Wavelength multiplexed optical transducer with a swept wavelengt

Details Wavelength multiplexed optical transducer with a swept wavelengt Wavelength multiplexed optical transducer with a swept wavelengt

1989-07-25

1990-11-20

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023110, 250205, 356345, 356352, H01J 516, G01B 902

Patent

active

049720775

ABSTRACT:
An optical transducer system for use with an optical transducer of the kind which produces a wavelength multiplexed optical output signal comprises a broadband optical source, and a tunable filter in the form of a Fabry-Perot interferometer connected to receive a broadband optical signal from the source. The interferometer is repeatedly swept through its pass band by a control signal of triangular or sawtooth waveform, producing a swept wavelength optical output signal for application to the transducer. In one embodiment, the optical output signal from the transducer is compared with the output signal from the interferometer to decode it, while in another embodiment, a control loop maintains the output amplitude (intensity) of the broadband source substantially constant over the range of wavelengths used by the transducer, enabling a reference channel provided in the transducer to be used for decoding purposes.

REFERENCES:
patent: 4653855 (1987-03-01), Birnbach et al.
patent: 4755668 (1988-07-01), Davis
patent: 4799797 (1989-01-01), Huggins
patent: 4818064 (1989-04-01), Youngquist et al.
patent: 4848906 (1989-07-01), Layton
patent: 4861136 (1989-08-01), Stone et al.
patent: 4868381 (1989-09-01), Davis
patent: 4873989 (1989-10-01), Einzig

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