混沌信号在色散光纤传输过程中的演化

研究了色散光纤混沌传输理论及混沌信号与色散光纤相互作用的物理机制;通过耦合激光混沌系统和色散光纤传输信道,提出了色散光纤混沌信号传输演化物理模型;提出混沌信号在色散光纤传输中的非线性演化频率啁啾和公式;着重分析光纤色散对激光混沌信号传输与演化的作用,色散能够展宽混沌信号脉冲,但不影响混沌信号的形状;色散能够改变混沌信号每个频谱分量相位,但不影响混沌信号频谱形状;色散能够改变混沌信号光场慢变场分量的变化,但不改变混沌信号包络时变特性,也不影响混沌信号脉冲的功率分布和场强分布;色散能够改变混沌吸引子在相空间整体旋转角度并使其旋转角度随光纤传输长度而发生改变,但不改变混沌吸引子在相空间中的内部结构.最后数值模拟了混沌信号在光纤传输过程中的相位、场慢变部分分量以及混沌吸引子等演化形式等.

Chaotic signal evolution in its transmission in dispersion optical fiber

Theory of chaos transmission in dispersion optical fiber and physical mechanism of chaotic signal action on dispersion optical fiber are studied.A physical model of evolution of chaotic signal propagation in dispersion optical fiber is presented by coupling chaotic laser system with dispersion optical fiber channel.A frequency chipping of nonlinear evolution on chaotic signal in dispersion optical fiber and its expression are presented.An action of dispersion optical fiber is analyzed on chaotic signal propagation and evolution in detail. The dispersion can change the phase of frequency spectrum component of the chaotic signal, however,it cannot affect the spectrum shape of the chaotic signal.The dispersion can change the slow varying component of the chaotic signal,however,it does not change the time varying character and the distributions of power and intensity of the chaotic signal.The dispersion can change the global rotation angle of the chaotic attractor in phase space and let the rotation angle vary with optical fiber length,however,it cannot affect the internal configuration of the chaotic attractor.At last,evolhtions of the phase,the slow varying component and the attractor of the chaotic signal transmission in optical fiber are numerically simulated, respectively.