发明名称 |
Analog-to-digital conversion controller, optical receiving device, optical receiving method, and waveform-distortion compensating device |
摘要 |
<p>An optical receiving device of the present invention receives optical signals from an optical transmitting device which uses a modulation format wherein an optical intensity waveform of each symbol is return-to-zero (RZ) pulse, and converts the received optical signals into digital signals by a conversion process of an analog to digital (AD) converter. A control-value calculating unit subsequent to the AD converter digitally processes the digital signals, retrieves an absolute value of the digital signals or a value corresponding one-to-one with the absolute value of the digital signals, estimates errors from an appropriate timing of a sampling timing in the AD converter based on the absolute value of the digital signals or the value corresponding one-to-one with the absolute value of the digital signals, and calculates a control value controlling the sampling timing based on the estimated errors. Based on the control value, a phase of a pulse regulating the sampling timing of AD conversion can be compensated.</p> |
申请公布号 |
EP2034637(B1) |
申请公布日期 |
2011.03.09 |
申请号 |
EP20080020531 |
申请日期 |
2008.01.02 |
申请人 |
FUJITSU LIMITED |
发明人 |
TANIMURA, TAKAHITO;NAKASHIMA, HISAO;HOSHIDA, TAKESHI |
分类号 |
H03M1/12;H04B10/2507;H04B10/54;H04B10/556;H04B10/58 |
主分类号 |
H03M1/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|