Study On Characteristics Of Single Mode Sigle Polarization Micro Structured Optical Fiber Based On SPR Effect

With the continuous development of modern communication technology,ultra-largecapacity and ultra-high-speed information transmission have increasingly become the focus of attention.For optical fiber communication networks,polarization mode dispersion and mode crosstalk will seriously affect the transmission efficiency of optical fibers.The singlemode single-polarization microstructure fiber is a good medium to solve the above problems.In addition,light energy acts on the metal surface to produce surface plasmon resonance effects,so it has been widely used in the field of sensing and filtering in recent years.In this paper,the exploration of the surface plasmon resonance effect is combined with the mode refractive index matching method used in the traditional single-mode single-polarization microstructured optical fiber to design a new type of single-mode single-polarization microstructured optical fiber,and characteristics of the fiber are analyzed.The main research contents of this paper are as follows:Firstly,the background and significance of the microstructured optical fiber and the light guiding mechanism of the total internal reflective microstructured optical fiber are briefly introduced,and the implementation of the single-mode single-polarization microstructured optical fiber and the current status of domestic and foreign research are elaborated.The surface plasmon resonance effect and development process are introduced in detail,and the calculation principle of the finite element numerical analysis method is described in detail;Secondly,the influence of the air hole parameters on the single-mode singlepolarization characteristics of the fiber is explored.These parameters include the positions and sizes of single-layer air holes,double air holes,and single air holes.Finally,the singlemode single-polarization microstructured optical fiber based on the refractive index matching principle is designed and the low-loss transmission of the fundamental mode of a polarization mode is realized;Thirdly,the refractive index matching method and surface plasmon resonance are combined and the influence of changing the position,size and thickness of the gold-plated air holes on the second and third order SPP modes are explored.Then,the narrow band single-mode single-polarization microstructured optical fiber based on the surface plasmon resonance effect is designed.At the center wavelength of 1310 nm,the confinement loss of the polarization mode to be filtered is 243 d B/m,and the confinement loss of the transmission polarization mode is 0.078 d B/m;Finally,according to the above exploration rules and basing on the principle of refractive index matching,a common point mode coupled single-mode single-polarization microstructured optical fiber based on the surface plasmon resonance effect is designed;in addition,in order to improve the confinement loss of the filtered mode of the uncoupled wavelength,we design a misaligned mode coupled broadband single-mode singlepolarization microstructured optical fiber which based on the surface plasmon resonance effect,and analyze the bending loss,mode area and dispersion of the microstructured optical fiber.