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.
© 2005 Optical Society of America
(130.2790) Integrated optics : Guided waves
(160.2750) Materials : Glass and other amorphous materials
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(230.7370) Optical devices : Waveguides
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
Wataru Watanabe, Yumiko Note, and Kazuyoshi Itoh, "Fabrication of multimode interference waveguides in glass by use of a femtosecond laser," Opt. Lett. 30, 2888-2890 (2005)