Long wavelength, low-loss optical waveguide

Details Long wavelength, low-loss optical waveguide Long wavelength, low-loss optical waveguide

1980-06-09

1983-05-31

Lee, John D.

350 9634, G02B 5172

Patent

active

043858023

ABSTRACT:
An optical fiber waveguide of the type comprising an outer cladding layer, an axially disposed core of SiO.sub.2 doped with GeO.sub.2 and a first inner cladding layer of SiO.sub.2 doped with an oxide such as P.sub.2 O.sub.5 for lowering the preform processing temperature. A second inner cladding layer of pure SiO.sub.2 is disposed between the first inner cladding layer and the core to prevent P.sub.2 O.sub.5 from diffusing into the core, thereby eliminating absorption losses from the P--O--H band in the 1.1-1.8 .mu.m region.

REFERENCES:
patent: 4114980 (1978-09-01), Asam et al.
patent: 4243298 (1981-01-01), Kao et al.
Kawachi et al., Electronics Letters, vol. 13, No. 15, Jul. 21, 1977, pp. 442-443, "Low-Loss Single-Mode Fibre at the Material-Dispersion . . . ".
Sentsui et al., Fifth European Conference on Optical Communication, Amsterdam, Sep. 1979, "Low Loss Monomode Fibers with P.sub.2 O.sub.5 -SiO.sub.2 . . . ".
Okada et al., Electronics Letters, vol. 14, No. 4, Feb. 16, 1978, pp. 89-90, "Improved Chemical Vapour Deposition Method . . . ".
Electronics Letters, 15(14), Jul. 1979, Ainslie et al., "Preparation of Long Lengths of Ultra-Low-Loss Single Mode Fibre", pp. 411-413.
Electronics Letters, 15(4), Feb. 1979, Miya et al., "Ultimate Low Loss Single-Mode Fibre at 1.55 .mu.m," pp. 106-108.
Electronics Letters, 15(10), May 1979, Edahiro et al., "Spectral Loss Characteristics . . . ," pp. 274-275.
Electronics Letters, 15(22), Oct. 1979, Edahiro et al., "Phosphor-Doped Silica Cladding V.A.D. Fibres," pp. 726-728.

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