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    It is found that reducing the amplifiers peak power (10~12 dB·m) and introducing proper negative chirp(-1) into the launched pulses can remarkably extend the operating distance of the PMD compensation system.
    发现降低放大器输出峰值功率(10~12dB·m)和引入适当的初始负啁啾(-1)可以显著增大PMD补偿系统作用距离。
    When the initial chirp of optical pulse is nonzero, the initial negative chirped pulse is compressed in positive dispersion fibers, the compression ratio decreases with the increase of the peak power of the input pulse;
    当光脉冲的初始频率啁啾不为零时,负啁啾脉冲在光纤正色散区被压缩,随着初始脉冲峰值功率的增高,脉冲的压缩比减小;
    Nowadays, the optical pulse used in the OTDM system is often generated by the gain-switched distributed-feedback (GS-DFB) semiconductor laser, which has a large pulse width and negative chirp. Therefore, to satisfy the demand of the OTDM system, the technique of optical pulse compression must be applied.
    目前常采用GS-DFB半导体激光器作为OTDM系统的光脉冲源,这种脉冲源产生的光脉冲一般较宽,并带有一定的负啁啾,因而必须采用光脉冲压缩技术才能满足高速OTDM系统的要求。
    This scheme can be used to compress and amplify the pico-second pulses with negative chirp.
    此方案对具有负啁啾的皮秒脉冲均具有较好的压缩和放大效果。
    Therefore, in order to satisfy the demand of the OTDM system, the technique of optical pulse compression must be adopted.
    并带有一定的负啁啾,因而必须采用光脉冲压缩技术才能满足高速OTDM系统的要求。
    A new phenomena was found. The spectral feature of the positive chirp pulse transmission along normal dispersion fiber was changed.
    在对光脉冲消啁啾过程中发现了一个新的现象:适当长度的正常色散光纤消啁啾不仅能够压窄负啁啾的脉宽,而且能够压窄频谱
    It is found by the experiment that the spectral width will be changed when the optical pulse of the positive chirp transmitts along normal dispersion fiber.
    通过实验发现:采用适当长度的正常色散光纤消负啁啾,不仅能够压窄负啁啾的脉宽而且能够压窄频谱。
    Influence of initial chirp on the propagation properties of two-back-soliton pulse in optical fibers is studied by means of variational method·lt shows that negative initial chirp can reduce the repulsive interaction between neighbering black solitons.
    本文采用变分法研究了初始啁啾对光纤中双黑孤子脉冲传输特性的影响。 结果表明:初始负啁啾将减弱邻近黑孤子间的排斥相互作用
    Simultaneously,selecting negative chirped pump pulse and positive chirped soliton pulse will obtain shorter compressed pulse.
    同时选取负啁啾的泵浦脉冲和正啁啾的孤子脉冲易于产生更短的压缩光脉冲
    and the negative initial chirps improve the transmission characteristics of the soliton by precompensation.
    负啁啾可以提高前补偿系统中孤子的传输性能。
    It is also found that the pump pulse power, pump frequency chirp and various pulse widths have great effects on soliton pulse compression.
    在抽运功率一定的条件下 ,选取负啁啾的抽运脉冲 ,可获得更高压缩比的压缩光脉冲。
    The pulse profile and the chirp evolution of the chirped solitons during the propagation are studied, the stretching and compressing process of solitons with positive and negative initial chirps are analyzed with numerical simulation, and the consequent impact of initial chirps on the soliton transmission is summarized.
    研究啁啾孤子在传输过程中的脉冲形状和频率啁啾的演化过程。 分别分析了具有初始正、负啁啾孤子在传输过程中的脉冲展宽和压缩的全过程,总结出啁啾孤子对通信系统性能的影响。
    By solving the coupled nonlinear Schrdinger equation in single-mode fiber,the effect of pumped pulse with initial chirp on Soliton pulse compression is studied. The results show that the pumped pulse with initial chirp can be in favour of signal pulse compression with effects of walk-off and initial time delay.
    本文从描述双皮秒脉冲在单模光纤中共同传输的耦合NLS方程出发 ,研究了具有啁啾因子的泵浦脉冲对孤子脉冲压缩的影响 ,结果表明 :泵浦脉冲具有初始啁啾时 ,会有利于存在离散效应和初始延时的信号脉冲的压缩 ,脉冲的压缩比随着正啁啾因子的增加而缓慢增加 ,负啁啾因子则相反
 

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