一种适于高速、多路通信系统的小色散单模光纤

Small Dispersion Single mode Fiber for High Speed, Multi channel Optical Transmission Systems

给出了色散系数分别为（±２ｐｓ／ｋｍ／ｎｍ的小色散单模光纤一种可能的折射率分布及主要的设计参数，并讨论了此光纤在系统中的应用。结果表明小色散单模光纤具有的适当色散，既可有效抑制四波混频，又不致造成严重的色散限制，故适于高速、多路光纤通信系统采用。在系统中同时使用色散补偿技术时，在相邻在线放大器间采用ＩＴＵ－ＴＧ．６５２常规单模光纤结合负小色散单模光纤的方案不仅可有效地抑制四波混频并减小光纤色散限制，使１０×１０Ｇｂ／ｓ、１０级掺铒光纤放大器系统占用带宽从１６．２ｎｍ压缩到９．４ｎｍ；甚至可能实现等间距信道传输。

Possible refractive index profiles and other major parameters of the small dispersion single mode fiber (SDSMF) with ±2 ps/km/nm dispersion are presented in this paper, and their applications are discussed. Results show that SDSMF is suitable for high speed, WDM+EDFA systems, both for its non zero dispersion to effectively suppress the four wave mixing (FWM) effect, and small dispersion to avoid severe dispersion induced degradation. When dispersion compensation is employed in the sequence of ITU T G.652 conventional single mode fiber (CSMF) and negative SDSMF between two adjacent in line amplifiers in a 10×10 Gb/s, 10 stage EDFA system, it offers the advantage of not only reducing the required system bandwidth from 16.2 nm to 9.4 nm at tolerable penalties caused by dispersion and FWM, but also making it possible for equal channel spacing transmission which significantly simplifies system design.