Transmitter Patents (Class 398/182)
  • Patent number: 11828594
    Abstract: A laser sensor module includes a first laser source configured to emit first modulated light, the first modulated light being modulated laser light. The laser sensor module further includes circuitry configured to drive the first laser source with a first modulated driving current to cause the first laser source to emit the modulated laser light, a detector configured to detect the modulated laser light, which induces a photocurrent with variations resulting from modulation of the modulated laser light, and a second laser source configured to emit second modulated light. The circuitry is further configured to drive the second laser source with a second modulated driving current to cause the second laser source to emit the second modulated light. The detector is configured to detect the second modulated light. The circuitry is configured to adapt the amplitude of the second modulated driving current to induce a contribution to the photocurrent.
    Type: Grant
    Filed: September 13, 2021
    Date of Patent: November 28, 2023
    Inventors: Hans Spruit, Jochen Hellmig, Alexander Marc Van der Lee, Jeroen Dragt, Pieter Hoeven
  • Patent number: 11811457
    Abstract: A method for generating millimeter wave noise with a flat RF (radio frequency) spectrum includes the following steps. A noise optical signal with an optical spectrum in Gaussian shape is output by a first optical emission module. The noise optical signal is transmitted to an optical coupler. n beams of noise optical signals with optical spectra in Gaussian shape is output by a second optical emission module. The noise optical signals is transmitted to the optical coupler. The noise light generated by the first optical emission module and the second optical emission module is coupled to the optical coupler. The coupled optical signals is transmitted to a photodetector. The beat frequency is performed by the photodetector to realize mapping transformation from the optical spectra to the RF spectra. The flat millimeter wave noise is output.
    Type: Grant
    Filed: July 21, 2021
    Date of Patent: November 7, 2023
    Inventors: Yuncai Wang, Yimin Huang, Yuehui Sun, Wenjie Liu, Zhensen Gao, Yu Cheng
  • Patent number: 11791905
    Abstract: A system for estimating an imbalance between electrical-optical responses of an in-phase (I) channel and a quadrature (Q) channel in an optical amplitude and phase modulator (optical IQ modulator) includes an optical detector (PD), an analog-digital converter (ADC), and an imbalance operation unit that estimates an imbalance between electrical-optical responses of an I channel and a Q channel in the optical IQ modulator, wherein the imbalance operation unit includes an input signal information receiving unit that receives information regarding a first modulation signal, and an intensity information receiving unit that receives intensity information of the digitalized output signal from the ADC, and the imbalance operation unit estimates an imbalance between electrical-optical responses of an I channel and a Q channel in the optical IQ modulator using information regarding a first modulation signal and intensity information of the digitalized output signal.
    Type: Grant
    Filed: March 5, 2021
    Date of Patent: October 17, 2023
    Inventors: Yuki Yoshida, Naokatsu Yamamoto
  • Patent number: 11637634
    Abstract: Provided are a laser emission system and a method for compensating for wavelength drift. The laser emission system includes a burst signal controller, a laser emitting chip, a TEC controller, and a TEC, the TEC is attached to the laser emitting chip, the burst signal controller is connected with the laser emitting chip and the TEC controller, respectively, the TEC controller is connected with the TEC, and the burst signal controller simultaneously sends a burst control signal to the laser emitting chip and the TEC controller; the laser emitting chip activates or deactivates a laser based on the received burst control signal; the TEC controller correspondingly controls a target temperature of the TEC based on the received burst control signal, so that the target temperature of the TEC is low when the laser is activated, and the target temperature of the TEC is high when the laser is deactivated.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: April 25, 2023
    Inventor: Haiyuan Li
  • Patent number: 11575244
    Abstract: A semiconductor laser device includes a semiconductor laser element, a base material supporting the semiconductor laser element, and a wiring portion formed on the base material and constituting a conduction path to the semiconductor laser element. The base material includes a mounting face oriented to one side in a thickness direction of the base material and having the semiconductor laser element mounted thereon, while also including an emission part located on one side with respect to the semiconductor laser element in a first direction perpendicular to the thickness direction. Light from the semiconductor laser element is emitted through the emission part to the outside.
    Type: Grant
    Filed: December 27, 2018
    Date of Patent: February 7, 2023
    Assignee: ROHM CO., LTD.
    Inventor: Hiroyuki Tajiri
  • Patent number: 11569422
    Abstract: A semiconductor package is provided in the present disclosure. The semiconductor package comprises: a substrate, an electronic device disposed on the substrate, a lid disposed on the substrate and surrounding the electronic device an encapsulant formed over the substrate, encapsulating the electronic device and the lid; and a plurality of fillers in the encapsulant, configured to diffuse light interacting with the electronic device. In this way, through the use of the encapsulant including the fillers distributed therein, additional optical filters and diffusers are not needed. Also, through the use of the lid, undesired stray light can be prevented from being interacting with the electronic device.
    Type: Grant
    Filed: September 9, 2020
    Date of Patent: January 31, 2023
    Inventors: Wei-Tang Chu, Tsu-Hsiu Wu, Chun Yu Ko
  • Patent number: 11442152
    Abstract: A lidar system that includes a laser source and transmits laser pulses produced by the laser source toward range points in a field of view can use a laser energy model to model the available energy in the laser source over time. The timing schedule for laser pulses fired by the lidar system can then be determined using energies that are predicted for the different scheduled laser pulse shots based on the laser energy model. This permits the lidar system to reliably ensure at a highly granular level that each laser pulse shot has sufficient energy to meet operational needs, including when operating during periods of high density/high resolution laser pulse firing. The laser energy model is capable of modeling the energy available for laser pulses in the laser source over very short time intervals (such as 10-100 nanoseconds).
    Type: Grant
    Filed: September 23, 2021
    Date of Patent: September 13, 2022
    Assignee: AEYE, Inc.
    Inventors: Philippe Feru, Luis Dussan, Joel Benscoter, Alex Liang, Igor Polishchuk, Allan Steinhardt
  • Patent number: 11429007
    Abstract: A Mach Zehnder modulator operates by phase modulating split optical beams with a modulating signal to create dissimilarities in the optical characteristics between the split beams. When the beams are recombined, the dissimilarities gives rise to intensity modulations that are indicative of the modulating signal. One or both beams are modulated with an RF trimming signal. The trimming signal is applied asymmetrically across the two beams thereby reducing the intensity of the optical carrier frequency in one of the beams more than in the other. By selecting the size of the trimming signal the differences in the optical amplitude of the carrier frequency in the two beams can be nulled.
    Type: Grant
    Filed: December 24, 2019
    Date of Patent: August 30, 2022
    Assignee: LEONARDO UK LTD
    Inventors: Ian Flint, Taimur Mirza, Shyqyri Hahxa
  • Patent number: 11431144
    Abstract: An optical resonator device, which can be implemented in a Brillouin laser, comprises a first waveguide ring resonator having a first diameter, and one or more second waveguide ring resonators adjacent to the first waveguide ring resonator. The one or more second waveguide ring resonators each have a second diameter that is less than the first diameter. The one or more second waveguide ring resonators optically communicate with the first waveguide ring resonator, such that an optical signal in the first waveguide ring resonator optically couples into the one or more second waveguide ring resonators. The one or more second waveguide ring resonators is configured such that when the optical signal resonates within the first waveguide ring resonator and the one or more second waveguide ring resonators, the optical signal within the first waveguide ring resonator is suppressed.
    Type: Grant
    Filed: January 6, 2021
    Date of Patent: August 30, 2022
    Assignee: Honeywell International Inc.
    Inventors: Jianfeng Wu, Karl D. Nelson, Matthew Wade Puckett
  • Patent number: 11411654
    Abstract: Communications systems and methods of controlling the same include generating and processing a constant envelope phase-modulated optical signal, the systems including an optical source configured to provide a carrier waveform, an encoding module configured to encode the data as a plurality of symbol sequences, a mapping module configured to convert the plurality of symbol sequences to a plurality of phase state changes and a plurality of directions according to a path-dependent phase modulation scheme, and a phase modulator configured to modulate the carrier waveform with the plurality of phase state changes and directions to generate the constant envelope phase-modulated optical signal.
    Type: Grant
    Filed: March 24, 2021
    Date of Patent: August 9, 2022
    Inventors: Gary M. Graceffo, Andrew Kowalevicz, Benjamin P. Dolgin
  • Patent number: 11388494
    Abstract: According to example embodiments, the OLT includes at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the OLT to perform grouping data units for the ONUs in groups, wherein a group includes data units for a subset of the ONUs, encoding the groups of data units into respective sets of at least one codeword, interleaving the at least one codeword of the respective sets thereby obtaining a stream of codewords, and sequentially transmitting the stream of codewords to the ONUs.
    Type: Grant
    Filed: December 29, 2020
    Date of Patent: July 12, 2022
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Yannick Lefevre, Paul Henri Marie Cautereels, Jochen Maes
  • Patent number: 11367400
    Abstract: A display device includes a display panel including a first image unit and a second image unit, a data driver which applies data voltages to the display panel, a first scan driver which applies write scan signals to the display panel, a second scan driver which applies compensation scan signals and initialization scan signals to the display panel, and a masking part connected to the second scan driver and which selectively applies the initialization scan signals to the second image unit.
    Type: Grant
    Filed: March 30, 2021
    Date of Patent: June 21, 2022
    Inventors: Taehoon Kim, Soon-Dong Kim, Changnoh Yoon, Sangan Kwon, Eun Sil Yun
  • Patent number: 11245469
    Abstract: A vehicle line-of-sight optical communication system and method for use in ad hoc networks formed with a vehicle during traveling of the vehicle along a roadway. The communication system includes: an electronic control unit (ECU) having an electronic processor that operates under control of a program to process messages sent or received by the communication system; at least one light source that comprises a part of a vehicle external lamp module; a driver circuit electrically connected to the ECU to energize the light source(s) in response to a transmission signal from the ECU so as to send messages via the light source(s); at least one light sensor that comprises a part of the vehicle external lighting system; and a receiver circuit electrically connected to the ECU to provide the ECU with a reception signal indicative of messages received via the light sensor(s).
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: February 8, 2022
    Inventors: Sridhar Lakshmanan, Paul Richardson, Ya Sha Yi
  • Patent number: 11233571
    Abstract: A method for processing low-rate service data, an apparatus, and a system, where the method includes: mapping low-rate service data into a newly defined low-rate data frame, where a rate of the low-rate data frame matches a rate of the low-rate service data, the data frame includes an overhead area and a payload area, the payload area is used to carry the low-rate service data, a rate of the payload area in the low-rate data frame is not less than the rate of the low-rate service data, and the rate of the low-rate service data is less than 1 Gbps; mapping the low-rate data frame into one or more slots in another data frame, where a rate of the slot is not greater than 100 Mbps; mapping the other data frame into an optical transport unit (OTU) frame; and sending the OTU frame.
    Type: Grant
    Filed: November 10, 2020
    Date of Patent: January 25, 2022
    Inventor: Wei Su
  • Patent number: 11190307
    Abstract: There is provided a method for receiving, by a user equipment, data using a 2-dimensional (2-D) channel-based transmission scheme, the method comprising: receiving information about allocation of a resource from a base station, wherein the 2D channel-based transmission scheme is applied to the resource; and receiving data on the resource according to the 2D channel-based transmission scheme and based on the resource allocation information.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: November 30, 2021
    Inventors: Sangrim Lee, Hojae Lee, Kwangseok Noh, Dongkyu Kim
  • 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
    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
    Inventors: Yangyang Fan, Zhenning Tao
  • 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: 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
    Inventors: Xiuling Gu, Hua Jian, Dahai Dai
  • 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
    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
    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
    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: 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: 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
    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
    Inventors: Hideki Aoyama, Mitsuaki Oshima
  • 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: 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
    Inventor: Yukito Tsunoda
  • 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: 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: 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
    Inventors: Ronald Rietman, Stephanus Joseph Johannes Nijssen
  • 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: 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