Question

Problem 90. A) Does an optical fiber need a cladding for total internal reflection to occur? Justify your answer. B) Why do optical fibers have claddings? Problem 91. A) Estimate the width (duration of narrowest pulses that could be made with a laser source that outputs light over a frequency range from 5.0001 x 1014 Hz to 5.0002 x 1014 Hz. B) Consider an optical fiber of length 300 m. If a power of 4 mW is coupled into the fiber and a power of 0.2 mW exits the fiber, find the attenuation coefficient of the fiber.

Answer 1

(A) yes, (B) cladding lower the refractive index at core interface of optical fibre so that total internal reflection occurs within core and light can transmit by phenomena of total internal reflection.