Optical Communication (BEC057) - AKTU Question Paper 2024-25
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 2024-25. 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:2024-25
University:AKTU / UPTU
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Questions Asked in 2024-25
Optical Communication (BEC057) — extracted question text · 70 marks · 3 Hours
Section AAttempt all questions in brief. 2 x 07 = 14
- aWhy does fiber optics promise to be the technology of choice f or local area network?
- bCalculate the velocity of light within glass having refractive index (n) equal to 1.5?
- cSpecify three peak wavelengths for the transparent windows in modern optical fibers
- dDefine the term Photoluminescence. 4 1
- eSuppose a laser diode radiates re d light with wavelength of 65 0 nm. Calculate the energy of a single photon?
- fHow does photo diode converts li ght into electrical signal? 5 2
- gDifferentiate between coherent and non-coherent detection technique. 5 2
Section BAttempt any three of the following: 07 x 3 = 21
- aDraw a block diagram of fiber optic communications system an d describe the function of each component
- bDefine the term dispersion in optical fiber. How much will a light pulse spread after travelling along 5 km of a step index fiber whose numerical aperture is 0.275 and refractive index of the core is 1.487?
- cWith suitable energy band diag ram explain the mechanisms of absorption, spontaneous, and stimulated emission in a compound semiconductor?
- dExplain the principle of operation of a quantum well laser d iode? 4 2
- eWith suitable block diagram ex plain Wavelength Division Multiplexing technique in optical fiber communication?
Section CAttempt any one part of the following: 07 x 1 = 07
- aWrite the significance of tot al internal reflection in an op tical fiber. The refractive index of core and cladding of a silica fiber are 1.4 8 and 1.46 respectively. Calculate the cri tical propagation angle? Find th e total acceptance angle of the fiber?
- bWrite short notes on: i. Dispersion shifted and dispersion flattened fiber ii. Polarization mode dispersion
- aExplain basic techniques used to couple light from an LED in to an optical fiber? Calculate the power coupled into a step index mu ltimode fiber whose n 1 = 1.48 and whose n 2 = 1.46 if the surface light emitting diode (SLED) radiates 100 µW?
- bDraw a graph depicting the t ypical input-output relationship i n a l a s e r diode and explain what mechanisms determine the course of the graph?
- aWith suitable diagram explain the working of edge light emit ting diode (ELED) and surface light emitting diode (SLED)?
- bWrite short note on: i. Dark Current ii. Bit Error Rate
- aHow does responsivity depend on the wavelength of an optical signal? The responsivity of a photodiode is 0.85 A/W and the input powe r saturation is 1.5 mW. Calculate the photocurrent if the inciden t power is
- bWrite the major advantages of Avalanche Photo Diode over p-i -n photodiode
- aWhat do you mean by mode coupling? Explain the various irregularities in the fiber of its causes
- bDraw a functional block diagra m of a receiver and briefly ex plain the function of each component?
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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