Apparatus and method to accurately monitor signal quality in optical signal transmission systems
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United States of America Patent
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Issued Date -
Aug 19, 2004
app pub date -
Feb 19, 2003
filing date -
Feb 19, 2003
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Abandoned
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Abstract
The design and apparatus constitutes the present invention allows for accurate analysis of optical signal quality such as wavelength, signal power and optical signal to noise ratio (OSNR) in ITU wavelength based dense wavelength division multiplexing fiber optical transmission system by using a optical tunable filter, a wavelength self-referencing system and a multi-channel optical power attenuation filter and detecting simultaneously or successively signal and noise separately in routing signal into one detection arm and noise into a signal attenuated detection arm. The tunable filter can be either a transmissive or a reflective device, which can be tuned across the wavelength band by way of control signal. The present invention advantageously supply a technique to measure accurately the optical signal power and optical noise level.
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