Long wavelength optical fiber communication and sensing systems

Details Long wavelength optical fiber communication and sensing systems Long wavelength optical fiber communication and sensing systems

1985-09-20

1988-03-29

LaRoche, Eugene R.

350 9634, G02B 618

Patent

active

047339403

ABSTRACT:
Optical communication and sensing systems are disclosed which operate at long wavelengths, i.e., wavelengths greater than about 2 .mu.m, but less than or equal to about 11 .mu.m. Each of these systems includes an optical fiber having material, such as a metal halide glass, which is substantially transparent to long wavelength electromagnetic radiation. These optical fibers exhibit reduced microdeformation and macrobending losses, as well as low total dispersions, at the long wavelengths. In contrast to currently held beliefs, this is achieved by using fiber designs involving relatively small relative refractive index differences, which are readily manufacturable and which avoid undesirable crystallization at core-cladding interfaces.

REFERENCES:
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patent: 4504298 (1985-03-01), Yokota et al.
K. Petermann, "Theory of Microbending Loss in Monomode Fibres with Arbitrary Refractive Index Profile," Arch. Elektron. Uebertragungstech., vol. 30, No. 9, 1976, pp. 337-342.
D. Marcuse, "Microdeformation Losses of Single-Mode Fibers," Applied Optics, vol. 23, No. 7, Apr. 1, 1984, pp. 1082-1091.
L. Jeunhomme, "Single-Mode-Fibre Design for 4 .mu.m Band Operation," Electronics Letters, vol. 17, No. 16, Aug. 6, 1981, pp. 560-561.
K. C. Byron et al, "Preliminary Calculations on Dispersion Effects in Infrared Transmitting Materials," Glass Technology, vol. 24, No. 3, Jun. 1983, pp. 146-148.
Y. Ohishi et al, "Fabrication of Fluoride Glass Single-Mode Fibers," Journal of Lightwave Technology, vol. LT-2, No. 5, Oct. 1984, pp. 593-596.

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