Distortion penalty measurement procedure in optical systems usin

Details Distortion penalty measurement procedure in optical systems usin Distortion penalty measurement procedure in optical systems usin

1997-09-19

2000-05-30

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359161, 359158, 356 731, H04B 1008, H04B 1000, G01N 2100

Patent

active

060697180

ABSTRACT:
The BER is used as a parameter for evaluating the performance of an optical transmission system. Performance of optical systems is also defined by the Q factor, which uniquely determines the BER in the absence of distortion. The measurements are effected in a point of operation of the channel which gives a value of interest for the Q factor. To this end, the optical SNR is lowered by adding noise over the information signal. A distortion-free Q (Q.sub.DF) and a back-to-back Q (Q.sub.BB) are determined in the same operating point of the system. The distortion penalty for transmitter-receiver pair may be determined by comparing Q.sub.DF to Q.sub.BB. The noise loading technique will allow to investigate if equalizing. The value of OSNRs at the output of a particular system results in equalizing the noise margin in that systems or not.

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