Water-land optical communication network architecture and communication method based on interconnection between underwater visible light communication network units (UVNU) and fiber

Abstract

The invention discloses a water-land optical communication network architecture and a communication method based on interconnection between underwater visible light communication network units (UVNU) and a fiber. The communication network architecture comprises an optical line terminal (OLT), a separator/coupler, the UVNUs and underwater users, wherein the OLT is connected with a core network and arranged on the land; and the separator/coupler, the UVNUs and the underwater users are all arranged underwater. The communication method comprises steps: the network is firstly initialized, and data collected by a certain underwater user are transmitted to the connected UVNU in an uplink mode and then transmitted to the OLT; if the OLT recognizes the destination address to be the land terminal, the data are transmitted to the core network; or otherwise, the OLT adds the identification code of the UVNU at the destination address to a data frame, and the data frame is broadcasted to the UVNU; the UVNU judges whether the identification code is the same as that of the UVNU itself, and if not, discarding is carried out, or otherwise, the UVNU broadcasts the data frame with the identification code of the destination underwater user to the underwater user; and finally, the underwater user judges whether the identification code is the same as that of the underwater user himself or herself, if yes, the data are demodulated, or otherwise, the data are discarded.

Description

technical field [0001] The invention belongs to the field of optical communication, in particular to an amphibious optical communication network framework and a communication method based on the interconnection of underwater visible light communication network units and optical fibers. Background technique [0002] With the continuous development of underwater applications, people have put forward higher requirements for the capacity of underwater transmission links. [0003] At present, acoustic communication technology is the most widely used underwater communication technology, with an acoustic propagation rate of 1500m / s and a large transmission delay. Using acoustic communication technology, data can be transmitted for several kilometers or even tens of kilometers, and the transmission capacity is tens to hundreds of kHz. However, acoustic communication technology cannot satisfy the transmission of large-bandwidth underwater signals; and the very mature radio frequency...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the short communication distance of the underwater VLC, the large bandwidth data cannot be transmitted to the underwater long-distance collaborative work node and the water terminal for real-time processing, and the diffic...

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