Optical transmission element having protective jacket to reduce attenuation
First Claim
1. In an optical transmission element of the type which is built up as a multi-layer fiber consisting of a core with a sheath surrounded by a protective jacket, the material of the sheath having a lower index of refraction than that of the core, the improvement comprising:
- (a) the inside diameter of the protective jacket being about twice the diameter of the fiber but in no case less than 50 μ
m larger than the latter;
(b) the protective jacket comprising a hard plastic material which is not crack prone and has a high modulus of elasticity whereby a smooth inside surface of the protective jacket is possible; and
(c) said protective jacket having a defined, preferably very small, absorption coefficient and a low index of refraction in the range of light wave length used.
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Abstract
An improved optical transmission element comprising an optical fiber made of a core and a sheath surrounded by a protective jacket in which the inside of the protective jacket is approximately twice the diameter of the fiber and in no case less than 50 μm larger than the fiber with its sheath, the protective jacket having on its inside a plurality of ribs maintaining it spaced from the sheath of the fiber thereby reducing absorption and radiation of the sheath light and avoiding attenuation in the optical transmission element.
20 Citations
8 Claims
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1. In an optical transmission element of the type which is built up as a multi-layer fiber consisting of a core with a sheath surrounded by a protective jacket, the material of the sheath having a lower index of refraction than that of the core, the improvement comprising:
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(a) the inside diameter of the protective jacket being about twice the diameter of the fiber but in no case less than 50 μ
m larger than the latter;(b) the protective jacket comprising a hard plastic material which is not crack prone and has a high modulus of elasticity whereby a smooth inside surface of the protective jacket is possible; and (c) said protective jacket having a defined, preferably very small, absorption coefficient and a low index of refraction in the range of light wave length used. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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- Resources
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Current AssigneeSiemens AG
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Original AssigneeSiemens AG
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InventorsOestreich, Ulrich
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Primary Examiner(s)Corbin, John K.
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Assistant Examiner(s)Lee, John D.
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Application NumberUS05/653,352Time in Patent Office1,048 DaysField of Search350/96 R, 350/96 WG, 350/96 LM, 350/ 96 BUS Class Current385/104CPC Class CodesG02B 6/4402 with one single optical wav...
