Novel technique for measuring dispersion and detuning of a UV written silica-on-silicon waveguide

Rogers, H.L., Gates, J.C. and Smith, P.G.R. (2010) Novel technique for measuring dispersion and detuning of a UV written silica-on-silicon waveguide. Photon 10, , Southampton, United Kingdom. 23 - 26 Aug 2010. 1 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

We shall present a new method of measuring the dispersive properties of UV written waveguides in the silica-on-silicon platform used to fabricate planar Bragg gratings. The technique involves direct measurement of the modal refractive index of a waveguide produced in the material. The data obtained also provides additional information about the spectral range of Bragg grating inscription. This direct writing technique reported previously differs from fibre Bragg grating fabrication by the small spot size of the writing beam and permits detuning of the Bragg wavelength from 1250nm to 1625nm. The fabrication technique provides the exact period of the grating and thus interrogation of the gratings produces information on the effective index of the mode. A series of integrated gratings were fabricated in a direct UV written waveguide via the direct grating writing technique in order to measure the wavelength dependence of the refractive index of the material. The Sellmeier curve obtained is shown.

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