Title :
A phase-modulated feedback method for testing optical isolators assembled into the laser diode package
Author :
Donati, Silvano ; Sorel, Marc
Author_Institution :
Dipartimento di Elettronica, Pavia Univ., Italy
fDate :
3/1/1996 12:00:00 AM
Abstract :
We present an easy-to-implement method for measuring the isolation factor of an optical isolator mounted in front of its laser diode chip. The method is based on phase-modulated feedback that is induced by a moveable mirror reflecting the emitted power back into the laser, and it consists of measuring the intensity modulation of power that is found to be well correlated to the round-trip attenuation, measurement sensitivities up to -80 dB in terms of isolation have been obtained. The method has been tested successfully for several kinds of laser diodes, either FP or DFB with emission in first and third windows.
Keywords :
intensity measurement; laser feedback; mirrors; optical isolators; optical modulation; optical testing; phase modulation; semiconductor lasers; sensitivity; easy-to-implement method; emitted power; intensity modulation measurement; isolation factor; laser diode chip; laser diode package; laser diodes; measurement sensitivities; moveable mirror reflection; optical isolator testing; phase-modulated feedback; phase-modulated feedback method; round-trip attenuation; Assembly; Diode lasers; Isolators; Laser feedback; Optical attenuators; Optical feedback; Packaging; Semiconductor device measurement; Stimulated emission; Testing;
Journal_Title :
Photonics Technology Letters, IEEE
