Author:
Cao Ya-Min ,Wu Bao-Jian ,Wan Feng ,Qiu Kun ,
Abstract
The existing theoretical equations cannot provide an excellent guidance for developing four-wave mixing (FWM)-based optical logic devices, though the experiments have been done in several researches. The optimization of noise figure performances of such devices should be further investigated. In the paper, the universal analytic expressions for the amplitude and phase of the idler in degenerate or non-degenerate FWM process under pump depletion are derived in detail from the nonlinear coupled-mode equations for guiding optical waves propagation in highly nonlinear fiber. The universal analytic expressions are obtained by the first-and the third-kind of elliptic integrals. By using equivalent infinitesimal to calculate the limit of phase sensitive amplification, we find out the initial phase relationship between the idler and the input guided wave for phase-independent amplification, which is crucially important for explaining the operating principles of the FWM-based adder and subtracter. As an example, the configuration of non-degenerate FWM-based hybrid arithmetic device with three logic functions of A+B-C, A+C-B, and B+C-A for QPSK signals is presented, and then the noise transfer characteristics in terms of signal-to-noise ratio (SNR) and error vector magnitude (EVM) are taken into account by adjusting the fiber length, input wavelength, and optical power. The calculation results show as follows. 1) This kind of arithmetic device has a noise figure of about 1.1 dB and an input SNR of more than 24 dB is necessary for the symbol error rate of 10-3 without forward error correction, corresponding to an output EVM of 23.2%. 2) The length of highly nonlinear fiber used in the hybrid arithmetic device may be taken flexibly, provided that the variation of FWM conversion efficiency is controlled in a range of 1 dB relative to the maximum, with an EVM fluctuation of less than for the idlers. 3) The hybrid arithmetic device has an operating optical bandwidth of about 16 nm for the SNR degradation of 1.3 dB. 4) The output EVM increases with the increase of input power, and the allowable input power should be no more than 100 mW for an input SNR of 28 dB, noting that the larger the input SNR, the higher the allowable input power is.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy
Reference29 articles.
1. Wang J, Yang J Y, Huang H, Willner A E 2013 Opt. Express 21 488
2. Azeemuddin S, Chaitanya G V, Sayeh M R 2012 J. Opt. 41 142
3. Wang W R, Yu J L, Han B C, Guo J Z, Luo J, Wang J, Liu Y, Yang E Z 2012 Acta Phys. Sin. 8 084214 (in Chinese) [王文睿, 于晋龙, 韩丙辰, 郭精忠, 罗俊, 王菊, 刘毅, 杨恩泽 2012 物理学报 8 084214]
4. Wang A D, Hu X, Zhu L, Zeng M Q, Fu L, Wang J 2015 Opt. Express 23 31728
5. Yan S L 2013 Acta Phys. Sin. 62 230504 (in Chinese) [颜森林 2013 物理学报 62 230504]
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献