Integral wired-wireless optical fiber asymmetric full-duplex access method and system

Abstract

The invention discloses an integral wired-wireless optical fiber asymmetric full-duplex access method and system. A light with the frequency being f0 is divided into two beams; one beam is modulated by a high-speed QAM (Quadrature Amplitude Modulation) millimeter-wave signal single side band with the frequency being fRF to generate a light carrier OLO1 (Optical Line Output 1) and a signal side band BBD with same polarization; and the other beam is inhibited and modulated by a local oscillator carrier with the frequency being fRF to generate an OLO2 with the same frequency as the BBD, after the OLO2 is orthogonal and combined with the OLO1, excess optical frequency components are filtered, and a downward infusion optical signal is generated. The infusion optical signal is transmitted to a base station through optical fiber, and can provide wired or wireless access. When the base station is accessed in a wired manner, a wavelength interpolation device separates the OLO2, the BBD from the OLO1, the OLO2 is subjected to coherent demodulation so as to obtain a downlink baseband signal, and the OLO1 carries an uplink low-speed signal and is back to a central station through the optical fiber; and when the base station is wirelessly accessed, a polarization beam splitter separates the OLO1, the BBD and the OLO2, the OLO1 is an optical millimeter-wave signal and is converted to electrical millimeter-wave through a photoelectric detector, and the OLO2 carries an uplink low-speed millimeter-wave signal and is back to the central station through the optical fiber, so that wired or wireless asymmetric full-duplex access is realized.

Description

technical field [0001] The present invention relates to the field of optical communication and millimeter-wave wireless access communication, and in particular to a hybrid access method and method for long-distance transmission of integrated optical signals based on PON wired / ROF wireless by using optical communication technology to realize full-duplex wired / wireless integrated signals. system. Background technique [0002] Radio-over-Fiber (RoF) technology combines the characteristics of optical fiber communication and wireless communication. It not only has the advantages of large bandwidth, low loss, anti-electromagnetic interference, and long-distance transmission of optical fiber communication, but also has wireless communication. The flexible access feature limited by geographical location provides end users with large capacity, high data transmission rate and convenient and flexible access mode. The passive optical network (Passive Optical Networks, PON) based on opt...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low utilization of frequency band resources in the above-mentioned wired / wireless hybrid access network and the separation of wired and wireless equipment in the hybrid access network, which makes the system extremely complicated, the present invention proposes a new wired and wireless integrated optical fiber asymmetric Duplex access method and system

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