DWDM Noise introduced for multiple channels - Optiwave

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- June 16, 2021 at 11:50 am #79685
  
  Stan Liviu
  Participant
  
  Hello everyone,
  
  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 !
- June 17, 2021 at 11:15 am #80089
  
  Ahmad Atieh
  Moderator
  
  Dear Stan,
  the cause is due to the addition of the tails of the modulated signal of each DWDM channel within a specific channel MUX bandwidth. The more the number of channels, the more tails (noise) are added.
  Regards,
  Ahmad
- June 17, 2021 at 11:15 am #82693
  
  Ahmad Atieh
  Moderator
  
  Dear Stan,
  the cause is due to the addition of the tails of the modulated signal of each DWDM channel within a specific channel MUX bandwidth. The more the number of channels, the more tails (noise) are added.
  Regards,
  Ahmad
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