| 摘要 |
An arrangement for demodulation of differentially encoded binary optical FSK signals including a path unbalanced optical interferometer (28) to which the FSK signals are applied, a multiport coupler (22) to which the output of the interferometer is applied, a plurality of optoelectronic receivers (24) to each of which the output of a respective output port of the coupler is applied, means for multiplying (26) the output of each receiver with a 1-bit delayed version of the same output and means for summing (30) the multiplied outputs. <IMAGE>
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