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公开(公告)号：US20160344482A1
公开(公告)日：2016-11-24
申请号：US14717762
申请日：2015-05-20
IPC分类号： H04B10/58 , H04J14/02 , H04B10/2507 , H04B10/564 , H04B10/2557
CPC分类号： H04B10/58 , H04B10/2557 , H04B10/2563 , H04B10/2572 , H04B10/564 , H04B2210/254 , H04J14/0221
摘要： A method for preventing nonlinear interference in an optical communication system. The method may include selecting an optical signal of a first optical channel. The method may include determining an estimate of inter-channel nonlinear interference to the optical signal of the first optical channel. The inter-channel nonlinear interference may be generated by one or more optical signals transmitted over a second optical channel in the optical communication system. The method may include determining one or more linear filters based on the estimate of the inter-channel nonlinear interference. The method may include pre-distorting an optical signal for transmission over the second optical channel using the one or more linear filters. The pre-distorted optical signal may be configured for reducing the inter-channel nonlinear interference to the first optical signal of the first optical channel. The method may include transmitting the pre-distorted optical signal over the second optical channel through an optical transmission medium.
摘要翻译： 一种用于防止光通信系统中的非线性干扰的方法。 该方法可以包括选择第一光信道的光信号。 该方法可以包括确定对第一光学信道的光信号的信道间非线性干扰的估计。 信道间非线性干扰可以由在光通信系统中通过第二光信道发射的一个或多个光信号产生。 该方法可以包括基于信道间非线性干扰的估计来确定一个或多个线性滤波器。 该方法可以包括使用一个或多个线性滤波器对光信号进行预失真以在第二光学信道上进行传输。 预失真的光信号可以被配置为减少对第一光信道的第一光信号的信道间非线性干扰。 该方法可以包括通过光传输介质在第二光信道上发送预失真的光信号。
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公开(公告)号：US10270537B2
公开(公告)日：2019-04-23
申请号：US15707476
申请日：2017-09-18
IPC分类号： H04B10/2507 , H04B10/2563 , H04B10/2557 , H04B10/58 , H04B10/564 , H04J14/02
摘要： A method for preventing nonlinear interference in an optical communication system. The method may include selecting an optical signal of a first optical channel. The method may include determining an estimate of inter-channel nonlinear interference to the optical signal of the first optical channel. The inter-channel nonlinear interference may be generated by one or more optical signals transmitted over a second optical channel in the optical communication system. The method may include determining one or more linear filters based on the estimate of the inter-channel nonlinear interference. The method may include pre-distorting an optical signal for transmission over the second optical channel using the one or more linear filters. The pre-distorted optical signal may be configured for reducing the inter-channel nonlinear interference to the first optical signal of the first optical channel. The method may include transmitting the pre-distorted optical signal over the second optical channel through an optical transmission medium.
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公开(公告)号：US20180083712A1
公开(公告)日：2018-03-22
申请号：US15707476
申请日：2017-09-18
IPC分类号： H04B10/58 , H04J14/02 , H04B10/564 , H04B10/2507 , H04B10/2563 , H04B10/2557
CPC分类号： H04B10/58 , H04B10/2557 , H04B10/2563 , H04B10/2572 , H04B10/564 , H04B2210/254 , H04J14/0221
摘要： A method for preventing nonlinear interference in an optical communication system. The method may include selecting an optical signal of a first optical channel. The method may include determining an estimate of inter-channel nonlinear interference to the optical signal of the first optical channel. The inter-channel nonlinear interference may be generated by one or more optical signals transmitted over a second optical channel in the optical communication system. The method may include determining one or more linear filters based on the estimate of the inter-channel nonlinear interference. The method may include pre-distorting an optical signal for transmission over the second optical channel using the one or more linear filters. The pre-distorted optical signal may be configured for reducing the inter-channel nonlinear interference to the first optical signal of the first optical channel. The method may include transmitting the pre-distorted optical signal over the second optical channel through an optical transmission medium.
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公开(公告)号：US11277206B1
公开(公告)日：2022-03-15
申请号：US17018495
申请日：2020-09-11
IPC分类号： H04B10/00 , H04B10/61 , H04B10/516 , H04L27/36 , H04L27/34 , H04B10/532
摘要： A transmitter maps an N-bit sequence to a point selected from a four-dimensional (4D) constellation consisting of 2N points which form a subset of a Cartesian product of first and second two-dimensional (2D) constellations, the first constellation consisting of M1 points divided into first, second, and third points, and the second constellation consisting of M2 points divided into fourth, fifth, and sixth points, wherein M1, M2≥5, and wherein log2(M1×M2)>N. The subset includes any 4D point that is generated by combining any one of the M1 points and any one of the fourth points; includes any 4D point that is generated by combining any one of the first points and any one of M2 points; and excludes any 4D point that is generated by combining any third point and any sixth point. An optical signal representing the selected point is transmitted to a receiver.
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公开(公告)号：US11201695B2
公开(公告)日：2021-12-14
申请号：US17226287
申请日：2021-04-09
摘要： A method performed at an electronic device comprises receiving information bits, a first nub, and a second nub, each nub comprising redundant values; calculating first calculated determiners from first subsets of the information bits along a first dimension; calculating first corrected determiners by applying first FEC decoding to a combination of the first calculated determiners and the first nub; correcting at least one error in the information bits using a difference between the first corrected determiners and the first calculated determiners; calculating second calculated determiners from second subsets of the information bits along a second dimension that differs from the first dimension; calculating second corrected determiners by applying second FEC decoding to a combination of the second calculated determiners and the second nub; and correcting at least one additional error in the information bits using a difference between the second corrected determiners and the second calculated determiners.
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公开(公告)号：US11126219B2
公开(公告)日：2021-09-21
申请号：US16599678
申请日：2019-10-11
摘要： A receiver apparatus comprises circuitry configured for storing a first sequence of values. At the receiver apparatus, a communications signal is received which conveys a second sequence of values, the second sequence of values being related to the first sequence of values. According to some examples, the second sequence of values is identical to the first sequence of values. At the receiver apparatus, P results are calculated from a cross-correlation of the first sequence of values with at least a portion of a representation of the communications signal, where P is a positive integer. According to some examples, P≥2. An estimate of a phase offset of a continuous clock is calculated as a function of the P results. According to some examples, the function is a non-linear function. The estimate of the clock phase offset may be used to achieve clock recovery at the receiver apparatus.
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公开(公告)号：US11038599B1
公开(公告)日：2021-06-15
申请号：US17064910
申请日：2020-10-07
IPC分类号： H04B10/00 , H04B10/61 , H04B17/391
摘要： A receiver applies first processing to a digital representation of a received signal to generate a first processed signal having first additive noise and first linear inter-symbol interference (ISI), the first processing comprising a substantially linear operation designed to substantially minimize a sum of variances of the first additive noise and the first linear ISI. The receiver applies second processing to the first processed signal to generate a second processed signal having second additive noise and second linear ISI, the second processing comprising a substantially nonlinear operation designed (i) to make a variance of the second additive noise substantially lower than the variance of the first additive noise, and (ii) to make a sum of the variance of the second additive noise and a variance of the second linear ISI substantially lower than the sum of the variances of the first additive noise and first linear ISI.
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公开(公告)号：US09088387B2
公开(公告)日：2015-07-21
申请号：US13949627
申请日：2013-07-24
CPC分类号： H04L1/00 , H03M13/1515 , H03M13/251 , H03M13/6325
摘要： A method of recovering a value of a symbol received through an optical communications system. A multi-bit estimate of the symbol is subdivided into a first part and a second part, each part including at least one respective bit of the estimate. A most likely value of the first part is detected. The most likely value of the first part is processed using a Forward Error Correction (FEC) decoder to generate a corrected first part value, which is used to detect a most likely value of the second part. The most likely value of the second part is then processed by the FEC decoder to generate a corrected second part, which is combined with the corrected first part to recover the value of the symbol.
摘要翻译： 一种恢复通过光通信系统接收的符号的值的方法。 符号的多位估计被细分为第一部分和第二部分，每个部分包括估计的至少一个相应位。 检测到第一部分的最有可能的值。 使用前向纠错（FEC）解码器处理第一部分的最可能的值，以产生校正的第一部分值，其用于检测第二部分的最可能的值。 然后由FEC解码器处理第二部分的最可能的值，以产生校正的第二部分，其与校正的第一部分组合以恢复符号的值。
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公开(公告)号：US10484131B2
公开(公告)日：2019-11-19
申请号：US15841988
申请日：2017-12-14
摘要： Client data bits, including first client data bits and second client data bits, are communicated from a transmitter to a receiver. At the transmitter, the first client data bits are processed to generate processed values, where each processed value is more likely to be a first element than a second element. Forward Error Correction ‘FEC’ encoding is applied to the second client data bits to generate FEC-encoded values. Symbols are created by mapping the FEC-encoded values to first positions in the symbols and by mapping the processed values to second positions in the symbols. The symbols are modulated onto a communications channel using a modulation scheme with a code that assigns a lower average energy to symbols containing the first elements in the second positions than to symbols containing the second elements in the second positions. At the receiver, client data bits are decoded using conditional chain decoding.
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公开(公告)号：US10374623B1
公开(公告)日：2019-08-06
申请号：US16004673
申请日：2018-06-11
IPC分类号： H04B10/532 , H03M1/08 , H04Q11/00
摘要： A controlled switch having N inputs and a single output (N≥2) is switchable between N states. In each state a respective one of the inputs is connected to the single output. There are N sources of sub-streams of analog samples, each sub-stream composed of pairs of adjacent analog samples. Each source is coupled to a respective one of the inputs. In operation, the controlled switch is controlled by a control signal to switch between the N states. While the controlled switch is in any one of the states, a data transition occurs between two adjacent analog samples in the sub-stream whose source is coupled to the input that is connected to the single output. The single output yields the high-bandwidth analog signal. Any pair of adjacent analog samples in any one of the sub-streams substantially determines a corresponding pair of adjacent analog samples in the high-bandwidth analog signal.
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