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An accurate theoretical analysis is presented describing optical amplification in Er-diffused Ti:LiNbO/sub 3/ channel waveguides. It follows as far as possible the theory already developed for Er-doped fibers. As optical pumping around /spl lambda//sub p//spl ap/1.48 /spl mu/m is considered, a quasi-two-level model for the Er/sup 3+/ ions is used with wavelength-dependent cross sections. The optical gain in the 1.53 /spl mu/m>
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Dinand et al. (1994) studied this question.
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