Patent ID: 6469814
Filing Date: 2002-10-22
Classification: H04B,H04J

Abstract:
An apparatus for detecting channel information in each channel from wavelength division multiplexed (WDM) optical signals each having a different wavelength, comprising:a pre-processor for pre-processing WDM optical signals and outputting a portion of the WDM optical signals; a first converter for converting pre-processed WDM optical signal into a first electrical signal having a constant value regardless of wavelengths of the WDM optical signal; a second converter for converting the pre-processed WDM optical signal into a second electrical signal having a different value in response to the wavelength of the distributed optical signal; a lookup table storing wavelengths to be used, a number of channels and an electrical signal power for one channel; means for normalizing the second electrical signal with respect to the first electrical signal; a channel number detector for detecting a number of channels using the electrical signal power for one channel and power of the first electrical signal; and a channel location detector for detecting channel location by using normalized electrical signal from said second conversion means and electrical power values stored in said lookup table.