We have derived nonlinear coupled mode equations appropriate for periodic channel waveguides. These equations contain the three different nonlinear coefficients which were not taken into account in the previous analysis provided by Stegeman et al.. [IEEE. J. Quantum Electron. 18 (1982) 1610.] It has been shown that such nonlinear coefficients lower the switching power for optical bistability generated in the periodic channel waveguides. Dependence of the switching power on the waveguide size, waveguide structure and the grating parameters has been numerically obtained for ridge polydiacetylene (PDA-C4UC4) waveguides.
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Okamoto et al. (1998) studied this question.
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