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1983年12月,日本电报电话公司(NTT)开始安装一条新的F-400M光纤传输系统。F-400M是一种数字传输系统,其传输速率为400兆比特/秒。该系统利用光纤通信技术,适用于长途和大容量的干线。新系统的一个重要特征是光损耗低,这是由于使用了VAD工艺的结果。该系统中的光器件包括长寿命InGaAsP激光二极管和锗雪崩光电二极管。激光二极管是在单模控制条件下发生光激射的,以便于同单模光纤的光耦合。这些二极管的寿命超过十万小时,即可工作11年。
In December 1983, NTT began installing a new F-400M fiber optic transmission system. The F-400M is a digital transmission system with a transmission rate of 400 megabits per second. The system uses optical fiber communication technology, suitable for long-distance and high-capacity trunk. An important feature of the new system is the low optical loss due to the use of the VAD process. The optical devices in this system include long-life InGaAsP laser diodes and germanium avalanche photodiodes. Laser diodes are photoexcited under single mode control to facilitate optical coupling with single mode fibers. The life of these diodes more than one hundred thousand hours, you can work for 11 years.