Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2005-03-01
2005-03-01
Tarcza, Thomas H. (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S341320
Reexamination Certificate
active
06862132
ABSTRACT:
Systems and methods for ameliorating double Rayleigh backscattering induced impairments are provided. Raman amplification is divided among two or more stages. Optical energy from a single counter-propagating pump may traverse multiple stages while optical energy at the frequency of the signal to be amplified is permitted to propagate in the forward direction only. In this way the pump power can be effectively distributed over the entire amplifier length. The scheme may be implemented in a simple configuration employing a closed circulator and a fiber Bragg grating. Multiple wavelength pump operation may be accommodated as well as either discrete or distributed Raman amplification.
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Casaccia Emilio
Di Pasquale Fabrizio
Grasso Giorgio
Cisco Technology Inc.
Hughes Deandra M.
Ritter Lang & Kaplan LLP
Tarcza Thomas H.
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