基于耦合双环阵列的二维相干光码分多址编解码器

Two-Dimensional Coherent Optical En/Decoder Based on Parallel-Cascaded Coupled Micro-Ring Reflector

可集成、易调谐的光编解码器是光码分多址(OCDMA)系统集成化的关键模块之一。基于耦合双环阵列提出了一种新型的光编解码器。该编解码器通过调谐双环下载端反射波长以及集成于总线的相移器的相位,实现了OCDMA系统的二维相干编解码。基于耦合模理论,建立了耦合双环阵列的传输矩阵方程。用于编解码器的双环半径分别为50μm和48μm,阵列中四组双环的反射中心波长分别为1535,1535.2,1535.4,1535.6nm,信道宽度为17GHz,反射谱3dB带宽约为0.14nm,信号基本上不会出现干扰,保证了用户发送和接收信号的准确性。相应的自相关峰值旁瓣比(P/W)约为5,互相关峰值比(P/C)约为7,可以容纳用户数为96个。

One of the key modules in the integrated optical code division multiple access （OCDMA） system is highlyintegrated, easily tuning optical en/decoder. Two-dimensional coherent optical en/decoder based on parallel-cascadedcoupled micro-ring reflector is proposed. This device can enable simulaneonsly to tune the wavelength hopping ofdual-ring down load end and the phase of intergrated phase shifter in the bus. According to the coupled mode theory,transfer matrix equations for this cascaded reflector are established. The radii for this dual-ring resonator are 50 μm and48 μm, respectively. The resonant central wavelengths for each reflector are 1535, 1535.2, 1535.4, 1535.6 nm. Eachreflected spectrum has a 3 dB bandwidth of 0.14 nm with a channel spacing of 17 GHz, ensuring the accuracy of thetransmitted and received signals. Correspondingly, the number of possible users is 96 with autocorrelation peaksidelobe ratio （P/W） about 5 and cross-correlation peak ratio （P/C） about 7.