Abstract
Feature Issue on Optical Performance Monitoring (OPM). A method for
asynchronous code determination (ACD) is one of the most promising ways of
monitoring signal quality in transparent networks, since it does not require any
clock recovery circuits. In the case of the conventional ACD scheme using the
asynchronously measured probability-density function (PDF) of the inside of an
eye-diagram, the PDF often becomes distant from Gaussian distribution, owing to
cross points of the received signal eye-diagram, which is undesired. In contrast,
when we use the asynchronously measured PDF of the outside of the eye-diagram, the
above-mentioned PDF distortion problem is by nature lessened, and this is useful for
stable monitoring of signal quality. We report the results of the
performance-monitoring scheme, using the asynchronously measured PDF of the outside
of an eye-diagram.
© 2003 Optical Society of America
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