HI Fayiqa,
Thanks for your suggestions. Actually I have seen a paper and it mentions that the bandwidth of wdm multiplexer depends of the modulation format inserted and the bit rate. furthermore, it sets the bandwidth for a bit rate 4*10 gbit/s (4 channels) like
-for RZ modulation B=4*bitrate
-for NRZ modulation B=2*bitrate
-for CSRZ,DRZ and MDRZ B=16GHZ
My question is how does he get this ??
I did the same simulation but I got bad eye diagram in the case of RZ and CSRZ.