Article

Chirp and linewidth enhancement factor alpha of current modulated Ga(Al)As-GRINSCH-SQW-MCRW flared waveguide lasers

Lehrstuhl fur Allgemeine Elektrotechnik, Angewandte Electron. Tech. Univ., Munchen, West Germany
Electronics Letters (impact factor: 0.96). 10/1990; DOI:10.1049/el:19901024
Source: IEEE Xplore

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 .

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Keywords

FM-to-AM phase
 
frequency deviation
 
lasers exhibited
 
linewidth enhancement
 
low modulation frequencies
 
phase-sensitive Michelson interferometer
 
waveguide lasers
 

M. Heinrich