大容量光传输技术进展与400G C+L系统研究

Research progress of large-capacity optical transmission technologies and investigation on 400G C+L band system

分析了长距光传输系统容量提升的三大途径,围绕单波超400G、波段扩展及空分复用三大技术热点介绍其研究进展及标准化动态,对比空分复用和波段扩展的应用前景;之后,针对波段扩展系统开展单波400G C+L实时传输试验研究,验证了功率均衡对功率平坦度和传输代价的改善效果。研究表明,相比于空分复用,短期内C+L波段扩展应用更具实用价值;对于400G C+L传输系统,功率均衡可改善系统的OSNR瓶颈,并控制L波段的非线性代价。

Firstly,three ways to improve the capacity of long-haul optical transmission system are analyzed,and then the research progress and standardization trends of the 3 technical hot-spots are introduced including long-haul 400G,multi-band transmission with wave-band extension and space division multiplexing(SDM).After that the application prospects of SDM and multi-band transmission technologies.Finally,a 400Gbit/s per wavelength real-time transmission experiment over C+L band is carried out to verify the improvement of channel power flatness and transmission penalty brought by optical channel power equalization technique.The research shows that compared with SDM,C+L band expansion is more practical for commercial deployment in the short term.For C+L band 400G transmission system,power equalization can improve the OSNR bottleneck of the system and reduce the nonlinear penalty of L band.