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为了提高啁啾长周期光纤光栅(LPFG)光纤通信的色散补偿能力,提出了利用薄包层啁啾LPFG进行色散补偿的方法。首行介绍了根据传输信号确定啁啾LPFG的啁啾系数、光栅长度等参数的方法。然后利用上述方法设计了对光纤中传输的中心波长为1550 nm。带宽为0.2 nm的信号进行色散补偿的薄包层啁啾LPFG。利用耦合模理论及传输矩阵法计算了约1 m长的此种啁啾LPFG的色散,结果表明可以补偿该光信号通过46 km光纤所产生的色散。进一步分析了切趾函数、啁啾系数、交叉耦合系数等参数对薄包层啁啾LPFG色散的影响。
In order to improve the dispersion compensation ability of chirped long-period fiber grating (LPFG) optical fiber communication, a method of chromatic dispersion compensation using thin-layer chirped LPFG is proposed. The first line describes the method to determine parameters such as chirp coefficient and grating length of chirp LPFG based on the transmitted signal. Then use the above method to design the transmission of the center wavelength of the fiber is 1550 nm. Chirped - band Chirped LPFG for Dispersion - compensated Signals with a Bandwidth of. The dispersion of this chirp LPFG of about 1 m length was calculated using the coupled-mode theory and the transfer matrix method. The results show that it can compensate for the dispersion of the optical signal passing through the 46 km optical fiber. The influence of apodization function, chirp coefficient and cross-coupling coefficient on chirped LPFG chromatic dispersion was further analyzed.