US 8,509,574 B2 · Faraday rotator and isolator

Abstract

An all-fiber optic Faraday rotator and isolator is presented. The device has a multicomponent glass optical fiber having a core having a first doping concentration of 55%-85% (wt./wt.) of a first rare-earth oxide and a cladding having a section doping concentration of 55%-85% (wt./wt.) of a second rare-earth oxide, where the first rare-earth oxide and the second rare earth oxide are one or more of Pr2O3, Nd2O3, Pm2O3, Sm2O3, Eu2O3, Gd2O3, Tb2O3, Dy2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, La2O3, Ga2O3, Ce2O3, and Lu2O3, and where the refractive index of the cladding is lower than a refractive index of the core. The fiber optic device further includes multiple magnetic cells each formed to include a bore extending there through, where the fiber is disposed in the bore of one of the magnetic cells.

Claims22

Dependent claims

A fiber-optic device having a light path devoid of free-space regions, the fiber-optic device comprising:

a first multicomponent glass optical fiber comprising:
a core having a first doping concentration of 55%-85% (wt./wt.) of a first rare-earth oxide;
and
a cladding having a second doping concentration of 55%-85% (wt./wt.) of a second rare-earth oxide;
wherein:
the first rare-earth oxide and the second rare earth oxide are 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 less than a refractive index of the core;
and
a plurality of magnetic cells each formed to include a bore extending there through, wherein the first fiber is disposed in the bore of one of the plurality of magnetic cells.

7 more elements

A fiber-optic device having a light path devoid of free-space regions, the fiber-optic device comprising:

first and second multicomponent glass optical fibers, the first and second fibers each comprising:
a core having a first doping concentration of 55%-85% (wt./wt.) of a first rare-earth oxide;
and
a cladding having a second doping concentration of 55%-85% (wt./wt.) of a second rare-earth oxide;
wherein:
the first rare-earth oxide and the second rare earth oxide are 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 less than a refractive index of the core;
and
a plurality of magnetic cells each formed to include a bore extending there through, wherein the first fiber is disposed in the bore of one of the plurality of magnetic cells and the second fiber is disposed in the bore of another one of the plurality of magnetic cells.

7 more elements

A fiber-optic device having a light path devoid of free-space regions, the fiber-optic device comprising:

a first multicomponent glass optical fiber comprising:
a core having a first doping concentration of 55%-85% (wt./wt.) of a first rare-earth oxide;
and
a cladding having a second doping concentration of 55%-85% (wt./wt.) of a second rare-earth oxide;
wherein:
the first rare-earth oxide and the second rare earth oxide are 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 less than a refractive index of the core;
a plurality of magnetic cells each formed to include a bore extending there through, wherein the first fiber is disposed in the bore of one of the plurality of magnetic cells;
a first polarizer at a first port;
and
a second polarizer at a second port;
wherein a polarization of light transmitted through the fiber-optic device is rotated 40 to 50 degrees.

10 more elements

Dependencies are inferred from the claim text.

Faraday rotator and isolator

Life of this patent

Faraday rotator and isolator

Life of this patent

Abstract

Claims22