Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Reexamination Certificate
2006-07-20
2008-05-06
Keith, Jack (Department: 3663)
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
C359S337100
Reexamination Certificate
active
07369300
ABSTRACT:
The present invention provides an optical amplifier pre-emphasis and equalization method that alleviates the optical amplifier gain ripple penalty experienced in conventional optical communications systems. This method includes storing measured communications channel signal gain ripple information, acquired during factory calibration, in the internal memory of each optical amplifier module. When the optical amplifiers are assembled into a chain, system software retrieves this communications channel signal gain ripple information from each optical amplifier module and computes the pre-emphasis or equalization required for each channel in order to obtain a flat SNR at a receiver. The method also includes measuring the ambient temperature of each optical amplifier module and applying a correction based on the expected change in gain response of each optical amplifier. The method further includes, for Raman amplifiers and the like, applying a fiber type, gain setting, GFF error, etc. correction based on the expected change in gain response of each optical amplifier. The method relies on using VOAs at the sources or DGEs/RBFs in the optical signal path to pre-emphasize or equalize the optical channels.
REFERENCES:
patent: 5225922 (1993-07-01), Chraplyvy et al.
patent: 6359726 (2002-03-01), Onaka et al.
patent: 6731424 (2004-05-01), Wu
patent: 6738183 (2004-05-01), Shigeharra
patent: 6839160 (2005-01-01), Tsuda et al.
patent: 6956687 (2005-10-01), Moon et al.
patent: 7006278 (2006-02-01), Sakamoto et al.
patent: 2002/0154359 (2002-10-01), Tsuda et al.
patent: 2003/0184843 (2003-10-01), Moon et al.
patent: 2005/0100271 (2005-05-01), Frankel
Frankel Michael Y.
Sridhar Balakrishnan
Bernard Christopher L.
Bolda Eric
Brown Tyler S.
Ciena Corporation
Clements Bernard Miller
LandOfFree
Optical amplifier pre-emphasis and equalization method and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical amplifier pre-emphasis and equalization method and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical amplifier pre-emphasis and equalization method and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3982902