System for fine tuning of a wavelength produced by a laser diode

Abstract

A system for fine tuning a laser diode to selectively lock it at more than one optical wavelengths, wherein the laser diode is equipped with an optical wave-locker based on a pair of photo diodes. The system comprises a control unit controlling at least one reference circuit having adjustable resistance and associated with the photo diodes; the control unit is capable of selectively switching, to said photodiodes, the mentioned at least one reference circuit and adjusting the resistance thereof for selecting a particular wavelength to which the laser is to be locked. The system further comprises a comparing unit for processing electric signals produced by said photodiodes in combination with the reference circuit(s) if switched in, and a feedback circuit for adjusting the laser's radiation to said particular wavelength based on a difference between the electric signals.

Dependencies are inferred from the claim text.