[20 pts] 2 . Consider the step-index fiber of Fig. (B) with a core diameter of 62.5 m. The applicable mode chart is given in Fig. (C). Estimate the number of modes at 1300 nm n2=1.47 12e 62.5 n1=1.49 Figure (B) DRAWING NOT TO SCALE 90 Axial HE Deff TE01 HE2HE TE 2.405 e% 5 6 HE22 2 3 4 6 Figure (C)