中国激光, 2014, 41 (s1): s105003, 网络出版: 2014-07-03  

信号噪声对微纳波导中四波混频效应的影响分析

Analyses of Noise on the Four-Wave-Mixing Effect in Micro-Nano Waveguides
作者单位
西南交通大学信息光子与通信研究中心, 四川 成都 610031
摘要
基于微纳波导中的四波混频效应(FWM)可以实现相应的光逻辑功能,研究了在这类非线性波导中,信号噪声对四波混频效应的影响。针对通信系统中常见的高斯噪声,具体分析了在金属-介质-金属(MIM)结构的波导中,输入信号光分别受到幅度噪声、频率噪声、相位噪声以及加性噪声影响之后对四波混频效应的各种影响。结果表明,在相位噪声的平均功率增大到1.44以上时,基于四波混频所产生闲频光的归一化强度小于-40 dB,远低于无噪声时的-18 dB,非线性效率出现较大降低;而当信号光受其他噪声影响时,四波混频产生闲频光的强度与无噪声时基本相同。由此可得,四波混频对相位噪声比较敏感,而其他类型的噪声对四波混频无明显影响。
Abstract
Optical logics can be achieved by utilizing four-wave-mixing (FWM) effects in micro-nano waveguides. We analyze the contributions of signal noise onto the efficiency of FWM in such nonlinear waveguides. Since Gaussian noise exists extensively in most practical systems, we analyze the FWM process of the input signals, which are affected by amplitude noise, frequency noise, phase noise and additive noise in the metal-insulator-metal (MIM) waveguides. Results show that, with the average power of the phase noise increasing over 1.44, the normalization intensity of the idle light generated in the FWM process is less than -40 dB, compared to -18 dB without noise, indicating a significantly reduction of nonlinear efficiency. However, if the signals are affected by other kinds of noise, the intensity of the idle light is nearly the same as that without noise. Therefore, FWM process in such waveguides is sensitive to Gaussian phase noise, while it′s not sensitive to other kinds of noise.

张先涛, 闫连山, 郭迎辉, 王鲁俊, 潘炜, 罗斌. 信号噪声对微纳波导中四波混频效应的影响分析[J]. 中国激光, 2014, 41(s1): s105003. Zhang Xiantao, Yan Lianshan, Guo Yinghui, Wang Lujun, Pan Wei, Luo Bin. Analyses of Noise on the Four-Wave-Mixing Effect in Micro-Nano Waveguides[J]. Chinese Journal of Lasers, 2014, 41(s1): s105003.

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