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Optical Performance of Bragg Gratings Fabricated in Ti:LiNbO _3 Waveguides by Focused Ion Beam Milling

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5 Author(s)
Ghoumid, K. ; Femto-ST Dept. d''Opt. P.M. Duffieux (LOPMD), Univ. de Franche-Comte, Besançon, France ; Ferriere, R. ; Benkelfat, B.-E. ; Guizal, B.
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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 μm 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 Λ = 1.8 μm and a length of 144 μm, in good agreement with theoretical predictions.

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Lightwave Technology, Journal of  (Volume:28 ,  Issue: 23 )