An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Consisting of Magnetooptic Guide Layers and Substrates

Yasumitsu MIYAZAKI; Kazunari TAKI

An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Consisting of Magnetooptic Guide Layers and Substrates

Yasumitsu MIYAZAKI, Kazunari TAKI

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Isolation properties of mono-sectional optical isolators consisting of magnetooptic guide layers and substrates have been theoretically investigated by using hybrid modes. The magnetization of its mode converter uniformly tilts by an elevation angle θ from the film plane in the plane transverse to the light propagation direction. The guide layer thickness is chosen to be near the cut-off so that the longitudinal electric field should be large and the mode conversions through the first and second order magnetooptic effects should be the same each other. Since these mode conversions cancel and add up each other in the forward and backward directions, respectively, the unidirectional mode conversion can be realized. By using the substrate which has the opposite first order magnetooptic effect to that of the guide layer, the propagation length of the mode converter can be reduced. When the refractive index, optical birefringence, the first and the second order magnetooptic effects of the guide layer are 2.18, 2.510^-3, -2.7910^-3 and -5.5810^-4, and those of the substrate are 2.137, 2.510^-3, 3.8510^-4 and -7.7010^-5 at the wavelength of 1.152µm, the isolation ratio of 30 dB can be achieved at the propagation length of 4.68 mm and the film thickness of W=0.975µm by tilting the magnetization by the elevation angle of θ=79.5 for the refractive index of the top layer of 1.50.

Publication: IEICE TRANSACTIONS on transactions Vol.E73-E No.5 pp.695-704

Publication Date: 1990/05/25

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Type of Manuscript: PAPER

Category: Electro-Optics

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Yasumitsu MIYAZAKI
Kazunari TAKI

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Yasumitsu MIYAZAKI, Kazunari TAKI, "An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Consisting of Magnetooptic Guide Layers and Substrates" in IEICE TRANSACTIONS on transactions, vol. E73-E, no. 5, pp. 695-704, May 1990, doi: .
Abstract: Isolation properties of mono-sectional optical isolators consisting of magnetooptic guide layers and substrates have been theoretically investigated by using hybrid modes. The magnetization of its mode converter uniformly tilts by an elevation angle θ from the film plane in the plane transverse to the light propagation direction. The guide layer thickness is chosen to be near the cut-off so that the longitudinal electric field should be large and the mode conversions through the first and second order magnetooptic effects should be the same each other. Since these mode conversions cancel and add up each other in the forward and backward directions, respectively, the unidirectional mode conversion can be realized. By using the substrate which has the opposite first order magnetooptic effect to that of the guide layer, the propagation length of the mode converter can be reduced. When the refractive index, optical birefringence, the first and the second order magnetooptic effects of the guide layer are 2.18, 2.510^-3, -2.7910^-3 and -5.5810^-4, and those of the substrate are 2.137, 2.510^-3, 3.8510^-4 and -7.7010^-5 at the wavelength of 1.152µm, the isolation ratio of 30 dB can be achieved at the propagation length of 4.68 mm and the film thickness of W=0.975µm by tilting the magnetization by the elevation angle of θ=79.5 for the refractive index of the top layer of 1.50.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e73-e_5_695/_p

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@ARTICLE{e73-e_5_695,
author={Yasumitsu MIYAZAKI, Kazunari TAKI, },
journal={IEICE TRANSACTIONS on transactions},
title={An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Consisting of Magnetooptic Guide Layers and Substrates},
year={1990},
volume={E73-E},
number={5},
pages={695-704},
abstract={Isolation properties of mono-sectional optical isolators consisting of magnetooptic guide layers and substrates have been theoretically investigated by using hybrid modes. The magnetization of its mode converter uniformly tilts by an elevation angle θ from the film plane in the plane transverse to the light propagation direction. The guide layer thickness is chosen to be near the cut-off so that the longitudinal electric field should be large and the mode conversions through the first and second order magnetooptic effects should be the same each other. Since these mode conversions cancel and add up each other in the forward and backward directions, respectively, the unidirectional mode conversion can be realized. By using the substrate which has the opposite first order magnetooptic effect to that of the guide layer, the propagation length of the mode converter can be reduced. When the refractive index, optical birefringence, the first and the second order magnetooptic effects of the guide layer are 2.18, 2.510^-3, -2.7910^-3 and -5.5810^-4, and those of the substrate are 2.137, 2.510^-3, 3.8510^-4 and -7.7010^-5 at the wavelength of 1.152µm, the isolation ratio of 30 dB can be achieved at the propagation length of 4.68 mm and the film thickness of W=0.975µm by tilting the magnetization by the elevation angle of θ=79.5 for the refractive index of the top layer of 1.50.},
keywords={},
doi={},
ISSN={},
month={May},}

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TY - JOUR
TI - An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Consisting of Magnetooptic Guide Layers and Substrates
T2 - IEICE TRANSACTIONS on transactions
SP - 695
EP - 704
AU - Yasumitsu MIYAZAKI
AU - Kazunari TAKI
PY - 1990
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E73-E
IS - 5
JA - IEICE TRANSACTIONS on transactions
Y1 - May 1990
AB - Isolation properties of mono-sectional optical isolators consisting of magnetooptic guide layers and substrates have been theoretically investigated by using hybrid modes. The magnetization of its mode converter uniformly tilts by an elevation angle θ from the film plane in the plane transverse to the light propagation direction. The guide layer thickness is chosen to be near the cut-off so that the longitudinal electric field should be large and the mode conversions through the first and second order magnetooptic effects should be the same each other. Since these mode conversions cancel and add up each other in the forward and backward directions, respectively, the unidirectional mode conversion can be realized. By using the substrate which has the opposite first order magnetooptic effect to that of the guide layer, the propagation length of the mode converter can be reduced. When the refractive index, optical birefringence, the first and the second order magnetooptic effects of the guide layer are 2.18, 2.510^-3, -2.7910^-3 and -5.5810^-4, and those of the substrate are 2.137, 2.510^-3, 3.8510^-4 and -7.7010^-5 at the wavelength of 1.152µm, the isolation ratio of 30 dB can be achieved at the propagation length of 4.68 mm and the film thickness of W=0.975µm by tilting the magnetization by the elevation angle of θ=79.5 for the refractive index of the top layer of 1.50.
ER -