Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2005-04-05
2005-04-05
Tarcza, Thomas H. (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
Reexamination Certificate
active
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.
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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.
Dewilde Carl
Freeman Michael
Islam Mohammed N.
Baker & Botts L.L.P.
Hughes Deandra M.
Tarcza Thomas H.
Xtera Communications Inc.
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