LASER MODULE

摘要

A laser module includes a light source device having a first amplifier that outputs first output light, and a second amplifier that outputs second output light, a first drive circuit that supplies the first amplifier with a first drive current, a second drive circuit that supplies the second amplifier with a second drive current. A dither signal is superimposed on one of two drive currents to respectively grasp the characteristics of the two amplifiers.

主权项

1. A laser module comprising:
a light source device having a first amplifier that outputs first output light, and a second amplifier that outputs second output light; a first drive circuit that supplies the first amplifier with a first drive current on which a dither signal is superimposed; a first monitoring circuit that detects the current supplied to the first amplifier; a second drive circuit that supplies the second amplifier with a second drive current; a second monitoring circuit that detects the second drive current; a light receiving element that receives part of the first output light and the second output light; an optical output monitoring circuit that detects the intensity of the light received by the light receiving element; and a processing circuit that controls the first drive circuit and the second drive circuit, wherein the processing circuit obtains a correlation between the first drive current and the intensity of the first output light from the output from the first monitoring circuit and the output from the optical output monitoring circuit, computes from the correlation the first drive current by which the average of the first output light is made equal to a predetermined value, causes the computed first drive current to be supplied to the first drive circuit, and causes the second drive current to be supplied to the second drive circuit so that the average of the output from the optical output monitoring circuit is constant.