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基于非线性光纤环形腔镜(NOLM)及光子晶体光纤(PCF)的自相位调制效应(SPM),实现了一种适用于光子神经元的全光阈值器。所使用的PCF非线性系数为16.98(W·km)-1,同时在NOLM中引入可调隔离器。PCF及可调隔离器的使用,缩短了NOLM的腔长,同时降低了阈值器对输入光功率的要求。该全光阈值器对光信号的消光比可提高6 d B以上。由于全光阈值器中所有的组成器件均为无源光器件,因此能够处理高速率光信号。该全光阈值器在其他光通信系统中也具有广阔的应用前景。
Based on the self-phase modulation effect (SPM) of nonlinear fiber optic ring cavity mirrors (NOLMs) and photonic crystal fibers (PCFs), an all-optical thresholding device suitable for photon neurons is realized. The PCF nonlinear coefficient used was 16.98 (W · km) -1 while introducing an adjustable isolator in the NOLM. The use of PCFs and tunable isolators shortens the cavity length of NOLMs while reducing the threshold requirement for input optical power. The total light threshold extinction ratio of the optical signal can be increased more than 6 dB. Since all components in the plenoptic threshold device are passive optical devices, they can handle high-rate optical signals. The plenoptic threshold device also has a broad application prospect in other optical communication systems.