一、引言就光纤通信现状而言,在国外业已形成一个光纤通信产业,到1980年为止从事光纤通信的厂商约有378家,服务内容有23个门类,产品销售额在1982年已占通信市场的第二位,从而使光纤通信从小规模试验的初期阶段进入了大规模发展阶段,在技术上,多模、长波的器件、光缆及中小容量,中距离系统都已进入实用阶段,少数国家已将高速率光纤系统用于干线通信;单模长波长光纤系统正在试验中。相比之下,我国色1976年开展光纤通信研究以 I. INTRODUCTION As far as the status quo of optical fiber communications is concerned, an optical fiber communication industry has been formed in foreign countries. By 1980, there were about 378 optical fiber communication manufacturers and 23 service categories. The sales volume of the products accounted for the telecommunication market in 1982 The second place, so that the optical communications from the initial stage of small-scale test into a large-scale development stage, technically, multi-mode, long wave devices, fiber optic cable and small and medium-capacity systems have entered a practical phase, a few countries have High-speed fiber systems for trunk communications; single-mode long-wavelength fiber systems are under test. In contrast, China’s color fiber communication in 1976 to study