Chinese Optics Letters, 2015, 13 (9): 091401, Published Online: Sep. 14, 2018
Time-delay signature concealment of polarization-resolved chaos outputs in vertical-cavity surface-emitting lasers with variable-polarization filtered optical feedback
Abstract
Through employing permutation entropy and the self-correlation function, the time-delay signature (TDS) of a vertical-cavity surface-emitting laser (VCSEL) with variable-polarization filtered optical feedback (VPFOF) is evaluated theoretically. The work shows that the feedback rate η , polarizer angle θ p , and filter bandwidth Λ have an obvious influence on the TDS. The evolution maps of the TDS in parameter space ( η , Λ ) and ( η , θ p ) are simulated for searching the chaos with weak TDS. Furthermore, compared with a VCSEL with polarization-preserved filtered optical feedback and a VCSEL with variable-polarization mirror optical feedback, this VPFOF–VCSEL shows superiority in TDS suppression.
Li Zhou, Guangqiong Xia, Zhuqiang Zhong, Jiagui Wu, Shuntian Wang, Zhengmao Wu. Time-delay signature concealment of polarization-resolved chaos outputs in vertical-cavity surface-emitting lasers with variable-polarization filtered optical feedback[J]. Chinese Optics Letters, 2015, 13(9): 091401.