Optical fibers with preset stimulated backward Brillouin scatter

Details Optical fibers with preset stimulated backward Brillouin scatter Optical fibers with preset stimulated backward Brillouin scatter

1991-10-11

1992-12-08

Ullah, Akm E.

Optical waveguides

Optical fiber waveguide with cladding

G02B 600, G02B 636

Patent

active

051704579

ABSTRACT:
Optical fibers comprising a core region surrounding by a cladding region, and having a high stimulated backward Brillouin scattering threshold, P.sub.TH, for telecommunication transmission line application, or a low P.sub.TH for distributor sensor application are disclosed. By controlling the longitudinal and shear acoustic wave velocity profiles of an optical fiber such that V.sub.L,core >1.03 V.sub.L,cladding and V.sub.S,core >1.03 V.sub.S,cladding, where V.sub.L,core and V.sub.S,core are respectively the longitudinal and shear acoustic wave velocities of the core region, and V.sub.S,core and V.sub.S,cladding the longitudinal and shear acoustic wave velocities of the cladding region, the optical fiber will have a P.sub.TH higher than 20 milliwatts. For low P.sub.TH optical fibers, that is, with a P.sub.TH lower than 1 milliwatt, the longitudinal and shear acoustic wave velocity profiles of the fiber must be such that V.sub.L,core <0.97 V.sub.L,cladding and V.sub.S,core <0.97 V.sub.S,cladding. In both high and low P.sub.TH optical fibers, the refractive index of the core region is higher than that of the cladding region for optical wave guidance.

REFERENCES:
R. G. Smith, Applied Optics, vol. 11, No. 11, pp. 2489-2494, 1972.
D. Cotter, Journal of Optical Communications, vol. 4, No. 1, pp. 10-19, 1983.
J. Kushibiki et al., IEEE Trans. Sonics and Ultrason., vol. SU-32, No. 2, pp. 189-212, 1985.
A. Atalar, J. Appl. Phys., vol. 49, No. 10, pp. 5130-5139, 1978.

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