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An optical waveguide fiber amplifier comprising a core region comprises at least in part between 1300 wt.ppm and 3600 wt.ppm Er 2 O 3 , between 6.0 wt. % to 10.0 wt. % Al 2 O 3 and between 9.0 wt. % and 20.0 wt. % GeO 2 . The amplifier also comprising an inner clad surrounding the core region a

An optical waveguide fiber amplifier comprising a core region comprises at least in part between 1300 wt.ppm and 3600 wt.ppm Er 2 O 3 , between 6.0 wt. % to 10.0 wt. % Al 2 O 3 and between 9.0 wt. % and 20.0 wt. % GeO 2 . The amplifier also comprising an inner clad surrounding the core region and an outer clad surrounding the inner clad. The relative refractive index percentages and radii of the core region, inner clad and outer clad are chosen from the following ranges: the relative refractive index percent of the core segment within the range of from about 0.5% to about 2.0%; the relative refractive index percent of the inner clad within the range of from about 0.0% to about 0.4%; the outer radius of the core region within the range of from about 0.7 μm to about 1.5 μm; and, the outer radius of the inner clad within the range of from about 4.3 μm to about 18.8 μm.

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1. An optical waveguide fiber, comprising:a core region having a relative refractive index percent and an outer radius, the core region at least in part comprising Er 2 O 3 within a range of from about 1300 wt.ppm to about 3600 wt.ppm, Al 2 O 3 within a range of from about 6.0 wt. % to about 10.

1. An optical waveguide fiber, comprising:a core region having a relative refractive index percent and an outer radius, the core region at least in part comprising Er 2 O 3 within a range of from about 1300 wt.ppm to about 3600 wt.ppm, Al 2 O 3 within a range of from about 6.0 wt. % to about 10.0 wt. % and GeO 2 within a range of from about 9.0 wt. % to about 20.0 wt. %;an inner clad surrounding the core region and having a relative refractive index percent and an outer radius; andan outer clad surrounding the inner clad and having a relative refractive index percent;wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad are chosen from the following ranges:the relative refractive index percent of the core segment within the range of from about 0.5% to about 2.0%;the relative refractive index percent of the inner clad within the range of from about 0.0% to about 0.4%;the outer radius of the core region within the range of from about 0.7 μm to about 1.6 μm; andthe outer radius of the inner clad within the range of from about 4.3 μm to about 18.8 μm. 2. The fiber of claim 1, wherein the amount of Er 2 O 3 within the core region is within the range of from about 1950 wt.ppm to about 3100 wt.ppm. 3. The fiber of claim 1, wherein the amount of Al 2 O 3 within the core region is within the range of from about 6.5 wt. % to about 9.5 wt. %. 4. The fiber of claim 1, wherein the amount of GeO 2 within the core region is within the range of from about 9.0 wt. % to about 16.0 wt. %. 5. The fiber of claim 1, wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad, and the amounts of the Er 2 O 3 , Al 2 O 3 and GeO 2 in the core region are selected to provide a mode field diameter of greater than or equal to 5.2 μm at a wavelength of 1550 nm. 6. The fiber of claim 5, wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad, and the amounts of the Er 2 O 3 , Al 2 O 3 and GeO 2 in the core region are selected to provide a mode field diameter within the range of from about 5.2 μm to about 5.8 μm at a wavelength of 1550 nm. 7. The fiber of claim 1, wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad, and the amounts of the Er 2 O 3 , Al 2 O 3 and GeO 2 in the core region are selected to provide a peak absorption value of less than or equal to about 36 dB/m within a wavelength band of between about 1450 nm and about 1620 nm. 8. The fiber of claim 1, wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad, and the amounts of the Er 2 O 3 , Al 2 O 3 and GeO 2 in the core region are selected to provide a peak absorption value of less than or equal to about 27 dB/m within a wavelength band of between about 1450 nm and about 1620 nm. 9. The fiber of claim 1, wherein the fiber exhibits a polarization mode dispersion of less than or equal to about 5 fs/m at a wavelength of 1590 nm. 10. The fiber of claim 1, wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad, and the amounts of the Er 2 O 3 , Al 2 O 3 and GeO 2 in the core region are selected to provide a total background loss relative to absorption of less than or equal to about 2.5% at a wavelength of 1480 nm. 11. The fiber of claim 1, wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad, and the amounts of the dopants in the core region are selected to provide a cut-off wavelength of less than or equal to about 1400 nm. 12. The fiber of claim 11, wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad, and the amounts of the dopants in the core region are s elected to provide a cut-off wavelength of less than or equal to about 1350 nm. 13. The fiber of claim 12, wherein the relative refractive index percentages and radii of the core region, the inner clad and the outer clad, and the amounts of the dopants in the core region are selected to provide a cut-off wavelength of less than or equal to about 1000 nm. 14. The fiber of claim 1, wherein a gain is greater than or equal to about 19.5 dB for two adjacent input channels having about 100 GHz separation therebetween, and wherein a two-tone four-wave mixing conversion efficiency multiplied by an effective area of the fiber squared and divided by a length of the amplifier fiber squared, is less than or equal to about 0.01 mm 4 /m 2 . 15. An optical fiber communication system, comprising:an transmitter adapted to transmit an optical signal;an optical waveguide transmission fiber in optical communication with the transmitter;the optical waveguide fiber of claim 1 in optical communication with the optical waveguide transmission fiber;at least one optical pump in optical communication with the optical waveguide fiber amplifier and adapted to supply a pump radiation thereto; anda receiver adapted to receive the optical signal. 16. An optical waveguide fiber, comprising:a core region having a refractive index profile and at least in part comprising Er 2 O 3 within a range of from about 1300 wt.ppm to about 3600 wt.ppm, Al 2 O 3 within a range of from about 6.0 wt. % to about 10.0 wt. % and GeO 2 within a range of from about 9.0 wt. % and about 20.0 wt. %;an inner clad surrounding the core region and having a refractive index profile; andan outer clad surrounding the inner clad and having a refractive index profile;wherein the amounts of Er 2 O 3 , Al 2 O 3 and GeO 2 within the core region and the refractive index profiles of the core region, the inner clad and the outer clad are selected to provide a mode field diameter of greater than or equal to about 5.2 μm at a wavelength of 1550 nm. 17. The fiber of claim 16, wherein the amounts of Er 2 O 3 , Al 2 O 3 and GeO 2 within the core region and refractive index profiles of the core region, the inner clad and the outer clad are selected to provide a cut-off wavelength of less than or equal to about 1400 nm. 18. The fiber of claim 17, wherein the amounts of Er 2 O 3 , Al 2 O 3 and GeO 2 within the core region and refractive index profiles of the core region, the inner clad and the outer clad are selected to provide a cut-off wavelength of less than or equal to about 1350 nm. 19. The fiber of claim 16, wherein the amounts of Er 2 O 3 , Al 2 O 3 and GeO 2 within the core region and refractive index profiles of the core region, the inner clad and the outer clad are selected to provide a cut-off wavelength of less than or equal to about 980 nm. 20. The fiber of claim 16, wherein the fiber exhibits a polarization mode dispersion of less than or equal to about 5 fs/m at a wavelength of 1590 nm. 21. The fiber of claim 16, wherein the amounts of Er 2 O 3 , Al 2 O 3 and GeO 2 within the core region and refractive index profiles of the core region, the inner clad and the outer clad are selected to provide a peak absorption of less than or equal to about 36 dB/m within a wavelength band of between 1450 nm and 1620 nm. 22. The fiber of claim 16, wherein the amounts of Er 2 O 3 , Al 2 O 3 and GeO 2 within the core region and refractive index profiles of the core region, the inner clad and the outer clad are selected to provide a mode field diameter of less than or equal to about 5.8 μm at a wavelength of 1550 nm. 23. The fiber of claim 22, wherein the amounts of Er 2 O 3 , Al 2 O 3 and GeO 2 within the core region and refractive index profiles of the core region, the inner clad and the outer clad are selected to provide a mode field diameter within the range of about 5.2 μm to about 5.8 μm at a wavelength of 1550 nm. 24. The fiber of claim 1 6, wherein the amounts of Er 2 O 3 , Al 2 O 3 and GeO 2 within the core region and refractive index profiles of the core region, the inner clad and the outer clad are selected to provide an effective area of greater than or equal to about 20 μm 2 . 25. The fiber of claim 16, wherein the amount of Er 2 O 3 within the core region is within the range of from about 1950 wt.ppm to about 3100 wt.ppm. 26. The fiber of claim 16, wherein the amount of Al 2 O 3 within the core region is within the range of from about 6.5 wt. % to about 9.5 wt. %. 27. The fiber of claim 16, wherein amount of GeO 2 within the core region is within the range of from about 9.0 wt. % to about 16.0 wt. %. 28. The fiber of claim 16, wherein a gain is greater than or equal to about 19.5 dB for two adjacent input channels having about 100 GHz separation therebetween, and wherein a two-tone four-wave mixing conversion efficiency multiplied by a effective area of the fiber squared and divided by a length of the amplifier fiber squared, is less than or equal to about 0.01 mm 4 /m 2 .