All band amplifier

Optical: systems and elements – Optical amplifier – Raman or brillouin process

Reexamination Certificate

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Reexamination Certificate

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06876489

ABSTRACT:
A Raman amplifier apparatus includes an optical transmission line with an input to receive an optical signal, an output that passes the optical signal, a first Raman gain fiber and a second Raman gain fiber. A first WDM is positioned between the second Raman gain fiber and the output. A first set of pump wavelengths is input to the first WDM. A second WDM is positioned between the first and second Raman gain fibers. A second set of pump wavelengths is input to the second WDM. At least a portion of the first set of pump wavelengths are different than the second set of pump wavelengths. The first and second set of pump wavelengths propagate in the same direction.

REFERENCES:
patent: 5831754 (1998-11-01), Nakano
patent: 6081366 (2000-06-01), Kidorf et al.
patent: 6320884 (2001-11-01), Kerfoot et al.
H. Masuda, “Ultra Wide-Band Raman Amplification with a Total Gain-Bandwidth of 132 nm of Two Gain-Bands Around 1.5 μm,” ECOC '99, Nice, France, 2 pages, Sep. 1999.
E.M. Dianov, “Raman fiber amplifiers,” Fiber Optics Research Center at the General Physics Institute of the Russian Academy of Sciences, Moscow, Russia, 5 pages, © 1999.
A.K. Srivastava, et al., “System Margin Enhancement with Raman Gain in Multi-Span WDM Transmission,” Technical Digest, OFC '99, 3 pages, Friday Feb. 26, 1999.
PCT, Written Opinion, International Preliminary Examining Authority, 6 pages. International Application # PCT/US02/01806, Mar. 10, 2003.

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