Title :
Broad-band distributed Bragg reflectors with photorefractive Ti : Cu : LiNbO3 waveguide gratings
Author :
Kostritskii, S.M. ; Tavlykaev, R.F. ; Ramaswamy, R.V. ; Korkishko, Yu.N. ; Fedorov, V.A.
Author_Institution :
Moscow Inst. of Electron. Technol., Russia
Abstract :
We have realized broad-band distributed Bragg reflectors with photorefractive gratings recorded at 441.6 nm in channel Ti : Cu : LiNbO3 waveguides. Proton-assisted copper exchange is used to enable a high level of copper doping and, thereby, achieve an extremely large modulation of refractive index (/spl ges/ 5/sup */10/sup -4/) within a photorefractive grating. Experimental structures demonstrate reflectivities up to 17% with full-width at half-maximum bandwidths in excess of 1.2 nm at center wavelengths around 1.55 μm.
Keywords :
copper; diffraction gratings; distributed Bragg reflectors; ferroelectric materials; integrated optics; lithium compounds; optical modulation; optical waveguides; photorefractive materials; reflectivity; refractive index; titanium; 441.6 nm; LiNbO/sub 3/:Ti,Cu; broad-band Bragg reflectors; copper doping; distributed Bragg reflectors; ferroelectric materials; integrated optics; photorefractive gratings; proton-assisted copper exchange; reflectivities; refractive index modulation; waveguide components; waveguide grating; Bandwidth; Bragg gratings; Copper; Distributed Bragg reflectors; Doping; Electrooptical waveguides; Narrowband; Optical waveguide components; Optical waveguides; Photorefractive effect;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.834538
