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Each full question carries 15 marks.)Urlr - IExplain step index and graded index fibers.Explain the elements of physical optics. OnExplain different modes and configurations of fiber optic fansmission.Describe diflerent twes of fiber materials.Uxrr IIExplain dre working principle of Surface emitting LED.Explain the principle of Avalanche photodiode.OnExplain the construction and working ol LASER diode.Describe PIN photodiode.U",.'n - IIIExplain the block diagram of oplical transmitter.Explain the working principle of Semrconductor optical amplifier C)nExplain the block diagram of optical fiber commmication system.Explain the principle of wavelength division multiplexing.Urrr - IVExplain different methods of measuring attenuation losses in opticalExplain the working principle of optical modulators.OnL,xplarn drtldrent sphcmg technques used in OFC system.Describe optical circulators. 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Gh0wG= ð];G^z(__>> stream TED (15) 5M5(REVTSTON -- 2015) Reg. No.Signature DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY/MANAGEMENT/COMMERCIAL PRACTICE - APzuL, 2019OPTICAL FIBER COMMUNICATION[7)nie: 3 hours(Maximum marks : 100)PART A(Maximum marks : l0)MarksI Answer a/i questions in one or two sentences. Each question carries 2 marks.I . State the principle of Total intemal reflection.2. Name two types of [.ED structures.3. List different types of optical amplifiers.4. List major clements of optical fiber communication system.5. List the applications of optical isolators. (5x2: l0) PART - B(Maximum marks : 30)ll Answer any .fve of the following questions. Each question carries 6 marks.l. Explain meridional and skew rays.2. List the advantages of optical fiber communication system.3. Explain the principle of photoderection.4. Explain modulation process in LED.5. Draw the block diagram of optical receiver.6. Explain star couplers.7. List the requirements ofa good cormeclor. 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