| abstract |
The present invention provides an optical fiber having a cladding doped with a first element, which is a rare earth element, and a core including a second element to induce a nonlinear Raman phenomenon, and an optical fiber amplifier using the same. In the optical fiber of the present invention, pump light propagating through the core is amplified into the first band by the rare earth element of the cladding, and Raman amplified into the second band by the second element.n n n n Fiber amplifier, rare earth, Raman, |