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problem 1: describe the method of intermodal dispersion in multimode step index fiber.

problem 2: describe the phenomenon of modal noise in optical fibers and propose how it might be avoided.

problem 3: Describe what is meant by:

a) Modal Birefringence
b) The beat length.

problem 4: Describe what is meant by the critical bending radius for an optical fiber.

problem 5: What do you mean by Dispersion phenomenon? Describe in brief the different types of dispersion occurring in the optical fibers.

problem 6: What is dispersion shifted and dispersion flattened fibers.

problem 7: Two step index fibers exhibit the given parameters:

a) A multimode fiber with core refractive index of 1.5, a relative refractive index difference of 3% and an operating wavelength of 0.82um.

b) An 8um core diameter single mode fiber with a core refractive index similar as (a), a relative refractive index difference of 0.3% and an operating wavelength of 1.55um. Find out the critical bending radius of curvature at which large bending losses take place in both cases.

problem 8:  A multimode graded index fiber exhibits total pulse broadening of 0.1us over a distance of 15 Km. Estimate:

a) Maximum possible bandwidth on the link supposing no inter symbol interference;
b) The pulse dispersion per unit length.
c) Bandwidth-length product for the fiber.

problem 9: Two polarization maintaining fibers operating at a wavelength of 1.3um encompass beat lengths of 0.7mm and 80m. Find out the modal birefringence in each case and comment on the outcomes.

problem 10: The difference between the propagation constants for the two orthogonal modes in a single mode fiber is 250. It is illuminated with light of peak wavelength 1.55um from an injection laser source with a spectral line width of 0.8nm. Find the coherence length in the fiber.

Electrical & Electronics, Engineering

• Category:- Electrical & Electronics
• Reference No.:- M97403

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