09-05-2013 дата публикации
Номер: US20130114129A1
A single-mode optical fiber for guiding an optical signal, wherein the core region is capable of guiding an optical signal in a fundamental core mode at an optical signal wavelength. A cladding region is arranged to surround the core region and includes an inner cladding region and an outer cladding region. The inner cladding region includes a background material and a plurality of inner cladding features arranged in the background material, wherein a plurality of the plurality of inner cladding features are of a first type of feature that includes an air hole surrounded by a high-index region comprising a high-index material that is larger than the refractive index of the inner cladding background material. 163-. (canceled)64. A single-mode optical fiber for guiding an optical signal , said optical fiber having a longitudinal , optical axis and a cross section perpendicular thereto , said optical fiber comprising:{'sub': c', '1, 'a core region being capable of guiding an optical signal in a fundamental core mode with an effective refractive index, n, at an optical signal wavelength, λ;'}{'sub': b', 'r', '1', 'c', '1, 'a cladding region surrounding the core region, the cladding region comprising an inner cladding region and an outer cladding region, said inner cladding region comprising a background material having a refractive index, n, and a plurality of inner cladding features arranged in said background material, wherein at least a plurality of said plurality of inner cladding features are of a first type of feature, said first type of feature comprising an air hole surrounded by a high-index region comprising a high-index material having a refractive index, n, that is larger than the refractive index of the inner cladding background material, said first type of feature supports an optical mode with an effective refractive index, n, which is lower than or equal to the effective refractive index of the fundamental core mode, n, at said optical signal wavelength, ...
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