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传统使用半导体光放大器(SOA)中交叉相位调制(XPM)效应构成全光逻辑异或(XOR)门的方案,由于受到单个SOA中XPM效应自身原理的限制,需要精确的相位控制。本文提出了一种基于马赫-增德尔干涉仪(MZI)和级联SOA中XPM效应实现全光逻辑异或门的新方案。本文方案使用对称的MZI结构,在两臂上分别放置两个级联的SOA,通过对时钟光的相位调制,达到对两级输入信号光进行XOR运算的目的。在40Gbit/s下的仿真结果表明,本方案易于调节,只需要两束输入信号光以相反比例分光,即可对其进行异或逻辑运算,在放宽了分光比取值范围的同时,也降低了对XPM效应中相位控制的要求,实现了宽相位容限的全光逻辑XOR门。研究了时钟光功率和输入信号分光比对逻辑运算结果的影响,发现输入信号分光比的不同步变化对输出信号质量的影响较为明显。对提高方案速率的方法进行了讨论。
The traditional scheme of using an All-Optical XOR gate using the Cross-Phase Modulation (XPM) effect in a semiconductor optical amplifier (SOA), requires precise phase control due to the limitations of the XPM effect itself in a single SOA. In this paper, a new scheme of all-optical logic XOR gate based on Mach-Zehnder interferometer (MZI) and XPM effect in cascaded SOA is proposed. In this paper, a symmetric MZI structure is used. Two cascaded SOAs are placed on the two arms respectively. The phase modulation of the clock light achieves the purpose of XORing the two input signal lights. The simulation results at 40Gbit / s show that this scheme can be easily adjusted. Only two input signal lights need to be split in the opposite proportion, then they can be XORed. When the splitting ratio is widened, the value is also reduced The requirement of phase control in XPM effect has realized the all-optical logic XOR gate with wide phase tolerance. The influence of clock optical power and input signal splitting ratio on the result of logic operation is studied. It is found that the unsynchronized change of input signal splitting ratio has an obvious influence on the output signal quality. Discussions were made on ways to increase program rates.