Application of the multi-channel fiber Bragg grating to the high-speed and broadband optical communication system

在本研究中，我们提出了一种纯相位采样FBG的理论，并证明了采样的N通道FBG需要的最大折射率调制比单通道FBG高√<N>倍。提出了一种新的连续纯相位采样函数，该函数能产生多达81通道的光纤光栅，具有良好的通道均匀性和高带内能量效率，并利用模拟退火算法对其进行了优化。为了用传统的侧写相位掩模技术制备这种fbg，还对移相相位掩模的衍射效应和制造公差进行了研究。与数值结果比较，成功地演示了45通道（间隔100 GHz）和81通道（间隔50 GHz）的纯相位采样线性啁啾光纤光栅。我们提出了一种新的多通道光纤光栅设计方法，使我们能够设计任何一种多通道光纤光栅，其中每个通道的频谱响应可以是相同的，也可以是不相同的。特别地，9通道非线性啁啾光纤光栅被用于同时色散和色散斜率补偿器。本文提出了一种基于全光纤不对称Sagnac环干涉仪（ASLI）的多通道光纤布拉格光栅色散测量新方法，并对该方法进行了详细的理论分析。用该方法同时测量了51通道光纤光栅的色散和色散斜率。实验结果与一般相移法（PSM）的结果吻合较好。该方法具有结构简单、成本低、对光纤光栅特性的容忍度高等优点。我们提出了一种新的方法来实现纯相位采样光纤布拉格光栅（FBG）的反射均衡，其中光栅被专门设计为同时色散和色散斜率补偿器，通道高达51。采用线性啁啾采样周期给出了采样函数的解析形式，并采用模拟退火算法进行了优化。少

In this study, we have presented a theory for the phase-only sampled FBG and demonstrate that a sampled FBG of Nchannels would require √<N> times higher the maximum refractive index-modulation than that of the single-channel FBG. A novel continuous phase-only sampling function capable of producing up to 81-channel FBG with excellent channel uniformity and high in-band energy efficiency is presented and optimized by using the simulated annealing algorithm. In order to fabricate this kind of FBGs with a conventional side-writing phase-mask technique, both the diffraction effects and fabrication tolerance of the phase-shifted phase mask have also been addressed. Compared with the numerical results, a 45-channel (spacing of 100 GHz) and, an 81-channel (spacing of 50 GHz) phase-only sampled linearly chirped FBG are successfully demonstrated.We have presented a novel method for multi-channel FBG design, which enables us to design any kind of multi-channel FBGs where the spectrum response of … More each channel could be either identical or non-identical. Particularly, 9-channel nonlinearly chirped FBG used as simultaneously dispersion and dispersion slope compensator has been demonstrated.We have demonstrated a novel method to measure the chromatic dispersion of a multi-channel fiber Bragg grating (FBG), which is based on an all-fiber asymmetrical Sagnac loop interferometer (ASLI) proposed Theoretical analyses to this proposed approach are presented in details. With this method, the chromatic dispersion and dispersion slope of a 51-channel FBG are simultaneously measured. The experimental results agree well with the ones obtained by using the general phase-shift method (PSM). This method has the advantages of simple configuration, low-cost, and high tolerance for the characteristics of FBG.We have presented a novel approach for the reflection equalization of a phase-only sampled fiber Bragg grating (FBG), where the grating is specially designed as a simultaneous dispersion and dispersion-slope compensator with channels up to 51. The sampling-function used is given with an analytical form with a linearly-chirped sampling period and is optimized by using the simulated annealing algorithm. Less