基于太赫兹光解复用器-四波混频效应的全光异或门方案

An All-optical Exclusive-OR Gate Based on Terahertz Optical Asymmetric Demultiplexer-four Wave Mixing Effect

为了解决基于太赫兹光解复用器-交叉相位调制效应全光异或门的三个问题,即严格的同步要求;不能应用于输入信号为非归零码信号的情况;异或处理速率受半导体光放大器载流子速率限制.提出了一种应用于输入为开关调制信号,利用太赫兹光解复用器结构,基于半导体光放大器四波混频效应的全光异或门方案.该方案由于基于四波混频效应,因此能从根本上解决基于太赫兹光解复用器-交叉相位调制效应全光异或门方案所存在的三个问题.通过理论分析介绍了该方案的原理,并通过仿真分别实现了该方案对输入为40Gbps,归零码信号;80Gbps,归零码信号;10Gbps,非归零码信号的异或操作.三种输入信号对应的异或输出Q因子与误码率分别为11.7,2.4×10-18;8,1.1×10-10;22,1.3×10-40.分析了太赫兹光解复用器主要组成元件参数,以及温度起伏与色散效应对异或们输出信号质量的影响.理论分析与仿真共同验证了该方案对于解决基于太赫兹光解复用器-交叉相位调制效应全光异或门三种问题的可行性与有效性.

In order to solve the three problems of terahertz optical asymmetric demultiplexer-cross phase modulation effect based all-optical exclusive-OR gate, which are that the strict demand of synchronization; cannot be applied in the situation of not return to zero signal input; the speed of exclusive-OR operation is limited by carrier recovery speed of semiconduetor optical amplifier. An all-optical exclusive-OR gate was proposed which utilizes the structure of terahertz optical asymmetric demultiplexer and is based on four wave mixing effect, because of based on four wave mixing, this exclusive-OR gate can radically solve the mentioned three problems of terahertz optical asymmetric demultiplexer-eross phase modulation based exclusive-OR gate. This paper illustrates the principle of this exclusive-OR gate through theoretic analyse, and realizes the exclusive-OR operation for the input of 40 Gbps, return to zero signal; 80 Gbps, return to zero signal; 10 Gbps, not return to zero signal. The Q factor and bit error rate of exclusive-OR operation for above three kinds of input are 11.7,2.4×10^-18;8,1.1×10^-10;22,1.3×10^-4.And then, we analyse the influence on the quality of exclusive-OR output signal which is generated by change of parameter of main elements of terahertz optical asymmetric demultiplexer and temperature and dispersion effect. The feasibility and effectiveness of this exclusive-OR gate for solving the three problems of terahertz optical asymmetric demultiplexer-cross phase modulation based all-optical exclusive-OR gate are verified by theoretic analyse and simulation.