System and method for a supervisory signal modulation scheme...

Details System and method for a supervisory signal modulation scheme... System and method for a supervisory signal modulation scheme...

2004-10-21

2008-08-05

Li, Shi K. (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

Reexamination Certificate

active

07409156

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.

REFERENCES:
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patent: 2003/0198469 (2003-10-01), Bisson et al.
patent: 2005/0078351 (2005-04-01), Avallone et al.
patent: 1 322 052 (2003-06-01), None
patent: 8-321824 (1996-12-01), None
patent: 2003-204306 (2003-07-01), None
patent: WO 02/089366 (2002-11-01), None

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