IMPROVED DESIGN OF MAGNETOOPTIC RIB WAVE-GUIDES FOR OPTICAL ISOLATORS

Garnet films of the following compositions (Lu,Bi)(3)(Fe,Ga,Al)(5)O-12 and (Tm,Bi)(3)(Fe,Ga)(5)O-12 are grown by liquid-phase epitaxy on [11 1]-oriented substrates of gadolinium gallium garnet. Double layers wit h opposite signs of Faraday rotation and single layers are prepared. O ptical monomode rib waveguides are realized using such films. The nonr eciprocal phase shift of the fundamental TM-Mode is studied both theor etically and experimentally at a wavelength of 1.3 mu m. The maximum n onreciprocal effect of double layer films is about 1.7 times larger th an that of similar single layer waveguides. Agreement between experime nts and calculations is excellent.