Hi,
If you switch the Optical Fiber component from Constant to From File the loss will act on wavelengths differently. I have attached a simple project to demonstrate this.
I’m not sure we have a dat file for that entire range, but for SMF-28 we do have the range from 1.4 um to 1.65 um. I have attached the dat file as well, so that you can look at the structure.
Regards,
Damian