Helfgott & Karas, P.C.
Data decision circuit used in optical parallel receiving module, optical parallel receiving module, optical parallel transmission system and terminal structure of optical transmission fiber
 An optical parallel receiving module receives optical signals transmitted in parallel in a plurality of channels by using optical fibers. The optical parallel receiving module includes photo-electric conversion elements for converting received signals which are electric signals as received signals, limiter amplifiers for comparing the received signals and a threshold level, and data decision circuits for recognizing data at a timing in every period of received data using a reference clock. Each of the data decision circuits includes a data edge position detecting unit for detecting in which region of a plurality of regions a rising edge of the received data is and for outputting a detecting signal corresponding to a detected region, one period of the received data having a reference phase equal to a phase of the reference clock signal being divided into the plurality of regions; and a data acquisition unit to which a plurality of clocks having different phases and the detecting signal from the data edge position detecting unit are supplied, each of the plurality of clocks corresponding to one of the plurality of regions, for acquiring data at a timing of a clock corresponding to the region in which the rising edge of the received data is detected by the data edge position detecting unit. 
Fujitsu Limited
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Sadayuki Yoshimitsu Tetsuo Hiroyuki Takeo Tetsuya Tatsuro
Miyata Sakai Watanabe Furukawa Iwama Kiyonaga Kunikane