Hello Krishna,
Please note that you can’t load OptiSystem .osd files to the posts on the forum. You may email your zipped project file to support@optiwave.com and we’ll check it out.
You may use the WDM analyzer to measure the available channels at the input of the receiver (place it at the output port of the component in front of the receiver) and get the power of interfering channels and calculate the crosstalk.
Regards,
Ahmad