Optical fibres and glasses

Details Optical fibres and glasses Optical fibres and glasses

1979-12-20

1981-06-30

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Alkali metal silicate containing

65 3A, 106 47Q, 106 50, 106 54, 350 9634, C03C 308, C03C 1300, G02B 514

Patent

active

042759510

ABSTRACT:
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.

REFERENCES:
patent: 3822120 (1974-07-01), Koizumi et al.
patent: 3841882 (1974-10-01), Wolf
patent: 3853384 (1974-12-01), Pinnow
patent: 3859103 (1975-01-01), Yoshiyagawa et al.
patent: 3938974 (1976-02-01), Macedo
patent: 3957342 (1976-05-01), Newns et al.
patent: 4040807 (1977-08-01), Midwinter et al.
patent: 4057320 (1977-11-01), Marcatilli
patent: 4094689 (1978-06-01), Van Ass et al.
patent: 4177319 (1979-12-01), Jahn
patent: 4179188 (1979-12-01), Geckeler
Van Ass, H. M. J. M. et al. "Preparation of Graded-Index Optical Glass Fibres in the Alkali Germanosilicate System" Electronics Letters vol. 12, No. 15, Jul. 1976, pp. 369-370.
Koizumi, K. et al. "New Light-Focusing Fibers Made by a Continuous Process" Applied Optics vol. 13, No. 2, Feb. 1974, pp. 255-260.
Uchida, T. et al. "Optical Characteristics of a Light-Focusing Fiber Guide and its Applications " IEEE J. of Quantum Electronics, vol. QE-6, No. 10, Oct. 1970, pp. 606-612.
Inoue, T. et al. "Low-loss Light-Focusing Fibres Manufactured by Continuous Process" Proc of the IEE, vol. 123, No. 6, Jun. 1976, pp. 577-580.

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