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Damian Marek

Hi Abdallah,

The problem here could be that the spatial CW laser is not exciting the higher order modes because it not have the right generated modes. Try playing with these settings to excite the fiber modes.

From my understanding the LP11a and LP11b modes are just different polarizations of the same mode. If you inject light that is both x and y polarized you should detect these different modes at the output.