Abstract
In this paper unique photonic crystal fiber (PCF) structure with nanoholes embedded have been studied. Embedded nanoholes have been filled with different materials of alcoholic groups like butanol, ethanol, methanol and propanol. Investigations of these structure shows flattened zero dispersion in visible range to far infrared regions. Simulated PCF structure reports ultra-low confinement loss of the order of 10-8 dB/km. Designed PCF promises to give large nonlinear coefficient of 3000 W-1Km-1 at 1335nm wavelengths. Numerical simulation of the fiber for the generation of supercontinuum generation (SCG) has been performed. Low power pump pulses of 50fs duration have been used. With a fiber of length of 15cm and pulses of 1kW, 2kW, 5kW and 10kW peak power, supercontinuum broadening of about 607nm, 908nm, 1987nm and 2405nm respectively.
Highlights
Supercontinuum generation is an inherent property of nonlinear optics [1,2]
photonic crystal fiber (PCF) structure consists of embedded nanoholes arranged in hexagonal arrangements
Designed PCFs have been simulated by finite element method (FEM) method of COMSOL Multiphysics 5.2 software
Summary
Supercontinuum generation is an inherent property of nonlinear optics [1,2]. It is widely used in optical communication [3], pulse compression [4], spectroscopic meteorology [5] and coherence tomography [6]. The first requirement to achieve this is to obtain zero ultra-flattened dispersion PCFs. The nonlinear effects like Soliton phenomenon, Raman effect and Kerr effect are used for supercontinuum generation. Photonic crystal fibers (PCFs) proposed by Russell, due to its unusual properties like endless single mode propagation [7], large non-linear coefficient [8], high birefringence [9] and chromatic dispersion [10] make them, a point of attraction for the researchers. PCFs often termed as microstructured optical fiber are formed by single material with periodic arrangement of multiple air filled holes surrounding core. These microstructured fibers are divided into photonic band gap and index guiding fibers [11,12]. A very large nonlinear coefficient has been obtained with ultra-low confinement loss
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