HELLO RIFAT NAZNEEN..
Well as far as your query is concerned i dont have much knowledge but i can provide you with the link of the post where it has been discussed how to design a frequency comb.. in the link Damian has said that it is possible with optisystem software… You can use CW Laser Array combined with the Ideal Mux. Set the number of ports for each component to some value N representing the number of lines and set the linewidth to 0 MHz in the laser array to get the Dirac comb…
Thanks & regards