Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV OPTICAL COMMUNICATIONS Previous Question Paper (June - 2024 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART - A
Define modes.
Answer
Modes are the discrete electromagnetic field patterns that satisfy Maxwell's equations and boundary conditions within an optical fiber, representing the stable paths or configurations in which light can propagate.
Mention the characteristics of graded index fiber.
Answer
The refractive index varies parabolically from the center to the cladding, which reduces intermodal dispersion by equalizing the propagation time of different modes. It supports a large number of modes and is primarily used for medium-distance, high-bandwidth applications.
What is attenuation?
Answer
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List the various types of dispersion.
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Define the term Joint Loss.
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Differentiate the splicer and connector.
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Define the term detector response time.
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Compare different types of photodetectors.
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What is WDM?
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List the types of budget in optical communication system.
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PART - B
Write about the historical development of optical fiber communication.
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Explain the light guidance in a optical fiber with figures and explain the total internal reflection and numerical aperture with diagrams.
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Deduce the expressions for fiber Core and Cladding losses.
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Write a note on single-mode fiber connectors.
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With a neat sketch, explain the splicing techniques used in optical fiber.
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Describe the modulation of LED in detail.
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The quantum efficiency of an In GaAs PIN diode is 80% in the wavelength range between 1300nm and 1600nm. Compute the range of responsivity of the PIN diode in the specified wavelength range. Also derive this equation.
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Explain the digital signal transmission for an optical receiver.
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Explain how to measure attenuation and dispersion in optical fiber system.
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Explain the advantage of line coding and also explain any one of the coding techniques with a suitable diagram.
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