摘要
采用单纤双向系统是实现光纤通信系统扩容的有效解决方案。文章提出了采用波长移位技术降低单纤双向传输系统中的反向瑞利散射的方案,并介绍了采用OptiSystem仿真软件搭建的基于QPSK(正交相移键控)调制方式的双向传输系统仿真模型。仿真结果表明:在最优发射功率为3dBm、传输距离为360km的情况下,双向传输系统比传统的单向传输系统Q值提高了1.5倍,误码率降低到10-170,同时,满足Q>6的最大传输距离可达1 600km。研究表明,单纤双向系统在传输容量相同的情况下,较之于传统单纤单向系统可以少用一根光纤,其传输性能也有所提升。
Using a single-fiber bidirectional system is an effective solution to the capacity expansion of the fiber-optic communi-cation system and the simulation study of its performances is important to its practical applications.This paper presents an ef-fective scheme,i.e.using the wavelength shifting technology to lower the reverse Rayleigh scattering in the system and using OptiSystem to set up a simulation model for the QPSK modulation-based bidirectional transmission system.When the trans-mitting power is 3 dBm and the transmission distance is 360 km,the Q factor of the proposed system is improved by 1.5 times and the BER is reduced to 10-170 as compared with the traditional unidirectional WDM system.In addition,when the Q factor is over 6,the maximum transmission distance can reach 1 600 km.Research results show that when the transmission capacity is the same,the bidirectional system can reduce the use of one fiber and its transmission performance is also somewhat im-proved.
出处
《光通信研究》
北大核心
2014年第3期48-51,共4页
Study on Optical Communications
关键词
正交相移键控
波长移位
双向传输
QPSK
wavelength shifting
bidirectional transmission
