title: Fabrication of multimode interference waveguides in glass by use of a femtosecond laser.
abstract: We report on the fabrication of multimode interference (MMI) waveguides that split single-mode light into multimode light in synthesized silica by use of femtosecond laser pulses. The number of modes at the output facet is dependent on both the width and the length of the MMI waveguides. The output spectral responses of the MMI waveguides in the visible region were examined. The fabricated MMI waveguides can be used as compact power splitters with large fan-outs.
authors.affiliation: Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan. watanabe@photonics.mls.eng.osakau.ac.jp
authors.forename: Wataru
authors.initials: W
authors.lastname: Watanabe
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Note
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Itoh