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1.发明授权
公开(公告)号：EP2486679B1
公开(公告)日：2017-09-06
申请号：EP10821474.3
申请日：2010-10-06
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/2557 , H04B10/2563
CPC分类号： H04B10/2563 , H04B10/2557
摘要： An apparatus (104) mitigates cross-channel nonlinear distortion of an optical signal (138) carried on one of a plurality of wavelength channels (118) in a wavelength division multiplexed (WDM) transmission system (100). The apparatus includes a first optical receiver (126) which is arranged to detect a measure (134) of aggregate optical power of the plurality of wavelength channels. A nonlinear dispersion compensator includes means (144) for applying a phase modulation to the optical signal in proportion to the measure of aggregate optical power.
摘要翻译： 一种装置（104）减轻在波分复用（WDM）传输系统（100）中的多个波长信道（118）中的一个上承载的光信号（138）的交叉信道非线性失真。 该装置包括第一光接收器（126），该第一光接收器被安排来检测多个波长信道的聚合光功率的测量值（134）。 非线性色散补偿器包括用于与光信号的聚集光功率的测量成比例地对光信号施加相位调制的装置（144）。
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公开(公告)号：EP2115907A1
公开(公告)日：2009-11-11
申请号：EP07845413.9
申请日：2007-12-20
申请人： Ofidium Pty Ltd
CPC分类号： H04L27/2627 , H04B10/2543 , H04B10/6163 , H04B2210/254 , H04L25/03343 , H04L27/2096 , H04L27/2697 , H04L27/367 , H04L2025/03414
摘要： A method of transmitting information over a non-linear optical channel includes the step (152) of generating an information-bearing signal, preferably an OFDM signal, which includes a plurality of closely-spaced sub-carriers in the frequency domain. A time-varying phase modulation is determined (154), which is a first function, and preferably a linear function, of the transmitted optical power corresponding with the information-bearing signal. The information-bearing signal and the time-varying phase modulation are applied (156) to an optical source in order to generate a corresponding transmitted optical signal having substantially the stated transmitted optical power characteristic. The first function of transmitted optical power is selected so as to mitigate the effect of the non-linearity of the optical channel upon the transmitted optical signal. In alternative arrangements, a time-varying phase modulation, being a second function of optical power, is computed (162) and applied (164) to a signal received following transmission through a non-linear optical channel. The two alternative arrangements provide, respectively, for pre-compensation and post- compensation of non-linear propagation effects that may be carried out entirely within the electrical domain, for example using digital signal processing techniques.
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公开(公告)号：EP2656519B1
公开(公告)日：2018-08-01
申请号：EP11851343.1
申请日：2011-12-19
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/69 , H04B10/2507
CPC分类号： H04B10/616 , H04B10/2507 , H04B10/697 , H04B10/6971
摘要： An optical signal (116) is modulated with a transmitted electrical signal comprising an information-bearing component (122) and a pilot tone (120) having a predetermined frequency. Transmission of the signal results in distortion, including nonlinear optical transmission impairments. A method of receiving the signal includes detecting the optical signal to produce a received electrical signal (X) comprising a distorted variant of the transmitted electrical signal. The pilot tone is extracted from the received electrical signal using a filtering operation (308) having a predetermined characteristic, and a compensation signal determined based upon the extracted pilot tone. The compensation signal is applied to the received electrical signal (X) to produce a compensated signal (Y) having reduced distortion. The predetermined characteristic of the filtering operation (308) is represented by one or more parameters having values selected so as to substantially maximize a measure of quality of the compensated signal.
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公开(公告)号：EP2260593A1
公开(公告)日：2010-12-15
申请号：EP09712363.2
申请日：2009-02-20
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/148
CPC分类号： H04B10/64 , H04B10/61 , H04B10/614 , H04B10/6151
摘要： An apparatus and method are provided for receiving an optical signal having an optical carrier component and at least one information-bearing optical sideband. In general, an optical filter arrangement (110) is used to separate the optical carrier component from the information-bearing optical sideband. First and second optical splitters (126, 128) divide the optical power in the optical carrier and the optical sideband, respectively, into corresponding sub-components. The sub-components of the optical carrier have substantially orthogonal polarisation states, which is an optional characteristic of the sideband sub-components. First and second optical coupling devices (142, 144) respectively each combine one of the optical carrier sub-components with a corresponding one of the optical sideband sub-components. Optical detectors (158, 160) detect the outputs of the combiners (142, 144). The arrangement is able to achieve a number of the benefits of coherent optical heterodyne receivers, particularly when used in combination with advanced coding and modulation methods, while avoiding the need, and associated complexity, of providing an optical oscillator at the receiver.
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公开(公告)号：EP2260593B1
公开(公告)日：2014-08-06
申请号：EP09712363.2
申请日：2009-02-20
申请人： Ofidium Pty Ltd
CPC分类号： H04B10/64 , H04B10/61 , H04B10/614 , H04B10/6151
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公开(公告)号：EP2656519A1
公开(公告)日：2013-10-30
申请号：EP11851343.1
申请日：2011-12-19
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/18
CPC分类号： H04B10/616 , H04B10/2507 , H04B10/697 , H04B10/6971
摘要： An optical signal (116) is modulated with a transmitted electrical signal comprising an information-bearing component (122) and a pilot tone (120) having a predetermined frequency. Transmission of the signal results in distortion, including nonlinear optical transmission impairments. A method of receiving the signal includes detecting the optical signal to produce a received electrical signal (X) comprising a distorted variant of the transmitted electrical signal. The pilot tone is extracted from the received electrical signal using a filtering operation (308) having a predetermined characteristic, and a compensation signal determined based upon the extracted pilot tone. The compensation signal is applied to the received electrical signal (X) to produce a compensated signal (Y) having reduced distortion. The predetermined characteristic of the filtering operation (308) is represented by one or more parameters having values selected so as to substantially maximise a measure of quality of the compensated signal.
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公开(公告)号：EP2486679A2
公开(公告)日：2012-08-15
申请号：EP10821474.3
申请日：2010-10-06
申请人： Ofidium Pty Ltd
CPC分类号： H04B10/2563 , H04B10/2557
摘要： An apparatus (104) mitigates cross-channel nonlinear distortion of an optical signal (138) carried on one of a plurality of wavelength channels (118) in a wavelength division multiplexed (WDM) transmission system (100). The apparatus includes a first optical receiver (126) which is arranged to detect a measure (134) of aggregate optical power of the plurality of wavelength channels. A nonlinear dispersion compensator includes means (144) for applying a phase modulation to the optical signal in proportion to the measure of aggregate optical power.
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公开(公告)号：EP2543150B1
公开(公告)日：2018-05-30
申请号：EP11750073.6
申请日：2011-03-01
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/61 , H04B10/2507
CPC分类号： H04B10/25073 , H04B10/6161 , H04B10/6163 , H04B10/6971
摘要： An equalizer (200) for equalization of a signal transmitted via an optical fiber link from a transmitter to a corresponding receiver employs a backpropagation model (300) which comprises one or more sequential segments collectively representing an inverse fiber link. Each sequential segment comprises a linear backpropagation element (304), and a non-linear backpropagation element (306) having an associated compensation bandwidth (312). The equalizer (200) generates a distortion-mitigated signal by computing, for each sequential segment in turn, a first linear compensated signal from a signal input to the segment in accordance with the linear backpropagation element (304), and a non-linear compensated signal from the first linear compensated signal in accordance with the non-linear backpropagation element (306). Computation of the non-linear compensation signal comprises limiting a bandwidth of a compensation signal derived from the first linear compensated signal in accordance with the associated compensation bandwidth (312).
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公开(公告)号：EP2115907B1
公开(公告)日：2017-11-01
申请号：EP07845413.9
申请日：2007-12-20
申请人： Ofidium Pty Ltd
CPC分类号： H04L27/2627 , H04B10/2543 , H04B10/6163 , H04B2210/254 , H04L25/03343 , H04L27/2096 , H04L27/2697 , H04L27/367 , H04L2025/03414
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10.发明公开METHOD AND SYSTEM FOR NON-LINEARITY COMPENSATION IN OPTICAL TRANSMISSION SYSTEMS 有权方法和系统的非线性光传输系统中补偿
公开(公告)号：EP2543150A2
公开(公告)日：2013-01-09
申请号：EP11750073.6
申请日：2011-03-01
申请人： Ofidium Pty Ltd
IPC分类号： H04B10/18
CPC分类号： H04B10/25073 , H04B10/6161 , H04B10/6163 , H04B10/6971
摘要： An equaliser (200) for equalisation of a signal transmitted via an optical fibre link from a transmitter to a corresponding receiver employs a backpropagation model (300) which comprises one or more sequential segments collectively representing an inverse fibre link. Each sequential segment comprises a linear backpropagation element (304), and a non-linear backpropagation element (306) having an associated compensation bandwidth (312). The equaliser (200) generates a distortion-mitigated signal by computing, for each sequential segment in turn, a first linear compensated signal from a signal input to the segment in accordance with the linear backpropagation element (304), and a non-linear compensated signal from the first linear compensated signal in accordance with the non-linear backpropagation element (306). Computation of the non-linear compensation signal comprises limiting a bandwidth of a compensation signal derived from the first linear compensated signal in accordance with the associated compensation bandwidth (312).
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