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成功演示了码片速率高达280 Gchip/s的全光编解码,编解码光栅是采用“等效相移”方法制作而成的超结构光纤布拉格光栅(SSFBG)。考虑和分析了信道间干涉,实验验证了40 Gb/s×2的光码分复用(OCDM)信号复用。引入非线性光学环镜(NOLM))来抑制信道间干涉,利用非线性光学环镜的非线性开关特性将解码输出脉冲的宽度由7.7 ps压缩至3.8 ps,并同时有效的减小了干扰噪声,进而提高系统性能。理论计算和实验结果表明了采用超结构光纤布拉格光栅和非线性光学环镜实现高效编解码的可行性。高速的全光编解码可以应用于点到点的光码分复用系统以及光标签交换网络。
The successful demonstration of all-optical encoder and decoder with a chip rate up to 280 Gchip / s is a superstructure fiber Bragg grating (SSFBG) fabricated using the “equivalent phase shift” method. The inter-channel interference is considered and analyzed, and the OCDM signal multiplexing of 40 Gb / s × 2 is experimentally verified. Nonlinear optical ring mirror (NOLM)) is introduced to suppress the inter-channel interference. The non-linear switching characteristic of the nonlinear optical ring mirror is used to compress the width of the decoded output pulse from 7.7 ps to 3.8 ps and effectively reduce the interference noise , Thereby improving system performance. The theoretical calculation and experimental results show the feasibility of using high-structure fiber Bragg gratings and nonlinear optical ring mirror to realize efficient coding and decoding. All-optical high-speed encoding and decoding can be applied to point-point optical code division multiplexing system and optical label switching network.