Receiver Patents (Class 398/24)
  • Patent number: 9031415
    Abstract: An Ethernet adapter system may include a transmitter to insert a payload type identifier sequence in a generic frame procedure header to indicate that a network is a converged enhanced Ethernet network. The transmitter may insert idle sequences in a stream of data frames transmitted along a link. The system may include a receiver to recognize a condition and to force a loss of synchronization condition on the link that will be converted by the receiver into a loss of light condition. The receiver may scan the transmitted stream of data frames for invalid data frames and introduce a code into the stream of data frames whenever an invalid data frame is detected.
    Type: Grant
    Filed: December 8, 2012
    Date of Patent: May 12, 2015
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Thomas A. Gregg, Rajaram B. Krishnamurthy
  • Patent number: 9020337
    Abstract: A local oscillation light source outputs locally-oscillated light. An light receiving unit phase-separates an input optical signal by making the optical signal interfere with the locally-oscillated light and outputs an analog electric signal corresponding to the phase-separated optical signal. An analog-to-digital converting unit converts the analog electric signal into a digital signal. A processing unit performs digital signal processing by using the digital signal. A failure detection unit determines whether or not the optical signal is being input to the light receiving unit, or detects a failure in the light receiving unit, the analog-to-digital converting unit or the processing unit based on light intensity of the optical signal, whether or not the analog electric signal can be generated in the light receiving unit, and an amplitude of the analog electric signal output from the light receiving unit.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: April 28, 2015
    Assignee: NEC Corporation
    Inventor: Takashi Tsubouchi
  • Patent number: 8995828
    Abstract: An optical transmission device includes an extractor that extracts respective optical signals from optical signals multiplexed from a plurality of optical signals of different wavelengths, a detector that detects wavelengths of the extracted respective optical signals, a storage that stores the wavelengths of the detected respective optical signals, and a processor that is operative to derive trends in wavelength variation of the respective optical signals based on the detected respective optical signals and the respective optical signals stored in the storage, and determines that either one or both of the extractor and the detector cause the wavelengths to be varied when the trends in wavelength variation of two or more wavelengths are the same.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: March 31, 2015
    Assignee: Fujitsu Limited
    Inventors: Yuichi Suzuki, Toshihiro Ohtani
  • Patent number: 8971701
    Abstract: A universal optical receiver may include an optical channel monitor configured to acquire spectral data for an optical signal on at least one selected optical channel, a tunable local oscillator configured to be tuned to a center frequency of the optical signal on the at least one selected optical channel, a storage device configured to store data associated with the optical signal responsive to acquisition of the spectral data and tuning of the tunable local oscillator, and processing circuitry configured to execute an algorithm that employs a plurality of binary distinctions based on physical characteristics of the optical signal and employs at least one calculation of figure of merit associated with a series of parameter values of the optical signal to identify a format of the optical signal.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: March 3, 2015
    Assignee: The Johns Hopkins University
    Inventors: Eric J. Adles, Michael L. Dennis, Raymond M. Sova, Joseph E. Sluz, Michael G. Taylor, Curtis R. Menyuk, John W. Zweck
  • Patent number: 8965200
    Abstract: A method, an apparatus and a system for detecting a connection status of an optical fiber jumper are provided in the embodiments of the present invention. The method for detecting a connection status of an optical fiber jumper includes: judging a connection status of a second port and a first port according to whether an optical signal sent by the first port to the second port through a first optical fiber is received, wherein the first optical fiber is connected to two ends of an optical fiber jumper, and the two ends of the optical fiber jumper are connected to the first port and the second port respectively; and obtaining a port identification corresponding to the first port according to the optical signal if the optical signal is received.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: February 24, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yunsheng Wen, Jun Zhao, Bo Wang, Xiaolei Shan
  • 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: 8934783
    Abstract: An Ethernet adapter system may include a transmitter to insert a payload type identifier sequence in a generic frame procedure header to indicate that a network is a converged enhanced Ethernet network. The transmitter may insert idle sequences in a stream of data frames transmitted along a link. The system may include a receiver to recognize a condition and to force a loss of synchronization condition on the link that will be converted by the receiver into a loss of light condition. The receiver may scan the transmitted stream of data frames for invalid data frames and introduce a code into the stream of data frames whenever an invalid data frame is detected.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: January 13, 2015
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Thomas A. Gregg, Rajaram B. Krishnamurthy
  • Patent number: 8923701
    Abstract: A wireless communications link comprising an RF link and a free space optics (FSO) link, a switch, an RF signal monitoring apparatus, an optical signal monitoring apparatus, alarm apparatus and a controller. The switch operates in a normal mode to aggregate the links to form a link aggregation group and to route traffic on the link aggregation group, a first protection mode to route traffic on the FSO link, or a second protection mode to route traffic on the RF link. The controller is arranged to receive an alarm signal and to generate and transmit a control signal to cause the switch to operate in the first protection mode when a first alarm signal is received, the second protection mode when a second alarm signal is received, and the normal mode when an indicator is received indicating that both signal quality parameters are above their threshold values.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: December 30, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Antonio D'Errico, Marzio Puleri
  • Patent number: 8886034
    Abstract: The present invention provides systems and methods for a receiver threshold optimization loop to provide self-contained automatic adjustment in a compact module, such as a pluggable optical transceiver. The receiver threshold optimization loop utilizes a performance metric associated with the receiver, such as FEC, to optimize performance of the receiver. The receiver is optimized through a change in the receiver threshold responsive to the performance metric. Advantageously, the present invention provides improved receiver performance through a continuous adjustment that is self-contained within the receiver, such as within a pluggable optical transceiver compliant to a multi-source agreement (MSA). The receiver threshold optimization loop can include a fine and a coarse sweep of adjustment from an initial setting.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: November 11, 2014
    Assignee: Menara Networks, Inc.
    Inventors: Qingzhong Cai, Xiaoguang Sun, Gabriel E. Cardona
  • Patent number: 8873946
    Abstract: A system and method is disclosed that allows for the monitoring, analyzing and reporting on performance, availability and quality of optical network paths. The correlation of PM parameter metrics to client connections, coupled with threshold-based alarm generation provides a proactive and predictive management, reporting and analyzing of the health and effectiveness of individual path connections to alert Operational Support (OS) staff and/or customers to signal degradation and impending Network Element (NE) failures. The system and method performs in real-time processing intervals required for alarm surveillance in a telecommunications network.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: October 28, 2014
    Assignee: AT&T Intellectual Property II, L.P
    Inventors: David Mayo, Meei-Ling Chen
  • Patent number: 8798458
    Abstract: Exemplary systems, devices, and methods for evaluating a link status of a fiber-optic communication system are disclosed. An exemplary transceiver device includes a transmitter configured to transmit an optical signal having a first wavelength to an additional transceiver device by way of a single optical fiber, a receiver configured to receive an optical signal having a second wavelength from the additional transceiver device by way of the single optical fiber, and a link status facility communicatively coupled to the transmitter and the receiver and configured to provide one or more visual indications of a link status between the transceiver device and the additional transceiver device. Corresponding systems, devices, and methods are also disclosed.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: August 5, 2014
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Nee Ben Gee, Glenn A. Wellbrock, Tiejun J. Xia
  • Patent number: 8798459
    Abstract: The optical receiver includes: a photoelectric conversion circuit for receiving an optical signal and converting the received optical signal into an electrical signal; a comparator for outputting a first determination signal (S1) when a voltage corresponding to the optical signal does not reach a first threshold value (TH1) and for canceling an output of the S1 when the voltage corresponding to the optical signal exceeds a second threshold value larger than TH1 during the S1 is output; a timing extraction circuit for generating a clock signal based on a frequency and a phase of the electrical signal obtained by the converting and for outputting a second determination signal (S2) when the generated clock signal does not satisfy a predetermined condition; a unit for causing the comparator to output the S1 when the S2 is output; and detects loss of optical signal while one of the S1 and S2 is output.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: August 5, 2014
    Assignee: Oclaro Japan, Inc.
    Inventors: Masaaki Furukawa, Kouhei Sagara
  • Publication number: 20140161442
    Abstract: The present invention relates to a fiber transmission field and provides a data sending or receiving method, device, and apparatus used in optical fiber transmission. The method includes: detecting data to be transmitted; encoding one bit pulse width to M parts if the to-be-transmitted data is 0, wherein the first part is a high-level, the later M?1 part is a low-level; encoding one bit pulse width to N parts if the to-be-transmitted data is 1, wherein the first part is a high level, and the later N?1 part is a low-level, the M is not equal to the N but both are integer which is greater than or equal to 2; and sending the encoded level signal.
    Type: Application
    Filed: August 8, 2012
    Publication date: June 12, 2014
    Applicant: AEROSPACE SCIENCE & INDUSTRY SHENZHEN (GROUP) CO., LTD.
    Inventors: Jun Yang, Lin Cheng
  • Patent number: 8718465
    Abstract: N optical transceivers are each connected to a respective electronic module in one-to-one relation such that a respective one electronic module controls a respective one optical transceiver. An electronic switch matrix provides cross-connect capability between the P redundant electronic modules and N electronic modules to the N optical transceivers. A system controller determines when an active N electronic module has failed, and configures the electronic switch matrix to switch a P redundant electronic module into the optical transceiver to which the failed electronic module was connected. A system switch module redirects traffic and routing information, under the direction of the system controller, from the failed module to the newly activated redundant module so that the redundant module assumes the functionality of the failed module.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: May 6, 2014
    Assignee: Adtran, Inc.
    Inventors: Vahid Sahebekhtiari, Leif J. Sandstrom
  • Patent number: 8699872
    Abstract: An optical communications system includes a MSAP and an optical transceiver mounted at the MSAP that communicates over an optical network to at least one optical network terminal (ONT). A first electronic module is operatively connected to the optical transceiver and configured to control the optical transceiver and mounted at the MSAP separate from the optical transceiver. A redundant second electronic module is supported within the MSAP and mounted separate from the optical transceiver. A Mux/Demux module interconnects and supports the first and second electronic modules to form an integral unit and mounted at the MSAP separate from the optical transceiver. The Mux/Demux module is configured to switch the second electronic module into communication with the optical transceiver upon failure of the first electronic module.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: April 15, 2014
    Assignee: Adtran, Inc.
    Inventors: Vahid Sahebekhtiari, Leif J. Sandstrom
  • Patent number: 8670673
    Abstract: The invention relates to a method of operating an optical transmission system (100a, 100b, 100c), wherein at least one optical data signal is transmitted over an optical transmission link (120), which particularly comprises at least one optical fiber (120a). The inventive method is characterized by modulating (200) said data signal with a test signal (s) having a predetermined modulation frequency fmod to obtain a modulated data signal (Pin), by receiving (210) a reflected portion (Pback) of said modulated data signal (Pin), and by determining (220) a fiber quality measure (a) depending on said received reflected portion (Pback) of said modulated signal (Pin).
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: March 11, 2014
    Assignee: ADVA AG Optical Networking
    Inventor: Michael Eiselt
  • Patent number: 8644172
    Abstract: The invention relates to a network comprising at least one host device having an interface card connected to a backplane of said host device, wherein said interface card comprises at least one cage for receiving a pluggable module which performs a traffic management of data transported via at least one optical fiber connected to said pluggable module.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: February 4, 2014
    Assignee: ADVA Optical Networking SE
    Inventors: Henning Hinderthuer, Mirko Lawin
  • Publication number: 20140023359
    Abstract: A local oscillation light source outputs locally-oscillated light. An light receiving unit phase-separates an input optical signal by making the optical signal interfere with the locally-oscillated light and outputs an analog electric signal corresponding to the phase-separated optical signal. An analog-to-digital converting unit converts the analog electric signal into a digital signal. A processing unit performs digital signal processing by using the digital signal. A failure detection unit determines whether or not the optical signal is being input to the light receiving unit, or detects a failure in the light receiving unit, the analog-to-digital converting unit or the processing unit based on light intensity of the optical signal, whether or not the analog electric signal can be generated in the light receiving unit, and an amplitude of the analog electric signal output from the light receiving unit.
    Type: Application
    Filed: June 14, 2013
    Publication date: January 23, 2014
    Inventor: Takashi TSUBOUCHI
  • Patent number: 8625984
    Abstract: A transmission device includes a transponder including an oscillator configured to oscillate a local optical laser, a wavelength controller configured to control an oscillation wavelength of the local optical laser to receive desired input signal light, and a coherent receiver configured to combine and detect the local optical laser and input signal light. A controller is configured to control the oscillation wavelength using a wavelength of the input signal light detected by the coherent receiver, to determine an erroneous connection of a signal line related to the input signal light, when the wavelength of the input signal light is not an expected wavelength.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: January 7, 2014
    Assignee: Fujitsu Limited
    Inventors: Yoshinobu Matsukawa, Yuya Ishida
  • Patent number: 8565595
    Abstract: Method and apparatus for optimizing a decision threshold of an optical receiver is used to solve a problem of affecting system stability and reliability. The method comprises: determining a maximum value and a minimum value of an adjustment range of the decision threshold, and determining an adjustment step of the decision threshold (10); adjusting a decision threshold value within the adjustment range of the decision threshold, and separately detecting pre-FEC BERs corresponding to different decision threshold values (11); and searching for a minimum value in the detected pre-FEC BERs, a decision threshold value corresponding to the minimum value being an optimal decision threshold value (12). The apparatus comprises a decision threshold adjusting unit, a pre-FEC BER detecting unit, a decision threshold control unit and an optimal decision threshold determining unit.
    Type: Grant
    Filed: July 24, 2009
    Date of Patent: October 22, 2013
    Assignee: ZTE Corporation
    Inventor: Xiao Peng
  • Patent number: 8532482
    Abstract: A method and apparatus for detecting Passive Optical Network (PON) failures, and a PON system are provided to obtain the monitoring information of a peer device before a PON system failure occurs. The method includes: obtaining monitoring information of an Optical Line Terminal (OLT) and an Optical Network Unit (ONU); and determining a failure of a passive ONU according to the obtained monitoring information of the OLT and the ONU. The monitoring information of the peer device is obtained before a PON system failure occurs. Thus the failure is discovered in time, quick troubleshooting is ensured, and the costs of system maintenance are reduced.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: September 10, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Sulin Yang
  • Patent number: 8462906
    Abstract: One embodiment relates to an integrated circuit which includes a transmitter buffer circuit, a duty cycle distortion (DCD) detector, correction logic, and a duty cycle adjuster. The DCD detector is configured to selectively couple to the serial output of the transmitter buffer circuit. The correction logic is configured to generate control signals based on the output of the DCD detector. The duty cycle adjuster is configured to adjust a duty cycle of the serial input signal based on the control signals. Another embodiment relates to a method of correcting duty cycle distortion in a transmitter. Other embodiments and features are also disclosed.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: June 11, 2013
    Assignee: Altera Corporation
    Inventor: Weiqi Ding
  • Patent number: 8423850
    Abstract: A pulse transmission technique is used for wireless communication between a microcomputer (13) having a debugging support circuit (17) and a debugger (13). The pulse transmission technique is based on magnetic field coupling between a first coil (14) provided for the microcomputer and a second coil (8) coupled with the debugger. During an initialization operation, the microcomputer performs a process of configuring a communication condition of the wireless communication to perform the wireless communication. The microcomputer awaits control from the debugger when the microcomputer establishes communication with the debugger. The debugger awaits establishment of the communication and proceeds to control of the microcomputer in accordance with the wireless communication. It is possible to provide contactless interface for system debugging without the need for a large antenna or a large-scale circuit for modulation and demodulation.
    Type: Grant
    Filed: November 8, 2007
    Date of Patent: April 16, 2013
    Assignees: Renesas Electronics Corporation, Keio University
    Inventors: Shunichi Iwata, Yoichi Takahata, Toshihiko Sugahara, Yutaka Takikawa, Yoshihiro Shimizu, Hiroki Ishikuro, Tadahiro Kuroda
  • Patent number: 8406621
    Abstract: A method is provided for measuring a factor, called herein the single-port rejection ratio (SPRR), characterizing a balanced detection device. The SPRR is representative of the ratio of the weak differential output current measured under illumination of a single-port of the balanced detection device to the strong measurable differential output current obtained under dual-port illumination. An apparatus for measuring the SPRR is also provided.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: March 26, 2013
    Assignee: Teraxion Inc.
    Inventors: Yves Painchaud, Michel Poulin, Michel Morin
  • Patent number: 8391721
    Abstract: A method for remote communication using the interpretation of thermoluminescence or photoluminescence signals uses a property of photoluminescence or of thermoluminescence when it is caused by entangled trapped electrons. In this case, stimulation of deexcitation of trapped electrons by heat or radiation occurs when the deexcitation thermal energy is approximately equal to the trap-emptying energy. Stimulation by a temperature rise of a “master” sample induces luminescence of a remote “slave” “entangled” sample, which is reproduced on lowering the temperature of the “master” sample whatever the distance and the media separating the “master” sample and the “slave” sample. This teaching and its generalization to other forms of stimulation is used by the method of interpreting the quantum reception measurements so as to determine, using a correlation method, the transmission of information or commands.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: March 5, 2013
    Assignee: Saquant
    Inventor: Robert Desbrandes
  • Patent number: 8391706
    Abstract: An optical signal division transmission system in which an input optical signal is divided into N parts (termed as “N-part optical signals”) and transmitted at a transmission rate of 1/N, wherein an additional optical wave path is provided separately from an optical wave paths for transmitting said N-part optical signals, and even if a malfunction occurs in any one of said optical wave paths for transmitting said N-part optical signals, transmission of said N-part optical signals is continued, using said additional optical wave path.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: March 5, 2013
    Assignee: NEC Corporation
    Inventors: Keiichi Yamada, Tsutomu Tajima
  • Patent number: 8326148
    Abstract: An optical network is disclosed comprising one or more photonic switching nodes is disclosed. Each of the switching nodes comprises a plurality of input ports; at least one output port; and a switch configured to route messages between the plurality of input ports and the at least one output port and provide bufferless resolution of contention between messages for a common output port.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: December 4, 2012
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Keren Bergman, Assaf Shacham
  • Patent number: 8290362
    Abstract: A system and method is disclosed that allows for the monitoring, analyzing and reporting on performance, availability and quality of optical network paths. The correlation of PM parameter metrics to client connections, coupled with threshold-based alarm generation provides a proactive and predictive management, reporting and analyzing of the health and effectiveness of individual path connections to alert Operational Support (OS) staff and/or customers to signal degradation and impending Network Element (NE) failures. The system and method performs in real-time processing intervals required for alarm surveillance in a telecommunications network.
    Type: Grant
    Filed: March 4, 2008
    Date of Patent: October 16, 2012
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: David Mayo, Meei-Ling Chen
  • Patent number: 8270636
    Abstract: Systems and methods to minimize signal loss and distortions with connections of audio sources and speakers are disclosed. Fiber optic cables are used instead of conventional cables. The audio signals are kept always in the analog domain, no matter if they are in optical or electric format. The strength of the audio signals can be controlled by a volume control unit. A small amplifier unit can either directly plugged to speakers are connected to the speakers via a short speaker cable. A preamplifier is no more necessary in the system.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: September 18, 2012
    Inventor: Chun Ming (Jimmy) Ko
  • Patent number: 8254780
    Abstract: In a passive optical network system, a parent station includes a reception circuit that receives an optical signal from each of child stations using a threshold used to identify if the optical signal is 0 or 1; a bandwidth setting unit that determines a time at which each child station sends an optical signal; a storage unit that stores thresholds and intensities of optical signals received from the child stations; and a control unit that sets a threshold, stored corresponding to a sending time, in the reception circuit to control a reception of an optical signal. The control unit has a function that compares an intensity of a signal received from each child station at an optical signal reception time with information stored in the storage unit to detect and determine a fault in the child station or in the optical fiber connected to the child station.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: August 28, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Mizutani, Yusuke Yajima, Yoshihiro Ashi
  • Publication number: 20120213507
    Abstract: An Ethernet adapter system may include a transmitter to insert a payload type identifier sequence in a generic frame procedure header to indicate that a network is a converged enhanced Ethernet network. The transmitter may insert idle sequences in a stream of data frames transmitted along a link. The system may include a receiver to recognize a condition and to force a loss of synchronization condition on the link that will be converted by the receiver into a loss of light condition. The receiver may scan the transmitted stream of data frames for invalid data frames and introduce a code into the stream of data frames whenever an invalid data frame is detected.
    Type: Application
    Filed: February 17, 2011
    Publication date: August 23, 2012
    Applicant: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Thomas A. Gregg, Rajaram B. Krishnamurthy
  • Patent number: 8249447
    Abstract: The present invention provides systems and methods for a receiver threshold optimization loop to provide self-contained automatic adjustment in a compact module, such as a pluggable optical transceiver. The receiver threshold optimization loop utilizes a performance metric associated with the receiver, such as FEC, to optimize performance of the receiver. The receiver is optimized through a change in the receiver threshold responsive to the performance metric. Advantageously, the present invention provides improved receiver performance through a continuous adjustment that is self-contained within the receiver, such as within a pluggable optical transceiver compliant to a multi-source agreement (MSA). The receiver threshold optimization loop can include a fine and a coarse sweep of adjustment from an initial setting.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: August 21, 2012
    Assignee: Menara Networks, Inc.
    Inventors: Qingzhong Cai, Xiaoguang Sun, Gabriel E. Cardona
  • Patent number: 8249448
    Abstract: A communication device comprises a port via which the communication device is operable to communicate over a communication channel; command hardware operable to output a controlled signal over the communication channel; monitor hardware operable to monitor the controlled signal and output a controlling signal to block propagation of the controlled signal if a fault is identified in the controlled signal; and signal blocking circuitry coupled to a transmission path of the controlled signal and to a transmission path of the controlling signal; wherein, when the controlled signal is to be blocked, the signal blocking circuitry applies the controlling signal to the controlled signal such that a receiver at one end of the transmission path of the controlled signal identifies the controlled signal as a faulty signal; and wherein, when the controlled signal is not being blocked, the controlled signal is unimpeded by the signal blocking circuitry.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: August 21, 2012
    Assignee: Honeywell International Inc.
    Inventor: Kevin R. Driscoll
  • Patent number: 8213798
    Abstract: An optical transmission apparatus for suppressing deterioration of transmission quality due to XPM in a wavelength division multiplexing optical communication system in which an intensity modulation optical signal and a phase modulation optical signal exist in a mixed form. The apparatus has an intensity inversion signal light output section which outputs light having an intensity pattern obtained by inverting intensity changes of the intensity modulation optical signal near a wavelength of the intensity modulation optical signal in arrangement on wavelength axis of optical wavelengths that can be multiplexed as a wavelength division multiplexed signal as intensity inversion signal light, and a wavelength division multiplexed optical signal output unit which wavelength-division-multiplexes the intensity modulation optical signal, the phase modulation optical signal and light from the intensity inversion signal light output section and outputs a wavelength division multiplexed optical signal.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: July 3, 2012
    Assignee: Fujitsu Limited
    Inventors: Hiroki Ooi, Hiroshi Onaka, George Ishikawa
  • Publication number: 20120155858
    Abstract: Provided is an optical network system having a plural of slave-station devices, in that it is possible for a master-station device to efficiently identify malfunctioning slave-station devices, even in the case that a plurality of slave-station devices are malfunctioning.
    Type: Application
    Filed: August 24, 2010
    Publication date: June 21, 2012
    Applicant: NEC Corporation
    Inventor: Hirokazu Ozaka
  • Patent number: 8170414
    Abstract: Methods and systems for an optical line termination including instructions stored on a computer-readable medium, the instructions including a digital diagnostic table, and a plurality of entries within the diagnostic table, wherein a first entry is associated with a first optical network unit, the first entry including at least one setting for performing burst mode digital diagnostic processes using a first burst mode transmission received from the first optical network unit.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: May 1, 2012
    Assignee: Finisar Corporation
    Inventors: JinXiang Liu, HuiJie Du, Miatsu Okitsu
  • Patent number: 8121476
    Abstract: An all-optical carrier sense multiple access collision detection apparatus and method for checking by using mutual gain saturation whether distortion occurs in two or more optical signals due to mutual interference when the optical signals pass through a semiconductor optical amplifier.
    Type: Grant
    Filed: June 9, 2006
    Date of Patent: February 21, 2012
    Assignee: Gwangju Institute of Science and Technology
    Inventors: Chang Soo Park, Soo Wook Han, Tae Young Kim, Hyun Ho Yun
  • Publication number: 20120033963
    Abstract: An ONU that receives a discovery gate transmitted by an OLT in a predetermined cycle, returns a response signal in response to the discovery gate, and receives a unicast frame transmitted to the ONU by the OLT having received the response signal, comprising: a received frame detecting unit that detects whether a signal received from the OLT is a discovery gate or a unicast frame; and an erroneous emission detecting unit that detects an abnormal emission state, based on a result detected by the received frame detecting unit.
    Type: Application
    Filed: April 7, 2009
    Publication date: February 9, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hideki Nose, Kaori Mie
  • Patent number: 8103164
    Abstract: Optical test apparatus. A test apparatus for testing transmitter or receiver devices. The test apparatus includes a transmitter source configured to connect to an optical transmitter. A wide band, wide area optical detector is adapted to optically couple to the optical transmitter powered by the transmitter source. A filter is connected to the optical detector. The filter is configured to separate AC and DC portions of a signal received from the optical detector. A true RMS converter is connected to the filter. The filter is configured to convert an AC noise signal received from the filter to a function of an RMS value of the AC noise signal received from the optical detector. A data acquisition system is connected to the true RMS converter. The data acquisition system is configured to characterize noise characteristics of the transmitter source.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: January 24, 2012
    Assignee: Finisar Corporation
    Inventor: André Lalonde
  • Patent number: 8103176
    Abstract: The present invention relates to a frequency offset compensating apparatus and method, and an optical coherent receiver.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: January 24, 2012
    Assignee: Fujitsu Limited
    Inventors: Lei Li, Zhenning Tao, Hisao Nakashima
  • Patent number: 8103163
    Abstract: Provided are an optical output power control method that provides optical communication without harming the human body even when a transmission line is cut or no optical network unit (ONU) accesses a communication system, and a passive optical network (PON) system using the method. In the method, an optical signal having a predetermined period is transmitted when an optical communication system is in an abnormal state, wherein the predetermined period includes a laser-on time interval in which the optical signal has a normal power level and a laser-off time interval in which the optical signal is off or has a power level lower than the normal power level, so that the optical communication system performs optical communication without harming the human body even during the abnormal state.
    Type: Grant
    Filed: August 22, 2007
    Date of Patent: January 24, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Bin-Yeong Yoon, Bong-Kyu Kim, Dong-Soo Lee, Mun-Seob Lee, Jong-Deog Kim, Bong-Tae Kim
  • Patent number: 8098987
    Abstract: An optical transmitting and receiving apparatus 1 has a transmitting circuit unit 20 including a light emitting element 2 and a driving circuit 3 which drives the light emitting element 2, a receiving circuit unit 30 including a light receiving element 5 and amplification circuit 6 which amplifies a signal received from the light receiving element 5, a judging unit 8 which judges an abnormality or failure of either or both of the transmitting circuit unit 20 and the receiving circuit unit 30 based on a measured data value provided from the transmitting circuit unit 20 and/or the receiving circuit unit 30, and a measured value storing unit 9 which stores the measure data value in the case that the judging unit 8 judges the abnormality or failure occurs in the transmitting circuit unit 20 and/or the receiving circuit unit 30.
    Type: Grant
    Filed: October 22, 2008
    Date of Patent: January 17, 2012
    Assignee: Hitachi Cable, Ltd.
    Inventor: Keita Hattori
  • Patent number: 8041210
    Abstract: An optical transmission system includes more optical channels than electrical channels. If an optical channel is not functioning, the signals may be diverted to another optical channel since there are more optical channels than electrical channels. Embodiments of the present invention also relate to switches for switching the electrical channels to particular optical channels on either or both of the transmission and reception side. The switches include switching elements and selector elements for routing the electrical signals between the electrical channels and optical channels. In one embodiment, the multiple optical channels are incorporated into a single cable. The single cable may have the electrical interface for a number of electrical channels exposed for mechanical and electrical coupling with an external port, whereas the optical channels may be hidden within the cable coating.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: October 18, 2011
    Assignee: Finisar Corporation
    Inventors: Lewis B. Aronson, Darin J. Douma, Christopher R. Cole
  • Patent number: 7929860
    Abstract: A fiber-optic communications interface (110) and method of operation that operates with a paired fiber-optic communications interface (112) in a redundant communications termination point (101). The fiber-optic communications interface (110) has a paired card interface (122) that exchanges at least a first subset of status data between a local bearer processor (124) and a paired bearer processor (144) located within a different card cage (112). The local bearer processor (124) processes bearer data channels communicating with a remote site (102) through a remote site fiber-optic line (106). A local data interface (128) exchanges data contained in the bearer data channels between the local bearer processor (124) and a local user data network (114). The local data interface (128) also exchanges at least a second subset of the status data with the paired bearer processor (144) through the local user data network (114).
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: April 19, 2011
    Assignee: Motorola Mobility, Inc.
    Inventors: Karl E. Miller, Gregory C. Ladden, Takahito Yoshizawa
  • Patent number: 7881615
    Abstract: Alerts, such as laser driver current alarms, are triggered in an optoelectronic device based on dynamic digital diagnostics, such as operating temperature. Optoelectronic devices may execute microcode structured to represent a formulaic relation between a first parameter (e.g., temperature) and an indicator value for a second parameter (e.g., laser driver current). The microcode may further be structured to cause the optoelectronic device to access the first parameter, calculate an indicator value for the second parameter based on the accessed first parameter using the formulaic relation, access the second parameter, and compare the indicator value with the second parameter to determine whether to trigger an alert. If the second parameter exceeds the indicator value, the alert may be triggered, and may be indicative of potentially imminent optoelectronic device failure.
    Type: Grant
    Filed: July 26, 2007
    Date of Patent: February 1, 2011
    Assignee: Finisar Corporation
    Inventor: Suohai Mei
  • Patent number: 7881616
    Abstract: An operational optical transceiver configured to initiate operation in loop back mode. The optical transceiver includes transmit and receive signal paths, a memory capable of having microcode written to it, and a configurable switch array that is used to connect and disconnect the two signal paths as appropriate for a desired loop back mode. The microcode is structured to cause the optical transceiver to control the configurable switch array. This allows for analysis and diagnostics of the signal data.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: February 1, 2011
    Assignee: Finisar Corporation
    Inventors: Jayne C. Hahin, Gerald L. Dybsetter, Luke M. Ekkizogloy, Stephen T. Nelson
  • Patent number: 7877023
    Abstract: A light receiver has a photoelectric conversion circuit which converts an input optical signal into an electrical signal, an electric amplifier which amplifies the electrical signal output from the photoelectric conversion circuit, a threshold adjustment circuit which outputs a threshold value according to signal information in the optical signal, and an optical signal loss detection circuit which compares amplitude of the electric signal output from the electric amplifier with the threshold value output from the threshold adjustment circuit and outputs results of the comparison.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: January 25, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kenichi Uto
  • Patent number: 7856185
    Abstract: An optoelectronic module for converting and coupling an information-containing electrical signal with an optical fiber including a housing having an electrical input for coupling with an external cable or information system device and for transmitting and receiving information-containing electrical signals over such input, and a fiber optic connector adapted for coupling with an external optical fiber for transmitting and receiving an optical signal; an electro-optic subassembly coupled to the information containing electrical signal and converting it to and/or from a modulated optical signal corresponding to the electrical signal; parametric data-collection means disposed in the housing acquiring environmental and/or operational data associated with the module; and a communication interface for wirelessly transferring the data to an external device, such as a portable terminal.
    Type: Grant
    Filed: March 1, 2007
    Date of Patent: December 21, 2010
    Assignee: Emcore Corporation
    Inventors: Clay E. Hudgins, Daniel McGlynn
  • Publication number: 20100215359
    Abstract: An optical transceiver includes an electric terminal that can receive power from a host equipment and provide a power supply voltage to the optical transceiver, and a power failure monitor circuit that can detect an imminent loss of the power supply voltage. The power failure monitor circuit can produce a dying-gasp control signal when such imminent loss of power supply voltage is detected or when a disabling control signal is received from the host equipment. A driver can receive the dying-gasp control signal. An optical transmitter is powered by the power supply voltage and can emit a first optical signal under the control of the driver. The driver can modulate an envelope of the first optical signal in response to the dying-gasp control signal to produce a modulated envelope comprising a first dying gasp signal.
    Type: Application
    Filed: February 22, 2009
    Publication date: August 26, 2010
    Inventors: Wen Li, Fulin Pan, Jianhui Zhou
  • Patent number: 7751725
    Abstract: The present invention provides an optical receiver that includes a monitoring unit with a function to prevent the unit from misjudging of the loss-of-signal state. In particular, the present invention is applicable to the monitoring unit that receives the signal to be judged from the processing unit posterior to the optical converting unit that couples with the processing unit via the capacitor. The signal reflects the second or higher order response lag due to the coupling capacitor. The monitoring unit of the invention generates the loss-of-alarm signal when the signal is continuously smaller than the first reference by a preset time and continuously greater than the second reference by the present time.
    Type: Grant
    Filed: August 8, 2006
    Date of Patent: July 6, 2010
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Keiji Tanaka