A silica fiber has an outer diameter of 125 micro meter. What is the total volume of silica for a 1-km length? This fiber is wound on a spool whose unloaded diameter is 20 em. The spool height is 10 em. Compute the diameter of the fully loaded spool.
Consider an SI fiber with n1 = 1.5 and n2 = 1.485 at 0.82 micro meter. If the core radius is 50 micro meter, how many modes can propagate? Repeat if the wavelength is changed to 1.2 micro meter.
An SI fiber is single mode at 1.4 JLm but not at shorter wavelengths; n1 = 1.465 and n2 = 1.46. Compute the core radius. Find the number of modes at 0.8, 0.85, and 0.9 micro meter. (Hint: Use the mode chart.)
multimode fiber has an equilibrium length of 0.5 km. In the linear region, its pulse spread per unit length is 30 ns/km. The spread is due primarily to modal distortion. Plot the 3-dB electrical and 3-dB optical bandwidths versus fiber length for 0 to 5 km. Also plot the maximum RZ and NRZ data rates.
Find the total number of propagating modes in an SI fiber having a normalized frequency of 4.5 when the wavelength is 800 nm.
A fiber has an NA = 0.2588. A light source coupled to it emits 75% of its light into a 60° full-cone angle, 50% into a 30° cone, and 25% into a 15° cone. What is the coupling efficiency when this source and fiber are connected?