Abstract
Feature
Issue on Optical Performance Monitoring (OPM). We propose and
demonstrate a simple method for monitoring optical signal-to-noise ratio (OSNR) of
each channel in wavelength-division multiplexing networks based on tracking of
principal states of polarization (PSP) and scrambling at the transmitter part. This
technique reduces measurement error caused by the effect of PMD, which limits the
performance of a previous polarization extinction method. PSP tracking uses
bandpass-filtered power at clock frequency for a non-return-to-zero signal as a
feedback signal to separate the two PSPs by aligning them to the axes of a
polarization beam splitter (PBS). The scrambling makes it possible to extinguish the
polarization of an optical signal from one output of the PBS and to provide maximum
and minimum optical powers, thus enabling us to obtain OSNR regardless of the effect
of PMD. In a transmission experiment over a 400-km single-mode
fiber-dispersion-compensating fiber (SMF+DCF) link, the results showed that the
difference between the OSNRs measured by use of the proposed method and by an
optical spectrum analyzer (OSA) was less than 1.0 dB.
© 2003 Optical Society of America
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