Reports a theory for calculating the coupling length L/sub c/ of Ti:LiNbO/sub 3/ single-mode waveguide directional couplers from process parameters and operating wavelength. Estimates are accurate to within a factor of 2 compared with published experimental results for z-cut y-propagating LiNbO/sub 3/ devices for 0.63 mu m>
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Hawkins et al. (1988) studied this question.
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