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

Volume

8

Issue

3

fYear

1996

fDate

3/1/1996 12:00:00 AM

Firstpage

405

Lastpage

407

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.481132

Filename

481132