MULTI-CORE OPTICAL FIBER
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Abstract
The present invention relates to a multi-core optical fiber having a structure to effectively reduce crosstalk between adjacent core regions among a plurality of core regions. The multi-core optical fiber (1) has a leakage reduction portion (50), at least a portion of which is arranged at a position on a straight line connecting adjacent core regions together among a plurality of core regions (10). The leakage reduction portion (50) reduces leakage light in the multi-core optical fiber (1) from each of the core regions (10), thereby effectively reducing crosstalk between adjacent core regions.
238 Citations
15 Claims
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1-7. -7. (canceled)
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8. A multi-core optical fiber, comprising:
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a plurality of core fiber regions in a same cross-section, each of the core fiber regions comprising a core region extending along an optical axis, and a cladding region provided on an outer periphery of the core region; a leakage reduction portion provided on a straight line connecting the core regions in the adjacent core fiber regions, among the plurality of core fiber regions, wherein the multi-core optical fiber is a silica-based optical fiber, and the leakage reduction portion has a refractive index profile such that a confinement factor of propagating light in a region surrounded by the leakage reduction portion is raised. - View Dependent Claims (9, 10, 11)
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12. A multi-core optical fiber, comprising:
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a plurality of fiber parts in a same cross-section, each of the fiber parts comprising a core extending along an optical axis, an inner cladding provided on an outer periphery of the core, a refractive index lowered portion provided on an outer periphery of the inner cladding, and an outer cladding provided on an outer periphery of the refractive index lowered portion, wherein the core has a refractive index higher than those of the inner cladding, the refractive index lowered portion, and the outer cladding, and the refractive index lowered portion has a refractive index lower than those of the core, the inner cladding, and the outer cladding.
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13. A multi-core optical fiber, comprising:
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a plurality of core fiber regions in a same cross-section, each of the core fiber regions comprising a core region extending along an optical axis, and a cladding region provided on an outer periphery of the core region; a leakage reduction portion provided on a straight line connecting the core regions in the adjacent core fiber regions, among the plurality of core fiber regions; and a layer provided in the outside of the leakage reduction portion, the layer having a refractive index higher than that of the leakage reduction portion, wherein the leakage reduction portion has a refractive index profile such that a confinement factor of propagating light in a region surrounded by the leakage reduction portion is raised. - View Dependent Claims (14, 15)
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Specification