US 7,321,728 B2 | ||
Optical waveform for use in a DWDM optical network and systems for generating and processing same | ||
James Harley, Nepean (Canada); and Lacra Pavel, Nepean (Canada) | ||
Assigned to Nortel Networks Limited, St. Laurent, Quebec (Canada) | ||
Filed on Nov. 18, 2005, as Appl. No. 11/281,437. | ||
Application 11/281437 is a division of application No. 09/539706, filed on Mar. 31, 2000, granted, now 7,197,243. | ||
Prior Publication US 2006/0078337 A1, Apr. 13, 2006 | ||
Int. Cl. H04B 10/08 (2006.01) |
U.S. Cl. 398—32 [398/33; 398/193] | 12 Claims |
1. A method of determining the average intensity of at least one optical data signal, each optical data signal occupying a
respective wavelength of interest in a received optical signal and having an intensity that is amplitude modulated by a respective
overhead signal having an instantaneous frequency content that varies with time, the method comprising:
(1) transforming the received optical signal into an aggregate signal in electrical form;
(2) transforming the aggregate signal into a frequency domain vector;
(3) for each wavelength of interest:
(a) correlating the frequency-domain vector with a plurality of harmonically related frequency-domain templates to produce
plural correlation results, said templates being uniquely associated with the wavelength of interest;
(b) processing the plural correlation results to produce a candidate frequency and a candidate RMS value; and
(c) validating the candidate frequency and the candidate RMS value.
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