Research On Generation Of Single Side Band Signal Based On Stimulated Brillouin Scattering Effect

Transmission of radio signals over optical fibers has long been recognized as anefficient method of RF signal distribution over longer distances. The main advantageof Radio-over-fiber systems is that implementation of conversion between themicrowave and optical realizes the RF band-pass transmission without attenuation andmutual interference between the channels, combining the advantages of microwavecommunications and light. Utilizing single sideband modulation technologyeliminates dispersive effects of microwave on high-frequency signal transmission.The paper introduces several scheme to achieve a variety of single sideband signal，using stimulated Brillouin scattering effect. First, the article describes basicinformation of radio-over-fiber system, as well as advantages and disadvantages ofsingle sideband modulation signal generation. The basic principles to generate singlesideband signals are advised，including stimulated Brillouin scattering effect andMach-Zehnder Modulator, and these principles has been analyzed and verified byexperiments, especially power, frequency shift and threshold of stimulated Brillouinscattering effect, for inducting our schemes. The main work of this paper is to proposethe scheme to generate about10GHz single side band signal based on stimulatedBrillouin scattering effect. The schemes are able to increase or decrease the upper orthe lower side band, changing the side-band balance of the carrier wave. It is alsoilluminated that making full use of Mach-Zehnder Modulator achieve twice frequencyof the local microwave oscillation, about21GHz SSB signal. The power andpolarization of pump light are discussed to the generation of SSB signal. Further, thepaper results in better21GHz single sideband modulation signals, using doubleBrillouin scattering. By use of tunable distributed feedback lasers, generation of anyfrequency signal single sideband modulation is achieved. Finally, based on doublestimulated Brillouin amplification and tunable microwave source, the paper bringsabout a scheme to generation tunable millimeter wave signal.