MOPA underwater wireless optical communication transmitting device based on Manchester coded signals

Abstract

The invention discloses an MOPA underwater wireless optical communication transmitting device based on Manchester coded signals. The device comprises a signal processor for generating Manchester codedsignals, wherein the signal processor is connected with an amplifier and an attenuator, the attenuator is connected with the bias driver, the bias driver drives a laser diode, optical signals generated by the laser diode are focused by a first convex lens and then coupled into an optical fiber isolator, the optical fiber isolator is connected with a pump beam combiner, the input end of the pump beam combiner is further connected with a pump laser, light emitted by the output end of the optical fiber isolator and pump light emitted by the pump laser are combined together through the pump beamcombiner and then enter a doped optical fiber, and the doped optical fiber is connected with a second convex lens, a third convex lens, a frequency doubling KTP crystal and a fourth convex lens. According to the invention, high power output can be realized, the complexity of a high-speed communication system is reduced, and the communication rate of signals is improved.

Description

technical field [0001] The invention belongs to the technical field of underwater wireless optical communication, in particular to a MOPA underwater wireless optical communication transmitting device based on Manchester encoded signals. Background technique [0002] Compared with traditional acoustic communication technology, optical communication technology can overcome the disadvantages of underwater acoustic communication, such as narrow bandwidth, great environmental influence, low applicable carrier frequency, and long transmission delay. Therefore, underwater wireless optical communication will play an important role in the fields of ocean detection, ocean environment monitoring, and ocean resource development. [0003] Underwater wireless optical communication (UWOC for short) is a communication method that uses blue-green light as the communication carrier and water as the communication medium for underwater information exchange. [0004] At present, most underwater...

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Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, the present invention provides a MOPA underwater wireless optical communication transmitting device based on Manchester coded signals. The combination of lasers and frequency doubling crystals can use lower power 1um laser diodes to achieve higher power output and reduce the complexity of high-speed communication systems, and the present invention uses continuous optical output and Manchester coded signal communication, Can make full use of the bandwidth of the laser to increase the communication rate of the signal

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