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2003 Course Fiber Optic Instrumentation

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Total No. of Questions : 12] P1519 [Total No. of Pages : 3 [3764] - 294 B.E. (Instru.) FIBER OPTIC INSTRUMENTATION (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer three questions from Section -I and three questions from Section -II. 2) Answers to the two sections should be written in separate books. 3) 4) Neat diagrams must be drawn wherever necessary. Assume suitable data, if necessary. SECTION - I 1) a) b) 2 ) a) b) With the aid of simple ray diagram, describe: i) Multimode step index fiber. ii) Single-mode step index fiber. Compare the advantages and disadvantages of these. [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 Describe the mechanism for the transmission of light within the optical fiber using simple ray theory. 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] Describe with the aid of suitable diagrams, the following concepts in optical fiber transmission: (any two) [8] i) Evanescent field. ii) Goos-Haenchen shift. iii) Mode coupling. P.T.O.

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