Optical fiber-to-fiber evanescent field coupler

Details Optical fiber-to-fiber evanescent field coupler Optical fiber-to-fiber evanescent field coupler

1979-02-14

1981-04-28

Levy, Stewart J.

350 9616, G02B 514

Patent

active

042641268

ABSTRACT:
A single-mode or multimode, optical, fiber-to-fiber coupler which couples such fibers together so that an optical beam guided by one fiber is coupled to the other fiber through evanescent field coupling. In coupling fibers together, the plastic coating is removed along a desired length of each fiber. The fibers are twisted or braided together and cladding is etched to a desired diameter in a suitable housing. After etching, the etchant is drained and the fibers and inside of the housing are cleaned by any suitable cleaning solution. Subsequent to cleaning, the housing is filled with a solution or material which has an index of refraction which is less than that of the core. It has been determined that coupling efficiency can be controlled simply by adusting the tension of the coupling fibers.

REFERENCES:
patent: 4054366 (1977-10-01), Barnoski et al.
patent: 4087156 (1978-05-01), Kao et al.
patent: 4136929 (1979-01-01), Suzaki
patent: 4165150 (1979-08-01), Duck et al.

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