Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-03-28
1998-04-28
Ngash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359130, 385 24, 385 37, H04J 1402
Patent
active
057452709
ABSTRACT:
A system and associated method for determining if a channel signal carried by a discrete wavelength channel is properly centered for that wavelength channel. A signal generator is provided that superimposes a secondary signal over the original signal in a signal channel. Tone detectors are provided at a point after the superimposition of the secondary signal. The tone detectors detect the superimposed tone signal at wavelengths that are longer and/or shorter than the wavelength assigned to the wavelength channel. By measuring the degree of balance between wavelengths longer than the wavelength assigned to the wavelength channel and the wavelengths shorter than the wavelength assigned to the wavelength channel, it can be determined if the original signal is centered for that wavelength channel. If a predetermined degree of balance is not obtained, the original signal for the wavelength channel can be corrected or can be recognized as being non-compliant.
REFERENCES:
patent: 5233462 (1993-08-01), Wong
patent: 5390185 (1995-02-01), Hooijmans et al.
patent: 5589970 (1996-12-01), Lyu et al.
Lucent Technologies - Inc.
Ngash Kinfe-Michael
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