Birefringent single-mode acoustic fiber

Details Birefringent single-mode acoustic fiber Birefringent single-mode acoustic fiber

1987-03-19

1988-05-03

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic bulk wave propagation means

333147, 333239, H03H 930

Patent

active

047423188

ABSTRACT:
A birefringent single-mode acoustic fiber for propagating linearly polarized shear acoustic waves while preserving linear polarization, comprises an elongated core region of a solid material in which acoustic waves can be propagated in two orthogonal shear mode components, and a cladding region enclosing all surfaces of the core region except end surfaces thereof, the cladding region being also of a solid material in which acoustic waves can be propagated in two orthogonal shear mode components. The core and cladding regions have different shear wave velocities with the shear wave velocity of the core region being lower than that of the cladding region, the core or cladding region being characterized by at least one birefringence causing factor selected from the group consisting of (a) noncircular geometry of the core region, (b) asymmetry of shear wave velocity distribution in the core region and (c) asymmetrical stress induced in the cladding region, whereby to strongly break degeneracy between the two orthogonal shear mode components and preserve linear polarization thereof throughout the fiber. The birefringent single-mode acoustic fiber according to the invention is particularly useful in acoustic fiber sensor systems for monitoring environmental changes in pressure, temperature, strain, stress, etc.

REFERENCES:
patent: 3406358 (1968-10-01), Seidel et al.
patent: 3605043 (1971-09-01), Bienvenu et al.
patent: 3736532 (1973-05-01), Armenakas
patent: 3824505 (1974-07-01), Borner
patent: 3922622 (1975-11-01), Boyd et al.
patent: 4077023 (1978-02-01), Boyd et al.

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