全光归零(RZ)到非归零(NRZ)码型转换技术研究进展

摘要

With the demand for higher bandwidth applications increasing,internet is growing at incredible rate. Future all-optical networks are likely to be a hybrid of wavelength division multiplexing(WDM) and optical time division multiplexing(OTDM) networks by combining the advantages of both technologies. All-optical RZ to NRZ code conversion, which can reduce any optical-electrical-optical conversion and enable of data with different format transmission in the optical domain through different region of network freely, is one of the key techniques of constructing this network. The research progress of all-optical RZ to NRZ format conversion is introduced. And the operation principle, characteristics, advantages and disadvantages of these methods are analyzed. Also the current difficulties of the techniques are listed. Finally, the future development is prospected.%随着多媒体网络服务业务类型的不断出现,人们对因特网带宽需求日益增长,未来的超高速大容量光子网络很可能是波分复用与时分复用相结合的智能网络.全光归零(RZ)到非归零(NRZ)的码型转换技术,是构建这种网络的关键技术之一,它能避免电子学器件的速率瓶颈,将时分复用(OTDM)与波分复用(WDM)有机结合,在光域内实现不同调制格式的数据在网络的不同部分之间自由传输,已经引起了越来越多人们的兴趣.介绍了当前全光归零到非归零码型转换技术的最新研究进展,分析了其工作原理,优缺点及性能参数,指出了目前存在的技术难点问题,最后对其发展前景进行了展望.