Apparatus and method for detecting channel information from WDM optical signal by using wavelength selective photo detector
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United States of America Patent
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Oct 22, 2002
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N/A
app pub date -
Oct 29, 1999
filing date -
Nov 9, 1998
priority date (Note) -
Expired
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Abstract
An apparatus and a method for detecting channel information from wavelength division multiplexed (WDM) optical signals by using a wavelength selective photo detector. This apparatus and method can monitor channel status in a simple, rapid and economical way. The apparatus includes: pre-processor for pre-processing WDM optical signals and outputting a portion of the WDM optical signals; a photo detector for converting the WDM optical signal from said pre-processor a first electrical signal having a constant value regardless of wavelengths of the WDM optical signal; a wavelength selective photo detector for converting the WDM optical signal from said pre-processor into a second electrical signal having a different value in response to the wavelength of the distributed optical signal; lookup table; normalization part for normalizing the second electrical signal with respect to the first electrical signal; channel number detector for detecting a number of channels using the electrical power for one channel and power of the first electrical signal; and channel location detector for detecting channel location by using normalized electrical signals and electrical power values stored in said lookup table.
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