Abstract
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/spl deg/ nonreciprocal waveguide rotators (NRWR) for hybrid integrated waveguide isolators at /spl lambda/=1.55 /spl mu/m. The optical and magneto-optical properties of the prepared 45/spl deg/ 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/spl deg/ 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 ( 25 dB) in the 1.5 /spl mu/m wavelength band.
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