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2003 Course Optical & Microwave Communication

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Total No. of Questions : 12] P1349 [Total No. of Pages :4 [3764] - 232 B.E. (E & TC) OPTICAL AND MICROWAVE COMMUNICATION (2003 Course) Time : 3 Hours] [Max. Marks:100 Instructions to the candidates: 1) Attempt Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6 from section - I & Q.7 or Q.8, Q.9 or Q.10, Q.11 or Q.12 from section - II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Compare surface Emitting & Edge Emitting structures of LED. [6] Explain the construction & working of APD with the help of neat diagram. [6] Find core radius necessary for single mode operation at 820 nm of step Index fiber with n1 = 1.480 & n2 = 1.478. What is NA and maximum acceptance angle of fiber? Also calculate corresponding solid angle. [6] OR Q2) a) A double heterojunction In GaAs P LED emitting at a peak wavelength of 1310 nm has radiative & nonradiative recombination times of 30 nsec & 100 nsec resp. The drive current is 40 mA. Determine total recombination life time, internal quantum efficiency & internal power level of the source. [6] b) Explain the three transmission windows along with the attenuation curve for single mode fiber. [6] c) Draw the structure of PIN photodiode & explain its operation in brief. Plot the responsivity curve as a function of wavelength for PIN constructed of silicon. [6] P.T.O.

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