Home Forums SYSTEM DWDM Noise introduced for multiple channels

DWDM Noise introduced for multiple channels

Profile Photo
(joined October 2020)
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 !

Responses (1):

    • #69583
      Profile Photo
      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 !

    • #69587
      Profile Photo
      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

Login You must be logged in to reply to this topic.