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为进一步拓宽长周期光纤光栅在光通信领域中的应用,在长周期光纤光栅中引入纯切趾包络和线性啁啾,构成光谱特性更为丰富的纯切趾线性啁啾长周期光纤光栅。采用耦合模理论,对纯切趾线性啁啾长周期光纤光栅中的模式耦合特性进行了研究,给出了纯切趾线性啁啾长周期光纤光栅的耦合系数和耦合模方程。在此基础上,详细研究了啁啾和切趾对长周期光纤光栅光谱特性的影响,讨论了纯切趾长周期光纤光栅用作色散补偿器的结构特性和色散补偿机制。最后,设计出一种采用两个相同光栅对称级联的基于纯切趾线性啁啾长周期光纤光栅的色散补偿器,该器件的3dB带宽为0.16nm,3dB带宽内的色散值约为-1954psnm,时延曲线偏离线性的波动幅度小于±2.5ps。
In order to further broaden the application of long-period fiber gratings in the field of optical communications, pure apodization and linear chirp are introduced into long-period fiber gratings to form pure Chirp long-period fiber gratings with more abundant spectral characteristics. Coupling mode theory is used to study the mode coupling characteristics of pure apodization linear chirped long period fiber gratings. The coupling coefficients and coupled mode equations of the pure apodization linear chirped long period fiber gratings are given. On this basis, the effects of chirp and apodization on the spectral characteristics of long-period fiber gratings are studied in detail, and the structure and dispersion compensation mechanism of pure-cut to long-period fiber gratings for dispersion compensators is discussed. Finally, a chromatic dispersion compensator based on Pure Chirped Long-Period Fiber Bragg Grating (FBG) with two identical cascaded cascades of grating was designed. The 3dB bandwidth of the device is 0.16nm, and the dispersion in 3dB bandwidth is about -1954psnm , The deviation of the delay curve from linearity is less than ± 2.5ps.