We report an abnormal waveguiding phenomenon that the fundamental mode guided in strip waveguides of a special Ti-diffused LiNbO3 waveguide structure. in which an array of 4and 6-μm-wide strip waveguides is embedded in a planar waveguide. nonperiodically oscillates with the wavelength along the waveguide width direction. The oscillation amplitude reaches 2 μm. https://jalyttlers.shop/product-category/cake-tins/