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Proceedings Paper

Conversion between optical ASK and optical FSK using nonlinear dynamics of semiconductor lasers
Author(s): Sheng-Kwang Hwang; Sze-Chun Chan; Shiuan-Li Lin; Cheng-Hao Chu; Yu-Han Hung
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Paper Abstract

When a semiconductor laser is subject to an incoming optical carrier, equivalently an external optical injection, it can enter nonlinear period-one dynamics through Hopf bifurcation due to the radical modification in field-carrier coupling of the injected laser which results from the dynamical competition between injection-imposed laser oscillation and injection-shifted cavity resonance. Equally-separated spectral components appear, of which intensity and frequency depend strongly on the injection level and frequency. This suggests that a dynamical amplitude or frequency variation of the incoming optical signal, such as amplitude-shift keying (ASK) or frequency-shift keying (FSK), respectively, would lead to corresponding dynamical variation in amplitude and frequency of each spectral component. Therefore, by properly selecting the optical frequency of the output optical carrier and by minimizing the residual ASK and FSK modulation, both ASK-to-FSK and FSK-to-ASK conversions can be achieved, where bit-error ratio down to 10-12 is achieved with a slight power penalty. Only a typical semiconductor laser is necessary as the key conversion unit. In addition, frequency shifts of the optical carrier can also be achieved, which allows a simultaneous frequency conversion of the optical carrier if required.

Paper Details

Date Published: 15 May 2012
PDF: 6 pages
Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 843210 (15 May 2012); doi: 10.1117/12.922878
Show Author Affiliations
Sheng-Kwang Hwang, National Cheng Kung Univ. (Taiwan)
Sze-Chun Chan, City Univ. of Hong Kong (Hong Kong, China)
Shiuan-Li Lin, National Cheng Kung Univ. (Taiwan)
Cheng-Hao Chu, National Cheng Kung Univ. (Taiwan)
Yu-Han Hung, National Cheng Kung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8432:
Semiconductor Lasers and Laser Dynamics V
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)

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