| As an interferometric optical fiber structure emerged in recent years,the all-fiber Michelson interferometer(AFMI),with the continuous development of material science and optical fiber coating technology,combines with various new materials and new technologies to build a new type of optical fiber interferometer.It has become one of the research hotspots in this field in recent years to explore its new photoelectric characteristics and develop various new optical fiber communication and sensor components to meet higher requirements.Graphene is a kind of nanomaterials with a two-dimensional honeycomb lattice structure only one carbon atom thick that has emerged in recent years.Due to its zero-band gap structure and the thickness of the single graphene is 0.335nm,it has unique optical,thermal,electrical and mechanical properties.By combining graphene with existing optical fiber structures,a new type of graphene membrane optical fiber device was constructed and its characteristics were studied,providing a new way to explore new communication and sensor components.In this paper,graphene coated all-fiber Michelson interferometer was taken as the research object.Based on the optical and thermal properties of graphene materials,the thermal and optical properties of graphene film all-fiber Michelson interferometer were studied by combining theoretical simulation and experimental research.The main work of the paper includes:1.The structure development of all-fiber Michelson interferometer,the study of graphene optical properties and the research status of graphene membrane fiber devices were reviewed.2.The mode field theory of interference structure is studied.Mainly includes:theoretical analysis of thermal properties of graphene,Model field theoretical simulation of single mode fiber-thin core fiber-single mode fiber(STS)structure,partly cladding-etched STS structure and graphene film partly cladding-etched STS structure.Simulation results show that partly cladding-etched and coated graphene film will stimulate more high-order cladding mode to exchange energy with the outside world.3.Experimental study on optical power modulation characteristics of all-fiber Michelson interferometer with different graphene film thickness.Experimental studies were carried out on the graphene-coated all-fiber Michelson interferometer with 20nm,800nm and 2μm film thickness respectively.The results showed that the light power modulation sensitivity of the interferometer was-22.37pm/mw when the graphene coated thickness was 800nm,higher than that of graphene film coated interferometers with other thickness.4.Experimental study on the temperature characteristics of the graphene film all-fiber Michelson interferometer.The experiments of the all-fiber Michelson interferometer,the partly cladding-etched all-fiber Michelson interferometer and graphene film partly cladding-etched all-fiber Michelson interferometer was studied,the experimental results show that the wavelength of the interferometer drifts linearly in the direction of long wave with the increase of temperature.The maximum drift amount of all-fiber Michelson interferometer is 29.37nm when the partly cladding-etched all-fiber Michelson interferometer with graphene film,indicating that the graphene film has a sensitization effect on the temperature characteristics of all-fiber Michelson interferometer.5.Experimental study on the optical power modulation characteristics of the graphene film all-fiber Michelson interferometer at different temperatures.By studying the optical power modulation characteristics of graphene film all-fiber Michelson interferometer under 20℃,35℃,50℃,and 100℃,the sensitivity of the interference wavelength changing with the power in the fiber was obtained as follows:-22.37pm/mw,-15.39pm/mw,-9.54pm/mw and-7.78pm/mw.The results showed that the lower the temperature,the higher the conductivity of graphene,and the higher the sensitivity of the light power modulation of graphene-coated all-fiber Michelson interferometer. |
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