Optical mm wave generating and wavelength reuse method and system in all-duplex communication radio Over-Fiber

Abstract

This invention discloses a method and a system for generating and re-using full light millimeter waves of full duplex communication and re-using wave lengths in the Radio-on-Fiber ROF communication system, which applies a carier suppression method by double pole modulator and filters by an optical filter to separate two vertical modes of a carrier suppression signal, one of which is modulated in its baseband signals and couples to the other one un-modulated to generate optical millimeter waves to simplify, stabilize the structure of the central station at low cost, and an optical filter is used in the base station to filter out the vertical mode with un-modulated signals as the optical carrier of up link and realizes repeatedly using the wavelength in down-link in the up link so that light source is not used any more in the base station and the structure is simple and cost, besides, a ROF system is provided for realizing generating light millimeter waves and re-using up link wavelength.

Description

(1) Technical field [0001] The invention belongs to the technical field of optical fiber-wireless communication (Radio-over-Fiber, abbreviated as ROF) communication system. (2) Background technology [0002] At present, radio spectrum resources are very tight, and the frequencies suitable for wireless mobile networks have actually been divided. It is becoming more and more difficult to further develop other wireless new technologies and enhance the spectrum of existing technologies. However, our demand for information is constantly increasing, and the existing Wireless technology is difficult to meet people's requirements for bandwidth. The fourth-generation wireless access system will extend to the millimeter wave band. Optical fiber-wireless system (Radio-Over-Fiber, ROF for short) will become the most promising technology for solving broadband wireless access. The ROF system makes full use of the huge bandwidth of optical fibers to reduce costs and combines the flexibil...

AI Technical Summary

Problems solved by technology

[0007] For the generation of optical millimeters mentioned above and the wavelength reuse of the uplink, the existing technical solution is to use double sideband modulation [A.Kaszubowska, L.Hu, L.P.Barry, "RemoteDownconversion with wavelength reuse for the radio / fiber uplinkconnection" IEEE Photonics Technology Letters, Vol.18, No.4, 2006, Page(s): 562-564.], however, it did not solve the signal attenuation effect caused by double sideband modulation, and the final transmission distance was very short ( Only up to 12 kilometers) and the transmission signal rate is low (only up to 150Mb / s)

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