Transmitter Patents (Class 398/182)
  • Patent number: 11169337
    Abstract: An optical module includes at least one optical sub-assembly; at least one control circuit configured to control the at least one optical sub-assembly; and a housing including a first case and a second case, wherein the optical module is configured to be plugged in and unplugged from an optical transmission equipment including a heat sink provided at a joining portion with the first case, wherein, through fitting of the first case and the second case, the housing accommodates the at least one optical sub-assembly and the at least one control circuit inside the housing, and wherein a material of the first case has a thermal conductivity higher than a material of the second case.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: November 9, 2021
    Assignee: Lumentum Japan, Inc.
    Inventors: Hiroyoshi Ishii, Tetsuya Aoki, Koichi Takahashi
  • Patent number: 11132552
    Abstract: This invention provides a system and method that employs reduction in bandwidth and the amount of data stored, along with queuing of data, so that the significant and/or relevant shipboard visual information is detected and communicated continuously from the ship (or other remote vehicle/location) to shore without loss of useful/high-priority information and within the available bandwidth of that typical, available satellite link. The system and method supports remote configuration and management from shore to the ship over the same communications channel but in the reverse direction.
    Type: Grant
    Filed: February 12, 2021
    Date of Patent: September 28, 2021
    Assignee: ShipIn Systems Inc.
    Inventors: Ilan Naslavsky, Osher Perry, Moran Cohen, David J. Michael
  • Patent number: 11063669
    Abstract: The present invention relates to a technical field of optical communications. It relates to a dual-rate DML device and module, and a calibration method, and in particular, to a dual-rate DML device and module having a built-in signal calibration circuit, and a calibration method. According to the present invention, the signal calibration circuit is added into the device; a PD is prepositioned by means of a novel light splitting structure; a control structure for a sequence-divided multi-channel serial signal is utilized to feed back a monitoring signal to an electric driver to adjust drive current; crosstalk between backlight monitoring is reduced; and high-quality signal output under dual modulation frequencies of 25 Gbps and 28 Gbps is realized.
    Type: Grant
    Filed: December 25, 2017
    Date of Patent: July 13, 2021
    Inventors: Hongchun Xu, Yangyang Yue, Chenggang Liu, Xiaoping Song, Xue Mei, Hui Zou, Yuan Zhang
  • Patent number: 11057115
    Abstract: An optical communication device includes a plurality of laser sources, a plurality of first meta-lenses, and an optical fiber. The laser sources transmit a plurality of laser beams in the same direction according to electrical signals. The laser beams have different wavelengths. The first meta-lenses receive the laser beams, and in a first substrate, refract the laser beams to a focal point to generate a mixed laser beam. The optical fiber receives the mixed laser beam for transmission. The focal point is arranged at the input end of the optical fiber.
    Type: Grant
    Filed: September 30, 2020
    Date of Patent: July 6, 2021
    Assignee: Visera Technologies Company Limited
    Inventors: Kuo-Feng Lin, Chin-Chuan Hsieh
  • Patent number: 10931378
    Abstract: The present invention provides an optical transmitter including a semiconductor laser and a control method thereof for preventing crosstalk between channels in an NG-PON2 with a 100 GHz channel spacing by reducing a wavelength drift of the semiconductor laser. The wavelength drift occurs between a few nanoseconds and a few hundreds nanoseconds from the beginning of a burst when the semiconductor laser is operated in a burst-mode.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: February 23, 2021
    Inventor: Jeongsoo Kim
  • Patent number: 10887021
    Abstract: Techniques are described for configuring an optical network unit (ONU) in a pre-burst state prior to transitioning the ONU to a burst-on state. During the pre-burst state, a laser emitter of the ONU stabilizes to its wavelength, thereby reducing the impact of wavelength drift when the ONU transitions to the burst-on state.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: January 5, 2021
    Assignee: Calix, Inc.
    Inventors: Harold A. Roberts, Nicholas A. Proite, Christopher T. Bernard, Peter O. Lee
  • Patent number: 10735103
    Abstract: A reception device 20 is configured to include a separation means 21 and a plurality of optical reception means 22. Each optical reception means 22 further includes an optical/electrical conversion means 23, a reception coefficient computation means 24, and a band restoration means 25. The separation means 21 separates a multiplexed signal into which signals of respective channels to which spectral shaping that narrows bandwidth to less than or equal to a baud rate is applied as band narrowing filter processing on the transmission side, based on characteristics of a transmission line are multiplexed at spacings less than or equal to the baud rate. Each band restoration means 25 applies processing having inverse characteristics to those of the band narrowing filter processing to a reception signal, based on the band narrowing parameter acquired by the reception coefficient computation means 24 and thereby restores the band of the reception signal.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: August 4, 2020
    Assignee: NEC CORPORATION
    Inventor: Hidemi Noguchi
  • Patent number: 10720995
    Abstract: The present disclosure provides signal management with unequal eye spacing by: sending, from a local transmitter, first and second signals with different first and second known eye patterns to a remote receiver over a channel; sending temperature data of the local transmitter and operating wavelength data of the first and second signals to the remote receiver over the channel; receiving, from the remote receiver, tuning parameters based on a dispersion of the channel based on a first difference between the first known eye pattern as transmitted and as received and a second difference between the second known eye pattern as transmitted and as received; and adjusting transmission rail values used to encode data for transmission over the channel by the local transmitter based on the tuning parameters to produce a conditioned signal for transmission with an unequally spaced eye pattern.
    Type: Grant
    Filed: August 21, 2019
    Date of Patent: July 21, 2020
    Assignee: Cisco Technology, Inc.
    Inventors: Marco Mazzini, Christopher R. S. Fludger, Alberto Cervasio, Matthew J. Traverso
  • Patent number: 10656426
    Abstract: Systems, devices, and methods of manufacturing optical engines and laser projectors that are well-suited for use in wearable heads-up displays (WHUDs) are described. Generally, the optical engines of the present disclosure integrate a plurality of laser diodes (e.g., 3 laser diodes, 4 laser diodes) within a single, hermetically or partially hermetically sealed, encapsulated package. A grating waveguide combiner comprising a plurality of waveguides having grating couplers thereon may be used to combine beams of light emitted by the plurality of laser diodes into a coaxially superimposed aggregate beam. Such optical engines may have advantages over existing designs including, for example, smaller volumes, better manufacturability, faster modulation speed, etc. WHUDs that employ such optical engines and laser projectors are also described.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: May 19, 2020
    Assignee: North Inc.
    Inventors: Jörg Pierer, Rony Jose James, Stefan Mohrdiek, Martin Joseph Kiik, Syed Moez Haque, Douglas Raymond Dykaar
  • Patent number: 10623097
    Abstract: A transmitting apparatus and a receiving apparatus for visible light communication and a visible light communication system resistant to optical interference is provided. The visible light communication system includes a transmitting apparatus and a receiving apparatus. The transmitting apparatus includes a complimentary data generator and two transmitting modules. The transmitting modules include plurality of visible light sources and a transmitting polarization lens. Polarization of the two transmitting polarization lenses are orthogonal to each other. The receiving apparatus includes two receiving modules and a differential amplification module. The receiving modules include a photodiode and a receiving polarization lens. Polarization of the receiving polarization lens pair and transmitting polarization lens pair are the same.
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: April 14, 2020
    Assignee: Qatar Foundation for Education, Science and Community Development
    Inventor: Amine Bermak
  • Patent number: 10560195
    Abstract: A bias control apparatus and method of a modulator of an optical transmitter and an optical transmitter, in which by performing mutual interference on driving signals of two Mach-Zehnder modulators constituting the modulator of the optical transmitter, output optical fields of the two Mach-Zehnder modulators are correlated. Hence, an output power signal of the modulator of the optical transmitter contains information on phase bias. Thus, the phase bias may be controlled by using the output power signal, sensitivity of the bias control may be efficiently improved, and various types of modulation formats may be applied.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: February 11, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Yangyang Fan, Zhenning Tao
  • Patent number: 10554326
    Abstract: Provided are a fiber-to-the-home implementing method and device. The method includes: receiving, by a virtual Passive Optical Network Medium Access Control (PON MAC) of an Optical Network Unit (ONU), a first packet from an Optical Line Terminal (OLT), determining that the first packet matches the virtual PON MAC, and searching a preset corresponding relationship for a first buffer area corresponding to the virtual PON MAC receiving the first packet; buffering, by the ONU, the received first packet in the searched first buffer area; and sending, by the ONU, the first packet in the first buffer area to a user via a User Network Interface (UNI) corresponding to the first buffer area.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: February 4, 2020
    Assignee: ZTE CORPORATION
    Inventors: Xiuling Gu, Hua Jian, Dahai Dai
  • Patent number: 10554309
    Abstract: A method decodes an optical signal transmitted over an optical channel from a transmitter to a receiver. The method produces, from the transmitted optical signal, a digital signal including received data symbols and received pilot symbols and determines phase noise on the pilot symbols using a statistical probability distribution of phase noise on the optical channel and errors between phases of the received pilot symbols and the transmitted pilot signals. The method estimates phase noise on the data symbols using an interpolation of the phase noise on the pilot symbols and compensates the digital signal with the phase noise on the data symbols to produce a filtered signal with an equalized phase. The method demodulates and decodes the filtered signal to produce an estimate of the transmitted optical signal.
    Type: Grant
    Filed: January 18, 2018
    Date of Patent: February 4, 2020
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: David Millar, Milutin Pajovic, Toshiaki Koike-Akino, Keisuke Kojima, Kieran Parsons
  • Patent number: 10502900
    Abstract: A photonic integrated circuit (PIC) includes a semiconductor substrate with a main bus waveguide disposed within the substrate. Two or more ring lasers are disposed within the substrate and are optically coupled to the main bus waveguide. The ring lasers have a wavelength control mechanism allowing change of a lasers emitted wavelength. A wavelength selective filter is optically coupled to the bus waveguide. A control circuit is electronically coupled to each wavelength control mechanism, and the wavelength selective filter. The control circuit in conjunction with the selective filter allows monitoring of a ring laser's wavelength on the main bus waveguide. Based on a determined wavelength, the control circuit may change a ring laser wavelength to a desired wavelength to achieve a desired wavelength spacing for each of the ring lasers. The PIC may be integrated as a coarse wave-length division multiplexing (CWDM) transmit module.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: December 10, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Mir Ashkan Seyedi, Di Liang
  • Patent number: 10447005
    Abstract: A light source device includes: a semiconductor light-emitting device including a flat-shaped base having a first main surface on a first side and a second main surface and a semiconductor light-emitting element disposed on the first side; a first fixing component having a first through-hole and a first pressing surface that presses the first main surface; and a second fixing component having a second through-hole and a second pressing surface that presses the second main surface. The base is fixed between the first and second pressing surfaces by an engagement between a first inner surface surrounding the first through-hole of the first fixing component and a second outer surface of the second fixing component. A distance between the first and second pressing surfaces is smaller than or equal to a thickness of the base, and a void is formed lateral to the base between the first and second pressing surfaces.
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: October 15, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kazuhiko Yamanaka, Kiyoshi Morimoto, Hideki Kasugai, Kazuyuki Matsumura, Hideo Yamaguchi, Nobuyasu Suzuki
  • Patent number: 10439726
    Abstract: A local node of an optical network obtains local operating parameters associated with a bi-directional link to a remote node of the optical network, including a nominal local wavelength and a local temperature. The local node also obtains remote operating parameters of the remote node, including a nominal remote wavelength and a remote temperature. The local node further determines a target local wavelength based on a comparison of the local operating parameters and the remote operating parameters, and tunes a local transmitter to generate light at the target local wavelength. The local node also tunes a local filter to transmit light at the target local wavelength and reflect light at a target remote wavelength. This may be done by exchanging a configuration identifier with the remote node. The configuration identifier from the remote node is encoded in pulses of light from a remote transmitter in the remote node.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: October 8, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Marco Mazzini, Alberto Cervasio, Tao Ling
  • Patent number: 10291325
    Abstract: An optical network unit according to one manner of the present invention includes an optical transceiver configured to be connected to an optical communication line, a plurality of media access control (MAC) processing units, a plurality of user network interface (UNI) ports each connected to one MAC processing unit of the plurality of MAC processing units, and an integration unit integrating a plurality of communication paths connected to the plurality of MAC processing units, respectively, and connected to the optical transceiver.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: May 14, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yasuhiro Takizawa, Shuitsu Yuda
  • Patent number: 10254570
    Abstract: An electro-optic device may comprise a Mach-Zehnder modulator (MZM) and one or more components. The one or more components may apply a child DC bias with dither to arms of a first branch of the MZM and to arms of a second branch of the MZM, and determine a second harmonic of a first return signal. The one or more components may apply a child DC bias with phase-shifted dither to the arms of the first branch or to the arms of the second branch, and determine a second harmonic of a second return signal. The one or more components may determine, based on the second harmonics, whether the first branch and the second branch are operating at quadrature, and may selectively adjust parent DC biases, applied to the first branch and the second branch, based on whether the first branch and the second branch are operating at quadrature.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: April 9, 2019
    Assignee: Lumentum Operations LLC
    Inventors: Dan Burke, Fredrik Sy
  • Patent number: 10215925
    Abstract: Systems and methods are provided for stabilizing the resonance properties of a microring resonator modulator. Intrinsic optical absorption within the p-n junction of a microring modulator resonator is employed as a feedback signal for thermally stabilizing the microring resonator modulator. In some example embodiments, the input optical power provided to a bus waveguide that is optically coupled to the microring resonator modulator is sufficiently low such that the photocurrent dependence on input power is predominantly linear in nature, thereby avoiding or reducing the effect of nonlinear absorption through two-photon absorption.
    Type: Grant
    Filed: August 22, 2018
    Date of Patent: February 26, 2019
    Assignee: MCMASTER UNIVERSITY
    Inventors: Andrew P. Knights, Zhao Wang
  • Patent number: 10187176
    Abstract: A method, an apparatus, and a device for modulating an orthogonal frequency division multiplexing optical signal are provided and relate to the field of optical communications technologies. The method includes: performing bit-to-symbol mapping and serial-to-parallel conversion on a baseband signal to obtain at least two sub symbol sequences of the baseband signal; determining, from all subcarriers of an OFDM signal, a subcarrier used for loading a pilot signal; updating, according to information of the pilot signal, content corresponding to the subcarrier used for loading the pilot signal; and performing inverse discrete Fourier transform, parallel-to-serial conversion, digital-to-analog conversion, and electrical amplification processing on content currently corresponding to all the subcarriers of the OFDM signal, and modulating a light wave by using processed data and a bias electrical signal, to form an OFDM optical signal loaded with the pilot signal.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: January 22, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Ning Deng
  • Patent number: 10171172
    Abstract: An optical transmitter that outputs an optical signal with a pulse amplitude modulation (PAM) configuration is disclosed. The optical transmitter includes a light-generating device and a driver. The light-generating device has non-linearity in a transfer characteristic between the electrical driving signal and the optical signal. The driver includes a PAM signal generator, a level controller, and an output driver. The PAM signal generator receives the input electrical signal and outputs a PAM signal. The level controller adjusts the electrical levels of the PAM signal based on the non-linear transfer characteristic of the light-generating device, where the electrical levels set the optical levels of the optical signal with preset ratios. The output driver generates the driving signal by superposing the electrical levels adjusted by the level controller with the PAM signal provided from the PAM signal generator.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: January 1, 2019
    Assignee: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventor: Ryouta Teranishi
  • Patent number: 10171165
    Abstract: A visible light signal generating method is a method for generating a visible light signal transmitted in response to a change in a luminance of a light source of a transmitter, and includes: generating a header (SHR), where the header is data in which first and second luminance values, which are different luminance values, alternately appear along a time axis; generating a PHY payload A and a PHY payload B by determining a time length according to a first mode, where the time length is a time length during which each of the first and second luminance values continues in the data in which the first and second luminance values alternately appear along the time axis, and the first mode matches a transmission target signal; and generating the visible light signal by joining the header (SHR), the PHY payload A and the PHY payload B.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: January 1, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventors: Hideki Aoyama, Mitsuaki Oshima
  • Patent number: 10171175
    Abstract: An apparatus for despreading in an optical domain configured to split a received optical signal into a first optical signal and a second optical signal, perform phase deflection on the second optical signal, output a third optical signal, perform phase deflection on the first optical signal and the third optical signal, output a fourth optical signal and a fifth optical signal to a balanced receiver, and superimpose the fourth optical signal and the fifth optical signal to generate a first electrical signal. A multiplication operation in conventional code division multiple access (CDMA) despreading is transferred from an electrical domain to an optical domain such that a chip rate can be easily raised to 20 gigahertz (GHz) or even to 25 GHz, a maximum rate of 100 gigabits per second (Gbps) can be provided in a single wavelength, and a user requirement for high bandwidth can be met.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: January 1, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Liming Fang, Lei Zhou, Meng Sui, Xiaofeng Zhang
  • Patent number: 10148065
    Abstract: A drive circuit of a light emitting element, the drive circuit includes: an input terminal configured to receive an input signal; an output terminal configured to output a signal based on the input signal as a drive signal to the light emitting element; and a main body circuit configured to generate the drive signal by carrying out timing correction to reduce a difference from a standard delay value for rising or falling of a plurality of signal patterns of the input signal regarding a timing of rising of a first signal subsequent to a first signal pattern in the plurality of signal patterns or a timing of falling of a second signal subsequent to a second signal pattern in the plurality of signal patterns.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: December 4, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Yukito Tsunoda
  • Patent number: 10148464
    Abstract: A driver circuit for an optical transmitter includes a main path in parallel with an inverting path. The data signals from the main path and the inverting path can be combined to generate an output signal for a laser diode. The main path can communicate a data signal via a first transmission line and the inverting path can communicate an inverted data signal via a second transmission line. The second transmission line can be longer than the first transmission line in order to delay the inverted data signal. In addition, the inverted data signal can be weighted before being combined with the data signal from the main path.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: December 4, 2018
    Assignee: ADTRAN, Inc.
    Inventor: Daniel M. Joffe
  • Patent number: 10129054
    Abstract: Systems and methods for creating and using a first and second group of training sequences in a training-aided single-carrier frequency domain equalization system. The first group of training sequences are conventional training sequences and the second group of training sequences are 90°-rotated versions of the first group of training sequences.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: November 13, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Qing Guo, Wei-Ren Peng, Yan Cui, Yu Sheng Bai
  • Patent number: 10110305
    Abstract: Extremely High Frequency (EHF) distributed antenna systems and related components and methods are disclosed. In one embodiment, a base unit for distributing EHF modulated data signals to a RAU(s) is provided. The base unit includes a downlink data source input configured to receive downlink electrical data signal(s) from a data source. The base unit also includes an E-O converter configured to convert downlink electrical data signal(s) into downlink optical data signal(s). The base unit also includes an oscillator configured to generate an electrical carrier signal at a center frequency in the EHF band. The base unit also includes a modulator configured to combine the downlink optical data signal(s) with the electrical carrier signal to form downlink modulated optical signal(s) comprising a downlink optical data signal(s) modulated at the center frequency of the electrical carrier signal. The modulator is further configured to send the downlink modulated optical signal to the RAU(s).
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: October 23, 2018
    Assignee: Corning Optical Communications LLC
    Inventors: Jacob George, Anthony Ng'Oma, Alranzo Boh Ruffin, Michael Sauer
  • Patent number: 10075311
    Abstract: A clock correction method is provided. The clock correction method includes the following steps: receiving a training signal in a communication protocol, wherein the training signal carries a specific signal pattern occurring repeatedly; performing frequency division on the training signal according to a number of toggles of the specific signal pattern so as to generate an equalization training sequence clock; and correcting a frequency of an output clock of an oscillator according to the equalization training sequence clock.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: September 11, 2018
    Assignee: Silicon Motion Inc.
    Inventor: Yain-Reu Lin
  • Patent number: 10050720
    Abstract: Devices and methods for converting an input electromagnetic signal to an output optical signal consisting of dual sidebands with equalized quantum-limited noise figures of about 3 dB are provided. For instance, a device includes an input for receiving the input electromagnetic signal and an output for delivering the output optical signal; and a non-linear material component connected between the input and the output of the device, the non-linear material component having a non-linear electric susceptibility, wherein the non-linear electric susceptibility of the non-linear material component is selected to mix the input signal with an optical pump signal to produce the output optical signal, wherein the output optical signal has sidebands corresponding to the input signal, and amplifying this optical signal in a phase-sensitive amplifier to produce an output optical signal with sidebands having equalized amplitudes and noise figures.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: August 14, 2018
    Assignee: Vencore Labs, Inc.
    Inventors: James Dailey, Anjali Agarwal, Paul Toliver, Colin McKinstrie, Nicholas Peters
  • Patent number: 10027409
    Abstract: The invention provides a communication system (500), a lighting system, a method of transmitting information and a computer program product. The communication system according to the invention is configured for transmitting data via visible light. The communication system comprises a signal generator (530) for generating a light driving signal (200) being a frequency shift key modulated signal comprising a sequence of signal parts (215, 225), each signal part being modulated at a first or second frequency in accordance with the data, the signal parts modulated at the first frequency having first pulses in first periods (T0) and the signal parts modulated at the second frequency having second pulses in second periods (T1). Energy of the visible light corresponding to a pulse in a respective period has center of gravity in time.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: July 17, 2018
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Ronald Rietman, Stephanus Joseph Johannes Nijssen
  • Patent number: 10027424
    Abstract: In an optical communication system having flexible transceivers, a transmitter section of one of the flexible transceivers generates a modulated pilot signal whose amplitude or phase or both have been modulated according to a digital code. An optical signal is transmitted from the transmitter section to a receiver section of another of the flexible transceivers. The optical signal conveys data and the modulated pilot signal. The digital code encodes parameter information for the transmitter section and for the receiver section. The receiver section receives the modulated pilot signal, determines the digital code by demodulating the modulated pilot signal, and determines the parameter information from the digital code. The transmitter section and the receiver section adjust their configuration according to the parameter information. The receiver section, while configured according to the parameter information, processes received data or future received data.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: July 17, 2018
    Assignee: Ciena Corporation
    Inventors: Qunbi Zhuge, David V. Plant
  • Patent number: 9998232
    Abstract: An optical device may include a transmitter to provide an optical signal via a set of channels and a modulator. The optical device may include two or more tributary modulators to modulate the set of channels with a training pattern. The optical device may include a set of optics to alter a first channel relative to a second channel of the set of channels. The optical device may include a detector to determine an optical power measurement of the optical signal after the first channel is altered relative to the second channel. The optical device may include a controller to generate a control signal to adjust a power balance associated with the optical signal based on the optical power measurement. The optical device may include a controller to provide the control signal to a tributary modulator to alter a modulation of the optical signal.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: June 12, 2018
    Assignee: Juniper Networks, Inc.
    Inventors: Yang Yue, Qiang Wang, Bo Zhang
  • Patent number: 9999038
    Abstract: A distributed antenna system is provided that frequency shifts the output of one or more microcells to a 60 GHz or higher frequency range for transmission to a set of distributed antennas. The cellular band outputs of these microcell base station devices are used to modulate a 60 GHz (or higher) carrier wave, yielding a group of subcarriers on the 60 GHz carrier wave. This group will then be transmitted in the air via analog microwave RF unit, after which it can be repeated or radiated to the surrounding area. The repeaters amplify the signal and resend it on the air again toward the next repeater. In places where a microcell is required, the 60 GHz signal is shifted in frequency back to its original frequency (e.g., the 1.9 GHz cellular band) and radiated locally to nearby mobile devices.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: June 12, 2018
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Farhad Barzegar, Paul Shala Henry, George Blandino, Irwin Gerszberg, Donald J. Barnickel, Thomas M. Willis, III
  • Patent number: 9979490
    Abstract: An optical data transmission method comprising partitioning an optical signal into a plurality of frequency sub-bands, generating a signal frequency mapping that rearranges the plurality of frequency sub-bands, choosing a plurality of frequency components based on the signal frequency mapping to form a set of frequency components, and transmitting the set of frequency components using frequency diversity transmission. An optical data receiving method comprising obtaining a signal frequency mapping for an original signal, receiving an optical signal that comprises a plurality of frequency sub-bands, re-arranging the plurality of frequency sub-bands using the signal frequency mapping to generate a restored original signal, and processing the restored original signal to recover an original data sequence.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: May 22, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Xiang Liu, Frank Effenberger
  • Patent number: 9935717
    Abstract: In an optical synthesizer, a laser source outputs a laser. An optical modulator modulates the frequency of the laser to output a light including a first frequency component. An optical filter extracts the first frequency component from the output of the optical modulator. An optical comb generator generates an optical comb based on the laser and a predetermined driving signal. A variable-wavelength narrowband filter extracts a second frequency component from the optical comb. An optical-electric converter outputs an electric signal based on the frequency difference between the first and second frequency components.
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: April 3, 2018
    Assignee: National Institutes of Natural Sciences
    Inventor: Hitoshi Kiuchi
  • Patent number: 9882702
    Abstract: An active transceiver circuit for transmission of a low bitrate data signal over and reception of a high bitrate data signal from a single ended transmission medium is provided. The active transceiver circuit includes an input port for receiving a low bitrate input data signal, an output port for delivering a high bitrate output data signal, a differential input/output port for launching a low bitrate data signal into the single ended transmission medium and for receiving a high bitrate data signal from the single ended transmission medium, a first and second single ended output driver adapted for each delivering, on their respective output nodes, the shaped low bitrate input data signal, and a high bitrate receiver for receiving the signals at output nodes of the first and second single ended output drivers, and for generating a high bitrate output data signal on the output port.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: January 30, 2018
    Assignee: EQCOLOGIC N.V.
    Inventors: Bram Devuyst, Maarten Kuijk
  • Patent number: 9871585
    Abstract: The invention relates to the field of IEEE 802.15.4 based networks, and in particular to methods and devices for transmitting and receiving messages in IEEE 802.15.4 based networks. The existing IEEE 802.15.4 standard is further improved and adapted to better fit the properties of a network of lighting devices. The improvements and adaptations of the existing IEEE 802.15.4 standard allow for more flexible addressing. Bits which are indicative of use of address fields and/or whether one or two frame control fields is/are present in the ordered data portions of the message to be transmitted are defined by the device transmitting the message in the IEEE 802.15.4 based network. Existing features of the existing IEEE 802.15.4 standard protocol are retained.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: January 16, 2018
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Ronald Rietman, Robert James Davies
  • Patent number: 9853737
    Abstract: Disclosed are bias control methods for Mach-Zehnder modulators for the generation of optical QAM signals while ensuring correct I/Q polarity of the generated optical QAM signal. One exemplary method involves temporarily offsetting I and Q biases from ideal transmission null bias points while another illustrative method temporarily makes I and Q data streams identical.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: December 26, 2017
    Assignee: Acacia Communications, Inc.
    Inventors: Christian Rasmussen, Seo Yeon Park, Mehrdad Givehchi
  • Patent number: 9835880
    Abstract: A circuit that may include a circuit network and a transmission line coupled to the circuit network. The circuit network may include an electro-optic modulator and various inductors. The electro-optic modulator may be a capacitive load having a predetermined capacitance. The circuit may further include a resistor coupled to the circuit network. The resistor may have a resistance value configured to produce a first impedance with the circuit network. The first impedance may be configured to match substantially with a second impedance in the transmission line. The circuit may further include an electric driver couple to the transmission line. The electric driver may be configured for transmitting a driving voltage to the electro-optic modulator. The driving voltage may be configured to generate a predetermined voltage swing across the electro-optic modulator.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: December 5, 2017
    Assignee: Ciena Corporation
    Inventors: Vladimir Pelekhaty, Michael Y. Frankel
  • Patent number: 9819525
    Abstract: To provide signal generating apparatus that is capable of controlling the DC bias of the optical modulator applicable to various kinds of modulation format, a signal processing apparatus includes a digital processing unit for deserializing an input digital data into parallel data lanes, for comparing the value of the digital data of symbol rate F to at least one predetermined threshold value, for selecting an offset value based on the result of the comparison; and for adding the selected offset value to the digital data, a converting unit for converting the digital data added the offset value to analog signals in each lane; an optical modulating unit for modulating a lightwave according to the analog signals with predetermined modulation format at the symbol rate F, where the modulated signal contains a frequency component at F/N.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: November 14, 2017
    Assignee: NEC CORPORATION
    Inventors: Emmanuel Le Taillandier De Gabory, Daisaku Ogasahara, Shinsuke Fujisawa
  • Patent number: 9780977
    Abstract: A clock correction method is provided. The clock correction method includes the following steps: receiving an equalization training sequence specified by a communication protocol, wherein the equalization training sequence includes a specific pattern occurring repeatedly; performing frequency division on the equalization training sequence according to a number of toggles of the specific pattern so as to generate an equalization training sequence clock; and correcting a frequency of an output clock of an oscillator according to the equalization training sequence clock.
    Type: Grant
    Filed: October 10, 2016
    Date of Patent: October 3, 2017
    Assignee: Silicon Motion Inc.
    Inventor: Yain-Reu Lin
  • Patent number: 9762027
    Abstract: A VCSEL can include: an electro-optic modulator between a lasing active region and a light emitting surface. The electro-optic modulator can include: an electro-optically active region; a modulator mirror region over the electro-optically active region; and at least one electrical insulator region separating the modulator mirror region into at least two separate modulator mirror cavities electrically isolated from each other, wherein each separate modulator mirror cavity and a longitudinally aligned portion of the electro-optically active region form an electro-optic modulator cavity. A method of emitting light from a VCSEL can include: emitting a laser beam from the lasing active region along a longitudinal axis; and changing a refractive index of one electro-optic modulator cavity so as to steer the laser beam from the longitudinal axis.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: September 12, 2017
    Assignee: FINISAR CORPORATION
    Inventor: Ralph Herbert Johnson
  • Patent number: 9712363
    Abstract: A transmitting circuit, a transceiver, a communication system, and a method for transmitting data. The transmitting circuit includes a digital interface circuit configured to obtain, in a predetermined bandwidth, data to be sent, and decompose the data into N parallel sub digital signal flows; a digital modulation circuit configured to modulate the N sub digital signal flows to obtain N modulated signals; a frequency relocation circuit configured to perform frequency relocation on the N modulated signals; a synthesizer configured to modulate M modulated signals of the N modulated signals that have undergone frequency relocation into a bandwidth signal; a digital to analog converter configured to receive the bandwidth signal, and perform digital to analog conversion on the bandwidth signal to obtain an analog signal; an up-conversion circuit configured to receive the analog signal, and convert the analog signal into a radio frequency signal.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: July 18, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Wen Tong, Guangjian Wang, Huang Huang, Xi Yan, Kunpeng Liu
  • Patent number: 9698911
    Abstract: A system, method, and device for RF upconversion. The system can include a laser, two EAMs, a photonic filter, a photonic service filter, two photodiodes, and a mixer. The first EAM can convert a received RF signal into the photonic domain by modulating an optical signal (received from the laser) based on the received RF signal to output a modulated optical signal. The photonic filter can output a filtered optical signal based on the modulated optical signal to the first photodiode which can output a filtered RF signal in the RF domain. The second EAM can output an LO modulated optical signal based on a received LO to the service filter which can output a filtered LO optical signal to the second photodiode which can output a filtered LO signal in the RF domain. The mixer can mix the filtered RF and LO signals to generate an IF signal.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: July 4, 2017
    Assignee: Lockheed Martin Corporation
    Inventors: Andrew F. Schaefer, Paul T. Coyne, John C. Ceccherelli
  • Patent number: 9673906
    Abstract: A photonic device for amplitude modulation of an optical signal, in which a source of the optical signal is coupled to an input waveguide separating through an optical splitter into two arms which recombine through an optical combiner in an output waveguide, wherein the arms are phase shifted by ?/2 and each include an electro-optical amplitude modulator. The device may be adapted to modulate a wavelength multiplexed signal.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: June 6, 2017
    Assignee: Commissariat à l'énergie atomique et aux énergies alternatives
    Inventors: Sylvie Menezo, Olivier Dubray
  • Patent number: 9647767
    Abstract: A signal processing method including obtaining, using an optical receiver, a data signal that comprises one or more pairs of pilot tones and a plurality of subcarrier signals, identifying the one or more pairs of pilot tones, determining a local oscillator frequency offset estimation for the data signal using the one or more pairs of pilot tones, wherein the local oscillator frequency offset estimation indicates a frequency offset, and compensating the data signal in accordance with the local oscillator frequency offset estimation. A signal processing method including obtaining, using an optical receiver, a data signal that comprises one or more pairs of pilot tones and a plurality of subcarrier signals, identifying the one or more pairs of pilot tones, determining a chromatic dispersion estimation for the data signal using the one or more pairs of pilot tones, and compensating the data signal in accordance with the chromatic dispersion estimation.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: May 9, 2017
    Assignee: Futurewei Technologies, Inc.
    Inventors: Qing Guo, Fei Zhu, Yu Sheng Bai
  • Patent number: 9625323
    Abstract: The invention relates to a method for determining the relative temporal position of electromagnetic pulses. Said method having the steps generating a sequence of first electromagnetic pulses, generating a sequence of second electromagnetic pulses, overlaying at least a part of the first and the second pulses in a saturable absorber, detecting the second pulses that have passed through the saturable absorber by means of a detector in such a manner that the second pulses, but not the first pulses that have passed through the saturable absorber, are detected, and determining the temporal position of the first pulses relative to the temporal position of the second pulses with the aid of a signal from the detector which is generated when the second pulses that have passed through the saturable absorber are received.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: April 18, 2017
    Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FÖDERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Bernd Sartorius, Roman Dietz, Helmut Roehle
  • Patent number: 9606377
    Abstract: An integrated broadband optical isolator that operates over a wide bandwidth, wherein the optical isolator comprises sinusoidally driven phase modulators inside an interferometer. In one exemplary embodiment the optical isolator comprises: a 1×N input optical coupler, where N>2; a N×1 output optical coupler; N optical waveguides optically connecting the 1×N input optical coupler to the N×1 output optical coupler, each one of the N optical waveguides including two phase modulators, wherein each of the phase modulators are driven at a frequency f and wherein the time it takes an optical signal to travel from the center of one phase modulator in a particular waveguide to the center of the other phase modulator in that particular waveguide is substantially equal to 1/4f.
    Type: Grant
    Filed: January 2, 2013
    Date of Patent: March 28, 2017
    Assignee: Acacia Communications, Inc.
    Inventor: Christopher Doerr
  • Patent number: 9602209
    Abstract: Extremely High Frequency (EHF) distributed antenna systems and related components and methods are disclosed. In one embodiment, a base unit for distributing EHF modulated data signals to a RAU(s) is provided. The base unit includes a downlink data source input configured to receive downlink electrical data signal(s) from a data source. The base unit also includes an E-O converter configured to convert downlink electrical data signal(s) into downlink optical data signal(s). The base unit also includes an oscillator configured to generate an electrical carrier signal at a center frequency in the EHF band. The base unit also includes a modulator configured to combine the downlink optical data signal(s) with the electrical carrier signal to form downlink modulated optical signal(s) comprising a downlink optical data signal(s) modulated at the center frequency of the electrical carrier signal. The modulator is further configured to send the downlink modulated optical signal to the RAU(s).
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: March 21, 2017
    Assignee: Corning Optical Communications LLC
    Inventors: Jacob George, Anthony Ng'Oma, Alranzo Boh Ruffin, Michael Sauer
  • Patent number: RE47760
    Abstract: Methods and apparatus for distributing content using a spectrum generation device. In one embodiment, digital content is received via a time-multiplexed network transport (such as Gigabit Ethernet), and converted to frequency channels suitable for transmission over a content distribution (e.g., Hybrid Fiber Coaxial (HFC)) network. In one variant, the conversion is performed using digital domain processing performed by a full spectrum generation device. Additionally, methods and apparatus for selectively adding, removing, and/or changing digital content from the full spectrum device are also disclosed. Various aspects of the present invention enable physical (infrastructure) consolidation, and software-implemented remote management of content distribution.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: December 3, 2019
    Assignee: Time Warner Cable Enterprises LLC
    Inventor: Glen Hardin