Pilot tones for optical signal wavelength identification and...

Details Pilot tones for optical signal wavelength identification and... Pilot tones for optical signal wavelength identification and...

2003-04-30

2008-08-12

Tran, Dzung D (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S030000, C398S033000

Reexamination Certificate

active

07412166

ABSTRACT:
A method of optical communication includes providing a plurality of optical signals each associated with a distinct channel of a composite optical signal. A unique pilot tone signature is superimposed on each channel. The spectral composition of each signature includes a plurality of frequencies. In one embodiment, binary frequency shift keying at a frequency fmis used to shift between instantaneous frequencies f1and f2wherein f2+Δf=f1−Δf=fc. ChoosingΔ⁢⁢ffm≈1.1602produces a spectrum having a plurality of dominant components at least some of which have substantially the same amplitude. A method of detecting the presence of a selected pilot tone signature having a plurality n of dominant spectral components F1. . . Fnincludes generating a power spectrum P0(f). Sk(f) is calculated as a product of a plurality of frequency shifted versions of P0(f), where k∈{1 . . . n}. The existence of a dominant spectral component at Fkindicates the presence of the selected pilot tone signature.

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