Optical Communication (BEC057) - AKTU Question Paper 2025-26
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 2025-26. 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:2025-26
University:AKTU / UPTU
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Questions Asked in 2025-26
Optical Communication (BEC057) — extracted question text · 70 marks · 3 Hours
Section AAttempt all q u e s t i o n s i n b r i e f . 2 x 07 = 14
- aDefine goos- haenchen shift in opt ical fiber waveguide
- bExplore why the Refractive Inde x (R.I.) of core and cladding are different. Which one has greater R.I. and why
- cWhat are the causes of attenua tion in optical communication? 2 K 2
- dSuppose a laser diode radiates red light with wavelength of 650 nm. Calculate the energy of a single photon?
- eWhat are advantages and disadva ntages of Avalanche Photodiodes
- fDefine the term Photoluminescence
- gDefine Coherent Detection
Section BAttempt any three o f t h e f o l l o w i n g : 07 x 3 = 21
- aWhat is the relationship between acceptance angle and refrac tive indices of core, cladding and medium for a light ray incident on fiber core? Calculate Numerical aperture of step index fiber having core refractive index of 1.57 and cladding refractive index as 1.40
- bDiscuss various kinds of losse s that an optical signal might suffer while propagating through fiber, which i s most important one? What is the effect of these losses on light power and pulse shape?
- cDraw the structures of edge -emitting LED and surface emitting LED and explain the operation
- dDescribe the different sourc e–fiber coupling techniques used in optical fiber communication systems. Compare LED–fiber and laser–fiber coupling methods
- eWrite a short note on: 1.Free Space Optics (FSO) 2.Multiplexin
- gTransmission Techniques
Section CAttempt any one p a r t o f t h e f o l l o w i n g : 07 x 1 = 07
- aDraw and Explain the optical fiber communication system and Describe each component in detail
- bWhat do you mean by Numerical Aperture of an optical fiber? Derive an expression for Acceptance angle of optical fiber
- aWhat do you mean by mode coupling? Explain the various irreg ularities in the fiber of its causes
- bWhat is mean by dispersion? Des cribe the Intramodal dispersion
- aDefine population inversion. Derive the threshold condition for laser oscillation to sustain
- bDiscuss the LASER diode prin ciple , modes and threshold conditions
- aDescribe the working principle of PIN photodiode with proper diagram
- bExplain the source-to-fiber power launching concept in optic al communication systems. Derive the expression for launched power considering geometrical and Fresnel losses
- aExplore Power Penalty in optical communication. Also Explain Different Types of Power Penaltie s. Explore Error Control Techn iques in detail
- bDraw and explain the block diagram of optical receiver. How it is different from Optical photodiodes. Explain its advantages
Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.
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