Hello Shaid
1.) You have selected the center frew. it is ok,But as far as i know you have to insert the optical filter to stand out the different wavelengths.By only selecting center frew. does not eliminate the requirement of optical filters and AWG.for example optiwave sample of wdm pon they have used AWG due to reason of routing the wavelenghts to diffrent pon.
For EML you need to use PRBS Generator+Mach Zehnder Modulator with CW Transmitter.For circulators and couplers 3dB and mux demux 3-5dB.