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1997 Course Optical Fiber Communication (Elective II)

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Total No. of Questions : 10] [Total No. of Pages : 3 [3764]-1051 P1840 B.E. (EC) OPTICAL FIBRE COMMUNICATION (404210) (1997 Course) (Elective - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer any 3 questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) What is the basic principle behind optical transmission? Sketch the structure, index profile and path taken by light ray in SI and GI fibers.[6] b) The refractive index of a core is n1 = 1.48, nclad = 1.46. Under what conditions will light be trapped inside the core? [2] c) Define Numerical aperture and give the expression for the same in both SI and GI fibers. For the plastic fibre, n1 = 1.495, n2 = 1.402. Calculate the acceptance angle and Numerical Aperture. [8] Q2) a) What is meant by group velocity dispersion? What are the causes for intramodal dispersion? Explain how intermodal dispersion is reduced in GI fiber as compared to SI fiber. [8] b) What is meant by leaky modes? How do scattering losses arise? Distinguish Linear and Non-Linear scattering. [8] P.T.O.

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