Study On Temperature And Optical-controllable Properties Of Graphene Coating EFBG

As one kind of excellent optical fiber devices,Fiber Bragg Grating(FBG)has been widely used in many fields such as optical fiber sensing and optical fiber communication since its birth.Because the optical signal in FBG is a very narrow linewidth wavelength signal,the measurement of the signal can overcome the interference of the fluctuation of the light source.At the same time,it has the advantages of low loss,easy reuse and anti electromagnetic interference.Graphene has a unique band structure as one kind of two-dimensional honeycomb structure crystal consisting of a single layer of carbon atoms.Theoretical and experimental studies all state its excellent optical,thermal and electrical properties clearly.As so on,combine graphene with optical fiber,taking advantage of the excellent properties of graphene,combining optical fiber micro nano optical transmission structure,to develop graphene optical fiber devices has became one of the research focus both here and abroad recent years.This thesis takes EFBG as the research object,and conducts in-depth researches on the temperature and optical properties of the graphene film EFBG parts through a combination of theories and experiments based on the exceptive optical and thermal properties of graphene materials.The topics mainly include:1.The analysis of the properties of EFBG and graphene films,the theoretical researches on the theoretical models and sensing mechanism of FBG and EFBG.The theoretical foundation for the research of graphene film EFBG photoenic devices was provided through the research of the effects of graphene on the EFBG light field transmission through mode field simulation software.2.The research on the temperature characteristics of graphene Film EFBG.The temperature characteristics of the graphene film EFBG were further researched based on the research of the temperature characteristics of FBG.The temperature sensitivity was obtained under different treatment methods in the experiment.The sensitivity of the untreated FBG was 10.3pm/?,the temperature sensitivity of EFBG was 11pm/?,and the temperature sensitivity of the graphene file EFBG was 11.6pm/?.3.The optical properties of the graphene film EFBG were researched.The optical properties of the EFBG devices deposited with graphene oxide were studied by taking graphene film EFBG as the research object,and the optical properties of graphene films with different thicknesses were experimented.The experimental results showed that,when the power of broadband light source changed from 1mW to 55mW,the wavelength of the EFBG with the cladding peak remained unchanged,and the wavelength of the EFBG without the cladding peak was red shifted with a total drift of 2.6nm.The sensitivity was 119.3pm/mw;the optical properties became more pronounced when the thickness of the graphite film was increased;when the thickness of the graphene film was 4.8 nm,the wavelength shift was the largest and the total drift was 3.433 nm,and the wavelength and power had a good linear relationship.4.The optical properties of laser light sources with different wavelengths were researched.Laser light sources with wavelengths of 1500 nm,1550 nm,and 1600 nm were used respectively to perform in the light control experiment.The experimental results show that,the laser light sources with wavelengths of 1500 nm,1550 nm,and 1600 nm were individually adjusted in their power,and the optical sensitivities obtained were 57.6pm/nm?52.7pm/mw?45.8pm/mw;the shorter the wavelength,the better the optical properties,and the wavelength and power had a good linear relationship.