Characteristics of Mode Partition Noise of DFB LD's Induced by Externally Reflected Light

Takeshi KAWAI  Atsutaka KURIHARA  Masakazu MORI  Toshio GOTO  Akira MIYAUCHI  Takakiyo NAKAGAMI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E75-B   No.9   pp.906-913
Publication Date: 1992/09/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
Keyword: 
optical communication,  opto-electronics,  distributed feedback laser,  

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Summary: 
The mode partition noise of 1.3µm distributed feedback laser diodes (DFB LD's), which is induced by the externally reflected light, is studied experimentally and numerically. The mode partition noise is evaluated by the k-value. It is observed that the mode parition noise monotonically increases with the DC bias current when the reflected light affects DFB LD's and the DC bias current is above the threshold current. From the dependence of the k-value on the external power reflection coefficient, it is observed that the k-value dramatically increases when the external power reflection coefficient is above a value which differs from LD to LD. This is closely related to the fact that the tolerance to the externally reflected light depends on the threshold gain difference between the main mode and the dominant side mode.