Characteristics Analysis Of Novel Photonic Crystal Fiber And Design Of Photonic Crystal Filter

Nowadays, with the rapid development of the society, optics communication and opticssensing have become an indispensable part in modern times. Act as the key part of opticsapplications, the characteristics of fiber such as birefringence, dispersion, nonlinearity andloss are the main factors which restrict the application in high precision areas. Traditionalfibers cannot make a further improvement because the basic theories are quite mature. Inconsequence, enhance the characteristics of fibers and replace traditional fibers with novelfibers have been investigated by many researchers. Photonic crystal is a new structure whichhas potential application in deigning of optic-fiber and filter. For example, photonic crystalfiber (PCF) is a new type of fiber, which exhibits many unique properties, such as propagatewith single mode in a wide wavelength range, high birefringence, flexible dispersion and highnonlinearity. This shows that PCF will find important applications in integrated device andmicromation of optic-fiber-device in the future, and has been a new hotspot in manyuniversities and research institutes.In this paper, aiming at the requirement of high birefringence, negative dispersion,multiple zero-dispersion and multiple channel filters in fiber-optic systems, photonic crystalfibers with different structure and photonic crystal filters have been modeled. Simulations aremade to optimize the performance, and then photonic crystal fiber with high performance andfilter with high transmission are obtained. Innovations in this paper include:(1) A new type of mixed-cladding PCF is proposed, the relationships betweencharacteristics and structure parameters along with the variation of propagation wavelengthhave been discussed by using finite element method (FEM). The influence of parameters offiber cladding on characteristics of whole fiber such as distribution of mode, dispersion,birefringence and nonlinearity is acquired, and a prospective structure with high birefringencethe level of10-3and two zero-dispersion points is obtained.(2) A new type of mixed-core PCF is proposed, the influence of parameters of fiber coreon characteristics of whole fiber such as dispersion, birefringence and nonlinearity isanalyzed. Curves of characteristics varying with structure parameters and distribution ofmode are acquired, and a prospective structure with high birefringence the level of10-2andnegative dispersion is obtained.(3) Aiming at the requirement of multiple channel filters in optics communicationsystems, a new type of photonic crystal filter with dual channel photonic crystal filter based on resonance coupling theory is proposed. This filter includes resonance cavity, couplingcolumn and filter channel, and by using of the FEM the transmission of different couplingdiameter is analyzed. We mainly investigate the influence of the diameter of coupling columnon transmission coefficients and filtering wavelength of each channel. The curves ofpropagation performance varying with wavelength under different coupling column diameterare obtained and contrastively analysis is also made.Finally, summarize the full-text and point out that the proposed photonic fibers will playan important role in fiber-optic sensing systems and optical communication systems becauseof their favorable properties. And the proposed photonic crystal filter will find importantapplication in wavelength division multiplexed (WDM) optical communication systems. Inaddition, according to the development of society, we also point out the next investigationand the mainly aspect in the future.