System and method for a supervisory signal modulation scheme using variable optical attenuators
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United States of America Patent
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Aug 5, 2008
Grant Date -
Apr 28, 2005
app pub date -
Oct 21, 2004
filing date -
Oct 22, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
System and method for supervisory signal modulation on Wavelength Division Multiplex (WDM) channels wherein variable optical attenuators (VOAs) are used for amplitude modulation of the supervisory signal. Alternatively, at least two spectral bands of the supervisory signal are amplitude modulated by means of VOAs at a same frequency but in phase difference, preferably in anti-phase such that the signal resulting from the combination of the two spectral bands is maintained at a predetermined value, preferably at a minimum value and more preferably at zero value.
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