06219162 is referenced by 38 patents and cites 9 patents.

A method of equalizing the channels of a WDM link comprises identifying an error threshold level BER

Fail

for the BER defined for each signal S(j) in accordance with the channel rate, and determining the attenuation A(j) of, for example, the power P(j) of each signal S(j) transmitted over the WDM link. The transmitter powers are adjusted taking into account the attenuations determined for all channels. The attenuation A(j) for channel (j) is determined by first setting the power P(j) of all signals S(j) to a maximum P

Max

, attenuating the power P(j) of channel (j) until the BER reaches the threshold value BER

Fail

, measuring the power corresponding to the BER

Fail

for that channel, and calculating the difference between the P

Max

and P(j)

Fail

. The transmitter powers are then set according to the relationship P(j)=P

Max

−&eegr;(A(j)−A

Min

), where &eegr; is 0.8 for a system with 3-4 channels. The method may be used for multi-channel systems with intermediate nodes where channels are added and dropped.

Title
Methods for equalizing WDM systems
Application Number
9/559562
Publication Number
6219162 (B1)
Application Date
April 27, 2000
Publication Date
April 17, 2001
Inventor
Chung Yu Wu
Kanata
US
Chris Wilhelm Barnard
Orleans
US
Agent
Aprilia U Diaconescu
US
Assignee
Nortel Networks
US
IPC
H04J 14/02
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