Dual-wavelength underwater wireless optical communication method and system

Abstract

The invention belongs to the field of underwater wireless optical communication, and relates to a dual-wavelength underwater wireless optical communication method and system. The method comprises the following steps: controlling an emission system to combine two beams of light with different wavelengths to form an optical signal A; converting the optical signal A into an optical signal B with a divergence angle theta, and sending the optical signal B to a receiving end through a channel; controlling a receiving system to divide the received optical signal B into two beams, so that one beam of optical signal is processed into an electric signal C1 through filtering and photoelectric conversion, the other beam of the optical signal is processed into an electric signal C2 through filtering, photoelectric conversion and smooth filtering; and subjecting the electric signal C1 and the electric signal C2 to light intensity compensation processing through a data processing module so as to output an electric signal out; and demodulating and decoding the electric signal out to finally obtain an original signal. Compared with the existing space diversity technology, the system uses the same optical receiving module to receive light intensity, is only composed of two photoelectric detection circuits, and is small in size, low in cost and more compact in overall structure.

Description

technical field [0001] The invention belongs to the technical field of wireless optical communication, and relates to a dual-wavelength underwater wireless optical communication method and system. Background technique [0002] Underwater wireless information transmission plays an important role in military activities, pollution detection, oil control, climate change monitoring, and oceanographic research, and has attracted extensive attention from military, industrial, and scientific circles. Compared with traditional underwater acoustic communication, underwater wireless optical communication has the advantages of high bandwidth, low power consumption, and anti-interference, so it has gradually attracted people's attention. [0003] Ocean turbulence is one of the main factors affecting the transmission performance of underwater wireless optical communication systems. Ocean turbulence occurs because seawater is affected by random fluctuations in the refractive index caused ...

AI Technical Summary

Problems solved by technology

After the optical signal passes through the ocean turbulent channel, it will cause the light intensity at the receiving end to flicker, causing the dynamic time-varying effect of the received power, thereby deteriorating the communication quality of the underwater wireless optical communication system

In response to the above problems, researchers proposed space diversity technology to alleviate the impact of ocean turbulence on underwater wireless optical communication systems, and space diversity technology is to alleviate the impact of ocean turbulence on underwater wireless optical communication systems by using multiple receivers with a certain space interval. Communication performance, but its cost is high and bulky

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