Effect of Gain Nonlinearity on Time Delay Signature of Chaos in External-Cavity Semiconductor Lasers
Effect of Gain Nonlinearity on Time Delay Signature of Chaos in External-Cavity Semiconductor Lasers
复制标题
增益非线性对外腔半导体激光器混沌时滞特征的影响
DOI：
10.1109/jqe.2016.2538729
复制
发表时间：
2016-03
影响因子：
2.5
通讯作者：
Lin, Lin
中科院分区：
文献类型：
--
作者：
Zhang, Hao;Li, Jia Fu;Zhang, Hui Xing;Lin, Lin
数值研究了增益非线性对光反馈半导体激光器中强度混沌和相位混沌的时间延迟特性的影响。本文主要讨论了单径反馈的SL，为了通用起见，也讨论了双径反馈的SL。通过自相关函数（ACF）和排列熵函数来评估TDS。结果表明，当注入电流较大、反馈强度较低时，TDS对非线性增益因子（NGF）更为敏感。在一定的反馈强度下，低NGF的SL可以降低TDS附近的强度和相位混沌的ACF峰高，特别是当注入电流相对较高时。此外，在反馈强度和注入电流参数平面上，低NGF可以在更宽的区域内成功地实现TDS隐藏。因此，仔细选择一个内部参数是一个有效的候选人TDS隐藏在更广泛的参数范围内，这是补充现有的技术，通过控制外部参数，因此是非常可取的混沌为基础的安全通信扩展的密钥空间。
The effects of gain nonlinearity on the time delay signature (TDS) of both intensity and phase chaos in semiconductor lasers (SLs) with optical feedback are investigated numerically. The SLs subject to single-path feedback are mainly considered, and SLs with dual-path feedback are also discussed for the sake of generality. The TDS is evaluated via both auto-correlation function (ACF) and permutation entropy function. It is found that the TDS is more sensitive to nonlinear gain factor (NGF) for large injection current and low feedback strength. For given feedback strength, the peak heights of ACF for both intensity and phase chaos around TDS can be decreased by using SL with low NGF, especially when the injection current is relative high. Furthermore, with low NGF, successful TDS concealment can be achieved in wider region in the parameter planes of feedback strength and injection current. Hence, careful selection of an internal parameter is an effective candidate for TDS concealment in wider parameter region, which is complementary to the existing techniques by controlling the external parameters, and thus is highly desirable for expanding the key space for chaos-based secure communication.
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DOI：
10.1109/jstqe.2013.2244567
发表时间：
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影响因子：
4.9
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