Study On Sensor Mechanism Of Photonic Crystal Fiber

As a new type optical fiber, because of its particular optical property, suchas single mode character, novel chromatic dispersion character, nonlinear andbirefringence properties, photonic crystal fibers (PCF) is developed so rapidlythat PCF has been a focus in optical fiber communication, optical fiber sensorand photoelectricity part field in recent years.This paper mainly discusses the following several facets:(1)The basic character of PCF and the development of PCF sensor isintroduced in the paper.(2)The methods used in PCF recently calculation are summarized. It ismainly discussed Finite-Difference Time-Domain Method (FDTDM) andFull-vector Plane-wave Method (FPWM) in the paper, which is widely used inPhotonic Crystal or PCF.(3)The Refraction Index Guiding Photonic Crystal Fiber (RG-PCF) withtriangle structure is analyzed by FDTDM and FPWM respectively, and themagnetic field distribution of PCF is gotten. In order to observe the effect onPCF, when the PCF air holes are injected with different medium, the magneticfield distribution is analyzed, when the medium relative dielectric constant andpropagation constant are changed. The relation between medium relativedielectric constant and magnetic field value in the center part of PCF is foundunder different propagation constant.(4)The photonic band-gap of triangle structure Photonic Band-gap PhotonicCrystal Fiber (PBG-PCF) is computed by FPWM. Furthermore the photonicband-gap is analyzed, when PCF is injected with different medium, and therelationship between relative dielectric constant and propagation frequency isgotten in the paper.The theory researched in this paper is the basis for optic fiber sensormanufacture.