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利用二次谐波频率分辨光学门脉冲分析仪从实验上分析研究了具有啁啾的10 GHz光脉冲在不同输入功率下演化形成孤子的规律和特点。实验发现:输入脉冲在光纤中传输3.5个色散长度时,其时间宽度、频率啁啾和时间带宽积都随着输入功率的增加而减小。当输入功率大于一阶孤子功率的理论值时,光脉冲能够演化形成孤子;脉冲在随后传输过程中其宽度基本保持不变,波形、频率啁啾和时间带宽积仍随着传输距离的变化而变化;输入功率越高,形成的一阶孤子脉冲的宽度越窄。当输入功率小于一阶孤子功率的理论值时,输出脉冲的时间宽度随着传输距离的增加而增加,频率啁啾随着传输距离的增加而减小,光脉冲不能演化形成孤子。
The second harmonic frequency resolution optical gate pulse analyzer was used to analyze and study the regularities and characteristics of the chirped 10 GHz optical pulse evolving into solitons at different input powers. The experimental results show that the time width, frequency chirp and time-bandwidth product of the input pulse decrease with the input power when the input pulse is transmitted 3.5 times in the optical fiber. When the input power is greater than the theoretical value of the first-order soliton power, the light pulse can evolve to form a soliton. The width of the pulse in the subsequent transmission remains basically unchanged. The waveform, the frequency chirp and the time-bandwidth product change with the transmission distance The higher the input power, the narrower the width of the first-order soliton pulse. When the input power is less than the theoretical value of the first-order soliton power, the time width of the output pulse increases with the transmission distance, the frequency chirp decreases with the increase of the transmission distance, and the light pulse can not evolve to form a soliton.