Coherent light generators – Optical fiber laser
Reexamination Certificate
2005-07-05
2005-07-05
Harvey, MinSun OH (Department: 2828)
Coherent light generators
Optical fiber laser
C372S070000, C372S071000
Reexamination Certificate
active
06914915
ABSTRACT:
A laser amplifier includes a gain medium of a glass fiber, a first exciting light source, a second exciting light source, and another first exciting light source. The gain medium of the glass fiber includes rare earth dopant in a host medium. Ions of the rare earth dopant has an energy level structure including a ground level and a pair of laser upper level and laser lower levels between which a stimulated transition is to be produced after production of a population inversion between the pair of laser upper and laser lower levels. The pair of laser upper and laser lower levels being higher than the ground level. The first exciting light source is coupled to the input side of the glass fiber for introducing first exciting light to the glass fiber to produce the population inversion. The second exciting light source is coupled to the input side of the glass fiber for introducing second exciting light source to the glass fiber to raise ions of the rare earth dopant from the ground level to the laser lower level. The second exciting light has a wavelength band different from a wavelength band of the first exciting light. The other first exciting light source is coupled to the output side of the glass fiber for introducing the first exciting light to the glass fiber. A two-way excitation is performed on the glass fiber.
REFERENCES:
patent: 5930029 (1999-07-01), Mehuys
patent: 6205164 (2001-03-01), Ohishi et al.
patent: 2688303 (1997-08-01), None
patent: 10163554 (1998-06-01), None
patent: 2000307176 (2000-11-01), None
U.S. Appl. No. 09/527,421, filed Mar. 17, 2000, Tadashi Kasamatsu.
T. Kasamatsu, “1.50-μm-Band Gain-Shifted Thulium-Doped Fiber Amplifier With 1.05- and 1.56-μm Dual-Wavelength Pumping”,Optics Letters, vol. 24, No. 23, Dec. 1, 1999, pp. 1684-1686.
H. Masuda, et al., “Wideband Erbium-Doped Fibre Amplifiers With Three-Stage Amplification”,Electronics Letters, vol. 34, No. 6, Mar. 19, 1998, pp. 567-568.
M. Yamada, et al., “Gain-Flattened Broadband Er3+-Doped Silica Fibre Amplifier With Low Noise Characteristics”,Electronics Letters, vol. 34, No. 18, Sep. 3, 1998, pp. 1747-1748.
Dickstein, Shapiro, Morin & Oshinsky L.L.P.
Harvey MinSun Oh
Jackson C H
NEC Corporation
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