Double-cladding-layer photon optical fiber

Abstract

The invention proposes a double-clad photonic fiber (2), which has a core (4), a first cladding (6) surrounding the core, and a second cladding (6) surrounding the first cladding. 8), there is at least one hole (10) in the core, and in the core, it is also possible that the first cladding is doped with rare earth ions. The signal light of the double-clad optical fiber obtained by the present invention and the pump light injected into the fiber core have good overlap. By injecting signal light into the fiber core and pumping light into the first cladding, the invention improves the amplification overlap coefficient of the double-cladding optical amplifier.

Description

Technical field [0001] The invention relates to the field of optical fiber transmission, and particularly relates to a double-clad photonic fiber used for optical amplification of signals. Background technique [0002] For optical fibers, the refractive index curve is usually used to quantitatively describe the refractive index curve, that is, the function graph of the refractive index change with the refractive index fiber radius. According to the traditional method, the abscissa represents the radius r from the center of the fiber, and the ordinate represents the difference between the refractive index and the refractive index of the fiber cladding. Therefore, the refractive index profile with a stepped shape, a trapezoidal shape, or a triangle shape is called a "stepped shape", a "trapezoidal shape", or a "triangle shape". These curves are usually theoretical or standard representations of optical fibers. The limitation on fiber manufacturing will cause the curve shape to be o...

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