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Second harmonic generation (SHG) and propagation loss have been measured on nanocrystallized optical fibers of tellurite-based glass, 15K2O·15Nb2O5·70TeO2. The result of the angular dependence of the SHG intensity is discussed based on the difference in the transmission factor varying with the polarization direction. Propagation-loss measurements on the fiber samples by a cut-back method showed low loss compared with that of a typical LiNbO3 waveguide.

Optical characteristics of nanocrystallized glass fiber with second-order optical nonlinearity