Multimode fiber
AssigneeDraka Comteq B.V.
InventorsDenis Molin, Yves Lumineau, Pierre Sillard, Ralph Petrus Johannes Adrianus Van Lankveld, Koen de Jongh
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Abstract
A multimode optical fiber comprises a central core having an alpha profile, a depressed cladding having a portion in continuity with the alpha profile of the central core and a stepped portion, and an outer cladding. The alpha profile is obtained by co-doping at least two dopants. The variation in concentration of each dopant and its derivative in relation to the fiber radius are continuous. A multimode fiber for Ethernet optical system with an improved bandwidth is thus obtained.
Claims17
A multimode optical fiber, comprising from the center to the periphery:
- a central core having an alpha profile;
- a depressed cladding having a portion in continuity with the alpha profile of the central core and a stepped portion;
- and
- an outer cladding;
- wherein the alpha profile and the portion in continuity with the alpha profile are obtained by co-doping with at least two dopants, the variation in concentration of each dopant and its derivative in relation to the fiber radius being continuous with respect to the fiber radius.
A multimode optical fiber, comprising:
- a central core positioned within an outer cladding, the central core having an alpha profile;
- and
- a depressed cladding immediately surrounding the central core and positioned within the outer optical cladding, the depressed cladding having (i) an inner portion in continuity with the alpha profile of the central core and (ii) a stepped, outer portion;
- wherein the central core and the depressed cladding's inner portion each comprise silica doped with a first dopant that increases the refractive index of silica and a second dopant that decreases the refractive index of silica;
- and
- wherein, as a function of fiber radius across the central core and the depressed cladding's inner portion, the variation in dopant concentration and its first derivative are continuous for both the first dopant and the second dopant.
Dependencies are inferred from the claim text.