Optical waveguides having reduced bending loss and method of mak

Details Optical waveguides having reduced bending loss and method of mak Optical waveguides having reduced bending loss and method of mak

1991-05-02

1992-12-29

Healy, Brian

Optical waveguides

Optical fiber waveguide with cladding

385141, 385140, 65 311, 65 312, G02B 602, C03C 2502

Patent

active

051757850

ABSTRACT:
An optical waveguide that has low (0.16 to 0.28 db/km) attenuation but can be subjected to sharp radii of curvature of the order of 2 mm has an index of refraction difference between core and cladding of less than 0.75% and a cutoff wavelength that is 50 micrometers or more greater than the operating wavelength. The waveguide is a "virtual single mode" device, because even though a second order mode can be sustained in the waveguide, the waveguide length or bending losses, or both, differentially attenuates the second order mode so that the primary mode strongly predominates and both modal noise and attenuation are within acceptable limits.

REFERENCES:
patent: 4204745 (1980-05-01), Sakai et al.
patent: 4770494 (1988-09-01), Csencsits et al.
patent: 4838643 (1989-06-01), Hodges et al.
patent: 4877304 (1989-10-01), Bhagavatula
patent: 4973169 (1990-11-01), Slonecker
patent: 5032001 (1991-07-01), Shang

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