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A Novel Optical Vector Spectral Analysis Technique Employing a Limited-Bandwidth Detector


A new technique for obtaining frequency-dependent magnitude and phase information across an optical channel is presented using tunable allpass optical filters and a detector with a small bandwidth relative to the full channel width. This technique has application to optical monitoring of intersymbol interference distortions, including chromatic and polarization-mode dispersion effects, and thus can provide vector information for input to the control of adaptive optical filters. A method for generating a test signal spanning the spectrum of a modulated data signal without introducing intersymbol interference is discussed. This technique can also be used to characterize an optical pulse source and does not scale in complexity or cost as the bandwidth of the source increases.

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Correspondence to C. K. Madsen.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Madsen, C.K. A Novel Optical Vector Spectral Analysis Technique Employing a Limited-Bandwidth Detector. EURASIP J. Adv. Signal Process. 2005, 857121 (2005).

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Keywords and phrases

  • intersymbol interference
  • chromatic and polarization-mode dispersion
  • optical channel monitoring
  • optical channel estimation