Figure 5. Input pulse at the transmitter end (dash-dotted line) and output distorted pulse at the receiver end (solid line) under the “regular”fiber length L=300m

From

Design of Refractive Index Profile for Multimode Optical Fibers with Low Differential Mode Delay

Anton V. Bourdine

Journal of Optoelectronics Engineering. 2013, 1(1), 5-13 doi:10.12691/joe-1-1-2