Patent EP0041864A2 successfully refreshed from Google Patents.
EP0041864A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Long wavelength, low-loss optical waveguide
Assignee: Corning Glass Works
•
Filing: 1981-06-09
•
Granted: —
•
Expires: 2001-06-09
Abstract
Abstract An optical fibre waveguide is disclosed of the type comprising an outer cladding layer, an axially disposed core of SiO 2 doped with GeO 2 and a first inner cladding layer of SiO 2 doped with an oxide such as P 2 O 5 for lowering the preform processing temperature. A second inner cladding layer of pure Si0 2 is disposed between the first inner cladding layer and the core to prevent P 2 O 5 from diffusing into the core, thereby eliminating absorption losses from the P-O-H band in the 1.1-1.8 µm region.
Inventors
- 👤 Paul Edward Blaszyk
- 👤 Robert Olshansky
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 22:21
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03694; C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/018; C03B37/01807; C03C; C03C13/00; C03C13/04; C03C13/045; G02B6/03616; G02B6/03638; G02B6/03644; G02B6/10; G02B6/102; C03B2201/00; C03B2201/02; C03B2201/06; C03B2201/08; C03B2201/10; C03B2201/12; C03B2201/20; C03B2201/28; C03B2201/30; C03B2201/31; C03B2203/00; C03B2203/10; C03B2203/22; C03B2203/23
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
An optical fibre waveguide comprising a first glass cladding layer, a second glass cladding layer disposed on the inner wall surface of the first layer, the softening temperature of the second layer being less than that of the first layer, an axially disposed core of SiO 2 doped with an oxide to increase the refractive index thereof, the dopant being such that the core glass exhibits relatively low attenuation losses at wavelengths between 1.1 and 1.8 µm, characterised in that the optical fibre waveguide also comprises a third layer of pure Si0 2 disposed between the second glass cladding layer and the core, the refractive index of the SiO 2 layer being equal to or less than that of the second cladding layer.
Claim 2
Dependent Claim
123 words
An optical fibre waveguide comprising a first glass cladding layer, a second glass cladding layer disposed on the inner wall surface of the first layer, the softening temperature of the second layer being less than that of the first layer, an axially disposed core of SiO 2 doped with an oxide to increase the refractive index thereof, the dopant being such that the core glass exhibits relatively low attenuation losses at wavelengths between 1.1 and 1.8 µm, characterised in that the optical fibre waveguide also comprises a third layer of pure Si0 2 disposed between the second glass cladding layer and the core, the refractive index of the SiO 2 layer being equal to or less than that of the second cladding layer.
Claim 3
Dependent Claim
19 words
An optical fibre waveguide according to claim 1, wherein the core comprises SiO 2 doped with Ge0 2 .
Claim 4
Dependent Claim
27 words
An optical fibre waveguide according to claim 1 or 2, wherein the minimum thickness of the third layer is about 1.5 times the radius of the core.
Claim 5
Dependent Claim
64 words
An optical fibre waveguide according to claim 3, wherein the radius a of the core and the concentration of GeO 2 in said core are such that the quantity wherein γ is the wavelength of the propagated light and n 1 and n 2 are the refractive indices of the core and cladding respectively is less than 2.4 at wavelengths greater than 1.1 µm.
Claim 6
Dependent Claim
35 words
An optical fibre waveguide according to any of claims 1 to 4, wherein the second cladding layer comprises SiO 2 doped with P 2 O 5 , B 2 O 3 or a combination thereof.
Claim 7
Dependent Claim
34 words
An optical fibre waveguide according to any of claims 1 to 4 wherein the second glass cladding layer comprises SiO 2 doped with P 2 O 5 and B 2 0 3 and/or F.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.