Method for controlling a tunable filter and an apparatus therefo

Details Method for controlling a tunable filter and an apparatus therefo Method for controlling a tunable filter and an apparatus therefo

1993-04-27

1994-02-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

372 29, G01J 132

Patent

active

052850595

ABSTRACT:
An apparatus for controlling a tunable filter of the present invention includes a tunable filter, a generating device for generating a reference light whose wavelength is within a transmission wavelength band of the tunable filter, a detecting device for detecting an interaction signal, such as a beat signal, caused by interaction between a desired component of an input light to be input into the tunable filter and the reference light and a controlling device for controlling the tunable filter based on the interaction signal. The controlling device controls a current flow through a wavelength control terminal of the tunable filter such that a center filtering wavelength of the transmission wavelength band of the tunable filter substantially coincides with a wavelength of the desired component.

REFERENCES:
patent: 4841519 (1989-06-01), Nishio
patent: 4947398 (1990-08-01), Yasuda et al.
"Method of setting tunable optical filters in a wavelength division multi-access system"; IBM Technical Disclosure Bulletin; vol. 31, No. 11; Apr. 1989, New York US.; pp. 271-274.
"A photonic wavelength division switching system using tunable lasser diode filters"; by: S. Suzuki et al. IEEE International Conference on Communications. Conference Record; vol. 2; Jun. 11, 1989, New York, US.; pp. 722-727.
"1.5 mum optical filter using a two-section Fabry-Perot lasser diode with wide tuning range and high constant gain"; by T. Numai; IEEE Photonics Technology Letters; vol. 2, No. 6 Jun. 1990, New York US.; pp. 402-403.

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