TITLE

Linewidth broadening due to longitudinal spatial hole burning in a long distributed feedback laser

AUTHOR(S)
Wu, Ming-Chiang; Lo, Yu-hwa; Wang, Shyh
PUB. DATE
April 1988
SOURCE
Applied Physics Letters;4/4/1988, Vol. 52 Issue 14, p1119
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The spectral linewidth of a long distributed feedback (DFB) laser above threshold at high output power is investigated theoretically. Longitudinal spatial hole burning (LSHB) is shown to have important effects on the lasing characteristics and the broadening of linewidth. A four-wave coupled mode equation is developed to describe the LSHB phenomenon. The threshold gain and the carrier distribution are solved self-consistently above threshold at various output powers. The simulation results show that the power-linewidth product can increase by a factor greater than 2 due to LSHB for long DFB lasers. This theory has important implications on the limits of linewidth reduction by increasing the length of DFB lasers and on possible future device design for coherent optical system.
ACCESSION #
9826392

 

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