Ultraviolet laser fabrication of ultrastrong optical fiber gratings and of germania-doped channel waveguides

Abstract

We report the fabrication of low loss (<0.2 dB) fiber Bragg gratings of 10 nm reflection bandwidth, and of 19 nm bandwidth lossy gratings. With this technology we also demonstrate the direct writing of channel waveguides in commercial germania-doped wafers without the use of photoresist and etching.