# Fiber optics notes | Information Systems homework help

## Q. 1. What are the different types of fibers depending on refractive index profile?

OR

What are the differences between step index and graded index fibers?

OR

## Q. 6. Explain various types of losses in optical fiber cable.

OR

With the help of suitable diagrams, explain in detail basic attenuation mechanisms.

OR

## Describe linear scattering losses in optical fibers with regard to (i) Rayleigh scattering (ii) Mie scattering.

Problem 1. Calculate Transmission loss factor and Rayleigh scattering coefficient for a fiber having following parameters.

## Problem 2. A graded index fiber has a core with a parabolic refractive index profile which

has a diameter of . The fiber has a numerical aperture of 0.2. Estimate the number of guided modes propagating in the fiber when it is operating at a wavelength

## of .

roblem 3. Calculate the refractive indices of the core and the cladding materials of an optical fiber whose NA = 0.35 and A = 0.01.

## Problem 4. Determine the cut off wavelength for a step index fiber to exhibit single mode operation when the core refractive index and radius are 1.46 and 4.5 respectively with the relative index difference being 0.25%.

Problem 5. Calculate the cut off number and number of modes supported by the step index fiber with n1 = 1.53, n2 = 1.5 and with a core radius of 50gm operating at 1550 nm.

## Problem 7. Calculate the diameter of the fiber core of relative refractive index difference is 10%, core refractive index n1 = 1.5, No. of modes propagation is 1100 and wavelength of operation is 1.3 Ans.

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