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A new periodic waveguide structure with grooves etched on the surface of a proton-exchanged LiNbO3 ridge is demonstrated. The grooves were fabricated by ICP dry etching. A steep stop band of 3.2 nm width at 1.545 mum was obtained by the 355 mum-long periodic waveguide. Induced optical group delay was estimated at 4.6 ps per 1 mm waveguide length.