FSK laser transmitting apparatus

Details FSK laser transmitting apparatus FSK laser transmitting apparatus

1985-12-04

1987-10-13

Davie, James W.

Coherent light generators

Particular beam control device

Tuning

372 26, 372 28, 455609, H01S 310, G02F 100

Patent

active

047003529

ABSTRACT:
In an FSK laser transmitting apparatus, a light source can change the output light frequency. A driver performs FSK of the light source with a plurality of values. A beam splitter splits the output light from the light source into two split beams. A delay circuit delays one of the two split beams with respect to the other. A beam coupler combines delayed and nondelayed beams as the two split beams from the beam splitter. A controller detects the beat frequency of combined light from the beam coupler and supplies a control signal to the driver so as to set the beat frequency to be a predetermined value.

REFERENCES:
patent: 4564946 (1986-01-01), Olsson et al.
patent: 4608697 (1986-08-01), Coldren
S/N and Error Rate Evaluation for an Optical FSK-Heterodyne Detection System Using Semiconductor Lasers (IEEE Journal of Quantum Electronics, vol. QE-19, No. 2, Feb. 1983).
Optical Heterodyne Detection of Directly Frequency Modulated Semiconductor Laser Signals (Electronics Letters Oct. 23, 1980, vol. 16, No. 22).
Optical FSK Signal Detection in a Heterodyne System Using Semiconductor Lasers (Electronics Letters, May 27, 1982, vol. 18, No. 11).

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