基于加权光耦合阵列的任意波形产生

提出了基于加权光耦合阵列的光电任意波形产生方案,利用不同波长加权和并行耦合的方法实现信号光域的数模转换。通过对信号的频谱分析发现,多波加权存在拍频噪声,经过波长预设和滤波处理,可以将高频噪声有效滤除,但在信号交变的时刻会有尖峰干扰出现,进一步通过与变换信号带宽匹配的滤波平滑处理后,尖峰干扰得到一定的抑制,可实现输入信号速率为10 Gb/s、量化精度为5 bit的光学数模转换,实现了三角波、锯齿波、高斯脉冲和方波序列等光学波形的输出。

Research on Arbitrary Waveform Generation Technology Based on Weighted Optical Coupling Array

A weighted optical coupling array-based photoelectric arbitrary waveform generation scheme was proposed. In this scheme, different wavelength weighting and parallel coupling method were used to realize the DAC transform of signal optical domain. Through the spectral analysis of the signal, the time domain waveform was interfered by beat noise which was concentrated in the high frequency region. After wavelength presetting and filtering process, the high frequency noise could be effectively filtered out. However, some peak interference would appear at the time of signal alternation. When further filtering and smoothing process matching the bandwidth of the transform signal, the peak interference could be suppressed to a certain extent. Finally, the triangle wave, sawtooth wave, Gaussian pulse and square wave sequence were realized by the optical digital-to-analog conversion with signal rate of 10Gb/s and quantization accuracy of 5bits.