Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1986-03-20
1988-03-22
Wan, Gene
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455615, 455619, G02B 628
Patent
active
047324473
ABSTRACT:
A receiver for modulated optical signals including a multiport optical fibre coupler arrangement (10) to one input port of which the modulated optical signals are applied and to another input port of which a local oscillator optical signal of substantially the same optical frequency as the modulated optical signal is applied whereby the output ports of the coupler give separate output signals that are differentially related to the optical frequency phase difference between the modulated input signal and the local oscillator signal, means for individually demodulating (12a-12c) the output signals and means for summing the demodulated output signals.
REFERENCES:
patent: 3939341 (1976-02-01), Graves
patent: 3970838 (1976-07-01), Goodwin et al.
patent: 4044247 (1977-08-01), Brown, Jr.
patent: 4063084 (1977-12-01), Goodwin et al.
patent: 4652076 (1987-03-01), Unger
Davis Anthony W.
Wright Stephen
Lee James C.
STC PLC
Wan Gene
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