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The PMD effect in OSNR monitoring

Polarization‐mode dispersion (PMD) effect on monitoring optical signal‐to‐noise ratio (OSNR) by polarization‐nulling technique has been investigated. Without PMD, the maximum and minimum optical power is measured using the polarization‐nulling method to provide accurate OSNR. Due to the difference in arrival time for the two component pulses, it is impossible to transfer the pulse to a linear polarization state. The output power after the polarizer will depend on both OSNR and differential group delay (DGD). It is shown that the accuracy of the polarization‐nulling method can be reduced significantly by PMD. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 558–560, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20696