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Proceedings Paper

Laser feedback interference in gain-coupled DFB lasers
Author(s): Ming Wang; Junping Zhou
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Paper Abstract

The laser feedback interference in gain-coupled DFB laser diodes (Distribute Feedback LD) is analyzed. The threshold gain and frequency variation in the DFB laser diode are theoretically deduced. Considering the experiment in practice, we analyze the laser feedback interference at the condition of multiple external cavities. Some parameters have influences on the feedback interference, e.g., the coupling coefficient, the linewidth enhancement factor of gain-coupled DFB laser, the reflection coefficient of external reflector. We discussed these different parameters value in numerical analysis, including the simulation at the condition of multiple external cavities. Compared with the effect of laser feedback interference on F-P and λ/4 phase-shifted DFB lasers, the gain-couple DFB lasers are more sensitive to optical feedback for a specific κL value (coupling coefficient and L cavity length). These results show that the gain-couple DFB lasers can be used as laser feedback sensors with a high accuracy.

Paper Details

Date Published: 30 December 2005
PDF: 10 pages
Proc. SPIE 6028, ICO20: Lasers and Laser Technologies, 60282H (30 December 2005); doi: 10.1117/12.667350
Show Author Affiliations
Ming Wang, Nanjing Normal Univ. (China)
Junping Zhou, Nanjing Normal Univ. (China)

Published in SPIE Proceedings Vol. 6028:
ICO20: Lasers and Laser Technologies
Y. C. Chen; Dianyuan Fan; Chunqing Gao; Shouhuan Zhou, Editor(s)

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