Chirp signal is a kind of pulse-compressed signal with large time-bandwidth products achieved through linear frequency modulation. It has high resolution in range because of its great bandwidth.
线性调频信号是通过线性频率调制获得大的时宽带宽积的一种脉冲压缩信号，具有大的带宽，因此有高的距离分辨力。
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.
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。
The transversal intensity distribution remains nearly unchanged with increasing chirp parameter for relatively large values of the pulse duration.
脉冲宽度较大时，啁啾参数增大对横向光强的影响减小。
Compared to the theory signal, the chirp produced by DDS under large bandwidth, may have frequency distortion due to the limited chirp-rate.
受限于DDS芯片的调频转换速率，在大带宽下，DDS产生的线性调频信号相比理论信号可能存在频率失真。
And the ISRS-caused chirp is large and mainly change more complicatedly than the second-order soliton's chirp on the trailing edge after transmitting for about 2 soliton cycle length.
脉冲内拉曼散射所致啁啾在传输两个孤子周期以后，数值很大且主要在脉冲后沿呈现比二阶孤子啁啾还复杂的变化趋势。
And the ISRS-caused chirp is large and mainly change more complicatedly than the second-order soliton's chirp on the trailing edge after transmitting for about 2 soliton cycle length.
脉冲内拉曼散射所致啁啾在传输两个孤子周期以后，数值很大且主要在脉冲后沿呈现比二阶孤子啁啾还复杂的变化趋势。
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