ESE 2021 Technical Quiz 138|| Fibre-optic communication systems, block schematics, link calculations, system design

For a multimode silica fibre that has a core refractive index n₁ = 1.48 and cladding index n₂ = 1.45, what is the acceptance angle for the fiber?

For a single-mode optical cable with 0.3 dB/km loss, the optical power at 100km from a 0.1mW of light source is

A fiber optic cable with and, will have acceptance angle in degrees as

For a single-mode optical cable with 0.3 dB/km loss, the optical power at 100km from a 1mW of light source is

If the total optical power is 2 mW, and possible modes in the fiber is 25 then what is the average optical power residing in the cladding?