Comparison of message filtering characteristics between closed-loop and open-loop feedback schemes

Yun-Cai Wang; Yan-Li Li; An-Bang Wang

doi:10.1117/12.757575

6 February 2008 Comparison of message filtering characteristics between closed-loop and open-loop feedback schemes

Yun-Cai Wang, Yan-Li Li, An-Bang Wang

Proceedings Volume 6824, Semiconductor Lasers and Applications III; 68241N (2008) https://doi.org/10.1117/12.757575
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

We numerically study the message filtering characteristics of semiconductor laser as a receiver in optical chaos communication. The transmitter is an external-cavity laser subjecting to optical feedback that operates in a chaotic regime. The receiver can operate at a chaotic regime either similar to the transmitter (closed-loop scheme) or without optical feedback (open-loop scheme). We study the effects of frequency detuning and parameters mismatch between transmitter and receiver on quality of the recovered signal in both open and closed loop schemes. We find that the closed-loop scheme has, in general, a higher quality of recovered signal compared with the open-loop. We also study the effects of message frequency on quality of the recovered signal in the two types of schemes. The results demonstrate that the filtering effect of semiconductor laser receiver is larger for low frequency message and decreases as the message frequency approaches the relaxation oscillation frequency of semiconductor laser. The SNR of the recovered signal of the open-loop scheme remains higher than that of the closed-loop scheme when the message frequency is in high frequency region.

Citation Download Citation

Yun-Cai Wang, Yan-Li Li, and An-Bang Wang "Comparison of message filtering characteristics between closed-loop and open-loop feedback schemes", Proc. SPIE 6824, Semiconductor Lasers and Applications III, 68241N (6 February 2008); https://doi.org/10.1117/12.757575

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