BPSK-QPSK和QPSK-16QAM的光调制格式转换  

Optical modulation format conversion for BPSK-QPSK and QPSK-16QAM

作　　者：林昭 王兴财 冯世杰 LIN Zhao;WANG Xingcai;FENG Shijie(Research Institute of Electronic Science and Technology,University of Electronic Science and Technology of China,Chengdu Sichuan 611731,China)

机构地区：[1]电子科技大学电子科学技术研究院,四川成都611731

出　　处：《太赫兹科学与电子信息学报》2024年第3期309-315,共7页Journal of Terahertz Science and Electronic Information Technology

摘　　要：信号在调制方式不同的系统之间传输时,需要对信号调制格式进行转换,而调制格式转换通常在电信号上进行,要将光信号恢复成电信号。在电信号上进行调制格式转换后,再经电光调制器变换成光信号发射。频繁的光电或电光转换通常会增加系统成本,针对该问题,提出了利用相干叠加在光域上实现二进制相移键控(BPSK)到正交相移键控(QPSK)以及QPSK到正交幅度调制(16QAM)的调制格式转换的方法。实验通过Optisystem软件对转换模型进行仿真,采用10 Gpbs伪随机信号作为测试信源,通过星座图观测出信号成功转换为QPSK和16QAM;并在不同光信噪比、光源线宽和信号功率下对转换模型与直接QPSK、16QAM传输模型进行误码分析对比,在相同条件下转换模型和直接传输的误码率高度保持一致,表明这种调制格式转换方法具有较高的稳定性和准确性,能够适用于不同系统间的信号传输。When the signal is transmitted between systems with different modulation methods,the modulation format needs to be converted.Modulation format conversion is usually carried out on electrical signals and requires a process of electro-optical conversion after optical-electro conversion.Frequent optical-electro or electro-optical conversion usually increases the system cost.To address this problem,the implementation of format conversion from Binary Phase Shift Keying(BPSK)to Quadrature Phase Shift Keying(QPSK)and from QPSK to Quadrature Amplitude Modulation(16QAM)by using coherent superposition methods on the optical domain is proposed.In the experiment,the conversion model is simulated by Optisystem software,Taking 10 Gpbs pseudo-random signal as the test signal,it is successfully converted to QPSK and 16QAM observed by constellation diagrams.The Bit Error Rate(BER)of the conversion model and the direct QPSK and 16QAM transmission models are compared under different Optical Signal Noise Ratios(OSNRs),optical source bandwidths and signal powers.The BERs of the conversion model and the direct transmission remain highly consistent under the same conditions,indicating that this modulation format conversion method has high stability and accuracy,and can be applied to signal transmission between different systems.

关 键 词：光通信 调制 二进制相移键控 正交相移键控 正交幅度调制 

分 类 号：TN929[电子电信—通信与信息系统]