Optical tuning method and apparatus suitable for selective recep

Details Optical tuning method and apparatus suitable for selective recep Optical tuning method and apparatus suitable for selective recep

1990-07-25

1992-09-01

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359189, H04J 1402, H04B 1006

Patent

active

051444674

ABSTRACT:
An optical tuning device including a channel designator and an intermediate frequency stabilizer for stabilizing the frequency of a difference signal corresponding to the frequency difference between a transmitted optical signal and a local oscillation optical signal. The channel designator includes a bias control circuit for continuously changing the optical frequency of a local oscillation light source up to a frequency corresponding to a target channel, a channel detection circuit for detecting channel passage on the basis of the difference signal, and a channel counting circuit for storing therein the selected channel and the target channel, detecting the direction of the target channel, counting the number of channel passage times, and detecting arrival at the target channel.

REFERENCES:
patent: 4748683 (1988-05-01), Sato
patent: 4912527 (1990-03-01), Yamazaki

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