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2003 Course Fiber Optic Instrumentation

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Total No. of Questions : 12] P1009 [Total No. of Pages : 3 [3664]-255 B.E. (Instrumentation) 406264(3) : FIBER OPTIC INSTRUMENTATION (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section-I and 3 questions from Section-II. 2) Answers to the two sections should be written in separate books. 3) Figures to the right indicate full marks. 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) Explain what is meant by a graded index optical fiber, giving an expression for the possible refractive index profile? Using simple ray theory concepts, discuss the transmission of light through the fiber. Indicate the major advantage of this type of fiber with regard to multimode propagation. [10] b) Briefly indicate with the aid of suitable diagrams the difference between meridional and skew ray paths in step index fibers. [6] OR Q2) a) An optical fiber has a numerical aperture of 0.20 and a cladding refractive index of 1.59. Determine: [8] i) The acceptance angle for the fiber in water which has a refractive index of 1.33; ii) The critical angle at the core-cladding interface. b) Describe with the aid of simple ray diagram: i) Multimode step index fiber ii) Single-mode step index fiber Compare the advantages and disadvantages of these two types of fiber for use as an optical channel. [8] P.T.O.

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