Optical waveguides – With optical coupler – Plural
Patent
1995-04-10
1997-09-02
Lee, John D.
Optical waveguides
With optical coupler
Plural
359173, 359152, G02B 6293
Patent
active
056640358
ABSTRACT:
A bidirectional optically powered signal transmission apparatus includes a control station and a field station which are optically linked by an optical fiber. The control station sends a first light beam to a light receiver in the field station. The field station sends a second light beam to the control station. The first and second light beams are at different wavelengths so that simultaneous bidirectional transmission is enabled. The field station further converts a portion of the first light beam to electric power for powering the field station. The field station demodulates an AC component superimposed on the light it receives to produce an AC electric signal for control of the field station. Optical transmitting and receiving functions in the field station are preferably combined into an integrated opto-electric and electro-optic converter (O-E and E-O converter). The O-E and E-O converter is preferably an integrated circuit.
REFERENCES:
patent: 4325137 (1982-04-01), Yoshikazu
patent: 4596051 (1986-06-01), Feldman
patent: 4727535 (1988-02-01), Brandt
patent: 4973169 (1990-11-01), Slonecker
patent: 5068541 (1991-11-01), Kondo
Kaiho Naoki
Sano Yasukazu
Tsuji Nobuhiko
Fuji Electric & Co., Ltd.
Lee John D.
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