| 摘要 |
The optical signal receiver of this invention is an optical signal receiver that receives and frequency-demodulates an optical signal, comprising: an optical branch device for splitting an input optical signal into two optical signals ( 13 ); an optical delay line for delaying one of the two branched optical signals ( 15 ); a first photoelectric conversion circuit ( 17 ) for converting the optical signal from the optical delay line into the first electrical signal ( 17 ); a second photoelectric conversion circuit ( 19 ) for converting the other optical signal of the two branched optical signals into a second electrical signal; the rectangular-wave forming circuit ( 21, 23, 25 ) for outputting a single rectangular-wave signal using the first electrical signal from the first photoelectric conversion circuit and the second electrical signal from the second photoelectric conversion circuit as inputs; and a smoothing circuit ( 12 ) for smoothing the rectangular-wave signal from the rectangular-wave forming circuit.
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