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，从而大大简化了此类系统的设计 The possible refractive index distribution and the main design parameters of small dispersion single mode fiber with (± 2ps / km / nm) dispersion coefficients are given respectively and the application of the fiber in the system is discussed.The results show that the small dispersion single mode The appropriate dispersion of optical fiber, can effectively inhibit the four-wave mixing, without causing serious dispersion restrictions, it is suitable for high-speed, multi-fiber optical communication system used in the system using the dispersion compensation technology, the adjacent in-line amplifier The scheme of using ITU-TG.652 conventional single-mode optical fiber combined with negative dispersion single-mode optical fiber not only can effectively suppress the four-wave mixing and reduce the dispersion limit of the optical fiber, but also can make the 10 × 10Gb / s, 10-level erbium-doped fiber amplifier system The occupied bandwidth is compressed from 16.2nm to 9.4nm; it is even possible to achieve equally spaced channel transmission, which greatly simplifies the design of such systems