Optical fiber filter for suppression of amplified spontaneous emission

• Main Authors: BISE, RYAN TYLER, YAN, MAN FEI, FINI, JOHN MICHAEL
• Format: Patent
• Language: English; French; German
• Published: 13.12.2006
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

An optical fiber filter for removing light of at least one predetermined noise wavelength from a fiber core comprises a length of optical fiber comprising a core region having a first refractive index value denoted n core , a cladding region surrounding the core region, said cladding region having a second refractive index value denoted n clad , where n clad < n core , and at least one high refractive index cladding feature disposed within the cladding region having a third refractive index value denoted n hi , where n hi > n clad , the various refractive index values, size and location determining the at least one predetermined noise wavelength to be filtered from the fiber core where mode mixing between the core mode and cladding mode occurs when the effective index of the core mode substantially matches the effective index of the cladding mode. The at least one high index feature comprises a plurality of high index features disposed at predetermined locations with respect to the core region.