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2003 Course Fiber Optic Instrumentation

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Total No. of Questions :6] P1334 [Total No. of Pages : 2 [3864]-294 B.E. (Instrumentation & Control) FIBER OPTIC INSTRUMENTATION (2003 Course) ( 406264 (3) ) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section Iand 3 questions from Section II 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) b) Compare the advantages and disadvantages of Multimode step index fiber and Single-mode step index fiber. [8] A silica optical fiber with a core diameter enough to be considered by ray theory analysis has a core refractive index of 1.49 and a cladding refractive index 1.40. Determine the critical angle at the core-cladding interface, numerical aperture for the fiber and the acceptance angle in air for the fiber. [9] OR a) Briefly discuss with the aid of a suitable diagram what is meant by the acceptance angle for an optical fiber.Show how this is related to the fiber numerical aperture and the refractive indices for the fiber core and cladding. [9] b) Describe with the aid of suitable diagrams, the concepts of Evanescent [8] field in optical fiber transmission. Q2) a) Explain what is meant by the critical bending radius for an optical fiber.[9] b) Describe various attenuation mechanisms in optical fiber transmission in [8] detail. OR a) b) Explain the reasons for pulse broadening in optical fiber. Describe the role of OTDR in distributed optical fiber sensing. [8] [9] P.T.O.

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