| 摘要 |
Disclosed herein is an Optical Signal to a Noise Ratio (OSNR) monitoring system for a Wavelength Division Multiplexing (WDM) optical transmission system. The apparatus includes a Polarization Mode Dispersion (PMD) compensating means, a wavelength variable bandpass optical filter, a first polarization controller, a second polarization controller, an optical signal separating means, a linear polarizer and an OSNR measuring means. The PMD compensating means compensates for PMD of the wavelength division multiplexed optical signal. The wavelength variable bandpass optical filter filters out an optical signal having a center wavelength lambda, whose OSNR will be measured, from the wavelength division multiplexed optical signal, other channels' OSNR will be measured by varying a center wavelength lambda thereof. The first polarization controller controls a polarization state of the filtered optical signal. The optical signal separating means separates the polarization-controlled optical signal into first and second optical signals. The linear polarizer linearly polarizes the second optical signal.
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