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A hybrid integrated waveguide isolator on a silica-based planar lightwave circuit

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8 Author(s)
Sugimoto, N. ; NTT Opto-Electron. Labs., Ibaraki, Japan ; Terui, H. ; Tate, A. ; Katoh, Y.
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La and Ga substituted yttrium iron garnet single-mode buried channel waveguides, prepared using liquid-phase-epitaxial growth and Ar ion beam etching, have been successfully applied as 45° nonreciprocal waveguide rotators (NRWR) for hybrid integrated waveguide isolators at λ=1.55 μm. The optical and magneto-optical properties of the prepared 45° NRWRs and the epitaxial films are investigated in detail. We describe the assembly procedure and present optical measurement results for the hybrid integrated waveguide isolators. The hybrid isolators are composed of a 45° NRWR, a half-wave plate sheet, thin film-type polarizers, a thin plate-type permanent magnet and a silica-based waveguide on a silicon substrate. We obtained good waveguide isolators with low insertion losses (<3.2 dB) and high isolation (>25 dB) in the 1.5 μm wavelength band

Published in:

Lightwave Technology, Journal of  (Volume:14 ,  Issue: 11 )

Date of Publication:

Nov 1996

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