Patent US4978201A successfully refreshed from Google Patents.
US4978201A
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US
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Method for measuring splice loss of an optical fiber
Assignee: Fujikura Ltd
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Filing: 1989-01-26
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Granted: 1990-12-18
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Expires: 2009-01-26
Abstract
Abstract In a method for estimating a splice loss of a spliced portion of a fusion-spliced optical fiber, an amount of axial deviation attained prior to or immediately after heating a pair of optical fibers and an amount of axial deviation attained upon completion of heat treatment on the optical fibers are first detected to provide a difference between the axial deviations, and a splice loss originated from an opposite-phase core distortion is estimated based on the difference between the axial distortions.
Inventors
- 👤 Takeshi Yamada
- 👤 Tsutomu Onodera
- 👤 Hiroyuki Taya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:10
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/255; G02B6/2555; G01; G01B; G01B11/00; G01B11/26; G01B11/27; G01B11/272; G01M; G01M11/00; G01M11/30; G01M11/37; G02B6/2551
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A method of estimating a splice loss of a spliced portion of an optical fiber formed by fusion-splicing a pair of optical fibers through heat treatment, which method comprises the steps of: detecting a first amount of axial deviation attained prior to or immediately after heating a pair of optical fibers; detecting a second amount of axial deviation attained upon completion of heat treatment on said optical fibers; determining a difference between said first and said second axial deviations; and measuring a splice loss originating from an opposite-phase core distortion based on said difference between said axial deviations.
Claim 2
Independent Claim
98 words
A method of estimating a splice loss of a spliced portion of an optical fiber formed by fusion-splicing a pair of optical fibers through heat treatment, which method comprises the steps of: detecting a first amount of axial deviation attained prior to or immediately after heating a pair of optical fibers; detecting a second amount of axial deviation attained upon completion of heat treatment on said optical fibers; determining a difference between said first and said second axial deviations; and measuring a splice loss originating from an opposite-phase core distortion based on said difference between said axial deviations.
Claim 3
Independent Claim
134 words
A method of estimating a split loss of a spliced portion of an optical fiber formed by fusion-splicing a pair of optical fibers through heat treatment, which method comprises the steps of: acquiring a splice loss from an amount of axial deviation upon completion of heat treatment on a pair of optical fibers, a splice loss from an amount of angular deviation upon completion of heat treatment on said optical fibers, and a splice loss originating from opposite-phase core distortion from a difference between a first amount of axial deviation attained prior to or immediately after heating said optical fibers and a second amount of axial deviation attained upon completion of heat treatment on said optical fibers; and determining an entire splice loss by adding said splice losses obtained in said splice-loss acquiring step.
Claim 4
Independent Claim
134 words
A method of estimating a split loss of a spliced portion of an optical fiber formed by fusion-splicing a pair of optical fibers through heat treatment, which method comprises the steps of: acquiring a splice loss from an amount of axial deviation upon completion of heat treatment on a pair of optical fibers, a splice loss from an amount of angular deviation upon completion of heat treatment on said optical fibers, and a splice loss originating from opposite-phase core distortion from a difference between a first amount of axial deviation attained prior to or immediately after heating said optical fibers and a second amount of axial deviation attained upon completion of heat treatment on said optical fibers; and determining an entire splice loss by adding said splice losses obtained in said splice-loss acquiring step.
Claim 5
Dependent Claim
35 words
The method according to claim 1, wherein said first and second amounts of axial deviation of said optical fibers are measured by observing an amount of deformation of a monitored image of said optical fibers.
Claim 6
Dependent Claim
39 words
The method according to claim 2, wherein said amounts of axial deviation of said optical fibers or said amount of angular deviation thereof is measured by observing an amount of deformation of a monitored image of said optical fibers.
Claim 7
Dependent Claim
37 words
The method according to claim 1, wherein at a time a plurality of single-mode optical fibers of a pair of ribbon type optical fibers are fusion-spliced together, a splice loss of said single-mode optical fibers is measured.
Claim 8
Dependent Claim
37 words
The method according to claim 2, wherein at a time a plurality of single-mode optical fibers of a pair of ribbon type optical fibers are fusion-spliced together, a splice loss of said single-mode optical fibers is measured.
Claim 9
Dependent Claim
37 words
The method according to claim 3, wherein at a time a plurality of single-mode optical fibers of a pair of ribbon type optical fibers are fusion-spliced together, a splice loss of said single-mode optical fibers is measured.
References Cited (Backward Citations)
US4179186A
Cited
US4274707A
Cited
US4557556A
Cited
US4557557A
Cited
US4636033A
Cited
US4679908A
Cited
US4659217A
Cited
US4736632A
Cited
US4708476A
Cited
US4812010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |