Amplification optical fiber and fiber optic amplifier...

Details Amplification optical fiber and fiber optic amplifier... Amplification optical fiber and fiber optic amplifier...

2005-03-08

2005-03-08

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Optical fiber

Reexamination Certificate

active

06865019

ABSTRACT:
The invention relates to an amplification optical fiber that is suitable for amplification of signals in the L-band, that has the effect of suppressing normal four-wave mixing (FWM) occurring between signals, and that has the structure for effectively suppressing occurrence of non-degenerative FWM as well, and a fiber optic amplifier including the same. A fiber optic amplifier according to the present invention incorporates an amplification optical fiber having a core region doped with a rare earth element, a zero-dispersion wavelength of not more than a wavelength of pumping light, and an effective cutoff wavelength of 1.1 μm or more but not more than the wavelength of the pumping light. Not only the normal FWM but also the non-degenerative FWM is effectively suppressed by application of the amplification optical fiber.

REFERENCES:
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patent: 6684016 (2004-01-01), Kim et al.
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patent: 2001255563 (2001-09-01), None
patent: 2002162529 (2002-06-01), None
patent: WO 0074184 (2000-07-01), None
Jun-ichi Kani, et al., “Nonlinear Optical Effects and Their Suppression Techniques in Ultra Wide-Band WDM Transmission Systems,” 1998, NTT Optical Networks Systems Laboratories, p. 566.
G.P. Agrawal, “Nonlinear Fiber Optics,” Second Edition, Academic Press, pp. 34-36, 1995.

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