G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 17/14 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2377623
Various methods and apparatuses are provided for performing a radix-M FFT (Fast Fourier Transform) upon N time domain samples to produce N/S frequency domain samples for detecting tones of dithers impressed on channels of a WDM (wavelength Division Multiplexed) optical signal. Successive tones have a tone frequency spacing, .DELTA.f ta, and a sampling frequency, f S, is chosen so that f s = N.DELTA.f ta/S. S is a spacing given by S = M w with w being an integer. The radix-M FFT is performed in k = log M(N) stages and within the stages a reduced number of radix-M computations, when compared to the number of radix-M computations of a conventional radix-M FFT, are performed on data points associated with the N time domain samples. This is possible because successive frequency domain samples of the N/S frequency domain samples differ by .DELTA.f ta = S.DELTA.f where .DELTA.f is a frequency bandwidth.
Jin Dongxing
Marziliano Leonard
Remedios Derrick
Wan Ping Wai
Alcatel-Lucent Canada Inc.
Donnelly Victoria
Tropic Networks Inc.
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