The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2006
Filed:
Mar. 14, 2003
Dmitri Foursa, Freehold, NJ (US);
Morten Nissov, Ocean, NJ (US);
Alexei N. Pilipetskii, Colts Neck, NJ (US);
Michael A. Mills, Freehold, NJ (US);
Chinlon Lin, Holmdel, NJ (US);
BO Pedersen, Annapolis, MD (US);
Dmitri Foursa, Freehold, NJ (US);
Morten Nissov, Ocean, NJ (US);
Alexei N. Pilipetskii, Colts Neck, NJ (US);
Michael A. Mills, Freehold, NJ (US);
Chinlon Lin, Holmdel, NJ (US);
Bo Pedersen, Annapolis, MD (US);
Tyco Telecommunications (US) Inc., Morristown, NJ (US);
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.