Dear Muhammad,
This visualizer automatically detects, calculates and displays the optical power, noise, OSNR, Gain, noise figure, frequency and wavelength for each WDM channel at the visualizer inputs.
The Dual Port WDM Analyzer (DPWDMA) estimates the signal and the noise power for each optical signal channel based on the resolution bandwidth for each input port. Click the Analysis tab to view the results (such as gain and noise figure) comparing the signal from the two input ports (see Figure 2).
More details could be found in the component data sheet.
regards,