一种降低列阵波导光栅相邻信道串扰的方法

A Way of Adjacent Crosstalk Reduction for AWGs

阵列波导光栅 (AWG)作为波长滤波器在光通信领域具有很大的应用前景。串扰是影响阵列波导光栅应用的重要因素之一。为了降低阵列波导光栅相邻信道的串扰 ,本文提出并研究了一种降低阵列波导光栅的新方法。该方法利用阵列波导光栅的衍射特点性 ,通过调节阵列波导光栅的自由光谱范围 (FSR)、罗兰圆焦距和阵列波导数目 ,使得各信道信号的输出极小值处于其它信道输出波导中心 ,无次极大处于其它波导中 ,从而降低了阵列波导光栅的串扰 ,特别是相邻信道之间的串扰。通过光束传播方法 (BPM)的模拟了具有不同FSR的 1× 16阵列波导光栅 ,结果显示 ,该方法能将相邻信道之间的串扰降低约 5 .7dB。

The arrayed waveguide grating (AWG) has greatly prospective in optical communication as a wavelength filter. Crosstalk is one of the most important factors which block the wide use of AWGs. In order to reduce the crosstalk of an AWG, a new method was proposed and studied in this paper. In this method, the output minimum of a channel is located at the center of the waveguides of other channels and there is no sidelobes of the channel in the waveguides of other channels in the mean time by adjusting the free spectrum range (FSR) of AWG, foca length of Rowland circle and the number of the waveguide array. Thus the crosstalk of an AWG, pecially the adjacent crosstalk can be reduced greatly. Numerical approaching of 1×16 AWGs with different FSR by beam propagation method (BPM) shows the adjacent crosstalk can be reduced about 5.7 dB by this method.