Numerical Analysis of Suppression Effects on Optical Feedback Noise by Superposition of High Frequency Current in Semiconductor Lasers

Semiconductor lasers tend to suffer from the optical feedback (OFB) noise caused by the reflection of the output light at the surface of the optical disc or the optical fiber. Superposition of high frequency (HF) current is used as a technique to suppress the OFB noise. However, this is not effectiv...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2013-02, Vol.49 (2), p.196-204
Main Authors: Imran, S. M. S., Yamada, M.
Format: Article
Language:English
Subjects:
Approximation
Computer simulation
Frequency modulation
High frequencies
High frequency current
intensity noise
Laser feedback
Lasers
Mathematical analysis
Mathematical models
mode hopping
modulation
Noise
Optical feedback
optical feedback noise
semiconductor laser
Semiconductor lasers
Studies
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Summary:Semiconductor lasers tend to suffer from the optical feedback (OFB) noise caused by the reflection of the output light at the surface of the optical disc or the optical fiber. Superposition of high frequency (HF) current is used as a technique to suppress the OFB noise. However, this is not effective when the frequency of the HF current coincides with a rational number of the round trip time for the OFB. This paper shows numerical simulations on the phenomena of the OFB noise, its suppression by the superposition of HF current and conditions at which the HF current is unable to suppress the noise. The model used here is based on multimode rate equations that include nonlinear gain, Langevin noise sources, the OFB, and the HF superposition. Generating mechanism of the OFB noise and its suppression are explained with approximated but analytical equations. Excellent correspondence between experimental data and simulation is also demonstrated.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2012.2236078