公开(公告)号：US20180331762A1

公开(公告)日：2018-11-15

申请号：US16024980

申请日：2018-07-02

申请人： Qunbi ZHUGE ,  Kevin FARLEY ,  Kim B. ROBERTS ,  Maurice O'SULLIVAN

发明人： Qunbi ZHUGE ,  Kevin FARLEY ,  Kim B. ROBERTS ,  Maurice O'SULLIVAN

IPC分类号： H04B10/40 ,  H04B10/61 ,  H04B10/588 ,  H04B10/556 ,  H04L7/00 ,  H04L1/00 ,  H04B10/079

CPC分类号： H04B10/40 ,  H04B10/0799 ,  H04B10/5561 ,  H04B10/588 ,  H04B10/616 ,  H04L1/0042 ,  H04L7/0075

摘要： A digital instruction is generated regarding one or more electrical-to-optical conversion impairments induced at the transmitter of an optical communication system. The digital instruction may be used by the transmitter to reduce the impairments. Alternatively, or additionally, the digital instruction may be used by the receiver of the optical communication system to compensate for the impairments

公开(公告)号：US20180294888A1

公开(公告)日：2018-10-11

申请号：US15946202

申请日：2018-04-05

申请人： Fujitsu Optical Components Limited

发明人： Sukeyuki IWATA ,  Toshiki TANAKA ,  Masato NISHIHARA ,  Naoki KUWATA

IPC分类号： H04B10/588 ,  H04B10/54 ,  H04B10/61

CPC分类号： H04B10/588 ,  H04B10/541 ,  H04B10/61

摘要： An optical transmitter includes an optical modulator configured to modulate light from a light source; and a processor configured to generate a drive signal that is input into the optical modulator. The processor inserts a bias control signal amplitude-modulated at a low frequency, into an analog signal at fixed intervals, to generate the drive signal.

公开(公告)号：US10084619B2

公开(公告)日：2018-09-25

申请号：US15385523

申请日：2016-12-20

申请人： INTERNATIONAL BUSINESS MACHINES CORPORATION

发明人： Nicolas Dupuis ,  Tam N. Huynh ,  Benjamin G. Lee ,  Jonathan E. Proesel ,  Renato Rimolo-Donadio ,  Alexander V. Rylyakov ,  Clint L. Schow

IPC分类号： H04B10/516 ,  G02F1/21 ,  G02F1/17 ,  H04L25/03

CPC分类号： H04L25/03076 ,  G02F1/17 ,  G02F1/21 ,  G02F2001/212 ,  H04B10/516 ,  H04B10/588 ,  H04B2210/254 ,  H04L25/03114

摘要： A method and system of optical communication are provided. An optical modulator device includes a first and a second waveguide segment, and is configured to modulate an incident optical signal. A first feed-forward equalization (FFE) circuit including an inner first tap and an inner second tap, is configured to equalize the first waveguide segment. A second FFE circuit including a first inner tap and a second inner tap, is configured to equalize the second waveguide segment. An FFE recombination of the first inner tap and the second inner tap of the first and second FFE circuits, is in the electrical domain, respectively. An FFE recombination of the first and second modulation signals, operative to equalize a combination of the first second waveguide segments, is in the optical domain.

公开(公告)号：US20180262376A1

公开(公告)日：2018-09-13

申请号：US15974489

申请日：2018-05-08

申请人： Huawei Technologies Co., Ltd.

发明人： Lei Liu ,  Yuanyuan Fang ,  Shupeng Deng ,  Chi Yan Wong

IPC分类号： H04L27/20 ,  H04L27/00 ,  H04B10/25 ,  H04L27/26

CPC分类号： H04L27/2096 ,  G02F1/00 ,  G02F1/225 ,  H04B10/25 ,  H04B10/5053 ,  H04B10/588 ,  H04L27/0008 ,  H04L27/20 ,  H04L27/26

摘要： Embodiments of the present disclosure disclose a modulator, including: a first modulation module, configured to: receive first to-be-modulated data, and output a first transmission curve according to the first to-be-modulated data; a second modulation module, configured to: receive second to-be-modulated data, and output a second transmission curve according to the second to-be-modulated data, where a period of the second transmission curve is half of a period of the first transmission curve; and a combination module, configured to perform phase superposition on the first transmission curve and the second transmission curve, to obtain a combined linear result. In addition, this solution further provides a modulation system and a method for implementing higher order modulation, so that a linear result that can be modulated can be obtained by controlling a superposition ratio between transmission curves, to implement linear curve transmission.

公开(公告)号：US09941970B2

公开(公告)日：2018-04-10

申请号：US15223724

申请日：2016-07-29

申请人： INPHI CORPORATION

发明人： Hari Shankar

IPC分类号： H04B10/516 ,  H04B10/588 ,  H04B10/2575 ,  H04B10/50

CPC分类号： H04B10/516 ,  H04B10/2575 ,  H04B10/50572 ,  H04B10/50593 ,  H04B10/588

摘要： The present invention is directed to optical communication systems and methods thereof. In various embodiments, the present invention provides method for linearizing Mach Zehnder modulators by digital pre-compensation and adjusting the gain of the driver and/or the modulation index. The pre-compensation can be implemented as a digital pre-compensation algorithm, which is a part of an adaptive feedback loop. There are other embodiments as well.

公开(公告)号：US20180054258A1

公开(公告)日：2018-02-22

申请号：US15649689

申请日：2017-07-14

申请人： FUJITSU LIMITED

发明人： Toshihiko Mori ,  Yuuki Ogata

IPC分类号： H04B10/548 ,  H04B10/61 ,  H04B10/40

CPC分类号： H04B10/548 ,  H04B10/40 ,  H04B10/504 ,  H04B10/588 ,  H04B10/6164

摘要： A frequency characteristic adjustment circuit is disclosed. The frequency characteristic adjustment circuit is disposed between an optical circuit element and a drive circuit for driving the optical circuit element. A capacitor is connected to an output of the drive circuit. A current supply circuit is controlled by a voltage generated by the drive circuit. The current supply circuit supplies a different current value depending on a voltage received from the drive circuit to the optical circuit element.

公开(公告)号：US20180026723A1

公开(公告)日：2018-01-25

申请号：US15655277

申请日：2017-07-20

申请人： Photonic Systems, Inc.

发明人： Edward I. Ackerman ,  Gary E. Betts ,  Charles H. Cox

IPC分类号： H04B10/50 ,  H04B10/564 ,  H04B10/588

CPC分类号： H04B10/50575 ,  G02F1/0123 ,  G02F1/225 ,  H04B10/506 ,  H04B10/54 ,  H04B10/564 ,  H04B10/588

摘要： A linearized electro-optic modulator includes a substrate comprising a first Mach Zehnder interferometer comprising a first and second optical waveguide and a second Mach Zehnder interferometer comprising a first and a second optical waveguide. A signal electrode is positioned on the substrate to receive a modulation signal. First and second ground electrodes are positioned on the substrate and are electrically connected to ground potential. The signal electrode and the first and second ground electrodes are positioned so that an electric field generated by the signal electrode modulates both the first and second Mach Zehnder interferometers to generate a first and a second linearized modulated optical signal.

公开(公告)号：US20170302373A1

公开(公告)日：2017-10-19

申请号：US15482007

申请日：2017-04-07

申请人： FUJITSU LIMITED

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

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

CPC分类号： H04B10/07955 ,  H04B10/5057 ,  H04B10/588 ,  H04J14/0221

摘要： 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：US20170222725A1

公开(公告)日：2017-08-03

申请号：US15488507

申请日：2017-04-16

申请人： Finisar Corporation

发明人： Suhas P. Bhandare ,  Heider N. Ereifej ,  Ihab E. Khalouf ,  Mark Colyar

IPC分类号： H04B10/54 ,  H04B10/508

CPC分类号： H04B10/54 ,  H04B10/07955 ,  H04B10/508 ,  H04B10/516 ,  H04B10/564 ,  H04B10/58 ,  H04B10/588

摘要： A method and apparatus for characterizing and compensating optical impairments in an optical transmitter includes operating an optical transmitter comprising a first and second parent MZ, each comprising a plurality of child MZ modulators that are biased at respective initial operating points. An electro-optic RF transfer function is generated for each of the plurality of child MZ modulators. Curve fitting parameters are determined for each of the plurality of electro-optic RF transfer functions and operating points of each child MZ modulator are determined using the curve fitting parameters. An IQ power imbalance is determined using the curve fitting parameters. Initial RF drive power levels are determined that compensate for the determined IQ power imbalance. The XY power imbalance is determined for initial RF drive power levels using the curve fitting parameters. The operating RF drive powers are determined that at least partially compensate for the first and second IQ power imbalances and for the XY power imbalance for the optical transmitter.

公开(公告)号：US20160269121A1

公开(公告)日：2016-09-15

申请号：US14730782

申请日：2015-06-04

申请人： Alcatel-Lucent USA Inc.

发明人： Sian Chong J. Lee ,  Noriaki Kaneda

IPC分类号： H04B10/54 ,  H04B10/524

CPC分类号： H04B10/54 ,  H04B10/524 ,  H04B10/541 ,  H04B10/588

摘要： An apparatus includes an optical modulator and an electrical driver. The electrical driver is configured to provide to the modulator an input drive signal comprising multiple input electrical drive levels of a pulse-amplitude modulation (PAM) signal. The electrical driver is further configured to provide unequal spacing between adjacent ones of the multiple input electrical drive levels, and is still further configured to provide a non-zero bias to the input drive signal. The electrical driver may be a component of an optical transmitter, and the input drive signal may be a differential drive signal. The electrical driver may be further configured such that the bias configures the modulator to produce PAM-modulated optical field output levels that are more evenly spaced than the input electrical drive levels.

摘要翻译： 一种装置包括光调制器和电驱动器。 电驱动器被配置为向调制器提供包括脉冲幅度调制（PAM）信号的多个输入电驱动电平的输入驱动信号。 电驱动器还被配置为在多个输入电驱动电平中的相邻输入电驱动电平之间提供不相等的间隔，并且还被配置为向输入驱动信号提供非零偏置。 电驱动器可以是光发射机的组件，并且输入驱动信号可以是差分驱动信号。 可以进一步配置电驱动器，使得偏置配置调制器以产生与输入电驱动电平更均匀间隔的PAM调制的光场输出电平。