Title :
Transmission performance impairment due to degradation of optical spectrum in 1.55 ¿m DFB laser
Author :
Yamamoto, Seiichi ; Sakaguchi, H. ; Iwamoto, Yukihide
Author_Institution :
KDD Research & Development Laboratories, Tokyo, Japan
Abstract :
The dynamic optical spectrum and optical transmission characteristics of a 1.55 ¿m conventional distributed feedback (DFB) laser with a side mode were analysed. The laser used in the experiment came to operate in two modes although initially it had operated in single-mode. When this laser was directly modulated by setting the bias current around the threshold, the mode switching between a main mode and a side mode was observed to be similar to mode partitioning in Fabry-Perot (FP) lasers. The mode switching affects considerably the bit error rate performance of 113 km single-mode fibre transmission at 140 Mbit/s.
Keywords :
III-V semiconductors; distributed feedback lasers; gallium arsenide; gallium compounds; indium compounds; laser modes; light transmission; optical communication equipment; optical modulation; semiconductor junction lasers; DFB laser; InGaAsP-InP laser; bias current; bit error rate performance; dynamic optical spectrum; laser modulation; mode switching; optical transmission characteristics; semiconductor laser; side mode; single-mode fibre transmission;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19860274
