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第一代单模光纤传输系统设计用于长途大容量通信,其中继距离在40公里以上。此项技术如用于交换网,其局间和环路距离一般比可实现的最大中继距离短得多,因而有多余的光功率可以利用。本文讨论的激光共享方案用以减少系统的价格同时改善可靠性。 用于环路时,采用波分复用、外调制及偏振控制,可免去用户端设置的专用光源。 用于共用天线电视系统时,可用多路电视的调频复合信号来调制激光器电流,再发送至备有无源光分离器级联的许多用户。 本文提出的光功率共享方案在很大程度上类似直流环路动力装置。光功率的共享将使用户享用单模光纤具有的价廉和可靠的宽带服务。
The first generation of single-mode fiber optic transmission system designed for long-distance high-capacity communications, the relay distance of 40 km or more. This technique, for example, is used in switched networks where the inter-office and inter-loop distances are typically much shorter than the maximum achievable relay distance so that extra optical power is available. The laser sharing scheme discussed in this article is intended to reduce system costs while improving reliability. For loop, the use of wavelength division multiplexing, external modulation and polarization control, eliminating the need for the client to set the special light source. When used in a common antenna TV system, the multiplexer’s signal can be modulated with the multiplexed TV multiplexed signal to be sent to many users with a passive optical splitter cascade. The optical power sharing scheme proposed in this paper is largely similar to a DC loop power unit. The sharing of optical power will allow users to enjoy the cheap and reliable broadband services that single-mode fiber has.