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公开(公告)号：US11742978B2
公开(公告)日：2023-08-29
申请号：US17554096
申请日：2021-12-17
申请人： FUJITSU LIMITED
IPC分类号： H04B10/25 , H04J14/06 , H04B10/2513 , H04B10/2507
CPC分类号： H04J14/06 , H04B10/2513 , H04B10/2572
摘要： An optical network device includes a receiver that receives a polarization multiplexed optical signal and a processor. The processor separates an electric field information signal indicating the polarization multiplexed optical signal into first and second polarization components orthogonal to each other, generates third and fourth polarization components by controlling the first and second polarization components, calculates an evaluation value corresponding to a power of the third or fourth polarization component for each of a plurality of positions on a transmission line, calculates a variation in the evaluation value for a control amount for each of the plurality of positions, and decides whether a first position is a position to be detected based on a result of comparing a variation in an evaluation value for the first position with a variation in an evaluation value for a second position adjacent to the first position.
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公开(公告)号：US11683093B2
公开(公告)日：2023-06-20
申请号：US17614686
申请日：2019-06-06
发明人： Masanori Nakamura , Seiji Okamoto , Kengo Horikoshi , Shuto Yamamoto , Takayuki Kobayashi , Yoshiaki Kisaka , Masahito Tomizawa
IPC分类号： H04B10/06 , H04B10/2513 , H03H17/02 , H04B10/61
CPC分类号： H04B10/2513 , H03H17/0213 , H04B10/61 , H04B10/616
摘要： An electric digital received signal obtained from a received optical signal is segmented into blocks of a certain length with an overlap of a length determined in advance with an adjacent block. Fourier transformation is performed for each of the blocks. The blocks subjected to the Fourier transformation are stored consecutively in time series, a coefficient determined based on a wavelength dispersion compensation amount according to one of frequency positions and a delay amount according to one of the frequency positions and one of time positions is applied to each of frequency component values included in a plurality of the stored blocks, and the blocks to which the coefficient has been applied and which are obtained by adding up the frequency component values to which the coefficient has been applied for each of the frequency positions are generated. Inverse Fourier transformation is performed on the generated blocks to which the coefficient has been applied. A part of the overlap subjected to the inverse Fourier transformation is removed.
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公开(公告)号：US20190036609A1
公开(公告)日：2019-01-31
申请号：US16120436
申请日：2018-09-03
发明人： Dekun LIU , Shengping LI
IPC分类号： H04B10/50 , H04J14/02 , H04B10/2507 , H04B10/27 , H04J14/08
CPC分类号： H04B10/504 , H04B10/2507 , H04B10/2513 , H04B10/27 , H04J14/02 , H04J14/0202 , H04J14/08
摘要： A multiplexer/demultiplexer and a passive optical network system are provided. The multiplexer/demultiplexer includes N optical multiplexing/demultiplexing modules. The optical multiplexing/demultiplexing modules multiplex signals with different wavelengths from a plurality of ports to a same port, or demultiplex signals with different wavelengths from one port to different ports. The N optical multiplexing/demultiplexing modules correspond to the signals with different wavelengths. In the optical multiplexing/demultiplexing modules, a negative dispersion amount and an insertion loss of an Mth optical multiplexing/demultiplexing module are less than those of an (M+1)th optical multiplexing/demultiplexing module, where N is a positive integer, and M is a positive integer less than or equal to N. The multiplexer/demultiplexer and the passive optical network system increase an optical power budget between an optical transmitter and an optical transceiver.
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公开(公告)号：US20180234184A1
公开(公告)日：2018-08-16
申请号：US15896152
申请日：2018-02-14
申请人： FUJITSU LIMITED
发明人： Takahito Tanimura , Takeshi Hoshida
IPC分类号： H04B10/2513 , H04B10/079 , H04B10/61
CPC分类号： H04B10/2513 , H04B10/079 , H04B10/0795 , H04B10/07951 , H04B10/2543 , H04B10/616 , H04B10/6161 , H04B10/6163
摘要： There is provided a monitor device for monitoring a transmission line including a memory, and a processor coupled to the memory and configured to compensate for a portion of chromatic dispersion on electric signals indicating an electric field component of an optical signal, compensate for deterioration due to a nonlinear optical effect on the electric signals on which the portion of chromatic dispersion is compensated, compensate for a remaining chromatic dispersion except for the portion of chromatic dispersion on the electric signals on which the deterioration due to the nonlinear optical effect is compensated, evaluate quality of the electric signals on which remaining chromatic dispersion except for the portion of chromatic dispersion are compensated, and acquire a first compensation amount of the portion of chromatic dispersion and a second compensation amount of the deterioration due to the nonlinear optical effect, when the evaluated quality satisfies a predetermined condition.
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公开(公告)号：US09991960B2
公开(公告)日：2018-06-05
申请号：US15722948
申请日：2017-10-02
发明人： Xiang Liu , Frank Effenberger
IPC分类号： H04B10/60 , H04B10/27 , H04J14/00 , H04B10/2513 , H04B10/61
CPC分类号： H04B10/2513 , H04B10/614 , H04B10/6161
摘要： An apparatus comprises a polarization-diversity optical hybrid that converts an optical signal into a plurality of optical signals comprising a first polarization component and a second polarization component orthogonal to the first polarization component, one or more detectors that convert the plurality of optical signals into a plurality of first analog electrical signals, DC blocking elements that remove DC signal components to output a plurality of second analog electrical signals, analog to digital converters (ADCs) coupled to the DC blocking elements that convert the plurality of second analog electrical signals into a plurality of digital signals, and a digital signal processing (DSP) unit coupled to the ADCs. The DSP is configured to perform a fiber dispersion compensation on the plurality of digital signals and add DC offsets to output a plurality of DC-restored compensated digital signals.
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公开(公告)号：US09923641B2
公开(公告)日：2018-03-20
申请号：US14779135
申请日：2013-09-19
申请人： NEC Corporation
发明人： Wakako Yasuda , Junichi Abe , Daisaku Ogasahara
IPC分类号： H04B10/61 , H04B10/2513
CPC分类号： H04B10/6161 , H04B10/2513 , H04B10/25133 , H04B10/613 , H04B10/614 , H04B10/6163 , H04B10/6165
摘要： An optical receiver (20) includes an electrical signal generation unit (200), a first phase compensation unit (101), a distortion compensation unit (102), and a first dispersion compensation unit (400). The electrical signal generation unit (200) generates an electrical signal on the basis of received signal light. The first phase compensation unit (101) performs a phase rotation compensation process on the electrical signal generated by the electrical signal generation unit (200). The distortion compensation unit (102) performs a dispersion compensation process and a phase rotation compensation process in this order, at least once, on the electrical signal after having compensation performed thereon by the first phase compensation unit. The electrical signal generation unit (200), the first phase compensation unit (101), and the distortion compensation unit (102) are incorporated into one semiconductor device.
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公开(公告)号：US20180026719A1
公开(公告)日：2018-01-25
申请号：US15722948
申请日：2017-10-02
发明人： Xiang LIU , Frank EFFENBERGER
IPC分类号： H04B10/2513 , H04B10/61
CPC分类号： H04B10/2513 , H04B10/614 , H04B10/6161
摘要： An apparatus comprises a polarization-diversity optical hybrid that converts an optical signal into a plurality of optical signals comprising a first polarization component and a second polarization component orthogonal to the first polarization component, one or more detectors that convert the plurality of optical signals into a plurality of first analog electrical signals, DC blocking elements that remove DC signal components to output a plurality of second analog electrical signals, analog to digital converters (ADCs) coupled to the DC blocking elements that convert the plurality of second analog electrical signals into a plurality of digital signals, and a digital signal processing (DSP) unit coupled to the ADCs. The DSP is configured to perform a fiber dispersion compensation on the plurality of digital signals and add DC offsets to output a plurality of DC-restored compensated digital signals.
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8.发明授权公开(公告)号：US09876569B2
公开(公告)日：2018-01-23
申请号：US14884107
申请日：2015-10-15
发明人： Xiang Zhou
IPC分类号： H04B10/06 , H04J14/06 , H04B10/2513 , H04B10/516 , H04B10/2575 , H04L25/03 , H04B10/61
CPC分类号： H04B10/2513 , H04B10/2575 , H04B10/516 , H04B10/61 , H04B10/6164 , H04B10/6165 , H04L25/03 , H04L25/0305
摘要： A method and system for simultaneous mitigation of optical impairment from both equalizer-phase noise interaction (EPNI) and fiber nonlinear effects (FNE) is disclosed. In one embodiment, the method is directed to simultaneous mitigation of optical impairment from both equalizer-phase noise interaction (EPNI) and fiber nonlinear effects (FNE) using a fast-adaptive multi-tap digital filter.
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公开(公告)号：US20170155448A1
公开(公告)日：2017-06-01
申请号：US14954473
申请日：2015-11-30
发明人： Murali Krishnan , Qing Guo , Samina Chowdhury , Fei Zhu , Yu Sheng Bai
IPC分类号： H04B10/2513 , H04L25/02 , H04B10/2569
CPC分类号： H04B10/2513 , H04B10/2569 , H04B10/29 , H04L25/022 , H04L25/0224 , H04L25/03159
摘要： An optical transceiver in an optical communications network, comprising a receiver configured to receive an optical signal comprising an X-polarization component that comprises a first frame and a Y-polarization component that comprises a second frame. The optical transceiver also comprises a processor coupled to the receiver and configured to determine, in a time domain, a phase estimate according to the first frame and the second frame, determine, in a frequency domain, a channel estimate for the optical signal according to a relationship between the first frame, the second frame, and the phase estimate, and determine a compensated optical signal according to the channel estimate. The optical transceiver further comprises a transmitter coupled to the processor and configured to transmit the compensated optical signal to a downstream component in the optical communications network.
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公开(公告)号：US20170149503A1
公开(公告)日：2017-05-25
申请号：US15424587
申请日：2017-02-03
发明人： Xiang Liu , Frank Effenberger
IPC分类号： H04B10/2513 , H04B10/2575
CPC分类号： H04B10/2513 , H04B10/2507 , H04B10/25137 , H04B10/2575 , H04B10/25752
摘要： An apparatus comprising a digital signal processor (DSP) unit configured to perform fiber dispersion pre-compensation on a digital signal sequence based on a dispersion value to produce a pre-compensated signal, wherein the dispersion value is associated with a remote optical receiver, a plurality of digital-to-analog converters (DACs) coupled to the DSP unit and configured to convert the pre-compensated signal into analog electrical signals, and a frontend coupled to the DACs and configured to convert the analog electrical signals into a first optical signal, adding a constant optical electric (E)-field to the first optical signal to produce a second optical signal, and transmit the second optical signal to the remote optical receiver.
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