收发机噪声对非线性补偿光纤通信系统的影响

Influence of Transceiver Noise on Nonlinearity-Compensated Optical Transmission Systems

近年发展起来的数字后向传输(DBP)算法能够明显地消除相干光纤通信系统中的非线性损伤。然而,作为一类固有的噪声源,光收发机噪声和光信号会在光纤的传输过程中经由光纤克尔效应发生有害的非线性信号-噪声间相互作用(NSNI)。NSNI效应会显著降低DBP算法的有效性。针对三类传输光纤(纯石英光纤、单模光纤和非零色散位移光纤),研究了奈奎斯特-波分复用相干光传输系统中,收发机噪声引起的光纤通信系统的传输代价。结果表明,尽管纯石英光纤在无收发机噪声影响的情况下表现出最好的通信性能,但是它对收发机噪声的影响最为敏感。

In recent years,the developed digital back-propagation(DBP) algorithm can mitigate the fiber nonlinearities significantly.However,as a noise source,the transceiver noise will remarkably degrade the effectiveness of DBP algorithm.In this paper,we investigate the transmission penalty induced by the transceiver noise in Nyquist-spaced coherent optical transmission systems over different fiber types.We show that although the pure silica core fiber exhibits the best performance without transceiver noise,it is most sensitive to the transceiver noise.