Optical fiber amplifier doped with dysprosium ion for the 1.3 .m

Details Optical fiber amplifier doped with dysprosium ion for the 1.3 .m Optical fiber amplifier doped with dysprosium ion for the 1.3 .m

1993-03-26

1994-06-14

Lee, John D.

Coherent light generators

Optical fiber laser

359341, 385142, H01S 314

Patent

active

053217080

ABSTRACT:
A core of a fluorozirconate optical fiber is doped with rare earth ions, namely trivalent Dy ions. The Dy ion makes an absorption transition with excitation light generated by an 800 nm semiconductor laser module. Then the Dy ion undergoes transitions, namely a nonradiative transition involving phonon emission, a transition to a metastable excited level, and a radiative transition wherein radiation corresponding to the 1.28 .mu.m to 1.35 .mu.m range occurs, thereafter returning to its ground state level. The Dy ion having an electrovalence of three can be pumped with a high-output 800 nm semiconductor laser module and is not subject to saturation at a lower energy level of population inversion. Using an optical fiber of the invention, a higher gain is obtained in the region of 1.3 .mu.m telecommunications window.

REFERENCES:
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patent: 5042039 (1991-08-01), Edagawa et al.
patent: 5131069 (1992-07-01), Hall et al.
L. Cognolato et al., "Fabrication of an Active Optical Fibre by a Non-Aqueous Solution Doping Method and its Characterization", Journal of Materials Science Letters, vol. 9, No. 12, pp. 1395-1396 (Dec. 1990).
J. Ainslie et al., "The Absorption and Fluorescence Spectra of Rare Earth Ions in Silica-Based Monomode Fiber", Journal of Lightwave Technology, vol. 6, No. 2, pp. 287-292 (Feb. 1988).
S. Davey et al., "Rare Earth Doped Fluorozirconate Glasses for Fibre Devices", British Telecom Technology Journal, vol. 7, No. 1, pp. 58-68 (Jan. 1989).
Ohishi et al., "Pr.sup.3+ -doped Fluoride Fiber Amplifier Operating at 1.31 .mu.m", Optics Letters, vol. 16, No. 22, pp. 1747-1749, Nov. 15, 1991.
Miyajima et al., "38.2dB Amplification at 1.31 .mu.m and Possibility of 0.98 .mu.m Pumping in Pr.sup.3+ -doped Fluoride Fibre", Electronics Letters, vol. 27, No. 19, pp. 1706-1707, Sep. 12, 1991.
Brierley et al., "Amplification and Lasing at 1350nm in a Neodymium Doped Fluorozirconate Fibre", Electronics Letters, vol. 24, No. 7, pp. 438-439, Mar. 31, 1988.
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