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1997 Course Fiber Optic Communication (Elective II)

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Total No. of Questions : 10] P1271 [Total No. of Pages : 4 [3864]-37 B.E. (E & TC) FIBER OPTIC COMMUNICATION (1997 Course) (404191) (Elective - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) Solve section-I and section-II separately. Solve any three questions from section-I and any three questions from section-II. Assume suitable data if necessary. Figures to the right indicate full marks. SECTION - I Q1) State whether the following statements are true or false and give reasons for the same (any three) : [18] a) Si cannot be used for optic transmission system components in the third window of transmission. b) Single mode fibers are most widely used fiber types. c) Optical Communication is feasible only in the IR range. d) Fiber Optic Communication is restricted to only a few transmission windows. Q2) a) Draw the spectral attenuation curve of optical fiber and mention the different types of loss mechanisms. Explain how these losses can be minimized. [8] b) Determine the cutoff wavelength for the single mode operation of an optical waveguide having radius 8 m, core refractive index 1.47 and fractional index difference of 0.002. [8] Q3) a) Describe in detail the various modes of propagation in optical fibers.[8] b) Explain the difference between : LASER and LED. [8] Q4) a) A silicon p-i-n photodiode has a quantum efficiency of 85% at the operating wavelength of 0.85 m. Calculate : [8] i) ii) Its responsivity at 0.85 m, The received optical power if the mean photocurrent is 5 A and the received photons at this wavelength. P.T.O.

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