Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-05-01
1992-01-14
Kuntz, Curtis
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359182, H04B 1000
Patent
active
050817108
ABSTRACT:
An optical transmitter includes at least one single-mode type laser diode for producing laser emission, and an external cavity with a partial reflector for reflecting a portion of the emission back into the laser. A DC current operates the laser in a first mode with a first frequency of emission. The laser is pulsed with a predetermined sequence of signal pulses each shifting the laser to a second mode with a second frequency different than the first frequency. The frequency shifting thereby constitutes information in a laser beam corresponding to the sequence of signal pulses. The laser system may be formed of a plurality of laser diodes in an array, so that the reflector reflects emission back into the diodes to lock them in the alternate modes of operation.
REFERENCES:
patent: 3705992 (1972-12-01), Ippen et al.
patent: 4561119 (1985-12-01), Epworth
patent: 4627106 (1986-12-01), Drake
patent: 4748687 (1988-05-01), Auracher et al.
patent: 4805235 (1989-02-01), Henmi
"Mode Control of an Array of AlGaAs Lasers Using a Spatial Filter in a Talbot Cavity", by F. X. D'Amato, E. T. Siebert and C. Roychoudhuri, SPIE Proc. 1043, p. 100 (1989).
D'Amato Francis X.
de Groot Peter J.
Lee Kotik
Denson-Low Wanda K.
Hays Robert A.
Hughes Danbury Optical Systems, Inc.
Kuntz Curtis
Negash Kinfe-Michael
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