An effective method for coupling optical signals from single-mode fibers to thin-film waveguides is proposed. The authors show that this method provides high coupling efficiency for connecting fibers of different core diameters to thin-film waveguides of different film thicknesses or refractive indexes. The authors summarize the theoretical treatment of the coupler. Examples of couplers designed for SiO2 -based materials as well as iron garnets are presented. Fabrication of the proposed coupler and its experimental results are described
Published in:
Lightwave Technology, Journal of
(Volume:9
,
Issue:
5
)
Date of Publication: May 1991