Title: Method of and apparatus for stabilizing output light of a current modulation laser device whose output is changed by changing an anode current

• Summary
• Claims
• Description
• View all

Abstract: A method of stabilizing output light of a current modulation laser device whose output light is changed by changing an anode current is disclosed. The method comprises detecting a part of a laser output light and converting that part of the laser output light which is detected into an electric signal, comparing said electric signal with a modulating input signal to obtain an analog signal corresponding to a difference between said two signals, controlling a gain of said modulating input signal by means of said analog signal, and feeding back said gain controlled modulating input signal to an input terminal of a laser device. An apparatus for carrying out the method comprises a partial mirror for detecting a part of said laser output light, a photodiode for converting that part of said laser output light which is detected into said electric signal, a comparison circuit connected to both said photodiode and an input terminal for receiving a modulating input signal and for comparing said electric signal with said modulating input signal to obtain said analog signal corresponding to a difference between said two signals, and a gain control circuit connected between said input terminal and the output of said comparison circuit and for controlling a gain of said modulating input signal by means of said analog signal.


Do you think this is a good invention? Vote now: