Hi Damian,
Thanks for your reply.
Okay let take a simple example ” I used CW multi-mode laser with LG 00 mode and send it directly over the 100 km of multimode parabolic indexed fiber. Now i compared the spatial profile after the multi-mode fiber and after the CW spatial laser by using spatial visualizer in OptiSystem. Now it shows the same spatial profile as after the laser as well as after multimode fiber. There is no effect in the spatial profile as it suppose to be attenuated when transmitted over such long distance. Can you justify this ??
Thanks in advance.
Regards
Sushank