Line width 0.2 MHz,Gain of amplifier 20 db,launched power 0 dbm. At ONU, a 3dB optical splitter divides downstream into two parts. An
intensity modulation technique of 10-Gbps OOK is used to re-modulate the first half of the power splitter to generate upstream data signal while the second half goes to DQPSK OR DPSK receiver.This re-modulation takes place by the received downstream signal which is either DPSK or DQPSK. I know its hard to understand but currently i am working on this project and it is not possible for me at this time to upload simulation.
just see my eye diagram and tell why one eye coincide with another eye as i have clear eye opening on up streaming side.