Patent US5280334A successfully refreshed from Google Patents.
US5280334A
Expired / Lapsed
US
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Apparatus for measuring cross-sectional distribution of refractive index of optical waveguide by RNF method
Assignee: Topcon Corp
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Filing: 1992-04-07
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Granted: 1994-01-18
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Expires: 2012-04-07
Abstract
Abstract According to the present invention, there are provided a projection system for emitting luminous flux for measurement, a light receiving unit or a prism member furnished with a light receiving unit, and an optical waveguide substrate comprising a substrate portion and an optical waveguide portion formed on the substrate portion, the light receiving unit or the prism is brought into close contact with the optical waveguide substrate, luminous flux for measurement from the projection system is passed from one end of the optical wavegide portion and a part of the luminous flux for measurement is leaked toward the light receiving unit, whereby cross-sectional distribution of refractive index of the optical waveguide is measured by change of light quantity of the leaking light sensed at the light receiving unit in case an incident point of the luminous flux for measurement is moved.
Inventors
- 👤 Nicolas Gisin
- 👤 Patrick Stamp
- 👤 Nobuo Hori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:19
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/412
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
127 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method, comprising a projection system for scanning luminous flux for measurement across one end surface of the optical waveguide portion arranged on one side of a substrate portion, a prism member having refractive index close to that of the substrate portion and placed in close contact with the surface of the optical waveguide portion, and a light receiving unit arranged to receive the light leaking from the optical waveguide portion and passing through the prism member, whereby cross-sectional distribution of refractive index of the optical waveguide is measured by change of light quantity entering the light receiving unit as the incident point of the luminous flux for measurement is moved during scanning.
Claim 2
Independent Claim
127 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method, comprising a projection system for scanning luminous flux for measurement across one end surface of the optical waveguide portion arranged on one side of a substrate portion, a prism member having refractive index close to that of the substrate portion and placed in close contact with the surface of the optical waveguide portion, and a light receiving unit arranged to receive the light leaking from the optical waveguide portion and passing through the prism member, whereby cross-sectional distribution of refractive index of the optical waveguide is measured by change of light quantity entering the light receiving unit as the incident point of the luminous flux for measurement is moved during scanning.
Claim 3
Dependent Claim
35 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method according to claim 1, wherein a liquid film is placed between the optical waveguide unit and the prism member.
Claim 4
Dependent Claim
28 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method according to claim 1, wherein prism member is immersed in medium liquid.
Claim 5
Independent Claim
115 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method, comprising a projection system for scanning luminous flux for measurement across one end surface of the optical waveguide portion arranged on one side of a substrate portion, and a light receiving unit placed close to the surface of the substrate portion on the side opposite to the optical waveguide portion and receiving the light leaking from the waveguide among luminous fluxes for measurement, whereby cross-sectional distribution of refractive index of the optical waveguide is measured by change of light quantity entering the light receiving unit as the incident point of the luminous flux for measurement is moved during scanning.
Claim 6
Independent Claim
115 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method, comprising a projection system for scanning luminous flux for measurement across one end surface of the optical waveguide portion arranged on one side of a substrate portion, and a light receiving unit placed close to the surface of the substrate portion on the side opposite to the optical waveguide portion and receiving the light leaking from the waveguide among luminous fluxes for measurement, whereby cross-sectional distribution of refractive index of the optical waveguide is measured by change of light quantity entering the light receiving unit as the incident point of the luminous flux for measurement is moved during scanning.
Claim 7
Dependent Claim
33 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method according to claim 4, wherein liquid film is placed between the light receiving unit and the substrate.
Claim 8
Dependent Claim
31 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method according to claim 4, wherein the light receiving unit is immersed in the medium liquid.
Claim 9
Independent Claim
132 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method, comprising a projection system for scanning luminous flux for measurement across one end surface of the optical waveguide portion arranged on one side of a substrate portion, a prism member having refractive index close to that of the substrate portion and placed in close contact with the surface of the substrate portion opposite to the optical waveguide portion, and a light receiving unit arranged to receive the light leaking from the optical waveguide portion and passing through the prism member, whereby cross-sectional distribution of refractive index of the optical waveguide is measured by change of light quantity entering the light receiving unit as the incident point of the luminous flux for measurement is moved during scanning.
Claim 10
Independent Claim
132 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method, comprising a projection system for scanning luminous flux for measurement across one end surface of the optical waveguide portion arranged on one side of a substrate portion, a prism member having refractive index close to that of the substrate portion and placed in close contact with the surface of the substrate portion opposite to the optical waveguide portion, and a light receiving unit arranged to receive the light leaking from the optical waveguide portion and passing through the prism member, whereby cross-sectional distribution of refractive index of the optical waveguide is measured by change of light quantity entering the light receiving unit as the incident point of the luminous flux for measurement is moved during scanning.
Claim 11
Dependent Claim
33 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method according to claim 7, wherein liquid film is placed between the substrate portion and the prism member.
Claim 12
Dependent Claim
28 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method according to claim 8, wherein prism member is immersed in medium liquid.
Claim 13
Independent Claim
54 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method according to any one of claims 1, 2, 3, 7, 8 and 9, wherein hologram film is placed on the surface of the prism which is placed in close contact with the surface of the optical waveguide portion.
Claim 14
Independent Claim
36 words
An apparatus for measuring cross-sectional distribution of refractive index of an optical waveguide by RNF method according to any one of claims 1, 2, 3, 7, 8 and 9, wherein prism member is a triangular prism.
References Cited (Backward Citations)
US5125740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-17 | 1997-07-19 | 1998-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-17 | 2001-07-19 | 2002-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-17 | 2005-07-19 | 2006-01-18 | $7700.00 | Window Closed / Lapsed |