US5146534A
Expired / Lapsed
US
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SiO2 -based alkali-doped optical fiber
Assignee: Furukawa Electric North America Inc
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Filing: 1991-11-12
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Granted: 1992-09-08
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Expires: 2011-11-12
Abstract
Abstract It has been discovered that glass of composition xM 2 O.(1-x)SiO 2 can have lower intrinsic loss than pure SiO 2 , for 0<x≲0.03 and M=Na, K, and/or Rb. Furthermore, it has been discovered that co-doping with F can increase the range of reduced intrinsic loss to x˜0.07, for M=K and/or Rb. Disclosed is optical fiber that comprises the novel low intrinsic loss glass,, typically in the core.
Inventors
- 👤 Malcolm E. Lines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:12
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/018; C03B37/01807; C03C; C03C13/00; C03C13/04; C03C13/045; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/12; C03B2201/30; C03B2201/50; C03B2203/00; C03B2203/10; C03B2203/22; C03B2203/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A silica-based fiber that is a single mode fiber at a predetermined operating wavelength, the fiber comprising a core and a cladding contactingly surrounding the core, the core comprising at least 0.8 mole fraction SiO 2 , CHARACTERIZED IN THAT a) the core further comprises x mole fraction M 2 O, where M is selected from the group consisting of Na, K, Rb and combinations thereof, and O<x≲0.07; and b) associated with the core is an intrinsic loss at the operating wavelength that is lower than the intrinsic loss associated with the core of an otherwise identical comparison fiber whose core is essentially M-free.
Claim 2
Dependent Claim
104 words
A silica-based fiber that is a single mode fiber at a predetermined operating wavelength, the fiber comprising a core and a cladding contactingly surrounding the core, the core comprising at least 0.8 mole fraction SiO 2 , CHARACTERIZED IN THAT a) the core further comprises x mole fraction M 2 O, where M is selected from the group consisting of Na, K, Rb and combinations thereof, and O<x≲0.07; and b) associated with the core is an intrinsic loss at the operating wavelength that is lower than the intrinsic loss associated with the core of an otherwise identical comparison fiber whose core is essentially M-free.
Claim 3
Dependent Claim
27 words
Optical fiber according to claim 1, wherein M is selected from the group consisting of K, Rb, K and Rb, and wherein the core further comprises F.
Claim 4
Dependent Claim
19 words
Optical fiber according to claim 2, wherein the mole fraction of F is in the range 1.5x to 2.5x.
Claim 5
Dependent Claim
15 words
Optical fiber according to claim 1, wherein x≲0.03, and wherein the core is substantially F-free.
Claim 6
Dependent Claim
11 words
Optical fiber according to claim 1, wherein the cladding comprises F.
Claim 7
Dependent Claim
42 words
Optical fiber according to claim 5, wherein M is selected from the group consisting of K, Rb, and K and Rb, wherein the core consists essentially of Si, M, oxygen and fluorine, and the cladding consists essentially of Si, oxygen and fluorine.
Claim 8
Dependent Claim
13 words
Optical fiber of claim 1, wherein the operating wavelength is about 1.3 μm.
Claim 9
Dependent Claim
13 words
Optical fiber of claim 1, wherein the operating wavelength is about 1.5 μm.
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) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |