Patent ID: 7082266
Filing Date: 2006-07-25
Classification: G01J,G02B,H04B,H04J

Abstract:
1. An optical channel monitoring apparatus, comprising: an input unit comprising a lensed fiber receiving a wavelength division multiplexed (WDM) optical signal comprising a plurality of channels occupying a same space via an optical transmission medium and producing a collimated beam of optical signals, said input unit further comprising a concave lens receiving said collimated beam and outputting a plurality of optical signals that have a continuous range of incidence angles; and a filter for receiving said plurality of optical signals from the input unit and separating the WDM optical signal into a plurality of optical signals having different wavelengths using the difference between resonance lengths according to the incident angles, wherein each of said plurality of optical signals representing a different one of said plurality of channels becomes spatially separated from each other by said filter.