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实验研究了一种基于谐波拟合产生周期性三角形光脉冲串的方法,方案首先利用马赫曾德调制器的载波抑制调制,获得具有周期性起伏的连续光强度信号,然后利用光纤色散所致的射频功率衰落效应,对光强度表达式中四次谐波分量进行抑制,调节调制深度后,光强度表达式将向理想三角形傅里叶展开式的前三项进行逼近,最后以谐波拟合的方式获得重复频率为射频调制频率二倍的周期性三角形光脉冲串.结合实验,在9.862 GHz和7.678 GHz射频调制频率下,获得了脉冲重复频率19.724 Gb/s(脉冲全宽约50.7 ps)和15.356Gb/s(脉冲全宽约65.1 ps)的稳定三角形光脉冲串输出,改变色散量并反向调节调制频率,可进一步改变脉冲的重复频率,所获得的实验结果与理论预期基本符合.
A method of generating periodic triangular optical pulse train based on harmonic fitting is experimentally studied. The scheme firstly uses the carrier suppression modulation of the Mach-Zehnder modulator to obtain a continuous light intensity signal with periodic undulation, and then uses the fiber dispersion , The fourth harmonic component in the light intensity expression is suppressed. After the modulation depth is adjusted, the light intensity expression is approximated to the first three terms of the ideal triangular Fourier expansion. Finally, the harmonic content , A periodic triangular optical pulse train whose repetition frequency is twice that of the RF modulation frequency was obtained.According to experiments, the pulse repetition frequency of 19.724 Gb / s was obtained at the RF modulation frequency of 9.862 GHz and 7.678 GHz ) And 15.356Gb / s (pulse width of about 65.1 ps) stable triangular optical pulse train output, change the amount of dispersion and reverse modulation frequency modulation, you can further change the pulse repetition frequency, the experimental results obtained and the theoretical expectation is basically in line with .