Cutoff wavelength of periodically segmented waveguides in Ti:LiNbO/sub 3/

The cutoff wavelength for Ti:LiNbO/sub 3/ periodic segmented waveguides (PSWs) with different duty-cycles and of continuous waveguides has been measured for both polarizations, PSWs are described by an equivalent continuous waveguide and, using this model, a universal relationship between the cutoff wavelength of PSWs with different duty-cycles is proposed and verified experimentally.