tailieunhanh - Influence of structure parameters on the supercontinuum generation of photonic crystal fiber

In this paper, we report a numerical calculation of the influence of structural parameters on the supercontinuum generation of photonic crystal fibers. A photonic crystal fiber based on the fused silica glass, eight rings of air holes ordered in a hexagonal lattice, is proposed. Guiding properties in terms of dispersion and confinement loss of the fundamental mode are also studied numerically. As a result, the broadband width of the supercontinuum spectrum will increase when the lattice pitch decreases or the diameter of air hole in the cladding increases. However, the coherence of SC will become worse. | Influence of structure parameters on the supercontinuum generation of photonic crystal fiber Nghiên cứu khoa học công nghệ INFLUENCE OF STRUCTURE PARAMETERS ON THE SUPERCONTINUUM GENERATION OF PHOTONIC CRYSTAL FIBER Chu Van Bien1 Tran Dinh Duc1 Nguyen Manh An1 Ho Dinh Quang 2 Nguyen Manh Thang3 Le Van Hieu 1 Abstract In this paper we report a numerical calculation of the influence of structural parameters on the supercontinuum generation of photonic crystal fibers. A photonic crystal fiber based on the fused silica glass eight rings of air holes ordered in a hexagonal lattice is proposed. Guiding properties in terms of dispersion and confinement loss of the fundamental mode are also studied numerically. As a result the broadband width of the supercontinuum spectrum will increase when the lattice pitch decreases or the diameter of air hole in the cladding increases. However the coherence of SC will become worse. Keywords Nonlinear optics Photonic crystal fiber Dispersion Supercontinuum generation. 1. INTRODUCTION In recent years photonic crystal fibers PCFs have received more attention of many scientists all over the world because it contains special properties such as single-mode operation 1 high birefringence 2 high nonlinearity 3 easily controllable dispersion characteristics to achieve the flat or ultra-flattened dispersion 4 . So that PCFs have been applied in many areas for supercontinuum generation biomedical engineering and sensing applications 5 6 . Especially PCFs enable change dispersion characteristics as well as nonlinear properties by variations in structural parameters such as hole size arrangement spacing shape lattice constant and linear filling factors f 7 . Among numerous applications of PCFs one most popular is the generation of supercontinuum SC . Due to its interesting characteristics the SC generation has widely used in optical communication systems optical coherence tomography frequency metrology spectroscopy 8-10 . For efficient broadband