A new method of coupling from a single-mode fiber to a thin-film waveguide through a coupling fiber is reported. This method provides high coupling efficiency, whereby the coupling fiber helps to match the coupling conditions. Experimentally the maximum coupling efficiency of 78% was obtained by use of a polymeric thin-film waveguide, in which propagation loss of the film and other coupling losses were excluded. The system also provides the means to measure characteristics of the polymeric films.
© 1994 Optical Society of America
Original Manuscript: June 7, 1994
Published: December 15, 1994
Alok K. Das and Amar K. Ganguly, "Efficient method of coupling from a single-mode fiber to a thin-film waveguide," Opt. Lett. 19, 2110-2112 (1994)