METHOD AND DEVICE FOR REGULATING THE LIGHT POWER OF LASER DIODES

摘要

PCT No. PCT/FR84/00056 Sec. 371 Date Nov. 9, 1984 Sec. 102(e) Date Nov. 9, 1984 PCT Filed Mar. 9, 1984 PCT Pub. No. WO84/03592 PCT Pub. Date Sep. 13, 1984.The device adapted to regulate the light power emitted by a laser diode (2) associated to an electric supply circuit (32) comprises a photosensor (6) providing an electric signal representing the mean optical power of the laser diode. A circuit (8) associated to the photodetector provides an error signal representing the deviation between the actual light power and an order power. The error signal is applied to a circuit (10) which controls a Peltier element (22) for cooling the laser. The supply circuit (32) either uses constant current or is controlled by a safety branch (30) which is operated in case of a sudden temperature variation of failure of the main servo control. The device may be particularly used in telecommunications.