Raman Or Brillouin Process Patents (Class 359/334)
  • Patent number: 10313020
    Abstract: An apparatus includes a remote optically pumped amplifier (ROPA). The ROPA includes a bypass filter configured to receive an optical signal and first pump power and to separate the optical signal and the first pump power. The ROPA also includes an amplifier configured to receive the optical signal from the bypass filter and to amplify the optical signal. The ROPA further includes an optical combiner/multiplexer configured to receive the first pump power from the bypass filter, receive at least second and third pump powers, combine at least two of the first, second and third pump powers, and provide different pump powers or combinations of pump powers to different locations within the ROPA to feed the amplifier.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: June 4, 2019
    Assignee: Neptune Subsea IP Limited
    Inventors: Do-Il Chang, Philippe Andre Perrier, Herve A. Fevrier
  • Patent number: 10270536
    Abstract: Methods, systems, and apparatus for phase-sensitive regeneration of a signal without a phase-locked loop and using Brillouin amplification. The system for phase-sensitive regeneration includes a data channel, one or more pumps and a mixing stage. The one or more pumps are coupled with the data channel. The mixing stage is coupled with the data channel and is for processing a data signal that is combined with an output of the one or more pumps and idler or higher harmonic. The mixing stage is configured to amplify the idler or higher harmonic using Brillouin amplification in a Brillouin gain medium to keep the one or more pumps and the data channel phase-locked.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: April 23, 2019
    Assignee: UNIVERSITY OF SOUTHERN CALIFORNIA
    Inventors: Ahmed Almaiman, Alan E. Willner, Yinwen Cao, Morteza Ziyadi
  • Patent number: 10263386
    Abstract: A Raman pump system for a Raman amplifier includes a plurality of primary Raman pumps each at a corresponding wavelength; and at least one pair of redundant Raman pumps including a primary redundant Raman pump at a primary wavelength and a secondary redundant Raman pump at a secondary wavelength, wherein only one of the primary redundant Raman pump and the secondary redundant Raman pump is employed based on a zero dispersion wavelength location of a fiber over which the Raman pump system operates. The secondary wavelength can be separated from the primary wavelength by at least 2 nm or 3 nm and no more than 10 nm. The Raman pump system can provide amplification across both the C Band and the L Band.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: April 16, 2019
    Assignee: Ciena Corporation
    Inventors: Balakrishnan Sridhar, Jean-Luc Archambault, Loren Berg
  • Patent number: 10250326
    Abstract: The embedded apparatus disclosed herein may measure reflection coefficient values associated with back reflections in a fiber optics transmission system during a variable detection window to detect normal conditions, simulated Brillouin scattering (SBS), or excessive back reflections triggering remedial action. For example, the back reflections may indicate normal conditions if the reflection coefficients measured during an entire detection window remained below a threshold or a maximum reflection coefficient observed therein was below the threshold. Alternatively, the back reflections may trigger remedial action if the reflection coefficients measured in the entire detection window exceeded the threshold or a minimum reflection coefficient observed therein was above the threshold.
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: April 2, 2019
    Assignee: Ciena Corporation
    Inventors: Jun Bao, Joseph F. Ferment, III, Hua Jiao, Jean-Luc Archambault
  • Patent number: 10230463
    Abstract: A transmitter generates a frequency-modulated CW light so as to transmit it to a path. A receiver receives the CW light that has passed through passband filters included in the path. The receiver includes a processor. The processor measures an optical power of the received CW light every time a center frequency of the CW light is changed and transmitted by the transmitter. The processor calculates transmission characteristics of the CW light that has passed through the passband filters, on the basis of an average value of the optical power that corresponds to a center frequency of the CW light and on the basis of an amplitude component that indicates an amount of change in the optical power, the average value and the amplitude component being obtained as a result of the measurement.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: March 12, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Guoxiu Huang, Yasuhiko Aoki, Shoichiro Oda, Zhenning Tao, Setsuo Yoshida, Kyosuke Sone
  • Patent number: 10193629
    Abstract: In an optical network system: control light is generated by optical modulation based on a modulated data signal which is generated by modulation of a carrier signal with a data signal; and the control light is optically combined with an optical carrier which is to propagate through a nonlinear optical medium, so as to cause cross phase modulation of the optical carrier with the control light in the nonlinear optical medium.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: January 29, 2019
    Assignee: FUJITSU LIMITED
    Inventor: Shigeki Watanabe
  • Patent number: 10186826
    Abstract: The present application describes a method for controlling an output of a laser apparatus. The method includes a step of receiving, at the first multiplexer, an initial wavelength from a pump. The method also includes a step of receiving first and second seed wavelengths from a first and a second seed source, respectively. The method also includes a step of sending an output of the combiner to a first fiber. The method includes a step of combining, at a second multiplexer, an output of the first fiber. The method also includes a step of extracting the initial wavelength with the second multiplexer. Further, the method includes a step of sending the first and seed wavelengths to a second fiber.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: January 22, 2019
    Assignee: LGS Innovations LLC
    Inventor: Stephan Frank Wielandy
  • Patent number: 10154422
    Abstract: Methods and systems are disclosed which allow testing essential performance parameters of broadband communications systems, while using test channels of lower bandwidth, allowing thus lower cost hardware (or use of legacy test system). In particular, the methods and systems allow testing of EVM in digital systems, especially OFDM systems. The methods and systems readily apply to test equipment for production lines, such as IC testers of final product testers.
    Type: Grant
    Filed: October 11, 2016
    Date of Patent: December 11, 2018
    Assignee: VAYYAR IMAGING LTD.
    Inventor: Naftali Chayat
  • Patent number: 10142026
    Abstract: A Raman pumping arrangement for amplifying a data optical signal (40) has a Raman pump (12) for generating a Raman pump signal (44;45), an optical supervisory channel receiver (14) for receiving an optical supervisory channel signal (42) an amplification fiber (15) arranged such that the data optical signal (40), the optical supervisory channel signal (42), and the Raman pump signal (44;45) are transmitted therethrough; and a control unit (13) configured for controlling the operation of the Raman pump (12); wherein the control unit (13) is configured for setting the Raman pump (12) in an operation mode or a start-up mode; wherein in the operation mode, the Raman pump (12) provides an operation pumping power (120), and wherein in the start-up mode, the Raman pump (12) provides a start-up pumping power (122).
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: November 27, 2018
    Assignee: Xieon Networks S.a.r.l.
    Inventor: Lutz Rapp
  • Patent number: 10135525
    Abstract: The present invention provides a fiber-cut detection method, apparatus, and system. When a fiber cut occurs, power of input signal light decreases quickly at a fiber-cut location. When the fiber-cut location is relatively far away from an amplifier, pump light consumption of the input signal light in the remaining fiber reduces due to reduction of the input signal light, which causes an increase of remaining pump optical power in the fiber and an increase of an actual gain value of the amplifier. A gain-locking function of the amplifier works, which decreases pump power of the pump light and maintains a gain of the amplifier unchanged basically. Output optical power of the amplifier decreases quickly with decrease of input optical power, and when power of an output optical signal decreases to power that is lower than preset power of the output optical signal, it is determined that a fiber cut occurs.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: November 20, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yansui Huang, Enbo Zhou
  • Patent number: 10050702
    Abstract: Techniques are described for determining, with a first optical node, a correction factor indicative of an amount of optical power loss that a Raman amplifier in a second optical node causes in an optical signal having a first wavelength that is transmitted by the first optical node and received by the second optical node, transmitting, with the first optical node to the second optical node, information, based on the determined correction factor, that is to be used for determining a gain of the Raman amplifier, and transmitting, with the first optical node to the second optical node, an optical signal having a second wavelength that is to be amplified by the Raman amplifier.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: August 14, 2018
    Assignee: Juniper Networks, Inc.
    Inventors: Qiang Wang, Yang Yue, Bo Zhang
  • Patent number: 9998806
    Abstract: A method for overlapping spectrum amplification includes receiving an optical signal and splitting the optical signal into a first split signal having a first wavelength band and a second split signal having a second wavelength band. The splitting results in a band gap between the first wavelength band and the second wavelength band. The method further includes delaying the first split signal by a threshold period of time relative to the second split signal and combining the first split signal and the second split signal, resulting in a combined signal having the first wavelength band and the second wavelength band without the band gap therebetween. The path difference between the first split signal along the first signal path and the second split signal along the second signal path is within a threshold multipath interference compensation range.
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: June 12, 2018
    Assignee: Google LLC
    Inventors: Valey Kamalov, Vijayanand Vusirikala, Vinayak Dangui
  • Patent number: 9997887
    Abstract: Fiber Bragg gratings (FBG) may be used to perform phase adjustment for optimal phase-sensitive amplification. Specifically, FBGs may be used between the idler stage and the amplification stage of an optical phase-sensitive amplifier for phase shifting or tuning. The phase shifting or tuning may be applied to at least one of an input optical signal, an idler signal, and an optical pump. A feedback control loop may be used in the phase-sensitive optical amplifier with respect to an output optical signal for optimal phase adjustment.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: June 12, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Youichi Akasaka, Tadashi Ikeuchi
  • Patent number: 9998223
    Abstract: Embodiments of the present disclosure provide a calculating apparatus and method for nonlinear weighting coefficient. The calculating apparatus for nonlinear weighting coefficient includes: an approximation processing unit configured to use a rational function to perform approximation processing on a link loss/gain function in intra-channel nonlinear distortion estimation; and a coefficient calculating unit configured to calculate a nonlinear weighting coefficient in the nonlinear distortion estimation by using the approximated link loss/gain function and a large dispersion approximation, to obtain an analytical closed solution of the nonlinear weighting coefficient. With the embodiments of the present disclosure, a weighting coefficient of high precision may be obtained, thereby performing high-precision estimation on nonlinear distortion in case of loss.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: June 12, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Ying Zhao, Liang Dou, Zhenning Tao
  • Patent number: 9985726
    Abstract: Systems and methods for an optical controller in an optical network for photonic control include monitoring signal output of the optical controller for fluctuations on a signal, wherein the optical controller may operate with one or more upstream optical controllers in the optical network which may cause the fluctuations; and initiating a control loop by the optical controller on the signal based on the monitored fluctuations. The initiating is based on one or more thresholds used to differentiate actions of the one or more upstream optical controllers of the plurality of optical controllers from one or more of fiber faults, natural fluctuations in fiber plant, and natural fluctuations in hardware.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: May 29, 2018
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, Dave C. Bownass, Scott Kohlert
  • Patent number: 9977268
    Abstract: An optical processing system providing a rapid optical response, the system including: a first optical material sensitive to an effective refractive index change under photon absorption; a first optical pump for optically pumping the first optical material at a first frequency so as to cause the first optical material to undergo an effective refractive index change by means of photon absorption; a second optical pump for optically pumping the first optical material at a second frequency so as to cause the first optical material to undergo a rapid second refractive index change by means of stimulated emission.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: May 22, 2018
    Assignee: The University of Sydney
    Inventors: Jeffrey Mandryk, Xiaoke Yi, Anish Lamichhane
  • Patent number: 9837784
    Abstract: A pulse shaper includes a seed laser situated to emit laser pulses, an amplitude modulator situated to receive one or more laser pulse bursts from the seed laser, and a pulse signal generator situated to send a seed pulse signal with a predetermined delay to the seed laser so that the seed laser emits the laser pulses in one or more laser pulse bursts at a selected frequency with each laser pulse burst having a selected number of laser pulses and a selected temporal spacing between laser pulses in the laser pulse burst and situated to send an amplitude pulse signal so that the amplitude modulator adjusts the amplitude of at least one laser pulse in each laser pulse burst.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: December 5, 2017
    Assignee: nLIGHT, Inc.
    Inventors: Tyson Lowder, Timothy N. Kutscha, Dennis McCal, Timothy S. McComb, Jared Green
  • Patent number: 9835532
    Abstract: A laser ablation tomography system includes a specimen stage for supporting a specimen. A specimen axis is defined such that a specimen disposed generally on the axis may be imaged. A laser system is operable to produce a laser sheet in a plane intersecting the specimen axis and generally perpendicular thereto. An imaging system is operable to image the area where the laser sheet intersects the specimen axis.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: December 5, 2017
    Assignee: The Penn State Research Foundation
    Inventors: Benjamin Hall, Jonathan Lynch, Edward W. Reutzel, Galen Lynch, Brian T. Reinhardt
  • Patent number: 9838136
    Abstract: An apparatus includes a remote optically pumped amplifier (ROPA). The ROPA includes a bypass filter configured to receive an optical signal and first pump power and to separate the optical signal and the first pump power. The ROPA also includes an amplifier configured to receive the optical signal from the bypass filter and to amplify the optical signal. The ROPA further includes an optical combiner/multiplexer configured to receive the first pump power from the bypass filter, receive at least second and third pump powers, combine at least two of the first, second and third pump powers, and provide different pump powers or combinations of pump powers to different locations within the ROPA to feed the amplifier.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: December 5, 2017
    Assignee: Neptune Subsea IP Limited
    Inventors: Do-Il Chang, Philippe Andre Perrier, Herve A. Fevrier
  • Patent number: 9831976
    Abstract: An optical transmission apparatus for transmitting wavelength-multiplexed light, the optical transmission apparatus includes: an optical transmitter configured to transmit light of a third wavelength to be arranged between a first wavelength and a second wavelength adjacent to the third wavelength in the wavelength-multiplexed light, and a controller configured to control a bandwidth of the light of the third wavelength to be arranged in a first bandwidth narrower than a spacing between the first wavelength and the second wavelength.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: November 28, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Yuji Kamura, Yoshinori Tochiki, Taku Saito
  • Patent number: 9812841
    Abstract: There is provided a laser system that may include a Raman cell, a pumping light generator, and a Raman cell laser unit. The pumping light generator may include one or more optical parametric amplifiers (OPAs), and may be configured to output first Raman-cell pumping light and second Raman-cell pumping light to the Raman cell. The Raman cell laser unit may be configured to output probing light as a target of wavelength conversion to the Raman cell.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: November 7, 2017
    Assignee: Gigaphoton Inc.
    Inventors: Takashi Onose, Kouji Kakizaki, Osamu Wakabayashi
  • Patent number: 9800013
    Abstract: A Raman pump laser control apparatus comprises a wavelength division multiplexer, a tap coupler, a photoelectric detector, an analog amplification processing circuit, an analog-to-digital converter, a fast Raman pump control unit, an digital-analog converter, and a Raman pump laser. The fast Raman pump control unit, after having known anticipated output light power of the Raman pump laser, based on a direct relationship between a current anticipated output light power of the Raman pump laser and input digital quantity that is needed by the digital-analog converter, uses a feedforward control mechanism so that actual output light power of the Raman pump laser fastly approximates the anticipated output light power thereof, and then synchronously combines with a feedback control mechanism so that the actual output light power of the Raman pump laser is precisely locked on the anticipated output light power, thereby achieving fast and precise control of the Raman pump laser.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: October 24, 2017
    Assignees: Accelink Technologies Co., Ltd., Accelink Electronic Technology Co., Ltd
    Inventors: Tao Xiong, Chengpeng Fu, Menghui Le, Jintao Tao, Yunyu Jing, Qinlian Bu, Chunping Yu
  • Patent number: 9793998
    Abstract: An optical transmit system, including a direct modulator configured to generate an optical signal, an optical amplifier coupled to the direct modulator configured to amplify the optical signal output by the direct modulator, and a stimulated Brillouin scattering component coupled to the optical amplifier configured to limit optical power of the optical signal output by the optical amplifier, where a stimulated Brillouin scattering threshold of the stimulated Brillouin scattering component is equal to minimum optical power of a part, which needs to be limited, of the optical signal output by the optical amplifier, and the stimulated Brillouin scattering component reflects, using a stimulated Brillouin scattering frequency difference, a part, which has optical power higher than the minimum optical power, of the optical signal output by the optical amplifier in order to limit outputting of this part of the optical signal.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: October 17, 2017
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Min Zhou, Huafeng Lin, Lei Zhou, Zhenxing Liao
  • Patent number: 9785033
    Abstract: A device for the generation of supercontinuum in infrared fiber with a pump light comprising a microchip laser operating with a wavelength of 1.0 ?m or greater that can be wavelength shifted though a nonlinear element to a wavelength beyond the two-photon absorption of the infrared fiber and launched into infrared fiber whereby the spectrum is broadened in the infrared fiber through various nonlinear processes to generate a supercontinuum within the mid-IR from 2 to 14 ?m.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: October 10, 2017
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Rafael R. Gattass, Jasbinder S. Sanghera, L. Brandon Shaw
  • Patent number: 9780521
    Abstract: The present application describes a multi wavelength apparatus. The apparatus includes a pump laser, a first seed laser and a second seed laser. Each of the first and second seed lasers had wavelengths longer than the pump laser. The apparatus also includes a first multiplexer. The apparatus also includes first and second controllers configured to respectively control outputs of the first and second seed lasers. The apparatus also includes a first fiber configured to receive an output of a first multiplexer. The apparatus also includes a second multiplexer configured to receive the output of the first fiber. The apparatus also includes a second fiber configured to receive the output of the second combiner. The second fiber can emit light at either the first seed wavelength or the second seed wavelength. The present application is also directed to a method for controlling an output of a laser apparatus.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: October 3, 2017
    Assignee: LGS INNOVATIONS LLC
    Inventor: Stephan Frank Wielandy
  • Patent number: 9768582
    Abstract: The embodiments of the present invention disclose a method and an apparatus for determining a gain of a Raman optical amplifier and a Raman optical amplifier. The method includes: acquiring present gain parameter information of a Raman optical amplifier; and determining a present gain of a monitoring channel of the Raman optical amplifier according to the present gain parameter information and a correspondence between a gain of the monitoring channel of the Raman optical amplifier and gain parameter information. According to the method and apparatus for determining a gain of a Raman optical amplifier and the Raman optical amplifier that are in embodiments of the present invention, a present gain of a monitoring channel can be accurately determined; therefore, a gain spectrum of the Raman optical amplifier can be accurately monitored, and the gain of the Raman optical amplifier can be accurately adjusted to a target gain.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: September 19, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yansui Huang, Enbo Zhou
  • Patent number: 9762319
    Abstract: Techniques are described for determining, with a first optical node, a correction factor indicative of an amount of optical power loss that a Raman amplifier in a second optical node causes in an optical signal having a first wavelength that is transmitted by the first optical node and received by the second optical node, transmitting, with the first optical node to the second optical node, information, based on the determined correction factor, that is to be used for determining a gain of the Raman amplifier, and transmitting, with the first optical node to the second optical node, an optical signal having a second wavelength that is to be amplified by the Raman amplifier.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: September 12, 2017
    Assignee: Juniper Networks, Inc.
    Inventors: Qiang Wang, Yang Yue, Bo Zhang
  • Patent number: 9722559
    Abstract: A hybrid fiber amplifier and method of adjusting gain and gain slope of thereof. The hybrid fiber amplifier comprises: RFA and EDFA that does not comprise variable optical attenuator. The RFA comprises pump signal combiner, pump laser group, out-of-band narrow-band filter, and photodetector. The EDFA comprises input coupler, erbium-doped fiber, output coupler, input photodetector, and output photodetector that are connected in sequence. The hybrid fiber amplifier also comprises control module that coordinates and controls EDFA and/or RFA to adjust gain and/or the gain slope based on desired amplification requirements. The EDFA and/or RFA can be coordinated and controlled by using the control module to achieve desired amplification effect. In addition, the EDFA does not comprise the variable optical attenuator, which avoids problems caused by the variable optical attenuator.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: August 1, 2017
    Assignee: Accelink Technologies Co., Ltd.
    Inventors: Chengpeng Fu, Cuihong Zhang, Tao Xiong, Menghui Le, Jintao Tao, Zhenyu Yu, Yunyu Jing, Qinlian Bu, Chunping Yu
  • Patent number: 9647418
    Abstract: A desired Nth-order Stokes output and zeroth-order Stokes pump input are seeded into a rare-earth doped amplifier where the power of the zeroth-order Stokes signal is amplified prior to both signals entering a Raman amplifier comprised of N?1 Raman resonators, each uniquely tuned to one of the N?1 Stokes orders, in various configurations to include one or more nested and/or in-series Raman resonators. The zeroth-order Stokes signal is converted to the Nth?1-order Stokes wavelength in steps and the power level of the Nth-order Stokes wavelength is amplified as the two signals propagate through the Raman resonators. Each Raman resonator includes a photosensitive Raman fiber located between a pair of Bragg gratings. The linewidths of the Stokes orders can be controlled by offsetting the reflectivity bandwidths of each pair of Bragg gratings respectively located in the Raman resonators.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: May 9, 2017
    Assignee: THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE
    Inventors: Leanne J. Henry, Thomas M. Shay, Gerald T. Moore, Jacob R. Grosek
  • Patent number: 9641276
    Abstract: An optical line terminal (OLT) in a time and wavelength division multiplexed (TWDM) passive optical network (PON). The OLT comprises a first optical port, a second optical port, and a processor. The first optical port is configured to couple to a plurality of optical network units (ONUs) via an optical distribution network (ODN). The second optical port is configured to couple to the ONUs via the ODN. The processor is coupled to the first optical port and the second optical port and is configured such that, responsive to receiving information indicating that the first optical port has experienced a greater power loss over time than the second optical port, the OLT assigns to the first optical port a first wavelength with a power greater than the power of a second wavelength assigned to the second optical port.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: May 2, 2017
    Assignee: Futurewei Technologies, Inc.
    Inventors: Frank J. Effenberger, Lei Zong, Dekun Liu
  • Patent number: 9634458
    Abstract: A laser system and method of use are provided in which the laser system may include a fiber laser oscillator and rare earth doped piece of optical fiber which may absorb unused pump light which is unabsorbed in the oscillator.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: April 25, 2017
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Benjamin R. Johnson, Daniel J. Creeden
  • Patent number: 9634788
    Abstract: Consistent with the present disclosure, an optical communication system is provided in which client data is input to a first node and output from a second node, spaced from the first node, with little delay. In one example, the delay is reduced by including higher order Raman amplifiers that provide a substantially uniform gain along the length of a fiber optic link, thereby reducing the number of EDFAs that may otherwise be installed along the optical fiber link or eliminating such EDFAs entirely. In another example, FEC encoding and decoding are not employed, thereby reducing the delay even further.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: April 25, 2017
    Assignee: Infinera Corporation
    Inventors: Paul R. Morkel, David F. Welch
  • Patent number: 9621263
    Abstract: The present invention discloses a method and an apparatus for detecting an optical signal-to-noise ratio, a node device, and a network system. The method includes: receiving a detected optical signal carrying amplified spontaneous emission ASE noise; detecting a first alternating current component and a first direct current component of the detected optical signal; acquiring first modulation information of the detected optical signal; acquiring first correction information corresponding to the first modulation information according to the first modulation information; and determining an optical signal-to-noise ratio OSNR of the detected optical signal according to the first alternating current component, the first direct current component, and the first correction information.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: April 11, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yijia Wei, Juan Ni, Zhiyong Feng, Ning Deng
  • Patent number: 9601900
    Abstract: An optical amplifier assembly for determining a parameter of an optical fiber configured to amplify an optical signal being propagated therethrough, the assembly comprising: at least one amplifier pump light source assembly configured to transmit light at a plurality of wavelengths into the optical fiber; a receiver configured to receive light that has propagated through at least part of the optical fiber; and a processor configured to determine the parameter of the optical fiber based on the received light.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: March 21, 2017
    Assignee: II-VI INCORPORATED
    Inventors: Ian Peter McClean, Manish Sharma
  • Patent number: 9575390
    Abstract: An optical fiber is optically coupled to an optical multiplexer. First and second wavelength-selective reflectors are formed onto the optical fiber. The first wavelength selective reflector is configured to reflect radiation of a first wavelength and the second wavelength reflective selector is configured to reflect radiation of a second wavelength that is longer than the first wavelength. A resonant laser cavity is formed between transmission fiber acting as distributed Rayleigh mirror and first and second wavelength selective reflectors. The first and second wavelength-selective reflectors and the optical fiber are configured such that Raman scattering and gain in the transmission fiber converts pump radiation at a pump wavelength less than the first wavelength to radiation of the first wavelength and also convert radiation of the first wavelength to radiation of the second wavelength.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: February 21, 2017
    Assignee: IPG PHOTONICS CORPORATION
    Inventors: Cristiano Mornatta, Alessandro Festa
  • Patent number: 9553674
    Abstract: An optical transmitter includes a circuit that controls a first frequency component and a second frequency component that are contained in an optical signal to be transmitted to be in different polarization states from each other.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: January 24, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Takahito Tanimura, Takeshi Hoshida
  • Patent number: 9525481
    Abstract: The present invention relates to the field of network communications and discloses a method for calculating a nonlinear transmission impairment, including: determining that no pump channel exists in an optical fiber link, obtaining a factor of intra-band nonlinear noise that does not pass through an optical filter, and obtaining integral power in signal light bandwidth of a span; correcting the factor of intra-band nonlinear noise that does not pass through an optical filter, to obtain a factor of intra-band nonlinear noise of the span that passes through an optical filter; calculating nonlinear noise of the span; and obtaining total nonlinear noise of the optical fiber link according to the nonlinear noise of the span, and obtaining a nonlinear transmission impairment of the optical fiber link. Embodiments of the present invention further provide an apparatus for calculating a nonlinear transmission impairment of an optical fiber link.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: December 20, 2016
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Sen Zhang, Enbo Zhou, Yabin Ye
  • Patent number: 9508572
    Abstract: A boding device includes a light guiding part that guides laser beam oscillated from a laser oscillator, a bonding head that heats a chip with the laser beam, and a bonding head moving part that moves the bonding head between a supply position and a bonding position. The laser oscillator is separated from the bonding head. The light guiding part includes an irradiation barrel that is provided in the vicinity of the bonding position and, a shutter part that is provided in the irradiation barrel, and a light receiving part that is provided in the bonding head and guides the laser beam to the chip. When the bonding head moving part moves the bonding head to the bonding position, the shutter part is opened so that the laser beam from the irradiation barrel is guided to the bonding head through the light receiving part.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: November 29, 2016
    Assignee: SHIBUYA KOGYO CO., LTD.
    Inventor: Hiroyuki Yasuyoshi
  • Patent number: 9509430
    Abstract: Apparatus for amplifying signal such as a burst mode signal in an optical network. A doped fiber, for example an erbium-doped fiber is placed in a preferably passive module along an optical data transmission path. A pump port is optically connected to at least one combiner such as a WDM (wavelength division multiplexor) that is placed along the optical transmission path to add in a pump wavelength in the vicinity of the doped fiber. The apparatus, which is preferably completely passive, may be advantageously placed in communication with a remote pump light source such as a pump laser resident on a management node of the network. A second pump port may be added, as well as one or more detector ports to facilitate operation of a remote control processor, which may also be resident in a management node such as an OLT (optical line terminal) in a PON (passive optical network).
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: November 29, 2016
    Assignee: Alcatel Lucent
    Inventors: Wolfgang Poehlmann, Joseph Lee Smith
  • Patent number: 9502855
    Abstract: A third-order Stokes wavelength seed signal at the desired output wavelength of 1240 nm and a zeroth-order Stokes wavelength signal at 1066 nm are input into a Raman amplifier comprised of two Raman resonators in a linear configuration. The first resonator converts the zeroth-order Stokes wavelength signal at 1066 nm into a first-order Stokes wavelength signal at 1118 nm, and also outputs the third-order Stokes wavelength seed signal at 1240 nm. The second resonator then converts the 1118 nm output from the first resonator into a second-order Stokes wavelength signal at 1176 nm, which amplifies the 1240 nm seed signal power level. Each Raman resonator includes a photosensitive Raman fiber communicating with a plurality of high-reflector Bragg gratings. The linewidths of the second and third Stokes orders are controlled by adjusting the resonant bandwidth of the second Raman resonator by offsetting the respective center wavelengths of the high-reflector Bragg gratings.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: November 22, 2016
    Assignee: THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE
    Inventors: Leanne J. Henry, Thomas M. Shay, Gerald T. Moore, Jacob R. Grosek
  • Patent number: 9479257
    Abstract: A method includes: selecting an optical pump signal power of a Raman amplifier such that a saturated gain of the Raman amplifier is at a maximum operating level without exceeding a gain threshold above which an optical signal to noise ratio penalty is no longer negligible in the Raman amplifier; selecting an optical signal power for at least one optical communication signal to be transmitted across the optical link to maximise a Q-factor of the optical signal when the Raman amplifier is configured for said maximum operating level of the saturated gain; generating a pump signal power control signal to cause an optical pump signal source of the Raman amplifier to generate an optical pump signal having the selected optical pump signal power; and generating a signal power control signal configured to cause the optical communication signal to be delivered into the optical link at the selected optical signal power.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: October 25, 2016
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Jeroen Nijhof, Roberto Magri
  • Patent number: 9455546
    Abstract: An optical fiber carries optical channels injected into the optical fiber to a Raman amplifier. A controller determines a static tilt associated with the channels in the fiber due to wavelength dependent losses. A photodiode measures a total power of the channels at an output of the Raman amplifier. The controller determines a dynamic tilt associated with channels in the fiber based in part on the measured total power. The dynamic tilt is induced by Stimulated Raman Scattering (SRS) in the fiber and varies as a function of a total power of the signals injected into the fiber. The controller determines a total tilt with which to offset the static and dynamic tilts. The controller sets an amplifier gain tilt applied to the channels equal to the total tilt.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: September 27, 2016
    Assignee: Cisco Technology, Inc.
    Inventors: Enrico Griseri, Mauro Brunella, Rosanna Pastorelli, Stefano Piciaccia
  • Patent number: 9417503
    Abstract: A light source emits first incident light to a first polarization-reversed structure. The first polarization-reversed structure then converts the wavelength of the first incident light to emit a higher harmonic wave. A fiber coupler divides the higher harmonic wave output from the first polarization-reversed structure into output light emitted from the light source device and feedback light. The feedback light enters a second polarization-reversed structure. The second polarization-reversed structure then converts the wavelength of the feedback light to emit second incident light. The second incident light has the same wavelength as the first incident light. The second incident light enters a first wavelength converter.
    Type: Grant
    Filed: September 3, 2012
    Date of Patent: August 16, 2016
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Masanori Oto
  • Patent number: 9419409
    Abstract: A single-pump multi-wavelength lasing semiconductor Raman pump laser comprises a thermoelectric cooler arranged in a shell; a heat transition bearing platform arranged in the thermoelectric cooler; a semiconductor Raman pump laser tube core arranged on the heat transition bearing platform; and a coupling lens group, a thermistor and a backlight detector that are arranged on the heat transition bearing platform respectively. The pump laser tube core, the backlight detector, the thermistor and the thermoelectric cooler are electrically connected to pins outside a laser tube shell. A pump combination apparatus comprises a first signal transmission fiber, a pump signal combiner and a second signal transmission fiber that are sequentially connected to each other. An input terminal of the pump signal combiner is connected to an output terminal of an isolated polarization beam combiner and depolarizer.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: August 16, 2016
    Assignee: Accelink Technologies Co., Ltd.
    Inventors: Qinlian Bu, Xiaohui Zou
  • Patent number: 9410246
    Abstract: A graphene coated optic-fiber laser is disclosed that includes a doped inner core and an undoped outer core surrounding the doped inner core. A graphene cylinder or capsule surrounds the undoped outer core, thereby forming a cladding layer around the undoped outer core.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: August 9, 2016
    Inventor: Tyson York Winarski
  • Patent number: 9410866
    Abstract: The present invention relates to a device for monitoring an optical fiber comprising a photo-sensitive device arranged to produce an electric pulse from an optical pulse injected at a first node of the optical fiber, a delay element and a first optical circulator arranged to delay the optical pulse injected at the first node of the optical fiber. Further, the device comprises an optical amplifier arrangement arranged to receive the optical pulse at its input and the produced electric pulse as an operating signal, for producing an amplified optical pulse. Moreover, the device comprises a second optical circulator arranged to receive the amplified optical pulse at a first port and output the amplified optical pulse at a second port connected to a second node of the optical fiber, and to receive an optical signal reflected back from the optical fiber at the second port and outputting the reflected optical signal at a third port.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: August 9, 2016
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Jean Pierre von der Weid, Giancarlo Vilela de Faria
  • Patent number: 9391698
    Abstract: Systems and methods for achieving eye safety of an optical transceiver are provided. An optical module can be configured to output a first optical signal. A first photodetector can be configured to output a signal indicative of a presence or absence of a second optical signal. A controller can be coupled to the optical module and the first photodetector and can be configured to control the output of the optical module. In response to a determination that an output of the first photodetector indicates the second optical signal is absent, the controller can control the optical module to output the first signal at a decreased average optical power. In response to a determination that an output of the first photodetector indicates the second optical signal is present, the controller can control the optical module to output the first signal at an increased average optical power.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: July 12, 2016
    Assignee: Google Inc.
    Inventors: Ryohei Urata, Nathan Folkner, Zuowei Shen
  • Patent number: 9391426
    Abstract: A Raman amplifier includes: a pump light generator that provides a plurality of pump light beams with different wavelengths for an optical transmission medium; a gain monitor that monitors an average Raman gain in the optical transmission medium; a storage unit that stores ratio information indicating a ratio of power of the plurality of pump light beams for a specified gain characteristic with respect to an average Raman gain in the optical transmission medium; and a controller that controls the power of the plurality of pump light beams based on the average Raman gain monitored by the gain monitor and the ratio information.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: July 12, 2016
    Assignee: FUJITSU LIMITED
    Inventor: Tatsuya Tsuzuki
  • Patent number: 9379513
    Abstract: A Raman amplifier comprising a gain control unit adapted to control a pump power of an optical pump signal in response to at least one monitored optical feedback signal reflected back from a transmission line fiber connected to said pumped Raman amplifier.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: June 28, 2016
    Assignee: ADVA Optical Networking SE
    Inventors: Dogan Atlas, Mohammad Taleghani, Mohammad Mahbobzadeh, Kyle Hamilton
  • Patent number: 9350452
    Abstract: An optical signal distribution system is provided herein useful for multiple service operators (MSOs) in providing content data to subscribers, and receiving control and other data from subscribers. The system facilitates the transmission of content data to the subscribers and the control and other data from subscribers substantially in the optical domain. The system includes a head-end configured to transmit the content data via a forward channel optical signal and receive the control data via a composite reverse channel optical signal. The system also includes a signal distribution hub configured to receive and replicate the forward channel optical signal for transmission to optical taps, receive reverse channel optical signals from the optical taps, generate a composite reverse channel optical signal, and transmit the composite reverse channel optical signal. Each optical tap sends and receives the forward and reverse channel optical signals to and from a plurality of subscribers units.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: May 24, 2016
    Assignee: OPTILAB, LLC
    Inventor: Henry H. Hung