Fiber optic coupling filter and amplifier

Details Fiber optic coupling filter and amplifier Fiber optic coupling filter and amplifier

1991-02-14

1991-11-26

Sikes, William L.

Optical waveguides

With optical coupler

Particular coupling function

385126, 385 15, 359341, G02B 626, G02B 642

Patent

active

050677896

ABSTRACT:
The disclosed fiber optic filter structure includes an optical fiber having a single-mode core surrounded by cladding material, and at least one light-attenuating light path in the cladding material uniformly spaced from the single-mode core. The propagation constants of the single-mode core and the light path are different at wavelengths except for at least one wavelength .lambda..sub.4. The spacing between the single-mode core and the light path are sufficiently small that light within a first band of wavelengths centered around .lambda..sub.f couples between the single-mode core and the light path. At least a portion of the light within the first band of wavelengths is absorbed in the light path. In that embodiment in which the single-mode core is a fiber amplifier gain core, the filtering function of the light path modifies the fiber amplifier gain spectrum.

REFERENCES:
patent: 4478489 (1984-10-01), Blankenship
patent: 4938556 (1990-07-01), Diggonet
patent: 4941726 (1990-07-01), Russell
patent: 4955025 (1990-09-01), Mears
patent: 4959837 (1990-09-01), Ferrier

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