Title :
Design for single-mode asymmetric quarter-wavelength-shifted DFB laser with high differential efficiency
Author :
Soda, H. ; Ishikawa, Hiroshi ; Imai, H.
Author_Institution :
Fujitsu Laboratories Ltd., Atsugi, Japan
Abstract :
An asymmetric quarter-wavelength-shifted DFB laser which has high differential efficiency and a large threshold gain difference under high-power operation has been designed taking the spatial hole-burning effect into account. The optimum kL was found to be about 1.4 in the laser, which has an asymmetry S/L of 0.15, where S is the distance from the centre to the phase shift position and L is the laser length.
Keywords :
distributed feedback lasers; semiconductor junction lasers; asymmetric quarter-wavelength-shifted DFB laser; design; differential efficiency; high-power operation; single-mode; spatial hole-burning effect; threshold gain difference;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19870429
