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EP0109604A1
Expired / Lapsed
EP
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Polarised plane-maintaining optical fiber
Assignee: Hitachi Ltd
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Filing: 1981-01-09
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Granted: —
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Expires: 2001-01-09
Abstract
Abstract An optical fiber has the following cross-sectional structure: - a circular core 20, - a circular cladding 21 surrounding the core 20, - a first jacket 22 surrounding the cladding 21 and having an elliptical outer shape, and - a second jacket 23 surrounding the first jacket 22 and having a circular outer shape. The core 20 and the circular cladding 21, which has a lower refractive index than the core 20, together form the optical waveguide proper. Such an optical fiber enables maintaining the polarisation plane at low loss.
Inventors
- 👤 Hiroyoshi Matsumura
- 👤 Toshio Katsuyama
- 👤 Tsuneo Suganuma
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 07:00
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/105; C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; C03B37/01211; C03B37/01217; C03B37/014; C03B37/018; C03B37/01861; C03C; C03C13/00; C03C13/04; C03C13/045; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/10; C03B2203/00; C03B2203/10; C03B2203/12; C03B2203/22; C03B2203/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
An optical fiber having an optical waveguide (20, 21) and a jacket (22, 23) mounted on said waveguide (20, 21), characterized in that said waveguide comprises a circular core (20) and a circular cladding (21) having a refractive index lower than that of said core (20), and said jacket consists of a first jacket (22) having an elliptical outer shape and formed on said waveguide (20, 21) and a second jacket (23) having a circular outer shape and formed on said first jacket (22).
Claim 2
Dependent Claim
84 words
An optical fiber having an optical waveguide (20, 21) and a jacket (22, 23) mounted on said waveguide (20, 21), characterized in that said waveguide comprises a circular core (20) and a circular cladding (21) having a refractive index lower than that of said core (20), and said jacket consists of a first jacket (22) having an elliptical outer shape and formed on said waveguide (20, 21) and a second jacket (23) having a circular outer shape and formed on said first jacket (22).
Claim 3
Dependent Claim
30 words
The optical fiber of claim 1, characterized in that the refractive index of said first jacket (22) is not lower by more than 0.2% than that of said cladding (21).
Claim 4
Dependent Claim
64 words
The optical fiber of claim 2, characterized in that said core (20) consists of silica glass containing at least one of GeO 2 and P 2 O 3 , said cladding (21) consists of silica glass and said first jacket (22) consists of silica glass containing at least one of GeO 2 and P 2 O 5 , and B 2 0 3 .
References Cited (Backward Citations)
GB2012983A
Cited
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