Coolerless pump wavelength optimization for Er/Yb-doped optical fiber amplifiers
AssigneeJDS Uniphase Corporation
InventorsStuart MacCormack, David Giltner, Ying Hua Zhang
Life of this patent
Estimating the term…
Abstract
An optical fiber amplifier has a pump module operating at a shorter wavelength at room temperature than conventional optical fiber amplifiers. At the maximum operating case temperature, the output from the pump module is still at a lower wavelength than the upper absorption band edge of the optical fiber. In a further embodiment, an Er—Yb co-doped optical fiber is further doped with aluminum to flatten a portion of the optical absorption profile. Co-doping with aluminum reduces the sensitivity of optical amplifier output to wavelength drift of the pump module when pumped near the secondary peak.
Claims19
An optical amplifier comprising:
- a pump laser module having a first pump wavelength at room temperature and a second pump wavelength at a highest operating temperature of the optical amplifier, the pump laser module being configured to optically couple the pump output to
- an optical amplifier fiber having an upper wavelength atomic absorption band edge, the second pump wavelength being less than the upper wavelength atomic absorption band edge.
An optical amplifier comprising:
- a pump laser module providing a pump output at a first output wavelength of less than 965 nm at 20° C., and a second output wavelength at a temperature of 70° C., the pump laser module being configured to optically couple the pump output to an optical amplifier fiber having an upper wavelength atomic absorption band edge between about 970-980 nm, wherein the second output wavelength is less than the upper wavelength atomic absorption band edge.
An optical amplifier comprising:
- a pump laser module providing pump output at
- a first output wavelength between about 951-961 nm at a first case temperature of 20° C., and at
- a second output wavelength at a second case temperature of 70° C., the pump laser module being configured to optically couple the pump output to
- an optical amplifier fiber having an upper wavelength absorption band edge, wherein the second output wavelength is less than the upper wavelength absorption band edge of the optical amplifier fiber.
An optical amplifier fiber comprising:
- SiO2;
- Yb2O3;
- Er2O3;
- Al2O3;
- and
- P2O5, the optical amplifier fiber having an absorption peak between about 970-980 nm and a normalized absorption of at least 20% of the absorption peak from at least about 940 to about 970 nm.
A silica-based optical amplifier fiber comprising:
- at least 1.5 weight % Yb2O3;
- at least 0.05 weight % Er2O3;
- at least 4.5 weight % Al2O3;
- and
- at least 4.5 weight % P2O5.
A silica-based optical amplifier fiber comprising:
- at least 0.5 weight % Yb2O3;
- between 0.05-0.5 weight % Er2O3;
- greater than 0.1 weight % Al2O3;
- and
- sixteen weight % P2O5.
Dependencies are inferred from the claim text.