Optical transmitter comprising an optical frequency discriminato

Details Optical transmitter comprising an optical frequency discriminato Optical transmitter comprising an optical frequency discriminato

1987-02-17

1989-02-14

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455609, 455611, 455618, H04B 900

Patent

active

048052353

ABSTRACT:
Supplied with an optical signal from a directly modulated semiconductor laser (11) in an optical transmitter, an optical frequency discriminator (15) converts a frequency modulated component of the optical signal to an intensity modulated component and produces an output optical beam which consists essentially of the intensity modulated component. Preferably, a negative feedback circuit (32, 33) is supplied in effect with the output optical beam representative of mark and space codes and controls the semiconductor laser and/or the optical frequency discriminator to keep the extinction ratio of the output optical signal at an optimum value such that the optical frequency discriminator has a transmissivity of about 90.degree./o for a predetermined one of the mark and space codes and a substantially zero transmissivity for the other of the mark and space codes.

REFERENCES:
patent: 3435230 (1969-03-01), Courtney-Pratt
patent: 3699445 (1972-10-01), Kinsel
patent: 4561119 (1985-12-01), Epworth
"Optical Phase Modulation in an Injection Locked AlGaAs Semiconductor Laser", Elec. Letters, 3-4-82, vol. 18, #5, Kobayashi et al, pp. 210-211.
"Single Mode Operation of 500 Mbit/s Modulated AlGaAs Semiconductor Laser", Elec. Letters, 9-11-80, vol. 16, #19, Kobayashi et al, pp. 746-748.
"Application of Injection Locked Semiconductor Lasers for Optical Communications in the Wavelength Range 0.8 .mu.m to 1.6 .mu.m", Conference on Communications Equipment and System, 4-22-82, Maylon et al, pp. 285-290.
IOOC-ECOC '85, Venezia, Italy, Oct. 1-4, 1985, Technical Digest, vol. III, pp. 49-52.
OFC/OFS '85, San Diego, Calif., Feb. 13-14, 1985; Technical Digest, pp. 22-24.
IEEE Journal of Quantum Electronics, Apr. 1982, vol. QE-18, No. 4, pp. 582-595.

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