We measure the birefringence Deltabeta = beta- beta TE of LiNbO(3):Ti single-mode strip waveguides at lambda = 1.54 microm by scanning a polarization-coupling perturbation along the guide and observing the variations of output polarization. With electro-optic and thermo-optic probing, beat lengths of 20 microm to 20 mu;m are measured with a resolution of up to delta(Deltabeta) approximately 10(-3) cm(-1).Influences of temperature and strip width on Deltabeta are observed.
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Stolte et al. (1995) studied this question.
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