Effect of Reflected Light on Mode Partition Characteristics of Fabry-Perot Laser Diodes

Akiyuki TAKEDA  Takeshi KAWAI  Masakazu MORI  Toshio GOTO  Akira MIYAUCHI  

IEICE TRANSACTIONS on Communications   Vol.E75-B    No.3    pp.217-225
Publication Date: 1992/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
optical communication,  opto-electronics,  semiconductor lasers,  

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The effect of the externally reflected light on the mode partition characteristics of 1.3 µm Fabry-Perot laser diodes is studied experimentally and numerically. It is observed that the k-value increases monotonically with the DC bias current and the external reflection coefficient. Based on these experimental results, a numerical model to study the mode partition characteristics of laser diodes in the presence of external reflections is developed. The results calculated using this model agree well with the experimental ones. It is found that the mode partition noise is mainly caused by the interference between the light in the laser diode and the reflected light, and also by the fluctuations of the induced emission and absorption. In the time domain, their contribution to the mode partition noise is almost localized in the time region within 0.1nsec at the time when the optical pulse turns on.