基于复合衍射全息图的多路涡旋光解调技术

发布时间：2018-05-27 22:35

本文选题：正交频分复用 + 涡旋光　；参考：《上海大学学报(自然科学版)》2017年05期

【摘要】：将高斯光束入射到加载有复合衍射全息图的空间光调制器(spatial light modulator,SLM)上可一次生成多个涡旋光(optical vortex,OV);反之,将相应的涡旋光入射到相同全息图上,便可还原为高斯光,实现涡旋光的解调.由于传统的涡旋光通信系统中一个全息图只能解调一路入射涡旋光,故提出了一种基于复合衍射全息图的涡旋光解调法,该方法能利用一个全息图解调多路入射涡旋光,具有较好的应用前景.搭建了一个实验系统,实现了16QAMOFDM(quadrature amplitude modulation-orthogonal frequency division multiplexing,正交振幅调制-正交频分复用)光信号的涡旋光生成、传输和解调,将解调后的高斯光经过一系列离线处理得到了OFDM信号的星座图和各个子载波的误码率.实验结果表明,所有子载波的误码率均在前向纠错(forward error correction,FEC)门限之下,说明该方法具有良好的系统性能.
[Abstract]:When a Gao Si beam is incident into a spatial light modulator (SLM) loaded with a composite diffraction hologram, several optical vortices can be generated at one time, whereas the corresponding vortex light can be reduced to Gao Si light if the corresponding vortex light is incident onto the same hologram. The demodulation of vortex light is realized. Since a hologram can only demodulate the incident vortex light in a traditional vortex optical communication system, a new method based on composite diffraction hologram is proposed. The method can demodulate multi-channel incident vortex light by using a hologram. It has good application prospect. An experimental system is set up to realize the vortex light generation, transmission and demodulation of 16QAMOFDM(quadrature amplitude modulation-orthogonal frequency division multiplexing, quadrature amplitude modulation-quadrature frequency division multiplexing (OFDDM) optical signals. The demodulated Gao Si light is processed off-line to obtain the constellation diagram of the OFDM signal and the bit error rate of each sub-carrier. The experimental results show that the BER of all subcarriers is below the forward error correction threshold, which indicates that the proposed method has good system performance.
【作者单位】：上海大学通信与信息工程学院;
【基金】：国家自然科学基金资助项目(61420106011) 上海市科技创新行动计划资助项目(14511100100)
【分类号】：TN929.1

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