公开(公告)号：US12057883B2

公开(公告)日：2024-08-06

申请号：US17942278

申请日：2022-09-12

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yibo Lv ,  Xu Li ,  Tianxiang Wang ,  Weiwei Zhang ,  Rongdao Yu

IPC: H04B10/50 ,  H04B10/2543 ,  H04B10/2575 ,  H04J14/02 ,  H04B10/07 ,  H04B10/2507

CPC classification number: H04B10/25752 ,  H04B10/2543 ,  H04J14/0227 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/2575 ,  H04B10/50 ,  H04B10/5057

Abstract: A radio over fiber (RoF) system and a nonlinear compensation method, where the RoF system includes a BBU and an RRU, the RRU includes an electrical component, and the BBU includes a downlink and a feedback link. A predistortion module and an optical component are disposed on the downlink, an input end of the feedback link is connected to an output end of the optical component, and the feedback link is configured to feed back, to the predistortion module, a nonlinear signal output by the optical component. The RoF system further includes a temperature detection module configured to detect a temperature value of the electrical component, and transmit the temperature value to the predistortion module. The predistortion module is configured to perform digital predistortion DPD on a baseband signal based on the temperature value and the nonlinear signal.

公开(公告)号：US20190181955A1

公开(公告)日：2019-06-13

申请号：US16181996

申请日：2018-11-06

Applicant: Commissariat a l'energie atomique et aux energies alternatives

Inventor： Sylvie MENEZO

IPC: H04B10/50 ,  H04B10/69 ,  H04B10/67

CPC classification number: H04B10/5057 ,  H01S5/021 ,  H01S5/02248 ,  H01S5/0617 ,  H01S5/06817 ,  H01S5/0683 ,  H01S5/06832 ,  H01S5/0687 ,  H04B10/675 ,  H04B10/691

Abstract: An emitter of an optical signal includes a laser source including a control input for receiving an injection current able to modify the frequency of the optical signal, this laser source emitting the optical signal at a frequency v0 in the absence of injection current, a feedback loop able to produce an injection current that is able to decrease the linewidth of the optical signal, this feedback loop including to this end an optical filter a pass band of which contains a preset operating point corresponding to a frequency vb, and a loop for automatically controlling the frequency vb to the frequency v0, and wherein the feedback loop includes an electrical filter that is able to selectively attenuate, in the produced injection current, the amplitude of frequency components generated by the automatic-control loop.

公开(公告)号：US20180294886A1

公开(公告)日：2018-10-11

申请号：US15934221

申请日：2018-03-23

Applicant: Hilight Semiconductor Limited

Inventor： Dominique COUE ,  William REDMAN-WHITE

IPC: H04B10/50 ,  H04B10/564 ,  H04B10/54

CPC classification number: H04B10/504 ,  H01S5/0427 ,  H01S5/0617 ,  H01S5/06832 ,  H04B10/5057 ,  H04B10/54 ,  H04B10/564

Abstract: A system for controlling an optical data transmitter includes control circuitry comprising a voltage controlled current source configured to generate a reference current configured to generate at least two output currents whose magnitudes are in a fixed ratio wherein at least one of said output currents is used by said control circuitry to control current driver circuitry, a first plurality of serially coupled resistors, a first plurality of switches, a second plurality of serially coupled resistors, a second plurality of switches, and a look-up-table configured to control the first plurality of switches and the second plurality of switches based on an input to control a ratio.

公开(公告)号：US10056733B1

公开(公告)日：2018-08-21

申请号：US15453618

申请日：2017-03-08

Applicant: INPHI CORPORATION

Inventor： Brian Taylor ,  Radhakrishnan L. Nagarajan ,  Masaki Kato

IPC: H04J14/02 ,  H01S5/0687 ,  G02B6/28 ,  G02B6/42 ,  H01S5/12 ,  G02B6/125 ,  H04B10/50 ,  G02B6/12

CPC classification number: H01S5/0687 ,  G02B6/125 ,  G02B6/2813 ,  G02B6/2861 ,  G02B6/4286 ,  G02B2006/12135 ,  G02B2006/1215 ,  H01S5/005 ,  H01S5/021 ,  H01S5/12 ,  H04B10/5057 ,  H04J14/02

Abstract: A wavelength locker integrated with a silicon photonics transmission system comprising a silicon-on-insulator (SOI) substrate and an input via a power tap coupler to receive a fraction of a transmission signal with one or more frequencies from a primary output path of the silicon photonics transmission system. The wavelength locker further includes a splitter configured to split the input to a first signal in a first path and a second signal in a second path and a first delay-line-interferometer (DLI) coupled to the second path to receive the second signal and configured to generate an interference spectrum and output at least two sub-spectrums tunable to keep quadrature points of the sub-spectrums at respective one or more target frequencies. The wavelength locker is configured to generate an error signal fed back to the silicon photonics transmission system for locking the one or more frequencies at the one or more target frequencies.

公开(公告)号：US20180136400A1

公开(公告)日：2018-05-17

申请号：US15788388

申请日：2017-10-19

Applicant: ADVA Optical Networking SE

Inventor： Benjamin Wohlfeil

IPC: G02B6/293 ,  H04B10/50

CPC classification number: G02B6/29338 ,  G02B6/29343 ,  G02B6/29344 ,  G02B6/29347 ,  G02B6/29389 ,  G02B6/4215 ,  H01S3/08027 ,  H01S5/068 ,  H01S5/141 ,  H04B10/5057 ,  H04B10/572

Abstract: The invention relates to an optical interference filter device which defines a first periodic filter frequency response between a first filter output port and a filter input port and a second periodic filter frequency response having the same free spectral range as the first periodic frequency response between a second filter output port and the filter input port. The first and second periodic filter frequency responses are shifted versus each other by a predetermined optical frequency distance.

公开(公告)号：US20180123698A1

公开(公告)日：2018-05-03

申请号：US15570770

申请日：2015-05-04

Applicant: PLUGTECH PRECISION SYSTEMS LIMITED (SHENZHEN)

Inventor： Yuqi Chen ,  Bing Fang ,  Yongzhan Zhao

IPC: H04B10/516 ,  H04B10/556 ,  H04B10/54 ,  H04B10/564

CPC classification number: H04B10/5161 ,  H04B10/5053 ,  H04B10/5057 ,  H04B10/50575 ,  H04B10/541 ,  H04B10/556 ,  H04B10/564

Abstract: The present disclosure discloses a method and an apparatus for automatically controlling a bias voltage of an optical modulator. The method includes: calculating a new Q bias voltage based on an acquired Q reference phase, a Q harmonic phase, a Q harmonic amplitude, a Q bias voltage and a Q error feedback coefficient, calculating a new I bias voltage based on an I reference phase, an I harmonic phase, an I harmonic amplitude, an I bias voltage and an I error feedback coefficient, and calculating a new P bias voltage based on a P reference phase, a P harmonic phase, a P harmonic amplitude, a P bias voltage and a P error feedback coefficient.

公开(公告)号：US20180054256A1

公开(公告)日：2018-02-22

申请号：US15681912

申请日：2017-08-21

Applicant: OSRAM GmbH

Inventor： Jens Richter ,  Peter Vogt

IPC: H04B10/079 ,  H04B10/50 ,  H04B10/07 ,  H04B10/69 ,  H04B10/67

CPC classification number: H04B10/07953 ,  B60Q11/005 ,  F21S41/176 ,  F21S45/70 ,  H04B10/0705 ,  H04B10/5057 ,  H04B10/50593 ,  H04B10/67 ,  H04B10/69

Abstract: An optical converter is to be simply and reliably monitored. Thereto, a circuit device including a measurement bridge with a measurement branch, a first comparison branch and a second comparison branch is provided. A conductor path loop of the converter can be integrated in the measurement branch. The first comparison branch has a first series resistance variable via a first active element. Similarly, the second comparison branch has a second series resistance variable via a second active element. The first and the second active elements are respectively controllable by the same control signal. The circuit device further has an evaluation circuit with a first comparator and a second comparator, the outputs of which form the control signal and at the same time an output signal of the circuit device in AND-gated manner. Each comparator compares a tap of its respective comparison branch to a tap of the measurement branch.

公开(公告)号：US20170302373A1

公开(公告)日：2017-10-19

申请号：US15482007

申请日：2017-04-07

Applicant: FUJITSU LIMITED

Inventor： Masahiro Yamakami ,  Chikara SHIBAGAKI ,  Jun Endoh ,  Akira Tokieda ,  Seiji Miyata ,  Fusae Yamanouchi

IPC: H04B10/079 ,  H04B10/50 ,  H04J14/02

CPC classification number: H04B10/07955 ,  H04B10/5057 ,  H04B10/588 ,  H04J14/0221

Abstract: An optical module includes an optical modulator that performs optical modulation of transmission data, an optical modulator controller that controls the optical modulator, a memory that stores corresponding relationships between temperatures and set data with which modulation of the optical modulator is to be performed at an operating point voltage, a temperature sensor that measures a temperature in the optical module; and a setting circuit that refers the memory and searches for set data corresponding to measured temperature, and set the set data to the optical modulator controller.

公开(公告)号：US09749057B2

公开(公告)日：2017-08-29

申请号：US14816977

申请日：2015-08-03

Applicant: Juniper Networks, Inc.

Inventor： Yang Yue ,  Bo Zhang ,  Robert C. Lofland ,  Jason T. O'Neil ,  Qiang Wang ,  Jon J. Anderson

IPC: H04B10/04 ,  H04B10/532 ,  H04B10/50

CPC classification number: H04B10/532 ,  H04B10/5053 ,  H04B10/5057

Abstract: An optical device may include a modulator. The modulator may receive an optical signal. The modulator may modulate the optical signal to include a first channel and a second channel. The modulator may modulate the optical signal based on a training pattern associated with detecting a skew. The modulator may cause the first channel to interfere with the second channel. The modulator may perform a power measurement on the first channel and the second channel. The modulator may determine the skew based on the power measurement and the training pattern. The modulator may time delay the first channel or the second channel to align the skew based on the skew.

公开(公告)号：US20170141850A1

公开(公告)日：2017-05-18

申请号：US15418267

申请日：2017-01-27

Applicant: FUJITSU LIMITED

Inventor： Daisuke MASUNAGA ,  Akira TOYOMANE ,  Katsutoshi USAMI ,  Masaaki OKADA

IPC: H04B10/2507 ,  H04B10/2575

CPC classification number: H04B10/2507 ,  H04B10/0799 ,  H04B10/25752 ,  H04B10/25753 ,  H04B10/5057 ,  H04B10/697 ,  H04B2210/254

Abstract: A wireless communication system includes a baseband processing device configured to transmit a data signal via an optical transmission line, and a wireless device configured to receive the data signal via the optical transmission line and carry out wireless transmission of an output signal obtained by amplifying the data signal, wherein the wireless device is configured to amplify the data signal to generate the output signal, generate a feedback signal according to the output signal, and transmit the feedback signal to the baseband processing device via the optical transmission line, and wherein the baseband processing device is configured to acquire the feedback signal from the wireless device, and execute first processing of multiplying the data signal by a distortion compensation coefficient corresponding to an inverse characteristic of distortion in the radio frequency circuit based on the feedback signal.