H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/08 (2006.01) H04L 1/20 (2006.01)
Patent
CA 2406898
The distortion component of an optical signal received from an optical transmission system, such as an all-optical system, subject to noise and amplitude distortion components, can be evaluated by a method that utilises information derived from analysing the bit error ratio (BER) of the signal as a function of a movable threshold. The analysis is performed in high and low bit error ratio areas of the eye diagram used for data one/zero decision making. The intersections with the threshold axis (where BER=0.25) of extrapolations of the high and low bit error ratio values provide variables V1 and V2 which are divided (V1/V2) to obtain an estimate/prediction of the amplitude closure of the eye diagram resulting from amplitude distortion. The analysis is preferably carried out after Q conversion of the BER values. The method can also be extended to provide indications of Q, bit error ratio and optical signal-to- noise ratio within the signal.
Anslow Peter J.
Heath Richard W.
Nortel Networks Limited
Smart & Biggar
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