- Journal
- JOURNAL OF LIGHTWAVE TECHNOLOGY
- Année
- 2010
- Volume
- 28
- Numéro
- 23
- Pages
- 3488-3493
- Mois
- DEC 1
- DOI
- 10.1109/JLT.2010.2080258
Abstract
In this paper we propose an efficient technique for micromachining lithium niobate that is used in Ti-diffused waveguides. The use of Focused Ion Beam (FIB) etching allows obtaining homogeneous periodic microstructures. Bragg gratings with a period of 1.05 mu m and an aspect ratio of 6:1 (depth-to-half period ratio) have been achieved. A reflectivity greater than 95% associated with a bandwidth at half maximum of about 100 nm within a window centered at 1550 nm, is demonstrated for a Bragg grating of period Lambda = 1.8 mu m and a length of 144 mu m, in good agreement with theoretical predictions.