Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2006-10-05
2008-12-09
Bolda, Eric (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S344000
Reexamination Certificate
active
07463412
ABSTRACT:
A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multiplexed before coupling into the fiber. The Raman amplified optical signal may be demultiplexed and separately amplified by the SOAs before re-multiplexing. Gain profiles of the Raman pumps and the SOAs are selected to compensate for gain tilt and to alleviate the power penalty due to cross-gain modulation in the SOAs. The disclosed hybrid amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems.
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Iannone Patrick P.
Reichmann Kenneth C.
Zhou Xiang
AT&T Corp.
Bolda Eric
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