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互联网业务的迅猛增长,促使光网络向大容量高性能方向发展,波分复用(WDM)与时分复用(OTDM)相结合,将是未来超高速大容量光子网络的发展方向。全光非归零(NRZ)到归零(RZ)码型转换技术,是构建这种WDM/OTDM混合网络的核心接口技术之一,它能将分别采用WDM与OTDM技术的不同网络部分有机结合,实现不同调制格式的数据在网络的不同区域之间自由传输。综述了全光NRZ到RZ码型转换技术的最新研究进展,详细分析了每种方案的工作原理,性能特征及关键技术,对比了其优缺点,指出了目前存在的问题,最后对其发展前景进行了展望。
The rapid growth of Internet services has led to the development of optical networks towards large capacity and high performance. The combination of WDM and OTDM will be the development direction of high speed and high capacity photonic networks in the future. All-optical non-return to zero (NRZ) to return to zero (RZ) code conversion technology is one of the core interface technologies for constructing such a WDM / OTDM hybrid network, which can organically combine different network portions respectively adopting WDM and OTDM technologies , To achieve different modulation formats of data in different areas of the network free to transmit. The recent research progress of all-optical NRZ-to-RZ code conversion technology is reviewed. The working principle, performance characteristics and key technologies of each scheme are analyzed in detail. The advantages and disadvantages of each scheme are analyzed. The existing problems are pointed out. Finally, Prospects.