Title :
Evaluation of an automatic method to extract the grating coupling coefficient in different types of fabricated DFB lasers
Author :
Skagerlund, Jan ; Pusa, Fredrik ; Sahlén, Olof ; Gillner, Lars ; Schatz, Richard ; Granestrand, Per ; Lundqvist, Lennart ; Stoltz, Björn ; Terlecki, Jerzy ; Wahlin, Fredrik ; Mörner, Ann-Caroline ; Wallin, Johan ; Berg, Olof Ö
Author_Institution :
Fibre Opt. Res. Centre, Ericsson Components AB Kista, Sweden
fDate :
1/1/1998 12:00:00 AM
Abstract :
Distributed feedback (DFB) laser parameters such as grating coupling coefficient, effective indices, facet reflectances, and the phases of facet reflectances have been determined using a method based on least-square fitting of theoretical spectra to measured, subthreshold DFB laser emission spectra. The only inputs needed are geometrical parameters such as length, grating period, and internal grating phase shifts. A larger number of devices have been successfully characterized, and consistent results have been obtained in both 1.3-μm multi-quantum-well (MQW) DFB lasers with both facets as-cleaved, and in 1.55-μm MQW DFB lasers with no, one, or two facets as-cleaved
Keywords :
diffraction gratings; distributed feedback lasers; infrared spectra; laser transitions; laser variables measurement; least squares approximations; optical couplers; optical testing; parameter estimation; quantum well lasers; reflectivity; semiconductor device testing; spontaneous emission; 1.3 mum; 1.55 mum; MQW DFB lasers; as-cleaved; automatic method; distributed feedback laser parameters; effective indices; fabricated DFB lasers; facet reflectance phases; facet reflectances; geometrical parameters; grating coupling coefficient; grating period; internal grating phase shifts; least-square fitting; multi-quantum-well DFB lasers; subthreshold DFB laser emission spectra; theoretical spectra; Distributed feedback devices; Fiber lasers; Gratings; Laser feedback; Laser modes; Laser noise; Laser theory; Optical coupling; Optical device fabrication; Semiconductor lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
