US4863237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatments for optical fibre preforms
Assignee: British Telecommunications PLC
•
Filing: 1988-01-04
•
Granted: 1989-09-05
•
Expires: 2008-01-04
Abstract
Abstract Halide fibers are protected by coatings up to 2μm thick of chalcogenide glasses, e.g. glasses based on compounds of S, Se or Te with Ge or As. The coatings are deposited on the fiber preform by ion deposition sputtering. Preferably the preform is etched by directing a stream of inert ions at it. Most suitably the etching immediately precedes the coating.
Inventors
- 👤 Paul W. France
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:01
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/041; C03C13/042; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/018; C03B37/01807; C03C13/043; C03C25/00; C03C25/10; C03C25/12; C03C25/22; C03C25/226; C03B2201/00; C03B2201/80; C03B2201/82; C03B2201/86; C03B2201/88
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
27 words
A halide glass optical fibre having a barrier coating of chalcogenide glass on its surface, said barrier coating having a thickness of not more than 2 μm.
Claim 2
Dependent Claim
27 words
A halide glass optical fibre having a barrier coating of chalcogenide glass on its surface, said barrier coating having a thickness of not more than 2 μm.
Claim 3
Dependent Claim
14 words
A fibre according to claim 1, wherein the thickness is 0.1 to 500 nm.
Claim 4
Dependent Claim
14 words
A fibre according to claim 2, wherein the thickness is 2 to 100 nm.
Claim 5
Dependent Claim
40 words
A fibre according to claim 1, in which the fibre comprises a core of one fluoride glass composition and a cladding of a different fluoride glass composition, both compositions comprising fluorides of Zr, Ba, La, Al, Na, Li and Pb.
Claim 6
Dependent Claim
31 words
A fibre according to claim 1, wherein the chalcogenide glass is based on compounds of at least one of S, Se and Te with at least one of Ge and As.
Claim 7
Dependent Claim
40 words
A fibre according to claim 2, in which the fibre comprises a core of one fluoride glass composition and a cladding of a different fluoride glass composition, both compositions comprising fluorides of Zr, Ba, La, Al, Na, Li and Pb.
Claim 8
Dependent Claim
40 words
A fibre according to claim 3, in which the fibre comprises a core of one fluoride glass composition and a cladding of a different fluoride glass composition, both compositions comprising fluorides of Zr, Ba, La, Al, Na, Li and Pb.
Claim 9
Dependent Claim
31 words
A fibre according to claim 2, wherein the chalcogenide glass is based on compounds of at least one of S, Se and Te with at least one of Ge and As.
Claim 10
Dependent Claim
31 words
A fibre according to claim 3, wherein the chalcogenide glass is based on compounds of at least one of S, Se and Te with at least one of Ge and As.
Claim 11
Dependent Claim
31 words
A fibre according to claim 4, wherein the chalcogenide glass is based on compounds of at least one of S, Se and Te with at least one of Ge and As.
Claim 12
Dependent Claim
47 words
A fibre preform which comprises a core precursor of one halide glass composition and a cladding precursor of a different halide glass composition, said preform having a barrier coating of chalcogenide glass on its surface, said barrier coating having a thickness of not more than 50 μm.
Claim 13
Dependent Claim
47 words
A fibre preform which comprises a core precursor of one halide glass composition and a cladding precursor of a different halide glass composition, said preform having a barrier coating of chalcogenide glass on its surface, said barrier coating having a thickness of not more than 50 μm.
References Cited (Backward Citations)
JPS5650307A
Cited
DE3101999A1
Cited
US4381141A
Cited
US4737012A
Cited
JPS5895265A
Cited
US4733940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |