Multiple core optical waveguide for secure transmission

Details Multiple core optical waveguide for secure transmission Multiple core optical waveguide for secure transmission

1981-07-31

1984-03-13

Lee, John D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340555, G02B 5172

Patent

active

044363680

ABSTRACT:
A glass optical fiber has multiple cores and a cladding. The index of refraction of all cores is greater than the index of refraction of the cladding and the index of refraction of a first core is greater then the index of refraction of a second core. The change in the ratio of light loss from the first and second cores is detected to identify perturbations of the optical fiber before it reaches a level sufficient for a secure signal to be tapped.

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patent: 4000416 (1976-12-01), Goell
patent: 4062618 (1977-12-01), Steensma
patent: 4070091 (1978-01-01), Taylor et al.
patent: 4134642 (1979-01-01), Kapron et al.
patent: 4217488 (1980-08-01), Hubbard

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