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

在这项研究中，我们提出了一种纯位相型取样光纤光栅的理论，并证明了N个通道的取样光纤光栅所需的最大折射率调制比单通道光纤布拉格光纤光栅高√&lt；N&gt；倍。提出了一种新颖的连续纯相位采样函数，该函数能够产生高达81通道的FBG，具有良好的通道均匀性和高的带内能量效率，并利用模拟退火法对其进行了优化。为了用传统的侧写式相位掩模技术制作这种FBG，还研究了相移相位掩模的衍射效应和制作误差。与数值计算结果相比较，成功地实现了45通道(间距100GHz)和81通道(间距50 GHz)取样线性啁啾光纤布拉格光纤陀螺，为多通道…光纤布拉格光纤光栅的设计提供了一种新的方法，使我们能够设计出任何类型的多通道FBG此外，每个通道可以是相同的，也可以是不相同的。提出了一种基于全光纤非对称Sagnac环干涉仪(ASLI)的多通道光纤布拉格光栅(FBG)色散测量的新方法，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FBG的色散和色散斜率。实验结果与用普通相移法(PSM)得到的结果吻合较好。该方法具有结构简单、成本低、对光纤布拉格光纤光栅的特性容忍度高等优点。提出了一种新的全位相采样光纤布拉格光栅(FBG)的反射均衡方法，该方法特别设计为同时色散和色散斜率补偿器，通道可达51个。给出了具有线性啁啾采样周期的采样函数的解析形式，并利用模拟退火法对采样函数进行了优化。较少

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