Waveguide Diagnostics by a Tunable Semiconductor Laser

摘要

A set-up for waveguide characterisation using a tunable semiconductor laser has been built. The optical losses in different types of channel waveguides (Ti:LiNbO_3, Er:LiNbO_3, glass) have been measured in the wavelength range 1500–1640 nm, the group effective index of a Ti:LiNbO_3 waveguide has been determined, too.