Dear Sify, a WDM interleaver is used to separate the different wavelength components in a signal. It is basically used in case where wavelength division multiplexing (WDM) is done, Suppose we are designing a WDM system which contain 1510 nm and 1550 nm signal which are multiplexed and transmitted through the same fiber. the 1*2 WDM interleaver can be used to separate the two wavelengths. Here we have to set the Center frequency of the first filter and then Frequency spacing between adjacent filters (let 100 GHz) then 3-dB filter bandwidth and other parameters in the component properties accordingly as required, It is most useful in DWDM systems where the frequency spacing is less such as 50GhHz.
Thanks