Tunable stop-band hollow waveguide Bragg reflectors with tapered air core for adaptive dispersion-compensation

摘要

We propose a tunable stop-band hollow waveguide Bragg reflector with a variable tapered air core for an adjustable dispersion-compensation device. The tapered air-core structure gives us chirped Bragg reflection. The precise control of tapered air-core thickness and angle enables us to achieve the dynamic tuning of both stop-band width and center wavelength of Bragg reflection. We demonstrate center-wavelength tuning of 20.1 nm corresponding to 1.3% of propagation constant change and stop-band expansion up to 5 nm. Also, we demonstrate dispersion tuning operation either in negative or positive dispersion ranges with delay-time difference of about 10 ps.