Optical fibres

Details Optical fibres Optical fibres

1980-10-29

1983-02-08

Gensler, Paul L.

65 312, 65 313, G02B 5172

Patent

active

043726488

ABSTRACT:
A secure optical fibre consists of an inner waveguiding structure surrounded by an outer waveguiding structure and separated therefrom by an optical absorbing layer (3) rendered absorbing by irradiation. The inner waveguiding structure comprises a core (1) surrounded by a lower refractive index cladding layer (2). The outer waveguiding structure comprises an annular core layer (5) sandwiched between lower refractive index inner and outer cladding layers (4 and 6).

REFERENCES:
patent: 4327965 (1982-05-01), Black
patent: 4334733 (1982-06-01), Takeshima et al.

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