Protik Roy

IIT kharagpur, India

Ultra-broad Supercontinuum Generation using Elliptical Core Chalcogenide Fiber

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Biography

Abstract

For optimizing pulse propagation, we focus on a chalcogenide glass fiber with an elliptical core. Initially using a 13.2% GeO2-doped silica glass fiber, we explore As33S67 and As30S70 as core and cladding materials for the first chalcogenide fiber, and As40S60 and As42S58 for the second. Calculating crucial parameters for elliptical core silica, elliptical core chalcogenide, and circular core chalcogenide fibers, we simulate ultrafast pulse propagation using the generalized nonlinear Schrodinger equation (GNLSE) [1], ??zA+?2A+(??k?????2?????????1????!?k?Tk)A=i?(1+1????0????????????)×((1?????????)| |2+??????????????(????)?0|????(????,?????????)|2????????)???? (1) The GNLSE involves a slowly varying pulse envelope, A(z, T), evolving along the fiber structure in a time frame ???? = ???? – ????1????. Another key parameter, ?, represents transmission loss. The response function R(T) is expressed as ????(????) = (1 – ????????)????(????) + ???????? ????? (????), with ???????? values of 0.18 [1] for silica and 0.148 [2] for chalcogenide. To solve the GNLSE, we use a split-step Fourier method in MATLAB. Launching a hyperbolic secant pulse into a 5 cm elliptical core chalcogenide fiber, we achieve a flat intensity from 1190 nm to 2600 nm, covering a band of 1410 nm (Fig. 2). This highlights the efficacy of an elliptical core chalcogenide fiber for optimal pulse propagation