Patent ID: 8755642
Filing Date: 2014-06-17
Classification: C03C,G02B,G02F,H01S

Abstract:
1. A fiber-optic device having input and output and comprising: at least one pump laser source; at least one first rare-earth doped optical fiber having a material composition enabling amplification of light passing therethrough; at least one all-fiber optical isolator including a second optical fiber having at least first, second, and third separated from one another sections, the first and third sections of the second optical fiber being associated with Faraday rotation and having respective cores with a first doping concentration of 55% (wt./wt.) to 85% (wt./wt.) of a first rare-earth oxide, and at least three magnetic cells each having a hollow, said at least three magnetic cells arranged in a sequence such that the same magnetic poles of immediately neighboring cells are facing one another, said first and third sections of the second optical fiber respectively disposed in the hollows of first and third magnetic cells that are separated by a second magnetic cell, wherein the fiber-optic device is an all-fiber fiber-optic device and a light-path of the fiber-optic device defined between the input and the output is devoid of a free-space region, immediately neighboring fiber-optic elements of the fiber-optic device being fusion-spliced together, wherein the second optical fiber includes a cladding having a second doping concentration of 55%-85% (wt./wt.) of a second rare-earth oxide, and wherein the second rare-earth oxide is selected from the group consisting of Pr2O3, Nd2O3, Pm2O3, Sm2O3, Eu2O3, Gd2O3, Tb2O3, Dy2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, La2O3, Ga2O3, Ce2O3, and Lu2O3, and a refractive index of the cladding is lower than a refractive index of the core.