Title :
Chirp and linewidth enhancement factor alpha of current modulated Ga(Al)As-GRINSCH-SQW-MCRW flared waveguide lasers
Author :
Heinrich, M. ; Claassen, M.
Author_Institution :
Lehrstuhl fur Allgemeine Elektrotechnik, Angewandte Electron. Tech. Univ., Munchen, West Germany
Abstract :
The frequency deviation (´chirp´) of two current modulated Ga(Al)As-GRINSCH-SQW-MCRW flared waveguide lasers was measured with a phase-sensitive Michelson interferometer. Their linewidth enhancement could be determined to be as low as alpha =+2.2 and alpha =+2.4 including the confirmation of the sign according to the definition used. At low modulation frequencies the lasers exhibited an excess chirp with a magnitude strongly decreasing with increased bias current and a FM-to-AM phase shifting from 180 degrees down to 0 degrees .
Keywords :
III-V semiconductors; aluminium compounds; gallium arsenide; gradient index optics; light interferometry; optical modulation; optical waveguides; semiconductor junction lasers; FM-to-AM phase shifting; GaAlAs flared waveguide laser; MOVPE; chirp; current modulated GRINSCH-SQW-MCRW laser; frequency deviation; linewidth enhancement factor; modulation frequencies; phase-sensitive Michelson interferometer; semiconductor quantum wells;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19901024
