关于USB信号及其光纤传输电路分析

On USB Signal And the Analysis of Its Optical Fibre Transmission

对USB信号以及一种通过光纤传输USB(通用串行总线)信号的电路作了较详细的分析.此电路将USB信号D+,D-的三种状态转换为发射激光的三种强度全亮、半亮、暗,并且通过光纤传输到对方激光接收器,再通过相应电路恢复D+,D-的三种状态.激光接收器电路的输出信号之一触发单稳延时电路来控制D+,D-与激光发射电路、激光接收电路的通与断,以此实现USB信号的光纤传输.

This article introduces the USB signal and analyzes a kind of circuit which can transmit USB signals through fiber.In the circuit three states of the USB signal combined by D+、D-can be changed into different intensity of laser(bright,half bright and dark),which can thansmit through fiber to the receiver on the other end.The received laser then is revovered into the USB signals combined by D+,D-.Both D+、D-.and the on and off of the emitter and receiver are controled by monostable delay circuit which is trigg...