Including Compensation Patents (Class 398/136)
  • Patent number: 10298330
    Abstract: An embodiment includes a host-equalized optical transceiver. The host-equalized optical transceiver includes a driver analog interface, a linear laser diode driver (LLDD), and an optical transmitter. The driver analog interface is configured to interface with a host integrated circuit (IC) of a host system. The LLDD is directly electrically coupled to a host IC of the host system via the driver analog interface. The LLDD is configured to receive an equalized electrical data signal directly from the host IC via the driver analog interface and to generate a driving signal based on the equalized electrical data signal. The equalized electrical data signal is a linear signal. The optical transmitter is electrically coupled to the LLDD. The optical transmitter is configured to receive the driving signal from the LLDD and to generate an optical signal that is representative of the driving signal.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: May 21, 2019
    Assignee: FINISAR CORPORATION
    Inventor: Jim Alan Tatum
  • Patent number: 10193631
    Abstract: The present disclosure relates to an optical module having digital diagnostic monitoring functions and a circuit and method to control the optical module. In an embodiment, a control circuit for an optical module including an optical receiving unit and an optical transmitting unit may comprise a first memory for storing a plurality of configuration parameters at predefined locations within the first memory, a second memory for storing a plurality of variables at dynamically allocated locations of the second memory, the plurality of variables including variables corresponding to a current operation status of the optical module, and an analog-to-digital converter configured to receive an analog signal corresponding to the current operation status and convert the analog signal to a digital value to be stored as the variable corresponding to the current operation status in the dynamically allocated location of the second memory.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: January 29, 2019
    Assignees: Accelink Technologies Co., Ltd., Wuhan Telecommunication Devices Co., Ltd
    Inventors: Long Chen, Fanrong Gao, Jun Zhang, Xianghong Yu
  • Patent number: 10180542
    Abstract: A control device that may be implemented in a single IC chip is provided that is capable of controlling EAM bias voltages and DFB bias currents and of monitoring the EAM photocurrents and received signal strength indicators (RSSIs) in a multi-channel optical transceiver module. The control device IC chip can be manufactured at relatively low cost with relatively high yield, and can be implemented in a relatively small area. To implement the control device in a single IC chip, multiple supply voltage domains are used in the IC chip, one of which is a negative supply voltage domain and one of which is a positive supply voltage domain. In order to provide these different supply voltage domains, a level shift circuit is employed in the IC chip that converts signals from the positive to the negative supply voltage domain, and vice versa, and changes the voltage levels, as needed.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: January 15, 2019
    Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITED
    Inventors: Samir Aboulhouda, Faouzi Chaahoub, Ahmed Rashid Syed, Kartikeya Gupta, Kazi Asaduzzaman
  • Patent number: 9882634
    Abstract: Systems and methods for connection validation between a pair of mated transceivers implemented in a network element include, responsive to a request for connection validation at a first transceiver of the pair of mated transceivers, performing a first optical loopback test through the first transceiver with a unique trace identifier; responsive to a successful first optical loopback test, providing the unique trace identifier to a second transceiver of the mated transceivers with a request for a second optical loopback test; performing the second optical loopback test through the second transceiver with the unique trace identifier; and, responsive to a successful second optical loopback test, providing the unique trace identifier back to the first transceiver from the second transceiver.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: January 30, 2018
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, Marc Veilleux
  • Patent number: 9621382
    Abstract: A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: April 11, 2017
    Assignee: Clariphy Communications, Inc.
    Inventors: Shih Cheng Wang, Seyedmohammadreza Motaghiannezam, Matthew C. Bashaw
  • Patent number: 9488769
    Abstract: A surface light guide includes a radiation exit area running along a main extension plane of the surface light guide and includes a light guiding region, which has scattering locations and a coating arranged on a first main area of the light guiding region, wherein radiation coupled in along the main extension plane impinging on the first main area after scattering at the scattering locations has an excessively increased radiation component and the coating reduces in a targeted manner an exit of the excessively increased radiation component from the radiation exit area.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: November 8, 2016
    Assignee: OSRAM Opto Semiconductors GmbH
    Inventors: Peter Brick, Joachim Frank, Stephan Kaiser, Gerhard Kuhn, Ales Markytan, Julius Muschaweck, Christian Neugirg
  • Patent number: 9455788
    Abstract: A hitless modulation change method at a node in an optical network includes determining that a modulation change is warranted for an optical modem in the node, the optical modem configured to communicate over an optical link; determining an impact of the modulation change on the optical link and associated underlying connections thereon; causing changes in a data plane for the associated underlying connections, prior to performing the modulation change; and causing the modulation change subsequent to accommodating the associated underlying connections in the data plane, thereby minimizing interruptions of the associated underlying connections due to the modulation change.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: September 27, 2016
    Assignee: Ciena Corporation
    Inventor: David W. Boertjes
  • Patent number: 9450698
    Abstract: The optical transmission device includes an N×N optical switch, an optical packet receiver and an optical packet generation unit. The N×N optical switch transmits data in which a plurality of optical signals each having a different wavelength is multiplexed. The optical packet receiver detects change in the number of wavelengths of optical signals constituting the data. The optical packet generation unit generates, when the change is detected by the optical packet receiver, data to be transmitted by the N×N optical switch, using optical signals for the number of wavelengths after the change.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: September 20, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Koji Matsunaga, Tatsuya Toyozumi, Yasuo Tanaka, Yuichiro Sakane, Koji Bato, Wataru Kawasaki, Tatsuhiko Saito
  • Patent number: 9397752
    Abstract: An optical transceiver module coupled to a device is provided. The optical transceiver module includes an electronic signal transmitting terminal coupled to a receiving terminal of the device, an electronic signal receiving terminal coupled to a transmitting terminal of the device, an optical signal receiving terminal coupled to the electronic signal transmitting terminal, and an optical signal transmitting terminal coupled to the electronic signal receiving terminal. When the optical transceiver module is at an normal operation state and the electronic signal receiving terminal does not receive any electronic signal over a first predetermined time period, the optical transceiver module enters a idle detection state to make the electronic signal transmitting terminal to perform a receiver termination detection to the device to determine whether the device is coupled to the optical transceiver module.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: July 19, 2016
    Assignee: VIA TECHNOLOGIES, INC.
    Inventors: Cheng-Ming Ying, Woei-Harng Lin, Yu-Lung Lin, Wei-Yu Wang
  • Patent number: 9392664
    Abstract: A method for operating an LED lighting device (L), wherein the LED lighting device comprises: at least two color channels (Ch1, Ch2, Ch3), wherein each color channel (Ch1, Ch2, Ch3) comprises at least one LED (LD1, LD2, LD3), wherein the LEDs (LD1, LD2, LD3) of a color channel (Ch1, Ch2, Ch3) each have the same color, and wherein each color channel (Ch1, Ch2, Ch3) is able to be activated separately, and at least one photodetector (D), which is configured and arranged to detect a portion of the light radiated by the LEDs (LD1, LD2, LD3), wherein the method comprises the steps of: switching over the LED lighting device (L) from an operating phase (BP 1) into a measurement phase (MP); and temporally consecutive activation of the color channels (Ch1, Ch2, Ch3) so that a light radiated during the measurement phase (MP) by the LEDs (LD1, LD2, LD3) has an integral mixture which substantially corresponds to a color mixture of the operating phase.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: July 12, 2016
    Assignee: OSRAM GmbH
    Inventors: Tobias Frost, Bakuri Lanchava
  • Patent number: 9391714
    Abstract: A nodal system (10) includes a unit (D) having a memory (42) and an optical data receiver (36), and a common control unit (12) in communication with the unit. A method of commissioning the system comprises the steps of activating the optical data receiver on the unit, and transmitting an optical data signal to the unit, thereby commissioning the unit.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: July 12, 2016
    Assignee: TYCO FIRE & SECURITY GMBH
    Inventors: Faruk Meah, Andrew D. Naish
  • Patent number: 9264135
    Abstract: A bidirectional pentaplex system is connected to a machine room. The machine room provides a first optical signal, a second optical signal and a monitoring signal and transmits to the bidirectional pentaplex system. The bidirectional pentaplexer includes a first receiving unit, a second receiving unit, a first emitting unit, a second emitting unit, a filter, a transceiver, a grating, a plurality of reflecting units and a control circuit. The receiving units and the transceiver respectively receives the signals, then the control circuit controls the emitting units emitting the feedback signals and transmits the feedback signals back to the machine room.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: February 16, 2016
    Assignee: NATIONAL TAIWAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Chang-Chia Chi, Chen-Wen Tarn, I-Ju Chen
  • Patent number: 9215010
    Abstract: Provided is a node device in an optical communication system in which a plurality of node devices are connected by a plurality of optical fibers, including: at least a first optical transceiver that consumes a first power consumption amount during standby; at least a second optical transceiver that consumes a second power consumption amount greater than the first power consumption amount during standby; and a power consumption control unit that preferentially selects the second optical transceiver as an optical transceiver to be maintained by the node device, the second optical transceiver being in a fast startup standby mode in which startup time from a standby state is shorter than allowable time of interruption time of a communication service in the optical communication system.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: December 15, 2015
    Assignee: NEC CORPORATION
    Inventor: Kenji Mizutani
  • Patent number: 9103948
    Abstract: A fiber bypass module and its adapted in-line equipment are provided. The fiber bypass module has an optical switch, a plurality of connectors, and a circuit substrate with an electrical signal control connector exposed. The electrical signal control connector may be plugged to the socket of the in-line equipment to receive the electrical control signal sent from the in-line equipment. The optical switch is provided on the circuit substrate and the electrical signal control connector is electrically connected with the optical switch such that the received electrical control signal is transmitted to the optical switch to execute the switching mode of the optical switch. Each of the plurality of connectors may be extended remotely to connect optical transceivers and optical network equipments, so that the optical transceivers and the fiber network equipments do not have to be provided at the same place as the in-line equipment.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: August 11, 2015
    Inventor: Sean Jiang
  • Patent number: 9083460
    Abstract: A semiconductor-based optical modulator includes a control loop to control and optimize the modulator's operation for relatively high data rates (above 1 GHz) and/or relatively high voltage levels. Both the amplitude of the modulator's driving voltage and the bias of the driving voltage may be adjusted using the control loop. Such adjustments help to optimize the operation of the modulator by reducing the number of errors present in a modulated data stream.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: July 14, 2015
    Assignee: Sandia Corporation
    Inventor: William A. Zortman
  • 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: 9025962
    Abstract: A system for transmitting an optical signal between a host and a device according to a SATA protocol. The system comprises a transmitting-side converter for generating a logic one voltage value responsive to a data one value from an information source, for generating a logic zero voltage value responsive to a data zero value from the information source, for generating an idle state logic voltage value, wherein the idle state logic voltage value is (logic one voltage value+logic zero voltage value)/2, the transmitting-side converter comprising only linear functions to preserve the idle state logic voltage value, and an electrical-to-optical converter for converting the logic one, logic zero and the idle state logic voltage values to an optical signal further comprising respective logic one, logic zero and idle state optical values and for supplying the optical signal to an optical communications medium.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: May 5, 2015
    Inventor: James V Wernlund
  • Patent number: 9008518
    Abstract: A system includes an optical transmitter package comprising an optical transmitter to generate optical transmission signals based on electrical transmission signals. The system also includes an optical receiver package comprising an optical receiver to generate electrical reception signals based on optical reception signals. The system further includes a printed circuit board (PCB) on which the optical transmitter package and the optical receiver package are mounted. The PCB includes a heat generating circuit component. The optical transmitter package can be mounted to the PCB to subjected to less heat from the heat generating circuit component than the optical receiver package.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: April 14, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Michael Renne Ty Tan, Glenn C. Simon, Sagi Varghese Mathai
  • Patent number: 8995845
    Abstract: A multi-laser transmitter optical subassembly may include N number of lasers, where each laser is configured to generate an optical signal with a unique wavelength. The transmitter optical subassembly may further include a focusing lens and a filter assembly. The filter assembly may combine the optical signals into a combined signal that is received by the focusing lens. The filter assembly may include N?1 number of filters. Each of the filters may pass at least one of the optical signals and reflect at least one of the optical signals. The filters may be low pass filters, high pass filters, or a combination thereof.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: March 31, 2015
    Assignee: Finisar Corporation
    Inventors: Tengda Du, Bernd Huebner
  • Publication number: 20150086215
    Abstract: System and method embodiments are provided for bit loading for optical Discrete Multi-Tone Transmission (DMT). In an embodiment, a method for bit loading for optical DMT transmission or reception includes receiving, at a processor, a bit data stream, wherein the bit data stream comprises a plurality of subcarriers; assigning, with the processor, a code rate to each of a plurality of forward error correction (FEC) encoders/decoders according to a mapping of a signal-to-noise-ratio (SNR) to a code rate for each of the subcarriers or subcarrier groups, wherein each FEC encoder/decoder corresponds to a respective one of the subcarriers or a respective subcarrier group; and assigning, with the processor, a modulation format to each subcarrier or each subcarrier group according to a mapping of an SNR for each subcarrier or subcarrier group to a bit number for a corresponding subcarrier or subcarrier group.
    Type: Application
    Filed: April 14, 2014
    Publication date: March 26, 2015
    Applicant: FUTUREWEI TECHNOLOGIES, INC.
    Inventors: Chen Chen, Mahdi Zamani, Zhuhong Zhang, Chuandong Li
  • Patent number: 8989588
    Abstract: An optical transceiver includes an optical IC coupled to a processor IC. For transmit, the optical IC can be understood as a transmitter IC including a laser device or array. For receive, the optical IC can be understood as a receiver IC including a photodetector/photodiode device or array. For a transmitter IC, the processor IC includes a driver for a laser of the transmitter IC. The driver includes an equalizer that applies high frequency gain to a signal transmitted with the laser device. For a receiver IC, the processor IC includes a front end circuit to interface with a photodetector of the receiver IC. The front end circuit includes an equalizer that applies high frequency gain to a signal received by the receiver IC. The driver can be configurable to receive a laser having either orientation: ground termination or supply termination.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: March 24, 2015
    Assignee: Intel Corporation
    Inventors: Gil Afriat, Lior Horwitz, Dror Lazar, Assaf Issachar, Alexander Pogrebinsky, Adee O. Ran, Ehud Shoor, Roi Bar, Rushdy A. Saba
  • Patent number: 8989589
    Abstract: An apparatus in one embodiment includes a transceiver housing operable to be inserted into a port of a host system, the port comprising at least a first channel and a second channel. The transceiver housing may be a compact small form-factor (SFP) pluggable module housing. The apparatus also includes a printed circuit board mounted in the transceiver housing and an electrical interface of the printed circuit board operable to interface with the port of the host system. The electrical interface includes a first transmit pin and a first receive pin configured to interface with the first channel of the port and a second transmit pin and a second receive pin configured to interface with the second channel of the port. A first connector couples the first transmit pin and the second receive pin, and a second connector couples the second transmit pin and the first receive pin.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: March 24, 2015
    Assignee: Cisco Technology, Inc.
    Inventors: Farrokh Mottahedin, Darren K. Hopcroft, Brice D. Achkir
  • Patent number: 8989583
    Abstract: A system and a method are disclosed for generating an infrared signal on a mobile device. The infrared signal is generated on a mobile device by generating a bitstream based on information to be transmitted as an infrared signal. The bitstream is modulated and output on a bus to an infrared-emitting diode. The bitstream is processed in a software layer configured on the computing device, enabling the computing device to generate and process signals without additional hardware configured on the device.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: March 24, 2015
    Assignee: Peel Technologies, Inc.
    Inventors: Samyeer Suresh Metrani, Siva Subramanian Muthukumarasamy
  • Publication number: 20150078759
    Abstract: A distortion compensation circuit compensates for the distortions generated by the dispersion-slope of an optical component and the frequency chirp of an optical transmitter. The dispersion compensation circuitry can be utilized in the optical transmitter, the optical receiver and/or at some intermediate point in a fiber-optic network. One embodiment of the compensation circuit utilizes a primary electrical signal path that receives at least a portion of the input signal and a delay line; and a secondary signal path in parallel to the primary path that receives at least a portion of the input signal and including: an amplifier with an electrical current gain that is proportional to the dispersion-slope of the optical component, an optional RF attenuator, an optional delay line, a “squarer” circuit, and a “differentiator” circuit.
    Type: Application
    Filed: June 11, 2014
    Publication date: March 19, 2015
    Applicant: AURORA NETWORKS, INC.
    Inventor: Sudhesh Mysore
  • Patent number: 8983300
    Abstract: A system and a method are disclosed for receiving an infrared signal on a mobile device. The mobile device receives an infrared signal by creating an intermediate bitstream based on the received infrared signal. The intermediate bitstream is trimmed, downsampled, and demodulated in the time domain. The intermediate bitstream is then converted into a raw infrared code. The received bitstream is processed in a software layer, enabling the mobile device to process infrared signals without the use of additional hardware configured on the mobile device.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: March 17, 2015
    Assignee: Peel Technologies, Inc.
    Inventors: Samyeer Suresh Metrani, Siva Subramanian Muthukumarasamy
  • Publication number: 20150063812
    Abstract: An optical node comprises a tunable optical transceiver having a laser and a temperature element. The optical node also comprises a wavelength shift stabilization circuit configured to adjust current provided to the temperature element such that wavelength shifts, due to changes in a drive current applied to the tunable optical transceiver, are reduced.
    Type: Application
    Filed: August 21, 2014
    Publication date: March 5, 2015
    Inventors: Jason Dove, Harold A. Roberts
  • Patent number: 8971717
    Abstract: An optical system has an optical emitter that transmits an optical signal through an optical fiber. An optical detector detects light from the fiber and provides an analog signal indicative of such light. A crosstalk cancellation element is configured to receive an electrical signal from the optical emitter and to adjust such signal in order to form a cancellation signal that models the optical and/or electrical crosstalk affecting the analog signal. The cancellation signal is subtracted from the analog signal thereby removing optical and/or electrical crosstalk from the analog signal.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: March 3, 2015
    Assignee: ADTRAN, Inc.
    Inventor: Daniel M. Joffe
  • Patent number: 8938171
    Abstract: The present invention discloses a synchronization method suitable for increasing the receiving speed in the receiving part of an orthogonal optical frequency division multiplexing (OOFDM) transceiver.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: January 20, 2015
    Assignee: Bangor University
    Inventors: Jianming Tang, Xianqing Jin
  • Patent number: 8938164
    Abstract: A system includes two optical modules that perform auto-setting of the optical links between the optical modules. One optical module sends an optical signal with a test pattern to the other optical module. If the receiving module determines that the test pattern is successfully received, it sends a pass indication to the transmitting module, and the transmitting module can configure its driver path in accordance with a transmit current setting used to transmit the test pattern. If the test pattern is not successfully received, the receiving module sends a fail indication, and the transmitting module can increase the transmit current setting and resend the test pattern. When the system includes multiple optical channels, one channel can be tested while feedback is provided on another channel. The system can iterate through all optical channels until they are all configured.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: January 20, 2015
    Assignee: Intel Corporation
    Inventors: Miaobin Gao, Christine M. Krause, Hui-Chin Wu, Hengju Cheng
  • Patent number: 8934779
    Abstract: Methods, architectures, circuits, and/or systems for monitoring operating parameters and/or generating status indications associated with electronic device operation are disclosed. The method can include (i) monitoring a first operating parameter related to operation of the electronic device to determine a first parameter value, (ii) calculating a difference between the first parameter value and a predetermined value for the first operating parameter, (iii) monitoring a second operating parameter on which thresholds for operational warnings and/or alarms are based to determine a second parameter value, (iv) updating or changing the thresholds based on a predetermined change or event in the second parameter value, (v) comparing the difference to the updated or changed thresholds, and (vi) generating a corresponding one of the operational warnings and/or alarms when the difference crosses at least one of the thresholds in a predetermined direction.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: January 13, 2015
    Assignee: Source Photonics, Inc.
    Inventors: Todd Rope, Mark Heimbuch
  • Patent number: 8934778
    Abstract: The object of the present invention is to reliably prevent deterioration and failure of reception relevant parts in a transmission apparatus on a reception side without using an attenuator. An output value control method that controls an output value of output information transmitted from each of transmission apparatuses, in which a transmission apparatus transmits the output information having a minimum output value as the output value to the other transmission apparatus, and when the output information does not reach the other transmission apparatus, the transmission apparatus repeats transmission of the output information after increasing the own output value by adding a predetermined value to a previous output value, and then the other transmission apparatus that has received the output information calculates the output value of the transmission apparatus, and notifies the calculated output value of the transmission apparatus as an appropriate output value to the transmission apparatus.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: January 13, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Yusho Futami, Kazuhiro Watanabe
  • 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
  • Publication number: 20150010312
    Abstract: Apparatuses and methods for an optical data interface with electrical forwarded clock are provided. One example optical data interface (220, 320) can include a transmitter (224, 324) having a data input (232, 332) and a clock input (242, 342), and a receiver (226, 326) having a data output (271, 339) and a forwarded clock signal path (254, 376). An optical communication path (248, 348) is coupled between the data input (232, 332) and the data output (271, 339) and configured to communicate a data signal. An electrical communication path (236, 336) is coupled between the clock input (242, 342) and the forwarded clock signal path (254, 376). The electrical communication path (236, 336) is arranged to forward a clock signal used by the receiver (226, 326) as a reference for the optical data signal.
    Type: Application
    Filed: April 24, 2012
    Publication date: January 8, 2015
    Inventors: Daniel A. Berkram, Dacheng Zhou
  • Patent number: 8929744
    Abstract: Integrated performance monitoring (PM); optical layer operations, administration, maintenance, and provisioning (OAM&P); alarming; amplification, and the like is described in optical transceivers, such as multi-source agreement (MSA)-defined modules. An optical transceiver defined by an MSA agreement can include advanced integrated functions for carrier-grade operation which preserves the existing MSA specifications allowing the optical transceiver to operate with any compliant MSA host device with advanced features and functionality. The optical transceiver can include CFP and variants thereof (e.g., CFP2, CDFP, CXP), OIF-MSA-100GLH-EM-01.0, CCRx (Compact Coherent Receiver), Quad Small Form-factor Pluggable (QSFP) and variants thereof (e.g., QSFP+, QSFP2), 10×10 MSA, XFP, XPAK, XENPAK, X2, XFP-E, SFP, SFP+, 300-pin, and the like.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: January 6, 2015
    Assignee: Menara Networks, Inc.
    Inventors: Siraj Nour El-Ahmadi, Salam El-Ahmadi, Adam R. Hotchkiss, Gabriel E. Cardona
  • Patent number: 8929747
    Abstract: A transmitter reduces or minimizes pulse narrowing. In one approach, an optical transmitter is designed to transmit data over an optical fiber at a specified data rate using on-off keying. The transmitter includes a pre-converter electrical channel and a limiting E/O converter. The pre-converter electrical channel produces a pre-converter signal that drives the limiting E/O converter. The pre-converter electrical channel is designed to reduce pulse narrowing in the pre-converter signal. In one implementation, the pre-converter electrical channel includes a pre-emphasis filter that is designed to minimize pulse width shrinkage.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: January 6, 2015
    Assignee: ClariPhy Communications, Inc.
    Inventor: Thomas A. Lindsay
  • Patent number: 8929742
    Abstract: An optical communication module in which the pin arrangement can be applied flexibly. An optical communication module has an outer shape formed based on normal standards and which is able to communicate with a host-side circuit board, etc. to which it is fitted, via a predetermined communication interface; wherein the optical communication module exchanges input/output I/F information with the circuit board, etc., and the communication interface can be switched to another communication interface based on these input/output I/F information.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: January 6, 2015
    Assignee: Furukawa Electric Co., Ltd.
    Inventor: Masayuki Miura
  • Patent number: 8909064
    Abstract: Aspects of the invention provide transmitters and receivers for managing multiple optical signals. High order modulation, such as phase and/or amplitude modulation, is used to achieve multiple bits per symbol by transporting multiple asynchronous data streams in an optical transport system. One or more supplemental multiplexing techniques such as time division multiplexing, polarization multiplexing and sub-carrier multiplexing may be used in conjunction with the high order modulation processing. This may be done in various combinations to realize a highly spectrally efficient multi-data stream transport mechanism. The system receives a number of asynchronous signals which are unframed and synchronized, and then reframed and tagged prior to the high order modulation. Differential encoding may also be performed. Upon reception of the multiplexed optical signal, the receiver circuitry may employ either direct detection without a local oscillator or coherent detection with a local oscillator.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: December 9, 2014
    Assignee: Google Inc.
    Inventors: Bikash Koley, Vijayanand Vusirikala, Hong Liu
  • Patent number: 8903247
    Abstract: A bidirectional interface for multimode optical fiber includes a receive/transmit optical fiber port operable to connect to a multimode optical fiber, a wavelength separating module in communication with the receive/transmit optical fiber port, an optical receiver module in communication with the wavelength separating module and configured to receive optical signals at a first wavelength via the wavelength separating module and the receive/transmit optical fiber port, and an optical transmit module in communication with the wavelength separating module and configured to transmit at a second wavelength via the wavelength separating module and the receive/transmit optical fiber port.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: December 2, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Marco Mazzini, Cristiana Muzio, Alessandro Sguazzotti, Federico Fontanella
  • Patent number: 8903254
    Abstract: The present disclosure relates to an optical transceiver for use in optical fiber communications and/or telecommunications systems and, more specifically, a low power consumption, long range pluggable transceiver. The transceiver generally comprises a photodiode with a transimpedance amplifier (PIN-TIA); an electro-absorption modulated laser (EML); an optical detector; and a directly modulated laser (DML) driving module connected between the PIN-TIA and EML laser configured to drive the EML laser. A low power-consumption DML driving module is utilized to drive the EML laser, so as to further reduce power consumption. An impedance matching circuit can be applied to modulate an electro-absorption (EA) modulator of the EML laser with maximum efficiency.
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: December 2, 2014
    Assignee: Source Photonics, Inc.
    Inventors: Zhaoyang Hu, Lingqiong Zeng, Thomas Liljeberg
  • Publication number: 20140348511
    Abstract: A bi-directional optical transceiver includes multiple single mode optical ports and a multi-mode optical port. A multi-mode optical combiner combines single mode optical signals received at the single mode optical ports into a multi-mode optical signal at the multi-mode optical port. Each single mode optical signal has a distinct optical mode that does not interfere with the optical mode of the other single mode optical signals. A photo detector detects a total optical power of the plurality of single mode optical signals in the multi-mode optical signal. An amplifier is coupled to receive an output of the photo detector.
    Type: Application
    Filed: August 8, 2014
    Publication date: November 27, 2014
    Inventors: Venkatesh G. Mutalik, Marcel F. Schemmann
  • Patent number: 8891960
    Abstract: A method of communicating data between a network device and a data network to which the device is connected via an optical fiber data link in which the device is connected to the optical fiber data link and the connection is monitored to detect data communication at a first standard. If data communication is detected at the first standard, data communication is established using the first standard. If not, the connection is monitored at the second standard. If data communication is detected at the second standard, data communication is established using the second standard.
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: November 18, 2014
    Assignee: PacketFront Systems AB
    Inventor: Charles Foster
  • Patent number: 8891980
    Abstract: Methods, systems, and devices are described for a digital demodulator device for processing received optical signals. The device may include a quadrature error filter that receives a digitized version of an optical signal, and removes quadrature errors to generate a filtered series of data samples. The device may also include a frequency offset removal module for performing frequency rotation on the filtered series of data samples. The device may include a chromatic dispersion compensation module which removes chromatic dispersion from horizontal and vertical polarization channels. The device may include a polarization mode dispersion (PMD)/polarization dependent loss (PDL) compensation module which compensates for interference caused by PMD and PDL. The device may also include a phase recovery module configured to track and correct phase.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: November 18, 2014
    Assignee: ViaSat, Inc.
    Inventors: Fan Mo, William Thesling, Matthew Nimon, Sameep Dave
  • Patent number: 8885992
    Abstract: At the time of assembly of an optical transmission/reception module, a test variable wavelength light source 22 for outputting a test light signal is connected to a connector 8 of an optical fiber 7, and a large-diameter PD 23 measures a transmission loss in a light wavelength band limiting filter 12 while a rotational position determining unit 24 rotates a fiber ferrule 5, so that the rotational position determining unit 24 determines the rotational position ?loss-min of the fiber ferrule 5 which minimizes the transmission loss in the light wavelength band limiting filter 12, and aligns the fiber ferrule 5 at the rotational position ?loss-min.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: November 11, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tamon Omura, Nobuo Ohata, Masatoshi Katayama
  • Patent number: 8886051
    Abstract: Compensation for in-phase (I) and quadrature (Q) timing skew and offset in an optical signal may be achieved based on the correlation between derivatives of I and Q samples in the optical signal. The magnitude of the correlation between derivatives is measured to determine the presence of skew. Correlation between derivatives may be coupled with frequency offset information and/or with trials having additional positive and negative skew to determine presence of skew. Correlations are determined according to pre-defined time periods to provide for continued tracking and compensation for timing skew that may result from, for example, thermal drift.
    Type: Grant
    Filed: February 12, 2014
    Date of Patent: November 11, 2014
    Assignee: ViaSat, Inc.
    Inventors: Yuri Zelensky, Fan Mo
  • Publication number: 20140328600
    Abstract: A multi-channel or bidirectional optoelectronic device comprises a two or more optoelectronic components, e.g., a photodetector and a light source. A protective encapsulant can be applied to the optoelectronic device that includes hollow dielectric microspheres to reduce electrical cross-talk, and that can further include an optical absorber to reduce optical cross-talk.
    Type: Application
    Filed: May 19, 2014
    Publication date: November 6, 2014
    Applicant: HOYA Corporation USA
    Inventors: Araceli Ruiz, Peter C. Sercel, Joel S. Paslaski, Rolf A. Wyss
  • Publication number: 20140321861
    Abstract: A digital burst mode communication system operates at a fixed wavelength for transmission and reception of burst mode signals using a pair of transceivers and a single optical cable. The stray noise level in the system is significantly reduced by use of angled plate absorbers that receive scattered transmission burst signal from a 45 degree partially reflecting mirror. Use of transparent glass ferrule with or without a front surface anti-reflection coating instead of an opaque ceramic ferrule to support optical fiber at a selected location within the transreceiver reduces optical detector signal noise. Isolation of received burst signal from transmitted burst signal is increased to better than 30 dB. The system operates by sending only data bits across the single optical cable without scrambling or encoding preambles, significantly improving the efficiency of high speed communication.
    Type: Application
    Filed: April 25, 2013
    Publication date: October 30, 2014
    Inventors: Yusuke Ota, Kenichiro Takeuchi
  • Patent number: 8867921
    Abstract: Techniques, apparatus and systems to provide carrier signal transmission in reciprocal transmission architecture networks for optical communications.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: October 21, 2014
    Assignee: Ziva Corporation
    Inventors: David F. Smith, Anis Husan
  • Patent number: 8855484
    Abstract: The present invention is to provide a method applicable to a fiber-optic transceiver including a transmitter optical subassembly (TOSA) provided therein with a laser diode, but without a monitoring photodiode, a laser driver controlled by a controller IC for driving the laser diode to generate a laser beam, and a thermal sensor for sensing temperature of the laser diode. The method includes executing an approximation process to characteristic data, i.e.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: October 7, 2014
    Assignee: Alpha Networks Inc.
    Inventor: Wei-Hung Tsai
  • Patent number: 8855496
    Abstract: A method and apparatus conduct an optical clock rate negotiation to support asymmetric clock rates for visible light communication (VLC) in a VLC device. A first frame that includes a receiver clock rate supported by a first VLC device is transmitted at a predetermined clock rate. A response frame that includes a receiver clock rate supported by a second VLC device is received from the second VLC device. A transmission clock rate of the first VLC device is selected based on the response frame from the second VLC device. Subsequent frames for data communication are transmitted to the second VLC device at the selected transmission clock rate of the first device. Alternatively, when conducting optical clock negotiation in the PHY layer, multiple clock rates are supported within a single frame.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: October 7, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Eran Pisek, Farooq Khan, Ying Li
  • Patent number: 8842985
    Abstract: Reliable data transmission is secured without inviting large design changes by means of configuring an optical data transmission device in a manner so as to be provided with: data conversion units and optical communication control units that transmit to each of a first communication unit and a second communication unit disposed movably relative to one another an optical signal modulated in response to wired-line data input from a wired line, and that output wired-line data demodulated from the received optical signal to the wired line; a bit data input unit that receives input of bit data for emergency stops; a bit data output unit that outputs bit data for emergency stops; and bit data communication control units that control in a manner so as to transmit/receive input bit data via the optical communication control units using optical signals that are isolated from the optical signal corresponding to the wired-line data.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: September 23, 2014
    Inventors: Masanori Hino, Yoji Maejima