Efficient tapered Nb2O5 transition waveguide obtained by reactive sputtering has been demonstrated experimentally. It provides effective interconnection between two sections of Ti-indiffused waveguide with 0.8-dB total insertion loss. Chirped grating lenses have also been fabricated on Nb2O5 waveguides that have yielded 85% throughput efficiency. For signal processing applications in Ti-indiffused waveguides, the combination of grating lenses and the Nb2O5 transition waveguide will allow us to obtain lens functions that have both high efficiency and large angular field of view (~4°).
© 1983 Optical Society of America
Siamak Forouhar, Ron-Xin Lu, William S. C. Chang, Richard L. Davis, and Shin-Kay Yao, "Chirped grating lenses on Nb2O5 transition waveguides," Appl. Opt. 22, 3128-3132 (1983)