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采用3码片的超结构光纤布拉格光栅(SSFBG)作为编/解码器,该编/解码器光栅包含3段子光栅(空间码片),在相邻的空间码片的边界处存在离散的四相相移(0,π/2,π,3π/2)。利用四相编解码所具有的良好自相关和互相关特性,成功实现了单信道速率高达40 Gb/s,码片速率高达240 Gchip/s的全光编解码实验。据我们所知,这是利用光纤布拉格光栅作为编/解码器的全光码分复用(OCDM)系统所达到的最高单信道传输速率。理论计算和实验结果表明了利用超结构光纤布拉格光栅(SSFBG)实现多相高速全光编解码的可行性。这样高速的全光编解码可以应用于光码分复用系统和分组交换网络。
Using a three-chip superstructured Fiber Bragg Grating (SSFBG) as a coder / decoder, the encoder / decoder grating contains three sub-gratings (space chips) with discrete four-phase at the boundaries of adjacent space chips Phase shift (0, π / 2, π, 3π / 2). With the good autocorrelation and cross-correlation of the four-phase codec, the all-optical encoding and decoding experiment with single-channel rate up to 40 Gb / s and chip rate up to 240 Gchip / s has been successfully achieved. To the best of our knowledge, this is the highest single-channel transmission rate achieved with all optical code division multiplexing (OCDM) systems using fiber Bragg gratings as a codec. Theoretical calculations and experimental results show the feasibility of multiphase high speed all-optical encoding and decoding using super structure fiber Bragg grating (SSFBG). This high-speed all-optical encoding and decoding can be applied to optical code division multiplexing systems and packet-switched networks.