The Letter proposes and demonstrates a nondestructive and simple method for optical-waveguide loss measurement in which the end-fire coupling efficiency is optimised so that an input beam spot size becomes exactly the same as the mode size of a guided wave. An accuracy of better than 0.05 dB/cm has been achieved in Ti: LiNbO3 waveguides.
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Haruna et al. (1992) studied this question.
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