Fiber Optics Components & Devices Question Paper 2014 is given below. This question paper was asked the 1st semester BPUT M.Tech Electronics branch (Communication Engineering, Communication System, Electronics & Communication Engineering, Electronics & Telecommunication Engineering). The question carries 10 short questions and 7 long question. Prepare this BPUT Electronics M.Tech previous year question to score good marks. You can also download the question papers in Pdf format.
Fiber Optics Components & Devices Question Paper 2014
1st Semester Regular/ Back Papers 2014
Fiber Optics Components & Devices
Branch : Communication Engineering, Communication System, Electronics & Communication Engineering, Electronics & Tele Communication Engineering
Time : 3 Hours
Max. Marks : 70 Marks
Q1. Answer the following questions.
a) Why is singlemode fiber less costly than multimode fiber ?
b) A photodiode has a capacitance of 10pF. Calculate the maximum load resistance which allows 10 MHz post detection bandwidh.
c) Why do you need to clean fiber optic connectors ?
d) Write the expression for angular misalignment and explain the term ?
e) Draw the equivalent circuit for digital optical fiber receiver including the various noises sources.
f) Define fiber splicing ?
g) Compare p-n photodiode with p-i-n photodiode?
h) The Fresnel reflection at a butt joint with an air gap in a multimode step index fiber is 0.49 dB. Find the refractive index of the core?
i) Define Meridional ray and skew ray?
j) What is population inversion and optical pumping?
Q2.
a) How are the following elements constructed ? Expain their role in WDM networks.
i. Multilayer dielectric thin film filter.
ii. Mach-Zehnder interferometers.
Q3.
a) Explain the mechanism of intermodal dispersion in a multimode step index filter.
b) A pin photo diode on average generates one electron hole pair per incident photons wavelength of 0.8µm. Assuming all the electrons are collected.
Calcualte
i) The quantum efficiency of the device.
ii) Its maximum possible band gap energy.
iii) The mean output photo current when the received optical power is 10^-6 W.
Q4.
a) Expalin witn the necessity diagram the different types of fiber structures.
b)
Q5. Derive the expression for different noise sources in an optical receiver.
Q6.
a) What are the different types of optical fiber couplers and expalin their working ?
b) Explain the impact ionization and avalanche effect in the avalanche photodiodes (APD).
Q7.
a) A silica optical filter with a core diameter large enough to be considered by ray theory analysis has a core refractive index of 1.6 and cladding refractive index of 1.46. Determine
i) The critical angle at the coore cladding interface.
ii) The numerical aperture for the fiber.
iii) The acceptance angle in air for the fiber.
b. Explain the different types of bending losses in optical fibers.
Q8. Describe any TWO from the following.
a) Passive optical couplers.
b) Laser diode structures.
c) OTDM
d) Integrated optics
e) Fusion splices
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