Investigation of Tapered Fiber for Ultrafast Application

Investigation of Tapered Fiber for Ultrafast Application

Kartik Peddiwar¹, Vedshree Andure², Mrunalee Sonawane³, Prof. G. N. Gaikwad⁴*
¹²³Student, Electronics and Telecommunication Engineering, Sinhgad College of Engineering, Pune, India
⁴Assistant Professor, Electronics and Telecommunication Engineering, Sinhgad College of Engineering, Pune, India

Abstract

Supercontinuum generation (SCG) is a nonlinear optical phenomenon that enables the transformation of narrowband ultrafast laser pulses into a broad, continuous spectrum. This study presents a detailed investigation into the performance of tapered and untapered optical fibers specifically standard single-mode fiber (SMF-28) and photonic crystal fiber (PCF) for SCG under ultrashort pulse excitation. Using a 1060 nm femtosecond laser source with 30 fs pulse duration, we conducted numerical simulations based on the Generalized Nonlinear Schrödinger Equation (GNLSE) in MATLAB. Key nonlinear effects including self-phase modulation, four-wave mixing, Raman scattering, and soliton dynamics were analyzed in both fiber types. The simulation results demonstrated significant spectral broadening, with the output spectrum extending from 500 nm to 1300 nm, confirming efficient supercontinuum generation. This work provides critical insights into the design and optimization of fiber geometries for ultrafast optical applications and lays the groundwork for compact, broadband light sources used in spectroscopy, biomedical and high-speed optical communication

Keywords: Supercontinuum Generation (SCG), Single-Mode Fiber (SMF-28), Photonic Crystal Fiber (PCF), Nonlinear Optics, Self-Phase Modulation (SPM), Raman Scattering.