Tunable optical filter having beam splitter and movable film fil

Details Tunable optical filter having beam splitter and movable film fil Tunable optical filter having beam splitter and movable film fil

1996-01-29

1997-07-08

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359889, H01J 4014

Patent

active

056463995

ABSTRACT:
A tunable filter module which can automatically make the center wavelength in the passband coincident with the center wavelength of a signal light beam according to variations in wavelength of the signal light beam. The tunable filter module includes a beam splitting mechanism for splitting an incident signal light beam into a first beam undeviated, a second beam deflected to one side of the first beam; and a third beam deflected to another side of the first beam, and a multilayer film filter located so as to transmit the first, second, and third beams. A first photodetector is located so as to detect the second beam, and a second photodetector is located so as to detect the third beam. A comparator is connected to the first and second photodetectors to compare outputs from the first and second photodetectors and output a differential signal indicative of the difference between these outputs. A tilt angle of the multilayer film filter is changed according to the differential signal so that the center wavelength in the passband of the multilayer film filter comes into coincidence with the center wavelength of the signal light beam.

REFERENCES:
patent: 4508964 (1985-04-01), Gunning III et al.
patent: 4776669 (1988-10-01), Dammann et al.
patent: 5214494 (1993-05-01), Inaba et al.
patent: 5504608 (1996-04-01), Neeves et al.

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