一九八二年十月底,西德联邦邮局已使用了一条波长范围为 880nm的光纤线路。能够达到如此波长范围是由于采用了西门子公司研制的一种新的激光二极管。光纤的典型衰减每公里大约0.5分贝,比在至今通用 850nm波长时还要低,因此可使距离延长。这是西门子公司在最近四年内为西德联邦邮局研制的第六根光纤,从而使其总长度长达约400公里。这条新的线路位于慕尼黑 F rstenfeldbruck总交换台和 Olching地方交换台之间。在一条长 By the end of October 1982, a post-880nm fiber line had been used in the post office in the West Germany. To achieve such a wavelength range is due to the use of a new laser diode developed by Siemens. The typical attenuation of optical fiber is about 0.5 dB per kilometer, which is lower than that of 850 nm wavelength so far, so the distance can be extended. This is the sixth fiber that Siemens has developed for the post office of the Federal Register in the last four years, bringing the total length to about 400 km. This new line is located between Munich’s F rstenfeldbruck Main Exchange Station and the Olching Regional Exchange Station. In a long