US5069518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating a fiber optic coupler
Assignee: Japan Aviation Electronics Industry Ltd
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Filing: 1990-07-09
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Granted: 1991-12-03
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Expires: 2010-07-09
Abstract
Abstract A method for the fabrication of a fiber optic coupler includes a step of fusing together two optical fibers along their longitudinal sections by heating them and a step of stretching the two optical fibers independently of one another with different conditions of tension and/or temperature so that the difference in their propagation constants varies. A desired splitting ratio of the fiber optic coupler can easily be achieved by making the above-said difference in propagation constant vary in the stretching step.
Inventors
- 👤 Hiroyuki Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:49
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29331; G02B6/29332; G02B6/2804; G02B6/2821; G02B6/2835
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
47 words
A method of fabricating a fiber optic coupler, comprising the steps of; fusing together at least two optical fibers along their longitudinal sections by heating; and stretching said fused optical fibers independently of one another with different conditions so that the difference in their propagation constants varies.
Claim 2
Independent Claim
47 words
A method of fabricating a fiber optic coupler, comprising the steps of; fusing together at least two optical fibers along their longitudinal sections by heating; and stretching said fused optical fibers independently of one another with different conditions so that the difference in their propagation constants varies.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein said stretching step includes a step of stretching said two optical fibers with different magnitudes of tension.
Claim 4
Dependent Claim
21 words
The method of claim 1, wherein said stretching step includes a step of heating said two optical fibers at different temperatures.
Claim 5
Dependent Claim
77 words
The method of claim 1, 2 or 3 further including the steps of: measuring a splitting ratio of said fiber optic coupler by applying light of a predetermined wavelength to one end of one of said two optical fibers after said fibers have been fused together; and comparing said measured splitting ratio and a preset value and, when the difference therebetween is smaller than a predetermined value, stopping said stretching and heating of said two optical fibers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |