发明名称 |
IMPROVEMENTS IN OR RELATING TO OPTICAL FIBRES AND GLASSES |
摘要 |
A range of alkali metal borosilicate glass compositions modified by the addition of alkaline earth metal oxides has been found to be especially suitable for the production of graded index optical fibre by thermal diffusion using the double crucible method. A core glass chosen from this range may be paired with a suitable cladding glass so that, in the nozzle of the double crucible, alkaline earth metal exchange occurs to give a composition gradient of alkaline earth metal oxide and hence a gradation of refractive index. Using these glasses, fibres have been produced having refractive index profiles that approximate closely to the ideal parabolic distribution, numerical apertures of up to 0.21, and best loss values as low as 6.4 dB/km at 850 nm. |
申请公布号 |
DE2860976(D1) |
申请公布日期 |
1981.11.19 |
申请号 |
DE19782860976 |
申请日期 |
1978.06.28 |
申请人 |
THE POST OFFICE |
发明人 |
BEALES, KEITH JOHN;DUNCAN, WILLIAM JAMES;DUNN, ANTHONY GLADWYN;NEWNS, GEORGE REGINALD |
分类号 |
C03C3/089;C03C13/04;G02B6/028;(IPC1-7):C03C3/08;C03C13/00;G02B5/14 |
主分类号 |
C03C3/089 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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