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US5291576A
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Single mode optical waveguide
Assignee: Ibiden Co Ltd
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Filing: 1993-06-17
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Granted: 1994-03-01
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Expires: 2013-06-17
Abstract
Abstract A waveguide becomes a single mode waveguide under the condition as described below. If the LiNbO 3 waveguide includes an Na content in a range of 0.1 to 14.3 mol % and an Mg content in a range of 0.8 to 10.8 mol %, and provided that T(μm) represents a thickness of the waveguide, and λ (μm) represents a wavelength of the guided wave, then the relationships in the following equations are preferable, in the case of TM mode, 1.9<(T+0.7)/λ<5.7 (T>0) in the case of TE mode, 0.29<(T+0.04)/λ<1.19 (T>0).
Inventors
- 👤 Masanori Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:01
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/125; C; C30; C30B; C30B19/00; C30B19/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/30; G02B2006/12035; G02B2006/1204; G02B2006/12083; G02B2006/12097; G02B2006/12119; G02B2006/12166; G02B2006/12178
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
A single mode optical waveguide characterized by comprising a crystal of LiNbO 3 thin film waveguide layer including at least an Na content in a range of 0.1 to 14.3 mol % and an Mg content in a range of 0.8 to 10.8 mol %, thereby lattice matching LiNbO 3 thin film waveguide layer and LiTaO 3 single crystal substrate, and following relationship being satisfied; in the case of TM mode, 1.9<(T+0.7)/λ<5.7 (T>0) in the case of TE mode, 0.29<(T+0.04)/λ<1.19 (T>0) where T(μm) represents a thickness of the waveguide layer, and λ (μm) a wavelength of the guided wave.
Claim 2
Dependent Claim
99 words
A single mode optical waveguide characterized by comprising a crystal of LiNbO 3 thin film waveguide layer including at least an Na content in a range of 0.1 to 14.3 mol % and an Mg content in a range of 0.8 to 10.8 mol %, thereby lattice matching LiNbO 3 thin film waveguide layer and LiTaO 3 single crystal substrate, and following relationship being satisfied; in the case of TM mode, 1.9<(T+0.7)/λ<5.7 (T>0) in the case of TE mode, 0.29<(T+0.04)/λ<1.19 (T>0) where T(μm) represents a thickness of the waveguide layer, and λ (μm) a wavelength of the guided wave.
Claim 3
Dependent Claim
50 words
A single mode optical waveguide as claimed in claim 1, wherein the shape of the optical waveguide satisfies the following relationship; in the case of TM mode, W≦(4λ-0.5)×(λ.sup.2 /ΔT+2.0) in the case of TE mode, W≦(0.04λ.sup.3 +0.1λ.sup.2)/ΔT+2.5λ where W(μm) represents a width of the waveguide, ΔT(μm) represents an etching depth.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |