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Optical transceiver - the system principle you don't know
The optical transceiver is the terminal device for optical signal transmission. Due to the improvement of the current technology, the reduction of the price of optical fiber has made it a good application in various fields (mainly in security monitoring), so the manufacturers of optical transceivers are like mushrooming.
The optical transmission system consists of three parts: a light source (optical transmitter), a transmission medium, and a detector (optical receiver). Divided by transmission signal, it can be divided into digital transmission system and analog transmission system.
In an analog transmission system, the input signal is changed to a continuous change in amplitude (frequency or phase) of the transmission signal. The analog transmission system of optical fiber is analog modulation of the light intensity, and the modulation power of the light source changes with the amplitude of the modulation signal. However, due to the serious nonlinearity of the light source, its signal-to-noise ratio, transmission distance and transmission frequency are very limited.
The digital transmission system converts the input signal into a pulse signal represented by "1", "0", and uses it as a transmission signal. At the receiving end, restore it to the original information. In this way, the nonlinearity of the light source has little influence on the digital code stream. In addition, digital communication can adopt some methods of coding error correction, and it is easy to implement multiplexing. Therefore, the digital transmission system has great advantages and is obtained in many places. A wide range of applications.