Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2006-08-01
2006-08-01
Keith, Jack (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S337400, C359S337500
Reexamination Certificate
active
07085039
ABSTRACT:
A hybrid Raman-EDFA provides gain equalization over the C-band and L-band. The hybrid Raman-EDFA includes a Raman section producing a Raman gain and an EDFA section producing an EDFA gain complementing the Raman gain. The EDFA section preferably includes a highly inverted, single-stage EDFA to produce the complementing EDFA gain shape. One embodiment of the EDFA section includes a high return loss termination located after the erbium fiber to receive unabsorbed pump power. Multiple hybrid Raman-EDFAs can be connected in an amplifier chain in a transmission system. The transmission system preferably provides a dispersion map including regular composite fiber spans followed by at least one compensating span of negative dispersion fibers. The Raman sections of the hybrid Raman-EDFAs are preferably coupled to negative dispersion fiber in the transmission system.
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Foursa Dmitri
Lin Chinlon
Mills Michael A.
Nissov Morten
Pedersen Bo
Bolda Eric
Grossman Tucker Perreault & Pfleger PLLC
Keith Jack
Tyco Telecommunications (US) Inc.
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