Hi Asif,
In the RoF design file you have attached the spectrum of the two optical signals after the interleaver is same, and as far asa the theoretical aspect the interleaver is used two separate the two frequencies in case of a dual wavelength optical signal, and this will help in designing a full duplex system. But in your case you are using for the same type of detection only. Can you please elaborate more in this regards. thanking you.
Regards,
Dhiman