ACTIVE YTTERBIC CONE OPTICAL FIBER WITH FIBER INPUT OF PUMP RADIATION AND ALL-FIBER SCHEME OF AMPLIF

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FIELD : lighting engineering. SUBSTANCE : group of inventions relates to active optical fibers with all-fiber input of pump radiation into the first cladding. Cone optical fiber enhancing the optical radiation contains a core of quartz glass, doped with ions of rare-earth elements and additional dopants (for example, Ge, Al, P, F, B), taken together or separately, with the core diameter increasing along the length of the fiber. In addition, the fiber light guide contains at least one shell of quartz glass and a protective coating. Core refractive index is higher than the refractive index of a quartz glass shell, the refractive index of which is higher than the refractive index of the second shell (made from doped quartz glass or a polymer coating). EFFECT : technical result is the fabrication of a fiber-cone with a large threshold of non-linear effects for amplifying optical radiation in the spectral region of 1 mcm doped with ytterbium oxide and having a completely fiber input of pump radiation towards the amplified signal. 3 cl, 3 dwg