Synchronization of chaos in unidirectionally and bidirectionally coupled multiple time delay laser diodes with electro-optical feedback

2009 ◽  
Vol 282 (2) ◽  
pp. 310-316 ◽  
Author(s):  
E.M. Shahverdiev ◽  
K.A. Shore
Keyword(s):  
Time Delay ◽  
Optical Feedback ◽  
Laser Diodes ◽  
Multiple Time

Suppression of Optical Feedback in Laser Diodes Using Multilayered Broad-band Ultra-low Reflective Facets-coating

2020 ◽  
Vol 12 (2) ◽  
pp. 02030-1-02030-5
Author(s):  
Sanjay J. Patel ◽  
◽  
Akshay Jariwala ◽  
C. J. Panchal ◽  
Vipul Kheraj ◽  
...  
Keyword(s):  
Optical Feedback ◽  
Broad Band ◽  
Laser Diodes

scholarly journals Chaotic Time-Delay Signature Suppression and Entropy Growth Enhancement Using Frequency-Band Extractor

Entropy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. 516
Author(s):  
Yanqiang Guo ◽  
Tong Liu ◽  
Tong Zhao ◽  
Haojie Zhang ◽  
Xiaomin Guo
Keyword(s):  
Time Delay ◽  
Frequency Band ◽  
Secure Communication ◽  
Optical Feedback ◽  
Random Number Generation ◽  
Permutation Entropy ◽  
Growth Enhancement ◽  
Dynamical Process ◽  
Promising Tool ◽  
Entropy Growth

By frequency-band extracting, we experimentally and theoretically investigate time-delay signature (TDS) suppression and entropy growth enhancement of a chaotic optical-feedback semiconductor laser under different injection currents and feedback strengths. The TDS and entropy growth are quantified by the peak value of autocorrelation function and the difference of permutation entropy at the feedback delay time. At the optimal extracting bandwidth, the measured TDS is suppressed up to 96% compared to the original chaos, and the entropy growth is higher than the noise-dominated threshold, indicating that the dynamical process is noisy. The effects of extracting bandwidth and radio frequencies on the TDS and entropy growth are also clarified experimentally and theoretically. The experimental results are in good agreements with the theoretical results. The skewness of the laser intensity distribution is effectively improved to 0.001 with the optimal extracting bandwidth. This technique provides a promising tool to extract randomness and prepare desired entropy sources for chaotic secure communication and random number generation.

Microwave modulation of laser diodes with optical feedback

1991 ◽  
Vol 9 (4) ◽  
pp. 468-476 ◽  
Author(s):  
J. Helms ◽  
K. Petermann
Keyword(s):  
Optical Feedback ◽  
Laser Diodes ◽  
Microwave Modulation
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