Rare-earth-doped fibre-optice device for the emission or amplification of a signal in the s-band
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A rare earth doping and device technology, which is applied to laser components, multi-layer core/cladding optical fibers, lasers, etc., to achieve the effect of flat gain
Inactive Publication Date: 2013-05-08
ALCATEL LUCENT SAS
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[0011] However, making the cavity resonant according to the photonic bandgap will likely reduce the natural shift in gain in the C-band
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[0039] exist figure 1 The cross-sectional view of shows a single-mode optical fiber according to one embodiment of the present invention, comprising a solid rare-earth doped core and possessing photonic bandgap guiding properties. A fiber 1 with radius r consists of a fiber with radius R and refractive index n c A solid core 2 made of silica doped with erbium ions or erbium nanoparticles. The core 2 is surrounded by an optical cladding layer comprising a first pair of layers comprising a first layer 3 and a second layer 4; the first layer 3 also consists of silica , and has a refractive index n strictly greater than the core refractive index 1 , so that n 1 >n c ; the second layer 4 is made of doped silica and has a refractive index n smaller than that of the first layer 2 , so that n 2 1 . The cover layer also includes a second pair of layers having the same properties, surrounding and similar to the first pair of layers, having a refractive index n 3 The first layer ...
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Abstract
Device for the emission or amplification of a signal, comprising an optical fibre (1) having a solid core (2) of refractive index nc, made of a silica glass doped with a rare earth, such as erbium, ytterbium or neodymium, said core being surrounded by an optical cladding (3, 4, 5, 6, 7, 8) comprising at least a pair of silica layers composed of a first, inner layer (3), having a refractive index greater than the refractive index nc of the core (2), covered by a second, outer layer (4). The optical fibre (1) comprises several pairs of silica layers (3, 4; 5, 6; 7, 8) around the core (2), each pair comprising an inner layer (3, 5, 7) of refractive index ni and an outer layer (4, 6, 8) of refractive index ne, the refractive index ne of the outer layer being lower that the refractive index ni of the inner layer of the same pair.
Description
technical field [0001] The present invention relates to a device comprising a silica-based optical fiber containing rare earth elements as dopants to emit in a wavelength range known as the "S" band (ie "short wave band") signal or amplified signal, the "S" band is meant to correspond to wavelengths less than about 1530 nm. [0002] The invention relates to a device for emitting or amplifying optical signals with rare earth doped optical fibers. Fiber amplifiers consist of amplifying fibers that operate on a principle known as stimulated emission, whereby by exciting a material via a high-energy light source such as a pump laser, the material can emit the same wavelength and phase as the transmitted light wave The wavelength of the pump laser light is smaller than the wavelength of the signal propagating in the fiber. The main amplifying element used is usually a rare earth element such as Erbium or Ytterbium, and usually acts as a dopant at or near the single-mode core of t...
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