the Secretary of the Navy
    Inventors: Joshua M. Kvavle, James R Adleman, Christopher K. Huynh, Camille-Sophie Bres, Sanja Zlatanovic, Andreas Olof Johan Wiberg, Ping Piu Kuo, Evgeny Myslivets, Everett William Jacobs, Stojan Radic
  • Patent number: 8611747
    Abstract: An optical waveguide can transmit multiple optical signals imprinted or encoded with different information, thereby increasing the waveguide's information carrying capability or bandwidth. Each optical signal can comprise multiple longitudinal modes that are energized and that are modulated substantially in unison. Thus, the photonic energy of each optical signal can be spread across a wavelength region in a substantially discrete or substantially discontinuous pattern. The respective wavelength regions of the optical signals can overlap or substantially overlay one another. Modes of one of the optical signals can be substantially interleaved, interspersed, or intermingled with modes of other optical signals. Systems at ends of the optical waveguide can feed the optical signals onto and off of the optical waveguide and discriminate the optical signals from one another. The systems can comprise ring resonators. The waveguide can support an on-chip network, such as for a multicore processor of a computer.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: December 17, 2013
    Assignee: Cirrex Systems, LLC
    Inventor: Michael L. Wach
  • Patent number: 8600236
    Abstract: An optical communication module for optical wavelength division multiplexing includes a plurality of light devices emitting or receiving light beams having different wavelengths, a single optical fiber, and an optical elements arranged between the plurality of light devices and the single optical fiber and having a plurality of lens areas to converge a light beam starting from a single point at a plurality of points or light beams starting from a plurality of points at a single point. In the optical communication module, the plurality of lens areas are arranged such that the center points of the plurality of lens areas are located at the same distance from a point, and the single point and the plurality of points are located at the opposite sides with respect to the optical element.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: December 3, 2013
    Assignee: Opticis. Co., Ltd.
    Inventors: Hyun Ee Shin, Hee Dae Kim, Won Seok Jung, Ii Kim, Hyun Kuk Shin
  • Patent number: RE45193
    Abstract: An apparatus and method for extracting an optical clock signal are provided. The apparatus includes a first reflection filter selecting and reflecting only a first frequency component in an input optical signal; a first Fabry-Perot laser diode matching the first frequency component reflected by the first reflection filter with a predetermined output mode and outputting the first frequency component in the predetermined output mode; a second Fabry-Perot laser diode selecting a second frequency component in an input optical signal that has not been reflected but has been transmitted by the first reflection filter, matching the second frequency component with a predetermined output mode, and outputting the second frequency component in the predetermined output mode; and a photodetector receiving the first frequency component from the first Fabry-Perot laser diode and the second frequency component from the second Fabry-Perot laser diode and beating them to extract a clock signal.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: October 14, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jaemyoung Lee, Je Soo Ko