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1997 Course Fiber Optic Communication (Elective II)

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Total No. of Questions : 10] [Total No. of Pages : 3 [3764]-1035 P1574 B.E. (EC) FIBRE OPTIC 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) 5) Figures to the right indicate full marks. Assume suitable data, if necessary. SECTION - I Q1) a) What are Fiber modes? Explain mode theory for optical fiber in detail. [8] b) Compare SM fiber and Graded index fiber. Explain the requirements for fiber materials. [8] Q2) a) A fiber has normalized frequency is 26.6 and wavelength is 1300nm. If the radius of core is 25 m. Compute numerical aperture? [6] b) Determine the cutoff wavelength for a step index fiber to exhibit single mode operation when the core refractive index and radius are 1.47 and 4.6 m, respectively, with the relative refractive index difference being [6] 0.30%. c) Multimode step index fiber with core diameter of 80 m and index difference of 1.5% at wavelength of 0.85 m. If the refractive is 1.48, find normalized frequency and no. of modes. [6] Q3) a) What is meant by material dispersion? Derive the expression for the pulse broadening due to material dispersion. [8] b) Discuss various kinds of losses that an optical signal might suffer while propagating through fiber. Which is most important one? What is the effect of these losses on light power and pulse shape? [8] P.T.O.

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