Optical fiber radio communication system

Abstract

The invention relates to an optical fiber radio communication system, in particular to a quadruple-frequency dual-millimeter wave optical fiber radio communication system. The optical fiber radio communication system uses a Mach-Zehnder modulator to apply local oscillator signals to the suppressed carrier modulation of optical signals so as to generate first-order sidebands and third-order sidebands, and uses an optical interleaving multiplexer to separate four sidebands into two groups so as to form a sideband module of which the frequency difference is four times that of the local oscillator signals. An optical filter filters out single sidebands in the two groups of the sidebands respectively and the single sidebands are loaded with data, and then a four-port optical coupler is used for equalizing the frequency of the four sidebands and transmitting the frequency to a base station. The optical fiber radio communication system uses the optical interleaving multiplexer in the base station to divide signals into two groups and generate quadruple-frequency electric millimeter waves through optical detector beat frequency, so the frequency of a local oscillation signal source can bereduced, and double quadruple-frequency optical millimeter wave signals can be generated by adopting an optical modulator. Besides, the optical fiber radio communication system loads data unilaterally to reduce error code crosstalk, increase the signal bandwidth and improve the system performance, and saves the system manufacturing cost on the basis of improving the frequency spectrum utilizationratio.

Description

technical field [0001] The present invention is an optical fiber wireless communication system, in particular a quadruple frequency double millimeter wave optical fiber wireless communication system. It belongs to the innovative technology of optical fiber wireless communication system. Background technique [0002] The communication frequency adopted by the next-generation ultra-wideband wireless communication technology in the future will extend to the millimeter wave band, and the broadband requirement in wireless communication must utilize the existing optical fiber communication technology. Therefore, a radio-over-fiber system (RoF system for short) will become the most promising technology for solving next-generation ultra-broadband wireless access. The RoF system includes a central station, optical fiber links and base stations. The central station generates optical millimeter waves and sends them to the base station via optical fiber. The base station only contain...

AI Technical Summary

Problems solved by technology

For the generation method of double-frequency optical millimeter wave, if high frequency millimeter wave is to be generated, it is necessary to use a high frequency local oscillation signal source, thus increasing the cost of the optical fiber wireless communication system

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