Multi-clad doped optical fiber
OwnerAndré Croteau, Yves Taillon +1inventors
InventorsAndré Croteau, Yves Taillon, Jocelyn Lauzon
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Abstract
The invention provides a multi-clad fiber, with three claddings or more, where at least one intermediate cladding is inserted between an inner core and an outer core of the multi-clad fiber, for enlarging the cross-section of the fiber core or for increasing the dopant density in the core. The invention also provides an intermediate cladding having a multi-layer structure to better confine the pump power in a suitable pumping region of the fiber.
Claims14
A triple-clad optical fiber for high power cladding-pumped fiber amplifiers and lasers, the triple-clad fiber comprising the following elements:
- a core doped to provide an amplification region;
- an inner cladding disposed around said core;
- an intermediate cladding disposed around said inner cladding and larger than said inner cladding for guiding pump power;
- and
- an outer cladding disposed around said intermediate cladding,
- and wherein:
- said inner cladding has a refractive index lower than a refractive index of said core and higher than a refractive index of said intermediate cladding allowing for a low numerical aperture of said core, and
- said outer cladding has a refractive index lower than the refractive index of said intermediate cladding allowing said pump power to be confined inside a volume limited by said outer cladding.
A multi-clad optical fiber, the fiber comprising:
- a core doped to provide an amplification region;
- an inner cladding disposed around said core;
- an intermediate multi-layer cladding structure having at least two layers, disposed around the inner cladding, for distributing a pump power between said layers, said inner cladding and said core, wherein the multi-layer structure comprises at least an inner layer, disposed directly around the inner cladding and an outer layer disposed at an outer boundary of the structure;
- an outer cladding disposed around the outer layer of the intermediate multi-layer cladding structure;
- and wherein:
- the inner cladding has a refractive index lower than a refractive index of the core and higher than a refractive index of the inner layer of the intermediate cladding structure, allowing for a low numerical aperture of the core, and
- the outer cladding has a refractive index lower than a refractive index of the outer layer of the intermediate multi-layer cladding structure, allowing said pump power to be confined inside a volume limited by said outer cladding.
Dependencies are inferred from the claim text.