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Optical directional coupler using deposited silica waveguides (DS guides)

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3 Author(s)
Y. Murakami ; Nippon Telegraph and Telephone Public Corp., Ibaraki-ken, Japan ; M. Ikeda ; T. Izawa

A new optical directional coupler using embedded single-mode glass waveguides is presented. The glass waveguides, called deposited silica waveguides (DS guides), were fabricated by depositing doped glass on a silica substrate after forming grooves by reactive sputter etching. Waveguide transmission loss was measured to be 1.3 dB/cm, and fiber-to-waveguide coupling loss was 0.1 dB. Using a tunable monochromatic light source, 96 percent power transfer or 14 dB isolation was measured. The DS guide directional coupler is compatible with single-mode fiber and is expected to be a useful component for future wavelength division multiplexing transmission systems.

Published in:

IEEE Journal of Quantum Electronics  (Volume:17 ,  Issue: 6 )