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31. 发明授权

US10171177B2 Digital signal processor, digital optical receiver using the same, and digital signal processing method 有权
公开(公告)号：US10171177B2
公开(公告)日：2019-01-01
申请号：US15534120
申请日：2015-12-15
申请人： NEC Corporation
发明人： Wakako Yasuda , Hidemi Noguchi
IPC分类号： H04B10/03 , H04B10/69 , H04B10/2507 , H04B10/61 , H04J11/00 , H04L25/03
摘要： It is difficult to obtain a demodulated signal with high signal quality in a digital optical receiver because it is difficult to compensate for each of different types of waveform distortion by a high-performance equalization process; therefore, a digital signal processor according to an exemplary aspect of the present invention includes a fixed equalization means for performing a distortion compensation process based on a fixed equalization coefficient on an input digital signal; an adaptive equalization means for performing an adaptive distortion compensation process based on an adaptive equalization coefficient on an equalized digital signal output by the fixed equalization means; a low-speed signal generation means for generating a low-speed digital signal by intermittently extracting one of the input digital signal and the equalized digital signal; a low-speed equalization coefficient calculation means for calculating a low-speed equalization coefficient to be used for a distortion compensation process of the low-speed digital signal; and a fixed equalization coefficient calculation means for calculating the fixed equalization coefficient by using at least a predetermined coefficient out of the low-speed equalization coefficient and the predetermined coefficient.

32. 发明申请

US20150280831A1 OPTICAL TRANSMISSION SYSTEM, OPTICAL PHASE MODULATOR, AND OPTICAL MODULATION METHOD 有权
标题翻译：光传输系统，光相位调制器和光调制方法
公开(公告)号：US20150280831A1
公开(公告)日：2015-10-01
申请号：US14433713
申请日：2013-07-31
申请人： NEC CORPORATION
发明人： Hidemi Noguchi
IPC分类号： H04B10/548
CPC分类号： H04B10/548 , G02F1/0121 , H04B10/5051 , H04B10/508 , H04B10/516 , H04B10/5561
摘要： The optical transmission system incudes signal output means (11S) for outputting a drive signal according to an input signal to the first optical modulator (11a), first waveform shaping signal output means (12S) for outputting a first waveform shaping signal to the second optical modulator (10A), and second waveform shaping signal output means (13S) for outputting a second waveform shaping signal to the third optical modulator (13a). The first waveform shaping signal is output to the second optical modulator (10A) at a timing relatively later than a timing of an output of a signal by the first optical modulator (11a). The second waveform shaping signal is output to the third optical modulator (13a) at a timing relatively earlier than the timing of the output of the signal by the first optical modulator (11a).
摘要翻译：光传输系统包括用于根据到第一光调制器（11a）的输入信号输出驱动信号的信号输出装置（11S），第一波形整形信号输出装置（12S），用于将第一波形整形信号输出到第二光调制器（10A）和用于向第三光调制器（13a）输出第二波形整形信号的第二波形整形信号输出装置（13S）。第一波形整形信号在比由第一光调制器（11a）输出信号的定时更晚的定时输出到第二光调制器（10A）。第二波形整形信号在比由第一光调制器（11a）输出信号的定时更早的时间被输出到第三光调制器（13a）。

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