Neokosmidis Ioannis, Kamalakis Thomas, Chipouras Aristides, Sphicopoulos Thomas
Department of Informatics and Telecommunications, University of Athens, Panepistimiopolis Ilissia, Athens GR-15784, Greece.
Appl Opt. 2004 Sep 10;43(26):5023-32. doi: 10.1364/ao.43.005023.
Fiber nonlinearities can degrade the performance of a wavelength-division multiplexing optical network. For high input power, a low chromatic dispersion coefficient, or low channel spacing, the most severe penalties are due to four-wave mixing (FWM). To compute the bit-error rate that is due to FWM noise, one must evaluate accurately the probability-density functions (pdf) of both the space and the mark states. An accurate evaluation of the pdf of the FWM noise in the space state is given, for the first time to the authors' knowledge, by use of Monte Carlo simulations. Additionally, it is shown that the pdf in the mark state is not symmetric as had been assumed in previous studies. Diagrams are presented that permit estimation of the pdf, given the number of channels in the system. The accuracy of the previous models is also investigated, and finally the results of this study are used to estimate the power limits of a wavelength-division multiplexing system.
光纤非线性会降低波分复用光网络的性能。对于高输入功率、低色散系数或低信道间隔，最严重的代价是由四波混频（FWM）造成的。为了计算由FWM噪声导致的误码率，必须准确评估空态和传号态的概率密度函数（pdf）。据作者所知，首次通过蒙特卡罗模拟给出了对空态中FWM噪声pdf的准确评估。此外，研究表明传号态中的pdf并不像先前研究所假设的那样对称。给出了一些图表，可根据系统中的信道数量估算pdf。还研究了先前模型的准确性，最后利用本研究结果估算了波分复用系统的功率限制。
