Design And Research Of Novel Single Core Highly Birefringent Photonic Crystal Fibers

Photonic crystal fiber(PCF) has excellent birefringent properties, the high birefringencephotonic crystal fiber has vital applications in high-speed optical communication, fiber opticsensing and precision optica instruments and other fields, it has become a research hotspotnowadays. Especially in the optical fiber information transmission, people are increasinglyusing high birefringence PCF to achieve the miniaturization and all optical of the system.Therefore, designing new type of high birefringence PCF has important significance.This paper primarily researches the high birefringence PCF, three kinds of novel signlecore PCF with high birefringence are proposed, and its basic characteristic is numericalsimulation and theoretical analysis by the full-vector finite element method (FEM). The workdetailed in the thesis is categorized as follows:1. The difference with the traditional fiber, classification, manufacture methods andapplication of PCF are briefly introduced. The present research situation of the single corehigh birefringent PCF are summarized.2. Several theoretical analysis methods of PCF are described, then focus on introducingthe basic principles of the full-vector finite element method(FEM) and the modeling processbased on CMOSOL software. In addition, the foundamental characteristics of PCF and how touse the FEM to calculate the characteristics in the practical design process are present indetail.3. A novel near-elliptic core photonic crystal fibers with high nonlinear and highbirefringence based on quartz glass is proposed. By adjusting the air hole pitch, thebirefringence reaches up to2.45102at the wavelength of1.55μm, a nonlinearcoefficient of52W1km1is also obtained. There are two zero dispersion points in thewavelength range of0.6μm-1.8μm.4. A high birefringence and low confinement loss PCF with multiple zero dispersionpoints based on micro-structured core is designed, whose background material is also quartz.Numerical results show that its fundamental characteristics can be flexibly adjusted bychanging the parameters of the air holes in the core when the parameters of the cladding airholes are fixed. The birefringence can be effectively tunable through selectively filling theadjustable refractive index liquid in the cladding. It is found that the birefringence can be upto3.45102, and the confinement loss can low to2.88109dBmat wavelength1.55μm, and three corresponding zero dispersion points can be obtained over wavelengthrange from0.6μm to2.0μm, which are located in visible, near-infrared and mid-infrared band,respectively.5. A novel highly birefringent PCF using the elliptical air holes in the cladding based onthe schott glass is proposed. The thesis has studied the material refractive index and material disersion of the schott glass. Its birefringence, confinement loss and dispersion characteristicsare investigated simultaneously by using the finite element method. Numerical results showthat the birefringence and confinement loss are respectively about5.22102and8.821010dBmat the wavelength1.55μm. In addition, the fiber keeps normaldispersion in a wavelength range from1.0μm to2.0μm. These will provide some referencefor the study of high birefringence PCF based on novel background material.