Bandwidth-Variable Bandpass Filter based on Dispersion Engineered Tapered Fiber with External Polymer Cladding

Abstract

A simple thermo-optic bandwidth-variable fiber-based bandpass filter is demonstrated by using a tapered standard single mode fiber covered with a dispersive polymer layer. The 3 dB spectral bandwidth can be tuned from 250 rim with a Gaussian shape to 500 nm with a flat-top shape. (C) 2008 Optical Society of America