Patents Examined by Mohammad R Sedighian
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Patent number: 10367586Abstract: In some embodiments, an apparatus includes a quadrature amplitude modulation (QAM) optical modulator which includes a first phase modulator (PM), a second PM, a tunable optical coupler (TOC), and an optical combiner (OC). The TOC is configured to split a light wave at an adjustable power splitting ratio to produce a first split light wave and a second split light wave. The first PM is configured to modulate the first split light wave in response to a first multi-level electrical signal to produce a first modulated light wave. The second PM is configured to modulate the second split light wave in response to a second multi-level electrical signal to produce a second modulated light wave. The OC is then configured to combine the first modulated light wave and the second modulated light wave to generate a QAM optical signal.Type: GrantFiled: September 1, 2016Date of Patent: July 30, 2019Assignee: Juniper Networks, Inc.Inventors: Yang Yue, Bo Zhang, Qiang Wang
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Patent number: 10355804Abstract: An integrated apparatus with optical/electrical interfaces and protocol converter on a single silicon substrate. The apparatus includes an optical module comprising one or more modulators respectively coupled with one or more laser devices for producing a first optical signal to an optical interface and one or more photodetectors for detecting a second optical signal from the optical interface to generate a current signal. Additionally, the apparatus includes a transmit lane module coupled between the optical module and an electrical interface to receive a first electric signal from the electrical interface and provide a framing protocol for driving the one or more modulators. Furthermore, the apparatus includes a receive lane module coupled between the optical module and the electrical interface to process the current signal to send a second electric signal to the electrical interface.Type: GrantFiled: July 13, 2018Date of Patent: July 16, 2019Assignee: INPHI CORPORATIONInventor: Radhakrishnan L. Nagarajan
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Patent number: 10345673Abstract: Embodiments of this disclosure provide a bias control apparatus and method of a modulator of an optical transmitter and an optical transmitter. By obtaining respective output power signals of a first Mach-Zehnder modulator and a second Mach-Zehnder modulator constituting the modulator of the optical transmitter, information on a phase bias may be extracted according to the two output power signals and an overall output power signal of the modulator of the optical transmitter, so as to control the phase bias by using the information, thereby efficiently improving a sensitivity of the control of the bias, and being applicable to various types of modulation formats.Type: GrantFiled: April 13, 2018Date of Patent: July 9, 2019Assignee: FUJITSU LIMITEDInventors: Yangyang Fan, Zhenning Tao
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Patent number: 10299021Abstract: A method for optical signal amplification in an optical communication system is presented. The optical communication system comprises an optical line terminal, a plurality of optical network units, an optical splitter and a plurality of circulators. The optical network units comprise each an optical amplifier. A first optical signal is sent in a downstream direction from the optical line terminal to a first circulator from the plurality of circulators. The first optical signal is further sent from the first circulator to a first optical network unit from the plurality of optical network units and it bypasses the optical splitter. The first optical signal is amplified in the optical amplifier of the first optical network unit to generate an amplified optical signal. The amplified optical signal is sent from the first optical network unit to the first circulator through the optical splitter and is further sent from the first circulator to a further of the plurality of optical network units.Type: GrantFiled: April 21, 2016Date of Patent: May 21, 2019Assignee: ALCATEL LUCENTInventors: Wolfgang Poehlmann, Rene Bonk
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Patent number: 10295751Abstract: A method and network are provided for a reconfigurable optical sensor network. The method includes configuring, by a controller, the reconfigurable optical sensor network, including one or more reconfigurable optical space switches, for a type of sensor data. The method also includes generating sensor data in the type of sensor data with one or more of a plurality of bidirectional sensors. The method additionally includes sending the sensor data to one or more optical star couplers. The method further includes forwarding the sensor data from one of the one or more optical star couplers to the one of one or more reconfigurable optical space switches.Type: GrantFiled: February 28, 2018Date of Patent: May 21, 2019Assignee: NEC CorporationInventors: Ivan B. Djordjevic, Shaoliang Zhang, Ting Wang
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Patent number: 10298322Abstract: In some embodiments, a non-transitory processor-readable medium storing code representing instructions to be executed by a processor comprises code to cause the processor to determine, during a calibration of a coherent optical transmitter, a set of parameters associated with each tributary channel by sending a first signal to a digital signal processor (DSP) to adjust a scale factor of that tributary channel. The scale factor is associated with a tap characteristic of a finite impulse response (FIR) filter of the DSP. The code further causes the processor to determine a power imbalance between two tributary channels based on the set of parameters associated with each tributary channel. The code further causes the processor to send a second signal to the coherent optical transmitter to adjust a set of operational settings of the coherent optical transmitter based on the power imbalance and the set of parameters associated with each tributary channel.Type: GrantFiled: April 27, 2018Date of Patent: May 21, 2019Assignee: Juniper Networks, Inc.Inventors: Qiang Wang, Yang Yue, Xuan He
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Patent number: 10291324Abstract: An optoelectronic transceiver includes an optoelectronic transmitter, an optoelectronic receiver, memory, and an interface. The memory is configured to store digital values representative of operating conditions of the optoelectronic transceiver. The interface is configured to receive from a host a request for data associated with a particular memory address, and respond to the host with a specific digital value of the digital values. The specific digital value is associated with the particular memory address received from the host. The optoelectronic transceiver may further include comparison logic configured to compare the digital values with limit values to generate flag values, wherein the flag values are stored as digital values in the memory.Type: GrantFiled: February 21, 2017Date of Patent: May 14, 2019Assignee: Finisar CorporationInventors: Lewis B. Aronson, Lucy G. Hosking
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Patent number: 10291387Abstract: The present invention pertains to a method for configuring an infrared audio transmission system comprising a signal generator and a plurality of radiators connected to said signal generator, the method comprising at least one of said plurality of radiators: receiving (1050) a delay compensation configuration message; and storing (1060) an amount of delay to be introduced into subsequently radiated signals in accordance with the received delay compensation configuration message. The invention also pertains to a configuration node (100) for configuring radiators in such a system, configured to: transmit (1010) at least one test signal to the radiators; detect (1020) events triggered by the test signal; determine (1030) respective transmission delays between the node and the radiators on the basis of these reflections; and transmit (1040) a delay compensation configuration message over said network, the delays being included in the delay compensation configuration message.Type: GrantFiled: April 7, 2016Date of Patent: May 14, 2019Assignee: Televic Conference NVInventor: M. Tracy Alan Bathurst
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Patent number: 10284304Abstract: A SDH receiver which comprises a first polarization beam splitter 11, a second polarization beam splitter 13, a first separator 15, a second separator 17, a third separator 19, a fourth separator 21, a first 90-degree polarization rotor 23, a second 90-degree polarization rotor 25, a first hybrid detector 31, a second hybrid detector 33, a third hybrid detector 35, a fourth hybrid detector 37, and a signal processor 39.Type: GrantFiled: April 10, 2015Date of Patent: May 7, 2019Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Luis Ruben Soares, Ben Puttnam, Mendinueta Jose Manuel Delgado, Yoshinari Awaji, Naoya Wada
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Patent number: 10263712Abstract: An optical communications apparatus includes a subsea cable, first and second landing stations, a splitter/combiner unit connected to an end of the subsea cable, and first and second legs connecting the splitter/combiner unit to the first and second landing stations, respectively. Each of the subsea cable and first and second legs includes an optical fiber configured to carry optical communications and an electrical conductor configured to carry electrical power. The splitter/combiner unit is configured to duplicate optical signals carried by the subsea cable in both the first and second legs. The first and second legs are configured to provide redundant electrical power connections to the subsea cable via the splitter/combiner unit.Type: GrantFiled: June 1, 2018Date of Patent: April 16, 2019Assignee: Neptune Subsea IP LimitedInventors: Stephen Desbruslais, Alistair Hill
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Patent number: 10257594Abstract: A device and method for controlling light by wavelength in a device with a switch plane and a dispersion plane uses optics providing an imaging function in the dispersion plane, and a Fourier transform function in the switch plane, so as to enable crosstalk to be reduced.Type: GrantFiled: August 15, 2013Date of Patent: April 9, 2019Assignee: Thomas Swan and Co., Ltd.Inventors: Melanie Holmes, Adrian Perrin Janssen
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Patent number: 10256939Abstract: A single-wavelength light path is selected between a source access node and a destination access node of a wavelength-division multiplexed optical network, including selecting an illuminated wavelength of the light path and selecting a start time and duration for a data transfer that would not interfere with other data transfers. If no start time/wavelength combination is available with duration sufficient to transport the data, an additional wavelength is automatically selected, based on modeling, that would not impair traffic being carried by other wavelengths in the network, and without a time-consuming manual process of the prior art. The scheduling process may include selecting a set of optical fibers, a wavelength, a start time and an end time to transport proposed traffic. A novel scheduler avoids checking every possible start time, thereby saving significant processing time. The scheduler schedules single-wavelength light paths, rather than relying on complex wavelength shifting schemes.Type: GrantFiled: July 30, 2018Date of Patent: April 9, 2019Assignee: Massachusetts Institute of TechnologyInventors: Lei Zhang, Vincent W. S. Chan
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Patent number: 10234633Abstract: A four-dimensional multiplexing method and four-dimensional multiplexing system are provided for optical networks. The method includes receiving sensor data to be transmitted on an optical network. The method also includes encoding the sensor data into an optical signal employing one or more multiplexing systems. The method additionally includes transmitting the optical signal over the optical network. The method further includes decoding the optical signal into the sensor data employing the one or more multiplexing systems. The method also includes controlling an operation of a processor-based machine responsive to the sensor data.Type: GrantFiled: February 28, 2018Date of Patent: March 19, 2019Assignee: NEC CorporationInventors: Ivan B. Djordjevic, Shaoliang Zhang, Ting Wang
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Patent number: 10194221Abstract: A high capacity node includes a plurality of receiver sections and a plurality of transmitter sections; and an electrical switching fabric between the plurality of receiver sections and the plurality of transmitter sections, wherein each of the plurality of receiver sections and the plurality of transmitter sections interface the electrical switching fabric at a full signal level and the electrical switching fabric is configured to perform flow switching on the full signal level between respective receiver sections and transmitter sections, and wherein the plurality of receiver sections, the plurality of transmitter sections, and one or more stages of the electrical switching fabric are implemented in one or more optoelectronic integrated circuits.Type: GrantFiled: December 6, 2017Date of Patent: January 29, 2019Assignee: Ciena CorporationInventors: Michael Y. Frankel, John P. Mateosky, Michael H. Shahine, Joseph Berthold
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Patent number: 10185025Abstract: Systems, methods, mobile computing devices and computer-readable media are described herein relating to light-based positioning. In various embodiments, light sources (106) may be commissioned to selectively energize one or more LEDs to emit light carrying a coded light signal. The coded light signal may convey information about a location of a lighting effect (102) projected by the one or more LEDs onto a surface (104). In various embodiments, mobile computing devices (100) such as smart phones or tablets may detect these coded light signals from the lighting effects and/or from the light sources, extract the location information, and utilize it to determine their locations within an environment.Type: GrantFiled: October 31, 2014Date of Patent: January 22, 2019Assignee: PHILIPS LIGHTING HOLDING B.V.Inventors: Dirk Valentinus René Engelen, Bartel Marinus Van De Sluis, Philip Steven Newton, Dzmitry Viktorovich Aliakseyeu
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Patent number: 10033463Abstract: A fiber optic distribution terminal includes a cable spool rotatably disposed within an enclosure; an optical power splitter and a termination region carried by the cable spool; an optical cable deployable from the enclosure by rotating the cable spool by pulling on a connectorized end of the optical cable; and splitter pigtails extending between the optical power splitter and the termination region. One fiber of the optical cable extending between the connectorized end and the splitter input. The other fibers of the optical cable extend to a multi-fiber adapter.Type: GrantFiled: February 18, 2016Date of Patent: July 24, 2018Assignees: ADC Communications (Australia) Pty Limited, CommScope Connectivity Australia Pty Ltd.Inventors: Paul David Hubbard, Wesley Edward Oxlee
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Patent number: 9835800Abstract: A state of polarization (SOP) controller allows a randomly polarized input beam to be converted to a single linear polarization, while transferring substantially all of the power to the output. The input beam is split into orthogonal components and one of the components rotated and a phase difference between the components compensated for. The phase aligned components may then be recombined into a single output. The phase shifters may be reset during a reset period during which the impact on data transmission is reduced.Type: GrantFiled: March 11, 2016Date of Patent: December 5, 2017Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Mohammad Mehdi Mansouri Rad, Hamid Mehrvar, Dominic John Goodwill
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Patent number: 9654213Abstract: A portable apparatus for measuring optical powers of optical signals propagating concurrently in opposite directions in an optical transmission path between two elements, at least one of the elements being operative to transmit a first optical signal (S1) only if it continues to receive a second optical signal (S2) from the other of said elements, comprises first and second connector means for connecting the apparatus into the optical transmission path in series therewith, and propagating and measuring means connected between the first and second connector means for propagating at least the second optical signal (S2) towards the one of the elements, and measuring the optical powers of the concurrently propagating optical signals (S1, S2). The measurement results may be displayed by a suitable display unit. Where one element transmits signals at two different wavelengths, the apparatus may separate parts of the corresponding optical signal portion according to wavelength and process them separately.Type: GrantFiled: March 14, 2016Date of Patent: May 16, 2017Assignee: EXFO Inc.Inventors: Bernard Ruchet, Normand Cyr
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Patent number: 9288558Abstract: A control module for an optical switch node, comprising a TIM having a plurality of operating modes in which a first mode is identified by a first byte sequence; a communication interface unit transmitting a second byte sequence for placing the TIM in the first mode, the first byte sequence different from the second byte sequence, and a gate array receiving the second byte sequence, storing a list of predetermined unique values, each value indicative of a particular operating mode command, receiving at least a portion of the second byte sequence and receiving instructions to apply an algorithm to at least a portion of the second byte sequence to transform the portion into a checksum value, comparing the checksum value to the list to determine the operating mode command, and transmitting the first byte sequence to the TIM to place the TIM into the first mode.Type: GrantFiled: March 28, 2014Date of Patent: March 15, 2016Assignee: Infinera CorporationInventors: Soven Kumar Dana, Chander Prakash Singh Dogra, Sandeep Kumar, Eric Heistermann
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Patent number: 8295699Abstract: A device may include a first optical port configured to receive an optical signal and a demultiplexer to spatially separate the optical signal into multiple optical signals. Each of the multiple optical signal may have a different carrier wavelength. The device may also include a switch element with plasmons. The switch element may receive one of the multiple optical signals, direct the received one of the multiple optical signals, and couple energy of the plasmons to energy of the directed optical signal. The device may further include a second optical port. The second optical port may receive the directed optical signal with the coupled energy of the plasmons, and transmit the received, directed optical signal.Type: GrantFiled: December 28, 2009Date of Patent: October 23, 2012Assignee: Verizon Patent and Licensing Inc.Inventors: Roman Egorov, Stuart Elby