Distributed type optical fiber acoustic wave communication method and device

Abstract

The invention discloses a distributed type optical fiber acoustic wave communication method and device and relates to the field of optical fiber communications. Firstly, acoustic waves with information are emitted and transmitted to a communication optical cable, so that Rayleigh scattering of transmission signal light in the communication optical cable changes, the emitted acoustic waves are demodulated and restored by detecting changes of Rayleigh scattering through a distributed type optical fiber acoustic wave communication mainframe, and the purpose of the distributed type optical fiber acoustic wave communication method and device are achieved. The complete passive feature, distributed communication feature and accurate acoustic source positioning feature are achieved; the effects of achieving extra-long distance communication without interruption, freely switching analog transmission and digital transmission and not needing to adjust hardware equipment are achieved; meanwhile, as the acoustic wave information source can be either an analog acoustic source or a digital acoustic source, the distributed type optical fiber acoustic wave communication system can achieve direct acoustic wave communication and digital communication.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a method and device for realizing a distributed optical fiber acoustic wave communication system. Background technique [0002] At present, the distributed acoustic wave detection system has become one of the most popular optical fiber sensing technologies. The distributed acoustic wave detection system periodically injects optical pulses into the optical fiber. Through high-sensitivity optical detection and optical phase demodulation technology, the phase information of Rayleigh scattered light can be demodulated in real time, so that it can linearly demodulate the disturbance to the optical cable caused by the outside world. Because it is sensitive enough, and the sensitivity can reach several nε, it can effectively detect the strain imposed by the sound wave on the optical cable, so that it can effectively restore the sound field information. This technology has bee...

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Problems solved by technology

For example, because electromagnetic waves attenuate quickly in solids and water, wireless communication cannot work normally in occasions such as underwater and closed underground tunnels; traditional optical fiber communication requires optical transmitters and receivers, and after more complex deployment , can only achieve point-to-point communication, but in the middle of the optical fiber link, it is impossible to directly upload information

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