We report new measurements on LiNbO3 integrated optical circuits using
two setups based on the use of a low-coherence light source. Fundamen
tal limits of an ail-fiber optical low-coherence reflectometry setup a
re outlined, and a complete analysis of the measured optical parameter
s of the circuits and their effects is presented. We also report measu
rements related to a polarization-axis misalignment of pigtailed LiNbO
3 components.