公开(公告)号：US07474860B2

公开(公告)日：2009-01-06

申请号：US11306174

申请日：2005-12-19

申请人： Rene Jean Essiambre ,  Michael Rubsamen ,  Peter J. Winzer

发明人： Rene Jean Essiambre ,  Michael Rubsamen ,  Peter J. Winzer

IPC分类号： H04B10/06

CPC分类号： H04L25/03178 ,  H04B10/66

摘要： In an over-sampled maximum-likelihood sequence estimation (MLSE) receiver system, the optimal sample spacing is determined for a variety of conditions. In an illustrative implementation, the system includes an optical filter for tightly filtering an incoming optical data signal with an on-off-keying (OOK) non-return-to-zero (NRZ) format, followed by an optical-to-electrical converter, an electrical filter, a sampler, and a MLSE receiver. The sampler samples the filtered electrical data signal twice each bit period with unequal sample spacings. For wide optical filtering bandwidths, the optimal sample spacing occurs at less than 50% of a bit period. For narrow bandwidths, the optimal sample instances occur closer to the maximum eye opening.

摘要翻译： 在过采样的最大似然序列估计（MLSE）接收机系统中，针对各种条件确定最佳采样间隔。 在说明性实施方案中，该系统包括用于使用开关键（OOK）不归零（NRZ）格式紧密地滤波输入的光数据信号的光学滤波器，随后是光 - 电转换器 ，电气滤波器，采样器和MLSE接收器。 采样器以不相等的样本间隔对滤波后的电数据信号采样两次，每个位周期。 对于宽光学滤波带宽，最佳采样间隔发生在小于位周期的50％。 对于窄带宽，最佳采样实例更接近最大眼睛开度。

公开(公告)号：US20080199191A1

公开(公告)日：2008-08-21

申请号：US11306177

申请日：2005-12-19

申请人： Rene-Jean Essiambre ,  Michael Rubsamen ,  Peter Winzer

发明人： Rene-Jean Essiambre ,  Michael Rubsamen ,  Peter Winzer

IPC分类号： H04B10/06 ,  H04L27/06

CPC分类号： H04L25/03057 ,  H04B10/697 ,  H04L2025/03503 ,  H04L2025/03605

摘要： Severe inter-symbol interference (ISI), introduced by narrow-band optical filtering in high spectral efficiency wavelength-division multiplexed (WDM) systems to avoid coherent WDM crosstalk, can be substantially mitigated by the use of maximum-likelihood sequence estimation (MLSE) reception. Compared to conventional threshold detection, the use of an MLSE receiver allows, for example, a 22% reduction in optical receive filter bandwidth. For tight optical filtering, the MLSE receiver benefits from taking into account noise correlation. MLSE receivers with one and with two samples per bit are described and it is shown that while oversampling is beneficial for wide-band optical filters, the benefit goes away for narrow-band optical filtering, thereby facilitating MLSE design for rates beyond 10 Gb/s.

摘要翻译： 通过使用最大似然序列估计（MLSE）可以大大减轻在高光谱效率波分复用（WDM）系统中通过窄带光滤波引入的严重符号间干扰（ISI），以避免相干WDM串扰， 接待处 与常规阈值检测相比，使用MLSE接收器允许例如光接收滤波器带宽减少22％。 对于紧密的光学滤波，MLSE接收机可以从考虑噪声相关性中受益。 描述了每位具有一个和两个采样的MLSE接收器，并且示出了虽然过采样对于宽带光滤波器是有益的，但是对于窄带光学滤波，益处将消失，从而有助于MLSE设计的速率超过10Gb / s 。

公开(公告)号：US20070140706A1

公开(公告)日：2007-06-21

申请号：US11306174

申请日：2005-12-19

申请人： Rene Essiambre ,  Michael Rubsamen ,  Peter Winzer

发明人： Rene Essiambre ,  Michael Rubsamen ,  Peter Winzer

IPC分类号： H04B10/06

CPC分类号： H04L25/03178 ,  H04B10/66

摘要： In an over-sampled maximum-likelihood sequence estimation (MLSE) receiver system, the optimal sample spacing is determined for a variety of conditions. In an illustrative implementation, the system includes an optical filter for tightly filtering an incoming optical data signal with an on-off-keying (OOK) non-return-to-zero (NRZ) format, followed by an optical-to-electrical converter, an electrical filter, a sampler, and a MLSE receiver. The sampler samples the filtered electrical data signal twice each bit period with unequal sample spacings. For wide optical filtering bandwidths, the optimal sample spacing occurs at less than 50% of a bit period. For narrow bandwidths, the optimal sample instances occur closer to the maximum eye opening.

摘要翻译： 在过采样的最大似然序列估计（MLSE）接收机系统中，针对各种条件确定最佳采样间隔。 在说明性实施方案中，该系统包括用于使用开关键（OOK）不归零（NRZ）格式紧密地滤波输入光数据信号的光学滤波器，随后是光电转换器 ，电气滤波器，采样器和MLSE接收器。 采样器以不相等的样本间隔对滤波后的电数据信号采样两次，每个位周期。 对于宽光学滤波带宽，最佳采样间隔发生在小于位周期的50％。 对于窄带宽，最佳采样实例更接近最大眼睛开度。