We report on the performance of the OSNR monitor based on the polarization-nulling technique. The results show that this monitor is robust to the PMD and in-band crosstalk. For demonstration, we monitored OSNR of the optical signal transmitted through a 120-km long aerial fiber link for one week, and confirmed that OSNR could be measured with accuracy better than ±0.3 dB.

© 2004 Optical Society of America

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