B.TechSemester 52022-23Optical CommunicationKEC058
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Optical Communication (KEC058) - AKTU Question Paper 2022-23

B.Tech · Semester 5 · Free PDF Download

This is the official AKTU Optical Communication Previous Year Question Paper for B.Tech Semester 5, academic session 2022-23. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech
Semester:Semester 5
Session:2022-23
University:AKTU / UPTU

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Questions Asked in 2022-23

Optical Communication (KEC058) — complete question paper

Section AAttempt all questions in brief. 2 x 10 = 20
  • a
    Define goos- haenchen shift in optical fiber waveguide
  • b
    A silica optical fiber with a c ore diameter large enough to be considered by ray theory analysis has a core refractive index of 1.50 and a cladding refractive index of 1.47. Determine the critical angle at the core–cladding interface
  • c
    What are the causes of attenua tion in optical communication?
  • d
    Define the polarization of light in optical communication
  • e
    A lens-coupled surface-emitting LED launches 190 µW of optical power into a multimode step index fiber when a forward current of 25 mA is f lowing through the device. Determine th e overall power conversion effi ciency when the corresponding forward voltage across the diode is 1.5 V
  • f
    What are the advantages of LED light?
  • g
    When 3x10 11photons each with a wavelength of 0.85 µm are incident on a photodiode, on average 1.2 x 1011electrons are collected at the terminals of the device. Determine the quantum efficiency
  • h
    Define optical detector in optical communication. (i) Define quantum limit in optical communication. (j) What is mean by Eye pattern in optical communication?
Section BAttempt any three of the following: 10 x 3 = 30
  • a
    A silica optical fib er with a core diameter large enough to be considered by ray
    theory analysis has a core refractive index of 1.50 and a cladding refractive
index of 1.47. determine: (i) the critical angle at the core–cladding interface;
(ii) the NA for the fiber; (iii) the acceptance angle in air for the fiber
  • b
    What is mean by dispersion? Des cribe the Intramodal dispersion
  • c
    What are the drawbacks of LEDs in comparison with injection lasers? Describe various type of LED structure with their diagram
  • d
    A germanium p–i–n photodiode with active dimensions of 100 × 50µm has a quantum efficiency of 55% when operating at a wavelength of 1.3 µm. The measured dark current at this wavelength is 8 nA. Calculate the noise equivalent power and specific detectivity for the device. It may be assumed that dark current is the dominant noise source
  • e
    Describe the homodyne detection and heterodyne detection
Section CAttempt any one part of the following: 10 x 1 = 10
  • a
    Draw and explain the basic block diagram of optical fiber communication system and also describe the advantage of optical fiber communication
  • b
    What is graded index fibers i n optical fiber communication? A graded index fiber has a core with a parabolic refractive index profile whic h has a diameter of 50 µm. The fiber has a numerical aperture of 0.2. Estimate t he total number of guided modes propagating in the fiber when it is operating a t a wavelength
  • b
    Describe the various types of nonlinear scattering losses in optical wave guide
  • a
    The radiative and non radiat ive recombination lifetimes of the minority carriers in the active region of a double-heterojunction LED are 80 ns and 100 ns respectively. Determine the total carrier recombination lifetime and the power internally generated within the device when the peak emission wavelength is 0.87µm at a drive current of 40 mA
  • b
    Describe the optical feedbac k and laser oscillation in optical waveguide
  • a
    Describe the working princi ple of PIN photodiode with proper diagram
  • b
    Define the mode of laser a nd describe the threshold conditi on for laser oscillation
  • a
    Explain the basic concept of Free Space Optics (FSO) based communication System with its application in fiber optics
  • b
    Describe the multichannel & multiplexing transmission techniques in fiber optics

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

Repeated Questions — KEC058

Questions that appeared in more than one session, found by comparing 3 years of Optical Communication papers (2021-22, 2022-23, 2023-24)

2x

Describe the multichannel & multiplexing transmission techniques in fiber optics

Appeared in: 2022-23 · 2023-24

Optical Communication — Other Year Papers

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