Hui Zhanqiang, Pan Deng, Wen Xijian
Appl Opt. 2021 Dec 20;60(36):11075-11083. doi: 10.1364/AO.442601.
The on-chip all-optical quantizer is a key functional module to realize all-optical analog-to-digital conversion. It has important applications in future optical communication and ultrafast all-optical signal processing systems. To the best of our knowledge, a novel all-optical quantization scheme based on the cross-polarization modulation effect in a double-ridge -:- waveguide is proposed. For the optimized waveguide, the maximum nonlinear coefficient and transmission loss at the probe wavelength are 2680.5 and 2.246 dB/cm, respectively. The simulation results of the proposed all-optical quantizer show that a nonlinear phase shift of 8 can be generated in the 8.79 mm long waveguide when the peak pump light power is 0.8 W. A 16-level quantization and a 4-bit quantization resolution are obtained. The effective number of bits is 3.79-bit, which is only 0.21-bit away from the ideal resolution.
片上全光量化器是实现全光模数转换的关键功能模块。它在未来光通信和超快全光信号处理系统中具有重要应用。据我们所知，提出了一种基于双脊波导中交叉偏振调制效应的新型全光量化方案。对于优化后的波导，探测波长处的最大非线性系数和传输损耗分别为2680.5和2.246 dB/cm。所提出的全光量化器的仿真结果表明，当峰值泵浦光功率为0.8 W时，在8.79 mm长的波导中可产生8的非线性相移。获得了16级量化和4位量化分辨率。有效位数为3.79位，仅比理想分辨率低0.21位。
