Pam 4 signal

[Waqi Ahmed Najam]

Hello Everyone,
I need a help to generate same pam4 signal at the output side after being amplified using soa. I attached a picture as well for the convenience. In the system i used two soa, i can see pam4 signal at the input side (3,1,-3,-1) is their four level, but i can see four levels at the output side. like at the output side it is showing some signal at the 0 level as well, so it is showing 5 level at the output side,. If anyone can help me on this one, then i will be thankful to him/her.
Thanks

[Ahmad Atieh]

Hello Waqi,
I am wondering why are you using the pump and x-coupler after the EDFA? What wavelength is used for the pump.
I recommend to remove them and check the wave form?

If it doesn’t work, please send me the project layout as zip file at ahmad.atieh@optiwave.com and I’ll take a look at it.
Regards,
Ahmad

[Author]

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