Research On Transmission Characteristics Of Hollow Core Photonic Crystal Fiber Gratings

Photonic crystal fiber is a hotspot in the field of optical fiber communication research.Based on photonic crystal fiber of light guide mechanism, the photonic crystal fiber can bedivided into refractive index guiding photonic crystal fibers and photonic bandgapphotonic crystal fiber. Based on photonic bandgap photonic crystal fiber has manyexcellent features, arousing great concern of researchers. Therefore, this article mainlydiscusses the type tubular band gap photonic crystal fiber band gap and symmetricalcollapse and unilateral collapse two collapse modes of the transmission spectrum of fibergrating theory research.First, this paper introduces the refractive index guiding photonic crystal fiber,photonic band gap photonic crystal fiber and the study of the theory and application oflong period fiber grating.Secondly, a detailed study of the photonic band gap photonic crystal fiber theorymethod of the band gap, the plane wave expansion method, and the transmission spectrumof the finite element method and photonic crystal fiber grating coupled-mode theory. Andthe analysis of the structure change of fiber grating local coupled-mode theory has carriedon the detailed introduction.Then, in combination with the plane wave expansion method, hollow wave band gapsof triangular lattice photonic crystal band gap characteristics of optical fiber are studied,and the simulation, finally analyzes the effects of fiber parameters on the band gap, andproposes the related conclusion.Finally, we analyze the symmetrical collapse and unilateral collapse collapse mode offorming tubular band gap photonic crystal fiber grating transmission spectrumcharacteristics using the finite element method and local coupled-mode theory. Study themode coupling characteristics of optical fiber in collapse area and analysis the influence ofgrating parameters.