基于加权光耦合阵列的任意波形产生技术研究

Arbitrary waveform generation based on optical weighted byfiber coupler array

摘要:

本文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DAC变换。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的尖峰干扰出现,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10Gbps,量化精度为5比特的光学数模转换,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。

Abstract:

The scheme of arbitrary waveform generation based on optical weighted by fiber coupler array is proposed. In this scheme, arbitrary waveform generation is complete by weighting the intensities of multiple optical carriers with different wavelengths and combining them according to the parallel input of binary dates. The simulation results show that the time domain waveform is interfered by beat noise which is concentrated in the high frequency region. So, it can be removed effectively by the low-pass filter. However, some peak interference will appear at the time of signal alternation. When the filtering processing matching with the bandwidth of the transform signal, the peak interference can be suppressed. Finally, the triangle wave, sawtooth wave, Gauss pulse and square wave sequence can be realized by the optical digital-to-analog conversion with signal rate of 10Gbps and quantization accuracy of 5 bits.