Polarization multiplexing-based full duplex wired-wireless hybrid optical access system and method

Abstract

The invention discloses a polarization multiplexing-based full duplex wired-wireless hybrid optical access system and method. The system comprises a central station, an optical fiber transmission link, a hybrid ONU (Optical Network Unit) and a wireless user terminal, wherein the optical fiber transmission link is arranged between the central station and the hybrid ONU. The full duplex transmissionof down link and up link broadband signals is realized, a full duplex optical link is formed, the complexity of the central station is reduced, the spectrum utilization efficiency is improved, and long-distance transmission of high-rate broadband signals is realized; the hybrid ONU flexibly and conveniently provides wired or millimeter wave wireless selective access according to different requirements of users, and the flexibility of the access manner of the hybrid ONU is increased; coherent demodulation local oscillator light of an uplink optical signal is reserved in the central station, the complexity of the central station is simplified, and the realizability of the full duplex link is improved; and the hybrid only needs a continuous laser source CWLD2 with a fixed output wavelength,heterodyne beat local oscillator light in wireless access with the downlink optical signal is provided, uplink optical carriers are wirelessly accessed, and the cost of the hybrid ONU is reduced.

Description

technical field [0001] The present invention relates to the technical field of optical fiber wired access communication and millimeter wave wireless access communication, in particular to a full-duplex wired and wireless hybrid optical access system and method based on polarization multiplexing. Background technique [0002] With the advent of the high-speed information age, new ultra-broadband multimedia services such as video education, telemedicine, online games, 3D display, and ultra-high-definition / blue-ray TV continue to emerge, as well as online shopping, mobile phone The rapid development of Apps such as banking, live video, handheld health, shared bicycles, and cloud services has made human society's demand for access network transmission bandwidth increase at an alarming rate. Capacity presents a serious challenge. At the same time, with the introduction of the concept of smart cities and the rapid construction of smart cities, people hope that they can be connect...

AI Technical Summary

Problems solved by technology

However, at least the following problems still exist in the reported PON / RoF-based wired and wireless hybrid optical access network: simply superimposing the spectrum carrying the optical wave of the wired access signal and the spectrum carrying the optical wave of the wireless access signal, the wired and wireless The access channel is still two independent channels, and there are problems such as complex converged network structure, low degree of network convergence, and waste of network resources. In addition, at the network access terminal, the services provided by wired and wireless access are different. The problem of fixed access mode

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