1. Consider a fiber with a 25-μm core radius, a core index n1=1.48, and Δ=0.01.
(a) If λ=1300 nm, what is the value of V and how many modes propagate in the fiber?
(b) If the core-cladding difference is reduced to Δ=0.006, how many modes does the fiber support and what fraction of the optical poser flows in the cladding?