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提出并实验了一种基于高非线性色散平坦微结构光纤的四进制光信号向二进制光信号的全光转换方案。由于自相位调制(SPM)效应,不同峰值功率的ps光脉冲经过微结构光纤传输后可获得不同展宽程度的输出频谱。基于以上原理,通过滤波可将1路10Gb/s的四进制信号转化成3路不同波长的10Gb/s二进制信号,再将3路信号进行适当的时延和衰减,最后耦合成为1路20Gb/s的二进制信号,实验获得的转换信号消光比达到3.2dB。
A scheme of all-optical conversion from quaternary optical signal to binary optical signal based on high nonlinear dispersion flat microstructured optical fiber is proposed and experimented. Due to the self-phase modulation (SPM) effect, different peak powers of ps light pulses can be transmitted through the microstructured optical fiber to obtain different spread spectrum output spectrum. Based on the above principle, one channel of 10Gb / s quaternary signal can be converted into three 10Gb / s binary signals of different wavelengths by filtering, and the three signals can be appropriately time-delayed and attenuated, finally being coupled into one 20Gb / s binary signal, experimentally obtained conversion signal extinction ratio reached 3.2dB.