The correct answer is False.
Differential attenuation of modes is the phenomenon where different modes in a multimode optical fiber experience different amounts of attenuation. This is due to the fact that the modes travel different paths through the fiber, and these paths may have different refractive indices. As a result, some modes will experience more attenuation than others.
Intermodal pulse broadening is the phenomenon where the width of a pulse of light increases as it travels through a multimode optical fiber. This is due to the fact that the different modes travel at different speeds, and these speeds may vary depending on the refractive index of the fiber. As a result, the different modes will arrive at the output of the fiber at different times, which will broaden the pulse.
The differential attenuation of modes does not reduce intermodal pulse broadening. In fact, it can actually make the problem worse. This is because the modes that experience more attenuation will arrive at the output of the fiber later than the modes that experience less attenuation. This will further broaden the pulse.
There are a number of ways to reduce intermodal pulse broadening. One way is to use a single-mode optical fiber. Single-mode fibers have only one mode, so there is no intermodal pulse broadening. Another way to reduce intermodal pulse broadening is to use a shorter optical fiber. This is because the different modes will travel for a shorter distance, and the difference in their arrival times will be smaller.