An experimental technique to determine the end-face scattering loss in electro-optic polymer channel waveguides is presented. The technique combines the cut-back and the optimum end-fire coupling methods. A loss resulting from the scattering was a prominent source of waveguide coupling loss and was strongly dependent on the end-face roughness of the guiding and cladding layers induced by cleaving. With the use of our investigation methods, other losses could also be examined with ease and high reliability.
© 1997 Optical Society of America
Hyang-Mok Lee, Min-Cheol Oh, Heuk Park, Wol-Yon Hwang, and Jang-Joo Kim, "End-face scattering loss in integrated-optical waveguides," Appl. Opt. 36, 9021-9024 (1997)