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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. Q3) a) b) What are the three types of fiber misalignments, which may contribute to insertion loss at an optical fiber joint? [8] Discuss the principles of operation of the injection laser. [8] OR a) Compare p-n photodiode with the p-i-n photodiode. b) What are the advantages and drawbacks of the LED in comparison with the injection laser for use as a source in optical fiber sensing? [8] [8] SECTION - II Q4) a) b) a) b) Q5) a) b) a) b) Q6) a) b) a) b) Discuss Encoding-based Position Sensors . [8] What are the characteristics, advantages and drawbacks of Optical Fiber Sensors? [8] OR Describe one technique of sensing which is based on intensity modulation. Also enlist various parameters, which can be sensed by using this technique. [8] What do you understand by intrinsic and extrinsic Optical Fiber Sensors? With the aid of suitable diagrams describe one intrinsic Optical Fiber Sensor. How do you calibrate this sensor? [8] Discuss Fiber Grating Manufacturing . [9] Explain one optical fiber sensor in which Fiber Bragg Grating is used.[9] OR What are the advantages and limitations of Distributed Optical Fiber Sensing? Explain Distributed Optical Fiber temperature Sensing. [10] Explain different performance parameters, which characterize any Distributed Optical Fiber Sensing. [8] Give major reasons which have led to the development of optical amplifiers, outlining the attributes and application areas for these devices. [8] Explain with the aid of suitable diagrams, Beam splitter and Directional coupler. [8] OR Sketch the major elements of a fiber amplifier and describe the operation of the device.Indicate the benefits of fiber amplifier technology in comparison with that associated with silicon laser amplifiers (SLAs).[10] Discuss Integrated Optics . [6] [3864]-294 zzzz 2

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