DWDM Noise introduced for multiple channels
I want to analyze the OSNR for a DWDM link, with 50km of fiber length, 3 EDFAs,and one DCF.
With a WDM analyzer at the output of the MUX, I see that for 8 or less used channels, the noise per channel at the output of the MUX is -100dBm.
For 16 channels, noise is around -50 and for 40 channels used, around -30.
Can someone explain me why Noise value changes at multiple channels used ?
I am using a WDM transmitter, output power 2.6dBm, 100Ghz spacing, 10Gb/s, 30Ghz BW for the WDM MUX ES.
Thank you !
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