Hi shanmuga srinivasan,
Here i will osd file of 8 Channel dwdm system with CSRZ modulation formats, DRZ modulation formats, MDRZ modulation formats, for 10 gbps or more in downlink. you can use this ods file for your future works because these modulation formats are very efficient and transmit upto 1000 km and used in long haul comminucation.
here you can increase no. of channel(user) and by using bidirectional fiber and bidirectional AWG you can use for bidirectinal designs.