Optical fiber communication system based on free space

Abstract

The invention discloses an optical fiber communication system based on a free space, mainly relating to optical communication. The optical fiber communication system comprises an optical fiber, a laser, a signal source, an arbitrary waveform generator, a first spatial light modulator, a circulator, a second spatial light modulator, a pump light source, a signal transmission optical fiber, an erbium-doped optical fiber amplifier, a photoelectric detector, a data acquisition card, a computer and four optical fiber collimators, wherein the signal source controls the first spatial light modulatorto load an electric signal to be transmitted on signal light through the arbitrary waveform generator, and the arbitrary waveform generator adjusts the frequency difference between the pump light frequency of the pump light source and the signal light frequency to a Brillouin frequency shift through the second spatial light modulator. Thereby, the signal light can be subjected to Brillouin amplification, an amplification mechanism is high in gain coefficient, high in pump efficiency and low in required pump power, and moreover, the combination of the spatial light modulators and the optical fiber collimators is more suitable for high-speed optical communication systems.

Description

technical field [0001] The invention relates to optical communication, in particular to a fiber optic communication system based on free space. Background technique [0002] Standing out from optical communication, optical fiber communication technology has become one of the main pillars of modern communication and plays a pivotal role in modern telecommunication networks. As an emerging technology, optical fiber communication has been developing rapidly and widely used in recent years, which is rare in the history of communication. It is also an important symbol of the world's new technology revolution and the main transmission tool for various information in the future information society. [0003] However, in the current optical fiber communication system, Raman amplification is generally used for optical signal amplification. Due to the low gain coefficient of Raman amplification, low pumping efficiency, and high pumping power, the optical fiber connector and optoelectro...

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Problems solved by technology

[0003] However, in the current optical fiber communication system, Raman amplification is generally used for optical signal amplification. Due to the low gain coefficient of Raman amplification, low pumping efficiency, and high pumping power, the optical fiber connector and optoelectronic devices are easily burned out, and the cost is expensive. , in summary, it is not suitable for LAN optical fiber communication or small-scale optical fiber communication system

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