• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.156-157
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• 2002

광 집적회로를 구현하기 위한 목적의 구성요소들로서 자기 광학적 효과를 이용한 아이솔레이터(isolator), 서큘레이터(circulator)등과 같은 소자들의 새로운 대안이 제시되고 있다. 현재 기존의 체적 아이솔레이터(bulk isolator)들이 마이크로 시스템에서 사용되고는 있으나 실용적인 해결점은 아닐 것이다. gyrotropic 도파로들의 광학적 TM 모드의 비가역적 위상변위(nonreciprocal phase shift)를 이용하는 경우 반도체 레이저를 광원으로 이용할 때 반사되어져 오는 광으로부터 레이저를 보호할 수 있는 광 아이솔레이터의 구현이 가능할 수 있다. 광통신에 사용되는 파장은 1.3$\mu$m 와 $1.5\mu$m에서 발달되어져 있다. (중략)

• Journal of the Korean Magnetics Society
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• v.15 no.2
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• pp.148-152
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• 2005

A novel interferometric isolator has been proposed and designed to fabrticate waveguide magnetooptic isolator operating at a wavelength of $1.55{\cal}um$. The device consists of MMI (multimode interference) couplers and has a magnetooptic guiding layer with different layer structure in arms of the inteferometer. The layer structures in the arms of inteferometer are $HfO_2/CeY_2Fe_5O_{12}/NOG$ and $SiO_2/CeY_2Fe_5O_{12}/NOG$, respectively. This configuration give rise to different nonreciprocal phase shift. In consequence, the isolator operates under a unidirectional magnetic field. The optimized structure of the isolator was determined by a 3D beam propagation method.

• Korean Journal of Optics and Photonics
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• v.14 no.2
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• pp.142-145
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• 2003

The nonreciprocal phase shift characteristics of infinite slab optical waveguides with magneto-optic materials in the cladding layer was calculated at 1.55 ${\mu}{\textrm}{m}$ for optical isolators. The infinite slab waveguide structures considered in this paper were as follows. rho magneto-optic materials used as a cladding layer were Ce:YIG and LNB(LuNdBi)$_3$(FeAl)$_{5}$)$_{12}$,). Their specific Faraday rotations Θ$_{F}$ are 4500$^{\circ}$/cm, 500$^{\circ}$/cm at wavelength 1.55 ${\mu}{\textrm}{m}$ respectively. The guiding layer with multi-quantum well structure was used, and it consists of 1.3Q and InGaAs. In order to investigate the effect of evanescent field penetrating the cadding, layer, guiding mode characteristics were calculated for the cases when the substrate is InP and air. We calculated the minimum lengths of 90$^{\circ}$ nonreciprocal phase shifters and their optimum guiding layer thicknesses in various optical waveguide structures.res.s.

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.505-506
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• 2006

• Journal of Magnetics
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• v.10 no.2
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• pp.41-43
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• 2005

We have investigated an optical waveguide isolator with a multimode interference section by wafer direct bonding, operating at a wavelength $1.55\;{\mu}m$. In order to fabricate the device for monolithic integration, the wafer direct bonding between a magnetic garnet material as a cladding layer and a semiconductor guiding layer has been achieved. We found that wafer direct bonding between InP and GGG $(Gd_3Ga_5O_{12})$ is effective for the integration of a waveguide optical isolator. The isolation ratio was obtained to be 2.9 dB in the device.