An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Using Bi:YIG Thin-Films

Yasumitsu MIYAZAKI; Kazunari TAKI

An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Using Bi:YIG Thin-Films

Yasumitsu MIYAZAKI, Kazunari TAKI

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A mono-sectional optical isolator consists of two mode selectors and one mode converter whose magnetization is uniform and tilts in the plane transverse to the light propagation direction by an elevation angle θ from the film plane. Nonreciprocal mode conversion properties of the converter which is the gyrotropic waveguide magnetized in an arbitrary direction have been theoretically investigated by using hybrid modes, and isolation properties of the mono-sectional optical isolator have been derived. The unidirectional mode conversion can be achieved in one mode converter because the mode conversions through the first and second order magnetooptic factors, and f₄₄M², add up and cancel each other in the backward and forward directions, respectively, when the film thickness is near the cut-off. The propagation length for the unidirectional mode conversion becomes small with the increase of and θ depends on f₄₄M²/. When the refractive index and the optical birefringence are 2.18 and 1.2810³, 4.18510³, f₄₄M²0.2 for the Bi:YIG guide layer and the refractive index of the substrate is n₂2.165, the isolation ratio of 30dB can be achieved at θ82 for the length of 5.0mm and the guide layer thickness of 1.64µm. Under this condition, the single mode operation which is essential to the optical isolator can be guaranteed.

Publication: IEICE TRANSACTIONS on transactions Vol.E72-E No.6 pp.742-750

Publication Date: 1989/06/25

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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 Using Bi:YIG Thin-Films" in IEICE TRANSACTIONS on transactions, vol. E72-E, no. 6, pp. 742-750, June 1989, doi: .
Abstract: A mono-sectional optical isolator consists of two mode selectors and one mode converter whose magnetization is uniform and tilts in the plane transverse to the light propagation direction by an elevation angle θ from the film plane. Nonreciprocal mode conversion properties of the converter which is the gyrotropic waveguide magnetized in an arbitrary direction have been theoretically investigated by using hybrid modes, and isolation properties of the mono-sectional optical isolator have been derived. The unidirectional mode conversion can be achieved in one mode converter because the mode conversions through the first and second order magnetooptic factors, and f₄₄M², add up and cancel each other in the backward and forward directions, respectively, when the film thickness is near the cut-off. The propagation length for the unidirectional mode conversion becomes small with the increase of and θ depends on f₄₄M²/. When the refractive index and the optical birefringence are 2.18 and 1.2810³, 4.18510³, f₄₄M²0.2 for the Bi:YIG guide layer and the refractive index of the substrate is n₂2.165, the isolation ratio of 30dB can be achieved at θ82 for the length of 5.0mm and the guide layer thickness of 1.64µm. Under this condition, the single mode operation which is essential to the optical isolator can be guaranteed.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e72-e_6_742/_p

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@ARTICLE{e72-e_6_742,
author={Yasumitsu MIYAZAKI, Kazunari TAKI, },
journal={IEICE TRANSACTIONS on transactions},
title={An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Using Bi:YIG Thin-Films},
year={1989},
volume={E72-E},
number={6},
pages={742-750},
abstract={A mono-sectional optical isolator consists of two mode selectors and one mode converter whose magnetization is uniform and tilts in the plane transverse to the light propagation direction by an elevation angle θ from the film plane. Nonreciprocal mode conversion properties of the converter which is the gyrotropic waveguide magnetized in an arbitrary direction have been theoretically investigated by using hybrid modes, and isolation properties of the mono-sectional optical isolator have been derived. The unidirectional mode conversion can be achieved in one mode converter because the mode conversions through the first and second order magnetooptic factors, and f₄₄M², add up and cancel each other in the backward and forward directions, respectively, when the film thickness is near the cut-off. The propagation length for the unidirectional mode conversion becomes small with the increase of and θ depends on f₄₄M²/. When the refractive index and the optical birefringence are 2.18 and 1.2810³, 4.18510³, f₄₄M²0.2 for the Bi:YIG guide layer and the refractive index of the substrate is n₂2.165, the isolation ratio of 30dB can be achieved at θ82 for the length of 5.0mm and the guide layer thickness of 1.64µm. Under this condition, the single mode operation which is essential to the optical isolator can be guaranteed.},
keywords={},
doi={},
ISSN={},
month={June},}

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TY - JOUR
TI - An Analysis of Isolation Properties of Mono-Sectional Optical Isolators Using Bi:YIG Thin-Films
T2 - IEICE TRANSACTIONS on transactions
SP - 742
EP - 750
AU - Yasumitsu MIYAZAKI
AU - Kazunari TAKI
PY - 1989
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E72-E
IS - 6
JA - IEICE TRANSACTIONS on transactions
Y1 - June 1989
AB - A mono-sectional optical isolator consists of two mode selectors and one mode converter whose magnetization is uniform and tilts in the plane transverse to the light propagation direction by an elevation angle θ from the film plane. Nonreciprocal mode conversion properties of the converter which is the gyrotropic waveguide magnetized in an arbitrary direction have been theoretically investigated by using hybrid modes, and isolation properties of the mono-sectional optical isolator have been derived. The unidirectional mode conversion can be achieved in one mode converter because the mode conversions through the first and second order magnetooptic factors, and f₄₄M², add up and cancel each other in the backward and forward directions, respectively, when the film thickness is near the cut-off. The propagation length for the unidirectional mode conversion becomes small with the increase of and θ depends on f₄₄M²/. When the refractive index and the optical birefringence are 2.18 and 1.2810³, 4.18510³, f₄₄M²0.2 for the Bi:YIG guide layer and the refractive index of the substrate is n₂2.165, the isolation ratio of 30dB can be achieved at θ82 for the length of 5.0mm and the guide layer thickness of 1.64µm. Under this condition, the single mode operation which is essential to the optical isolator can be guaranteed.
ER -