Evaluation of an automatic method to extract the grating coupling coefficient in different types of fabricated DFB lasers

• 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- mu;m multi-quantum-well (MQW) DFB lasers with both facets as-cleaved, and in 1.55- mu;m MQW DFB lasers with no, one, or two facets as-cleaved

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

Nyckelord

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;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

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)