Vapor – Phase Deposition Techniques

Optical Communications

This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “Vapor – Phase Deposition Techniques”.

1. Which of the following is not a technique for fabrication of glass fibers?
a) Vapor phase oxidation method
b) Direct melt method
c) Lave ring method
d) Chemical vapor deposition technique

2. _____________ technique is method of preparing extremely pure optical glasses.
a) Liquid phase (melting)
b) Radio frequency induction
c) Optical attenuation
d) Vapor Phase Deposition (VPD)

3. Which of the following materials is not used as a starting material in vapor-phase deposition technique?
a) SiCl4
b) GeCl4
c) O2
d) B2O3

4. P2O5 is used as a _____________
a) Dopant
b) Starting material
c) Cladding glass
d) Core glass

5. How many types of vapor-phase deposition techniques are present?
a) One
b) Two
c) Three
d) Four

6. ___________ uses flame hydrolysis stems from work on soot processes which were used to prepare the fiber with losses below 20 dB/km.
a) Outside vapor phase oxidation
b) Chemical vapor deposition
c) Liquid phase melting
d) Crystallization

7. Complete the given reaction.

SiCl4 + 2H2O → SiO2 + ______

a) 2HCl
b) 4HCl
c) 2Cl2
d) 4Cl2

8. In modified chemical vapor deposition, vapor phase reactant such as _________ pass through a hot zone.
a) Halide and oxygen
b) Halide and hydrogen
c) Halide and silica
d) Hydroxides and oxygen

9. _________ is the stimulation of oxide formation by means of non-isothermal plasma maintained at low pressure in a microwave cavity surrounding the tube.
a) Outside Vapor Phase Oxidation (OVPO)
b) Vapor Axial Deposition (VAD)
c) Modified Chemical Vapor Deposition (MCVD)
d) Plasma-activated Chemical Vapor Deposition (PCVD)

10. Only graded index fibers are made with the help of vapor-phase deposition techniques.
a) True
b) False

11. Modified Chemical Vapor Deposition (MCVD) process is also called as an inside vapor phase oxidation (IVPD) technique.
a) True
b) False

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