Optical likelihood calculation for quadrature phase-shift keying signal based on silicon integrated waveguide
Optical likelihood calculation for quadrature phase-shift keying signal based on silicon integrated waveguide
复制标题
基于硅集成波导的正交相移键控信号的光学似然计算
DOI：
10.1049/ote2.12071
复制
发表时间：
2022
影响因子：
1.6
通讯作者：
Yohei aikawa
中科院分区：
文献类型：
--
作者：
Koki Makino;Hiroki Nagashima;Kiminori Maeda;Yohei aikawa
全光似然计算具有提高未来通信系统运行速度和功耗性能的潜力。作者提出了一种新的能够应用多值调制的似然计算方案。然而，这些研究有一个局限性，即需要更高的集成到实际系统中。在这项研究中，展示了一个4位正交相移键控（QPSK）调制信号（即两个顺序的QPSK符号）的光学似然计算装置。该集成器件由两个带硅波导的延时干涉仪组成。该器件根据4位代码串的类型设计如下（00 00）、（00 11）、（1100）和（11 11），并且通过示波器观察该器件的输出光波形，用于多个4位QPSK信号。从设备获得的光强度精确地对应于代码串与输入信号之间的汉明距离。结果表明，所提出的方案正确地计算了10 Gbaud下4位QPSK信号的可能性。
All‐optical likelihood calculation has the potential to improve the performance of operating speed and power consumption in future communication systems. The author previously proposed a novel scheme of likelihood calculation, which is capable of applying multi‐value modulation. However, these studies have a limitation that requires higher integration into an actual system. In this study, an optical device of likelihood calculation for a 4‐bit quadrature phase‐shift keying (QPSK) modulated signal (i.e. two sequential QPSK symbols) is demonstrated. The integrated device consists of two delayed interferometers with silicon waveguide. The device is designed according to the types of 4‐bit code string as follows (00 00), (00 11), (11 00), and (11 11), and the output light waveform from the device is observed by an oscilloscope for a plurality of 4‐bit QPSK signals. The light intensity obtained from the device accurately corresponds to the Hamming distance between the code string and the input signal. The results indicate that the proposed scheme correctly calculates a likelihood for a 4‐bit QPSK signal at 10 Gbaud.