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Extracting the external-cavity key of a chaotic semiconductor laser with double optical feedback by spectrum analyzer

Liang Jun-Sheng Wu Yuan Wang An-Bang Wang Yun-Cai

Extracting the external-cavity key of a chaotic semiconductor laser with double optical feedback by spectrum analyzer

Liang Jun-Sheng, Wu Yuan, Wang An-Bang, Wang Yun-Cai
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  • Received Date:  23 August 2010
  • Accepted Date:  15 April 2011
  • Published Online:  15 March 2012

Extracting the external-cavity key of a chaotic semiconductor laser with double optical feedback by spectrum analyzer

  • 1. Institute of Optoelectronic Engineering, Dept. of Physics & Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
Fund Project:  Project supported by the National Natural Science Foundation of China(Grant No. 60777041) , the Young Scientists Fund of the National NaturalScience Foundation of China(Grant No. 60908014 ), the Natural Science Foundation of Shanxi Province, China(Grant No. 2009021003), theKey Research Project of Science and Technology of Shanxi, China(Grant No. 20100321055-02), the Taiyuan Science and Technology StarsProject of China(Grant No. 09121007), and the Open Research Fund of State Key Laboratory of Transient Optics and Photonics, ChineseAcademy of Sciences, China(Grant No. SKLST 201015).

Abstract: Optical-feedback laser diodes have been widely applied in chaotic optical communication, because it can simply generate wideband and high-dimension chaos and its external-cavity length is often regarded as an additional key. In this paper, it is experimentally demonstrated that the time delay signature of a chaotic laser diode with optical feedback can be identificated. Through locally enlarging the power spectral of chaotic light and observing its fine structure, the external-cavity key can be directly extracted by the spectrum analyzer, regardless of the laser diode with single or dual optical feedback of different external cavity length ratio.

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