Investigation on the spectral characteristics of DFB lasers with different grating configurations made by electron-beam lithography

• The single-mode stability for distributed-feedback (DFB) lasers with various electron-beam-written grating configurations has been investigated theoretically and experimentally, for both as-cleaved and AR-coated lasers. Other laser properties interesting for coherent and multichannel communications systems, such as linewidth and tunability, have also briefly been investigated. Lasers with more sophisticated grating structures, such as an optimized multiple phase-shifted or a corrugation-pitch-modulated grating, did not exhibit performance significantly superior to that of lambda;/4-shifted DFB lasers with an appropriate coupling coefficient. Antireflection (AR)-coating of the end facets proved indispensable for obtaining a high yield for lasers with single-mode operation at high output power and for reducing the large chip-to-chip variation seen for the as-cleaved lasers. A theoretical investigation of the effect of end reflections on the stopband and of the problem of determining the coupling coefficient was also made

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

lambda;/4-shifted;AR-coated lasers;DFB lasers;antireflection coatings;as-cleaved;chip-to-chip variation;coherent optical links;corrugation-pitch-modulated grating;coupling coefficient;distributed-feedback;electron-beam lithography;electron-beam-written grating configurations;end facets;end reflections;high output power;high yield;laser properties;linewidth;multichannel communications systems;optimized multiple phase-shifted;semiconductor laser diodes;single-mode operation;single-mode stability;spectral characteristics;stopband;tunability;antireflection coatings;diffraction gratings;distributed feedback lasers;electron beam lithography;laser modes;laser tuning;optical films;semiconductor lasers;spectral line breadth

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