I have found the correct way to implement this system.Use AWG for the routing od the each particular wavelength to particular port.AWG just provide you different wavelengths at different output ports attache to the input port collectively.
Basically AWG is a component or devise used to combine or saprate the signals with different wavelengths.For better understanding you can go through the link i have mentioned below
http://www.rp-photonics.com/arrayed_waveguide_gratings.html