Important RGPV Question
EC-801 Optical Fibre Communication
VIII Sem, EC
UNIT 1-Introduction To Vector Nature Of Light
Q.1) Elaborate any five differences between a step index and graded index fiber.
(RGPV May 2022)
Q.2) An optical fiber has a NA of 0.2 and a cladding refractive index of 1.59. Determine the acceptance angle for the fiber in water which has a refractive index of 1.33.
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Q.3) Write an introductory note on normalized frequency. Derive its expression.
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Q.4) Calculate the numerical aperture of step index fiber having n1 = 1.48 and n2 = 1.46. What is the maximum entrance angle Q0 (max) for this fiber if the outer medium is air with n = 1? Also derive the expression used.
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Q.5) Derive an expression for numerical aperture of a step index fiber.
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Q.6) A fiber has a core radius of 25 mm, core refractive index of 1.48 and relative refractive index difference is 0.01. If the operating wavelength is 0.84 mm, find the value of normalized frequency and the number of guided modes. Determine the number of guided modes if D is reduced to 0.03.
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Q.7) Derive an expression to determine the modes propagating in step index fiber.
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Q.8) Draw and explain ray theory transmission in an optical communication.
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Q.9) Derive the expression of numerical aperture in terms of core and cladding refractive index.
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Q.10) Calculate numerical aperture of the step index fiber having core refractive index n1 = 1.48 and cladding refractive index n2 = 1.46. What is the maximum entrance angle for the fiber if outer medium is fiber.
(RGPV May 2024)
UNIT 2-Signal Degradation In Optical Fibre
Q.1)V Explain the scattering and bending losses that occur in optical fiber with suitable diagram.
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Q.2) How signal degraded an optical fiber due to dispersion? Elaborate any case history.
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Q.3) Discuss in detail the intermodal dispersion with relevant expressions and diagrams.
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Q.4) Discuss the attenuation encountered in optical fiber communication due to Scattering and Absorption.
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Q.5) Draw the characteristic of optical fiber attenuation as a function of wave length and explain the properties of the different wavelength windows.
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Q.6) What are the different mechanism causing absorption in optical fiber? How can absorption be reduced.
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Q.7) Explain VAD method of fiber fabrication.
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Q.8) Explain about bending losses and core cladding losses. How can they be reduced.
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Q.9) Explain the working of OTDR.
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UNIT 3-Optical Sources And Detectors
Q.1) What is the resonant frequency of LASER? Derive the expression of wavelength spacing between two modes.
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Q.2) How is modulation of LASER diode done? Explain with a suitable diagram.
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Q.3) Derive an expression for the internal optical power level generated in LEDs.
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Q.4) Explain about Avalanche photo diode.
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Q.5) A ruby LASER containing a crystal length 4 cm with a refractive index of 1.78. The peak emission wavelength from the device is 0.55. Determine the number of longitudinal modes and their frequency separation.
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Q.6) What is quantum efficiency? Derive the expression of quantum efficiency in terms of recombination life time.
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Q.7) With the help of suitable diagram explain the working of PIN diode.
(RGPV May 2024)
UNIT 4-Optical Transceivers
Q.1) Classify and explain various splicing techniques in optical fiber.
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Q.2) Explain the different optical fiber connectors used.
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Q.3) How is eye pattern useful in analyzing the performance of optical transmission?
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Q.4) Derive a relation for digital receiver performance.
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Q.5) Explain the step involved in splicing the fiber. Discuss the various splicing techniques employed between two fibers.
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Q.6) Explain the following in respect of digital link:
i) Point to point links
ii) Power penalties
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Q.7) Discuss the following optical coupler parameters:
i) Splitting ratio
ii) Excess loss
iii) Insertion loss
iv) Cross talk
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Q.8) Calculate the maximum bit rate that may be achieved on the fiber link length of 50 km without repeaters and using NRZ format. Transmitter rise time is 4 ns. Intermodal rise time is 5 ns. Intramodal rise time 1 ns. Receiver rise time is 2 ns.
(RGPV May 2023)
Q.9) Explain in detail the link power budget design analysis for optical link establishment.
(RGPV May 2024)
UNIT 5-Optical Networks And Amplifiers
Q.1) Explain the operating principle of WDM. Write down some applications of WDM.
(RGPV May 2022)
Q.2) Discuss about the MEMS technology. How does it beneficial for WDM? Explain.
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Q.3) Discuss the concept of WDM with neat diagram.
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Q.4) Derive the expression for EDFA conversion efficiency and amplifier gain.
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Q.5) Explain the layers of SONET with neat sketches.
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Q.6) Explain the architecture and working of SONET.
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Q.7) Explain the working of EDFA.
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Extra Questions-
Q.1) Write a short note (any four)
a) EDFA
b) Optical Fiber Connector
c) Raman Amplifier
d) Single Mode Fibers
e) SONEТ
f) Fiber Joints
(RGPV May 2022)
Q.2) Write short notes on any two of the following:
a) LED
b) Splicing
c) Passive optical networks
(RGPV May 2024)
— Best of Luck for Exam —
