采用啁啾光纤光栅补偿带啁啾的超高斯脉冲在光纤中传输的色散

Chirped fiber grating compensating dispersion of chirped super Gaussian pulses transmitting in the fiber

利用啁啾光纤光栅,对带啁啾的超高斯脉冲的色散补偿特性进行了理论分析和数值模拟。数值模拟结果表明,光脉冲在普通单模光纤中传输了一定距离后,由于色散的作用,脉冲发生展宽,超高斯脉冲比高斯脉冲展得更宽。若初始脉冲含有啁啾,展宽后的脉冲还出现小调制。用啁啾光纤光栅进行色散补偿后,高斯型脉冲能够较好的恢复初始脉冲形状,带啁啾的超高斯脉冲的脉宽可恢复到接近初始脉冲的宽度,但脉冲形状发生了畸变,并出现了旁瓣,脉冲峰值功率与超高斯脉冲阶数和啁啾参数有关。

By using the chirped fiber grating, theoretically study and numerical simulation have been made on the compensating dispersion property of chirped super Ganssian pulses transmitting in the fiber. The study shows that after transmitting some distance in a fiber, the pulses will become broadened because of dispersion, and the super Gaussian pulses will be broadened more greatly, compared with Ganssian pulses. Besides, the broadened pulses have a little medulafion for originally chirped pulses. By using the chirped fiber grating, the dispersion of Gaussian pulses can be well compensuted ,while the chirped super Gaussian pulses width approximate to the original pulses width, but the shape becomes distorted, and the pulses have a little side slob. In addition, the max - power of pulses have something to do with the order and the chirp coefficient of original pulses.