Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2011-06-28
2011-06-28
Bolda, Eric (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S337110, C359S341400
Reexamination Certificate
active
07969647
ABSTRACT:
A change in loading conditions of fiber amplifiers in an optical communications network causes rapid variations in the gain profile of the amplifiers due to spectral hole burning and stimulated Raman scattering. An apparatus for reducing such gain profile variations is described which monitors optical signal perturbations and reacts by adjusting pump powers of the amplifiers and, or fast variable optical attenuator according to a pre-determined function stored in the form of constants in controller's memory. The optical signal is monitored as total power, and the power of light after passing through one or more optical filters. The light detection is relatively fast, whereby the gain profile variations are compensated by fast controlled variable optical attenuator and pump power adjustment upon the change in loading conditions.
REFERENCES:
patent: 5838487 (1998-11-01), Nilsson et al.
patent: 6088152 (2000-07-01), Berger et al.
patent: 6275313 (2001-08-01), Denkin et al.
patent: 6341034 (2002-01-01), Sun et al.
patent: 6377730 (2002-04-01), Bergmann et al.
patent: 6441950 (2002-08-01), Chen et al.
patent: 6510000 (2003-01-01), Onaka et al.
patent: 6721091 (2004-04-01), Foursa et al.
patent: 6775056 (2004-08-01), Grubb et al.
patent: 7236294 (2007-06-01), Takeyama et al.
patent: 7359112 (2008-04-01), Nishihara et al.
patent: 2002/0044343 (2002-04-01), Manzur
patent: 2006/0187538 (2006-08-01), Zhou et al.
patent: 2006/0187539 (2006-08-01), Zhou et al.
patent: 2006/0203329 (2006-09-01), Nishihara et al.
Xiang Zhou et al, “Fast control of inter-channel SRS and residual EDFA transients using a multiple-wavelength forward-pumped discrete Raman amplifier,” OMN4, OFC 2007.
Maxim Bolshtyansky et al, “Dynamic Compensation of Raman Tilt in a Fiber Link by EDFA during Transient Events,” JThA15, OFC 2007.
Bolshtyansky Maxim
Cowle Gregory
Bolda Eric
JDS Uniphase Corporation
Pequignot Matthew A.
Pequignot & Myers LLC
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