Faraday rotator with improved magnetooptic property
AssigneeAmerican Optics Science
InventorRongfu Xiao
Life of this patent
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Abstract
A liquid phase epitaxy method is used to grow the Faraday rotator with a small saturation field (Hs). The Faraday rotator has the formula: Bi3−x−y−zGdxTbyMzFe5−w−nGawPnO12, where M is selected from Y, Yb, Lu, and P is selected from Al, Si, Ge. X, y, w and n are chosen from the ranges of 0.5≦x≦1.0, 0.5≦y≦1.0, 0.2≦z≦0.5, 1.5≦x+y+z≦2.0, 0.5≦w≦1.0, 0.15≦n≦0.5, 0.8≦w+n≦1.2. Without M and P, a Type-L Faraday rotator with a linear BH curve is provided, which is well suited for variable optical attenuators. With M and P, a Type-R Faraday rotator with a rectangular hysteresis loop is provided, which is well suited for optical switches. Both are also well suited for use in optical isolators and circulators.
Claims16
A Faraday rotator having a formula:
- Bi3−x−y−zGdxTbyMzFe5−w−nGawPnO12,
- wherein M is selected from a group consisting of Y, Yb, Lu,
- wherein P is selected from a group consisting of Al, Si, Ge,
- wherein x has a range of 0.8≦x≦1.0,
- wherein y has a range of 0.5≦y≦1.0,
- wherein z has a range of 0.2≦z≦0.5
- wherein w has a range of 0.5≦w≦1.0, and
- wherein n has a range of 0.2≦n≦0.5.
A Faraday rotator having a formula:
- Bi3−x−yGdxTbyFe5−wGawO12,
- wherein x has a range of 0.5≦x≦1.0,
- wherein y has a range of 0.5≦y≦1.0, and
- wherein w has a range of 0.8≦w≦1.0.
An optical isolator, comprising:
- a Faraday rotator having a formula:
- Bi3−x−y−zGdxTbyMzFe5−w−nGawPnO12,
- wherein M is selected from a group consisting of Y, Yb, Lu,
- Wherein P is selected from a group consisting of Al, Si, Ge,
- wherein x has a range of 0.8≦x≦1.0,
- wherein y has a range of 0.5≦y≦1.0,
- wherein z has a range of 0.2≦z≦0.5
- wherein w has a range of 0.5≦w≦1.0, and
- wherein n has a range of 0.2≦n≦0.5.
An optical circulator, comprising:
- a Faraday rotator having a formula:
- Bi3−x−y−zGdxTbyMzFe5−w−nGawPnO12,
- wherein M is selected from a group consisting of Y, Yb, Lu,
- wherein P is selected from a group consisting of Al, Si, Ge,
- wherein x has a range of 0.8≦x≦1.0,
- wherein y has a range of 0.5≦y≦1.0,
- wherein z has a range of 0.2≦z≦0.5
- wherein w has a range of 0.5≦w≦1.0, and
- wherein n has a range of 0.2≦n≦0.5.
An optical switch, comprising:
- a Faraday rotator having a formula:
- Bi3−x−y−zGdxTbyMzFe5−w−nGawPnO12,
- wherein M is selected from a group consisting of Y, Yb, Lu,
- wherein P is selected from a group consisting of Al, Si, Ge,
- wherein x has a range of 0.8≦x≦1.0,
- wherein y has a range of 0.5≦y≦1.0,
- wherein z has a range of 0.2≦z≦0.5
- wherein w has a range of 0.5≦w≦1.0, and
- wherein n has a range of 0.2≦n≦0.5.
An optical isolator, comprising:
- a Faraday rotator having a formula:
- Bi3−x−yGdxTbyFe5−wGawO12,
- wherein x has a range of 0.5≦x≦1.0,
- wherein y has a range of 0.5≦y≦1.0, and
- wherein w has a range of 0.8≦w≦1.0.
An optical circulator, comprising:
- An optical isolator, comprising:
- a Faraday rotator having a formula:
- Bi3−x−yGdxTbyFe5−wGawO12,
- wherein x has a range of 0.5≦x≦1.0,
- wherein y has a range of 0.5≦y≦1.0, and
- wherein w has a range of 0.8≦w≦1.0.
An optical switch, comprising:
- An optical isolator, comprising:
- a Faraday rotator having a formula:
- Bi3−x−yGdxTbyFe5−wGawO12,
- wherein x has a range of 0.5≦x≦1.0,
- wherein y has a range of 0.5≦y≦1.0, and
- wherein w has a range of 0.8≦w≦1.0.
Dependencies are inferred from the claim text.