Light transmission device capable of stably transmitting a modul

Details Light transmission device capable of stably transmitting a modul Light transmission device capable of stably transmitting a modul

1993-01-19

1995-07-11

Boudreau, Leo H.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359181, 359187, 372 28, 372 29, H04J 1402, H04B 1004

Patent

active

054326290

ABSTRACT:
In a light transmission device operable in response to a sequence of input digital signals to produce an output light beam, a modulated light beam is produced from a laser device as a result of frequency shift keying carried out under a designed modulation index and is transmitted as the output light beam on one hand and is sent to a Fabry-Perot interferometer on the other hand to produce an optical output beam which has an output level deviated in dependence upon a variation of a modulation index relative to the designed modulation index. A feedback signal is fed back to a drive circuit which is supplied with the input signals and which is operable to control the laser device. The feedback signal serves to adjust the modulation index of the laser device to the designed modulation index. A controller may be included to control a central frequency of the output light beam by producing a bias signal which is added to the feedback signal.

REFERENCES:
patent: 4700352 (1987-10-01), Shikada et al.
patent: 5027435 (1991-06-01), Chraplyvy et al.
patent: 5107512 (1992-04-01), Shibutani
patent: 5170274 (1992-12-01), Kuwata et al.
patent: 5228043 (1993-07-01), Naito et al.
patent: 5247382 (1993-09-01), Suzuki

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