Acta Photonica Sinica, Volume. 45, Issue 10, 1014003(2016)
Chaotic Signal Generation with Low Time-delay Signature Based on a Semiconductor Laser Subject to Double Filtered Optical Feedback
Two Fabry-Perot interferometers were taken as double external cavities to construct a Double Filtered Optical Feedback Semiconductor Laser (DFOF-SL) for achieving chaotic signal with low time-delay signature, and the influences of feedback time, feedback strength, filter bandwidth, and the frequency detuning between the central frequency of the filter and the solitary laser on the time-delay signature evolution were theoretically investigated. The results show that, when the difference of the feedback time between the two external cavities approximately equals to a half of the relaxation oscillation period of the laser, the chaotic signal with relatively weak time-delay signature can be obtained. Moreover, through suitably selecting feedback strength, filter bandwidth, and the frequency detuning between the central frequency of the filter and the solitary laser, the time-delay signature can be further suppressed. Finally, based on the map of time-delay signature evolution in the parameter space of filter bandwidth and frequency detuning, the optimal feedback parameter regions for achieving chaotic signal with low time-delay signature have been determined.
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LU Dong, ZHONG Zhu-qiang, XIA Guang-qiong, WU Zheng-mao. Chaotic Signal Generation with Low Time-delay Signature Based on a Semiconductor Laser Subject to Double Filtered Optical Feedback[J]. Acta Photonica Sinica, 2016, 45(10): 1014003
Received: Apr. 13, 2016
Accepted: --
Published Online: Nov. 14, 2016
The Author Email: Dong LU (506144925@qq.com)