Fiber optic coupling filter and amplifier
US5067789A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1991 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Feb 14, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/04
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.