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公开(公告)号：US20140294393A1
公开(公告)日：2014-10-02
申请号：US14002856
申请日：2012-03-02
IPC分类号： H04J14/02 , H04L27/26 , H04B10/2575
CPC分类号： H04J14/0298 , H04B10/2575 , H04B10/548 , H04L5/0007 , H04L5/0046 , H04L27/2601
摘要： A method for transmitting digital information having a predetermined bit-rate (B) via a nonlinear optical channel includes determining a combination of transmission parameters comprising a number (N) of subcarriers, an information symbol rate (S) for each subcarrier, and a number (b) of bits per symbol on each subcarrier, such that B=NSb. An optical signal is generated comprising the plurality (N) of orthogonal optical subcarriers. Each subcarrier is modulated to carry a proportion (Sb/B) of the total bit-rate (B) of the digital information. The optical signal is then transmitted to a corresponding optical receiver via the nonlinear optical channel. The received signal has a measurable signal quality (Q) which is a function of the transmission parameters (N, S, b). Determining the combination of transmission parameters comprises selecting the parameters such that the associated signal quality is greater than a corresponding quality for a single-carrier transmission, and greater than a corresponding quality employing a larger number (M>N) of subcarriers.
摘要翻译： 一种用于经由非线性光信道发送具有预定比特率（B）的数字信息的方法包括：确定包括数量（N）个子载波的传输参数，每个子载波的信息符号率（S）和数字 （b）每个子载波上每符号的位数，使得B = NSb。 生成包括多个（N）个正交光子载波的光信号。 每个子载波被调制以承载数字信息的总比特率（B）的比例（Sb / B）。 然后，光信号经由非线性光信道被发送到对应的光接收机。 接收到的信号具有作为传输参数（N，S，b）的函数的可测量信号质量（Q）。 确定传输参数的组合包括选择参数，使得相关联的信号质量大于单载波传输的相应质量，并且大于使用较大数量（M> N）个子载波的相应质量。
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公开(公告)号：US09236951B2
公开(公告)日：2016-01-12
申请号：US13996562
申请日：2011-12-19
IPC分类号： H04B10/00 , H04B10/61 , 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.
摘要翻译： 用包括具有预定频率的信息承载组件（122）和导频音（120）的传输电信号调制光信号（116）。 信号的传输导致失真，包括非线性光学传输损伤。 接收信号的方法包括检测光信号以产生包括所发射的电信号的失真变体的接收电信号（X）。 使用具有预定特性的滤波操作（308）从接收的电信号中提取导频音，以及基于所提取的导频音来确定的补偿信号。 补偿信号被施加到接收的电信号（X）以产生具有减小的失真的补偿信号（Y）。 滤波操作（308）的预定特性由具有被选择的值的一个或多个参数表示，以使得补偿信号的质量的量度基本上最大化。
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公开(公告)号：US20100247099A1
公开(公告)日：2010-09-30
申请号：US12445386
申请日：2007-12-20
申请人： Arthur Lowery , Liang Bangyuan Du
发明人： Arthur Lowery , Liang Bangyuan Du
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.
摘要翻译： 通过非线性光信道发送信息的方法包括生成信息承载信号（优选地，OFDM信号）的步骤（152），OFDM信号包括在频域中的多个紧密间隔的子载波。 确定时变相位调制（154），其是与信息承载信号相对应的发射光功率的第一函数，并且优选地是线性函数。 将信息承载信号和时变相位调制（156）应用于光源，以便产生具有基本上所述的传输光功率特性的对应的传输光信号。 选择发射光功率的第一功能是为了减轻光信道对发射光信号的非线性的影响。 在替代布置中，作为光功率的第二功能的时变相位调制被计算（162）并且应用于（164）到通过非线性光信道传输之后接收的信号。 两种替代方案分别提供了可以完全在电域范围内进行的非线性传播效应的预补偿和后补偿，例如使用数字信号处理技术。
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公开(公告)号：US09294216B2
公开(公告)日：2016-03-22
申请号：US14002856
申请日：2012-03-02
IPC分类号： H04J14/02 , H04L5/00 , H04B10/548 , H04B10/2575 , H04L27/26
CPC分类号： H04J14/0298 , H04B10/2575 , H04B10/548 , H04L5/0007 , H04L5/0046 , H04L27/2601
摘要： A method for transmitting digital information having a predetermined bit-rate (B) via a nonlinear optical channel includes determining a combination of transmission parameters comprising a number (N) of subcarriers, an information symbol rate (S) for each subcarrier, and a number (b) of bits per symbol on each subcarrier, such that B=NSb. An optical signal is generated comprising the plurality (N) of orthogonal optical subcarriers. Each subcarrier is modulated to carry a proportion (Sb/B) of the total bit-rate (B) of the digital information. The optical signal is then transmitted to a corresponding optical receiver via the nonlinear optical channel. The received signal has a measurable signal quality (Q) which is a function of the transmission parameters (N, S, b). Determining the combination of transmission parameters comprises selecting the parameters such that the associated signal quality is greater than a corresponding quality for a single-carrier transmission, and greater than a corresponding quality employing a larger number (M>N) of subcarriers.
摘要翻译： 一种用于经由非线性光信道发送具有预定比特率（B）的数字信息的方法包括：确定包括数量（N）个子载波的传输参数，每个子载波的信息符号率（S）和数字 （b）每个子载波上每符号的位数，使得B = NSb。 生成包括多个（N）个正交光子载波的光信号。 每个子载波被调制以承载数字信息的总比特率（B）的比例（Sb / B）。 然后，光信号经由非线性光信道被发送到对应的光接收机。 接收到的信号具有作为传输参数（N，S，b）的函数的可测量信号质量（Q）。 确定传输参数的组合包括选择参数，使得相关联的信号质量大于单载波传输的相应质量，并且大于使用较大数量（M> N）个子载波的相应质量。
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5.发明授权Method and system for non-linearity compensation in optical transmission systems 有权光传输系统中非线性补偿的方法和系统公开(公告)号：US09002210B2
公开(公告)日：2015-04-07
申请号：US13582510
申请日：2011-03-01
IPC分类号： H04B10/12 , H04B10/2507 , H04B10/69
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).
摘要翻译： 用于使通过光纤链路从发射机传输到相应接收机的信号的均衡的均衡器（200）采用反向传播模型（300），其包括一个或多个连续表示反向光纤链路的连续段。 每个顺序段包括线性反向传播元件（304）和具有相关联的补偿带宽（312）的非线性反向传播元件（306）。 均衡器（200）通过根据线性反向传播元件（304）计算从输入到片段的信号的第一线性补偿信号，对于每个顺序段，生成失真缓解信号，以及非线性补偿 来自第一线性补偿信号的信号根据非线性反向传播元件（306）。 非线性补偿信号的计算包括根据相关联的补偿带宽来限制从第一线性补偿信号导出的补偿信号的带宽（312）。
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公开(公告)号：US20120263461A1
公开(公告)日：2012-10-18
申请号：US13500158
申请日：2010-10-06
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）中承载在多个波长信道（118）之一上的光信号（138）的跨信道非线性失真。 该装置包括第一光接收器（126），其被布置成检测多个波长信道的总光功率的测量（134）。 非线性色散补偿器包括用于与聚合光功率的测量成比例地向光信号施加相位调制的装置（144）。
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公开(公告)号：US08112001B2
公开(公告)日：2012-02-07
申请号：US12445386
申请日：2007-12-20
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.
摘要翻译： 通过非线性光信道发送信息的方法包括生成信息承载信号（优选地，OFDM信号）的步骤（152），OFDM信号包括在频域中的多个紧密间隔的子载波。 确定时变相位调制（154），其是与信息承载信号相对应的发射光功率的第一函数，并且优选地是线性函数。 将信息承载信号和时变相位调制（156）应用于光源，以便产生具有基本上所述的传输光功率特性的对应的传输光信号。 选择发射光功率的第一功能是为了减轻光信道对发射光信号的非线性的影响。 在替代布置中，作为光功率的第二功能的时变相位调制被计算（162）并且应用于（164）到通过非线性光信道传输之后接收的信号。 两种替代方案分别提供了可以完全在电域范围内进行的非线性传播效应的预补偿和后补偿，例如使用数字信号处理技术。
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公开(公告)号：US09614617B2
公开(公告)日：2017-04-04
申请号：US13500158
申请日：2010-10-06
IPC分类号： H04B10/00 , H04B10/2563 , H04B10/2557
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：US20140286642A1
公开(公告)日：2014-09-25
申请号：US13996562
申请日：2011-12-19
IPC分类号： H04B10/61
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.
摘要翻译： 用包括具有预定频率的信息承载组件（122）和导频音（120）的传输电信号调制光信号（116）。 信号的传输导致失真，包括非线性光学传输损伤。 接收信号的方法包括检测光信号以产生包括所发射的电信号的失真变体的接收的电信号（X）。 使用具有预定特性的滤波操作（308）从接收的电信号中提取导频音，以及基于所提取的导频音来确定的补偿信号。 补偿信号被施加到接收的电信号（X）以产生具有减小的失真的补偿信号（Y）。 滤波操作（308）的预定特性由具有被选择的值的一个或多个参数表示，以使得补偿信号的质量的量度基本上最大化。
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公开(公告)号：US08655177B2
公开(公告)日：2014-02-18
申请号：US13123007
申请日：2009-02-27
IPC分类号： H04B10/00
CPC分类号： H04L27/223 , H04B10/25759 , H04L27/2096
摘要： A method of generating an information-bearing optical signal (614) from input digital information (602) includes generating (604, 606) an information-bearing electrical signal comprising an in-phase (I) component and a quadrature (Q) component. Each of the components has a predetermined baseband bandwidth requirement (B). The I and Q signal components are combined (610) with corresponding I and Q components of a radio frequency (RF) carrier (608). The carrier has a central frequency greater than the signal bandwidth requirement (B). An optical source is modulated (612) with the combined I and Q signal and carrier components, in order to produce a modulated optical signal (614) which comprises an optical carrier corresponding with the RF carrier, and substantially only a single information-bearing optical sideband in an optical frequency domain, corresponding with the information-bearing electrical signals. Transmitters implementing the method are also disclosed.
摘要翻译： 从输入数字信息（602）生成信息承载光信号（614）的方法包括：生成（604,606）包括同相（I）分量和正交（Q）分量的信息承载电信号。 每个组件具有预定的基带带宽要求（B）。 I和Q信号分量与射频（RF）载波（608）的相应I和Q分量组合（610）。 载波的中心频率大于信号带宽要求（B）。 光源与组合的I和Q信号和载波分量被调制（612），以便产生调制的光信号（614），其包括与RF载波对应的光载波，并且基本上只有一个信息载体的光信号 边带在光频域中，与信息载运电信号相对应。 还公开了实现该方法的发射机。
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