Vorrichtung und Verfahren zur Nachweisung vom Umspringen der Wellenart in einem Halbleiterlaser.

摘要

An arrangement for discriminating whether a semiconductor laser (13, LD) employed in a light transmission system is functional or not includes: a circuit (11) for generating a pulse pattern (P1, Pn) repeatedly with unit of a plurality of bits and feeding to the semiconductor laser; a medium (3) for passing a light pulse signal output from the semiconductor laser; and a receiving equipment (2) including a circuit (21, APD) for regenerating the pulse pattern from the light pulse signal and outputting a regenerative pulse pattern (P2) and a discriminating circuit (26) responding to the regenerative pulse pattern. The discriminating circuit discriminates whether or not a pseudo-pulse exceeding a predetermined threshold level (Vth) 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 indicted result, a discrimination of whether the laser is functional or not can be carried out with simplicity and high reliability and without troublesome labor, under a condition that the laser is kept incorporated into the light transmission system.