Arrangement for discriminating whether or not semiconductor lase

Details Arrangement for discriminating whether or not semiconductor lase Arrangement for discriminating whether or not semiconductor lase

1988-10-21

1991-02-05

Rosenberger, Richard A.

Optics: measuring and testing

Lamp beam direction or pattern

2502011, 372 32, G01J 100, H01S 313

Patent

active

049899490

ABSTRACT:
An arrangement for discriminating whether a semiconductor laser employed in a light transmission system is functional or non-functional includes a circuit for generating a pulse pattern repeatedly with a unit of a plurality of bits and outputting the pulse pattern to the semiconductor laser and a medium for passing a light pulse signal output from the semiconductor laser. Receiving equipment includes a circuit for regenerating the pulse pattern from the light pulse signal and outputting a regenerative pulse pattern, and a discriminating circuit responding to the regenerative pulse pattern.
The discriminating circuit discriminates whether or not a pseudo-pulse exceeding a predetermined threshold level appears at a specific position in the regenerative pulse pattern during a predetermined time interval, and indicates a result of the discrimination. Based on the indicated result, a discrimination of whether the laser is functional or not can be carried out with simplicity and high reliability and without troublesome labor, while the laser remains incorporated in the light transmission system.

REFERENCES:
patent: 3896398 (1975-07-01), Ueki
patent: 4713819 (1987-12-01), Yoshikawa
patent: 4719358 (1988-01-01), Matsumoto et al.

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