Hi Sam Sung,
I have done the simulation with 16 and 32 WDM channels. Changing LO phase was the first thing I tried for the single user OFDM, but in order to find the exact angle sometimes you need to repeat the simulation process for a couple of times. Besides it’s not sensible to do such a thing for every channel of a WDM system. I will consider Optical Phase Conjugation. Meanwhile, I will be grateful to hear about other compensation methods.
Thanks for your reply.