Test Bank Solution Manual for Optical Fibres & Refraction + Waves and Diffraction
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Course
Fibre Optic
Institution
Fibre Optic
Test Bank Solution Manual for Optical Fibres & Refraction + Waves and Diffraction
Explain how the glass cladding around the optical fibre's core improves the security of data being transmitted through it
give a reason why this is important. - Answers *light does not enter the cladding so c...
Test Bank Solution Manual for Optical Fibres & Refraction + Waves and Diffraction
Explain how the glass cladding around the optical fibre's core improves the security of data being
transmitted through it
give a reason why this is important. - Answers *light does not enter the cladding so cannot pass across
from one fibre to a neighbouring fibre* (1)
fibres without cladding can allow light to pass between fibres when the surface of the fibre becomes
scratched (1)
personal data (such as bank account information) must be transmitted along fibres from which there is
no danger of leakage of light resulting in a breach of security (1)
Give 4 properties of Lasers - Answers monochromatic waves of single frequency/wavelength
collimated produces an approximately parallel beam
coherent waves produced are in constant phase
polarised vibrations in 1 plane only
What does coherent mean? - Answers Constant phase diff
Explain why the pulse has a lower amplitude and is longer after it has travelled some distance - Answers
reduced amplitude due to absorption/energy loss within the fibre
Why do optical fibres need cladding? - Answers keeps signals secure (1)
maintains quality/reduces pulse broadening (1)
it keeps (most) light rays in the core due to total internal reflection at the cladding-core boundary (1)
it prevents scratching of the core (1)
keeps core away from adjacent fibre cores so helps to prevent crossover of information/signal/data to
other fibres (1)
cladding provides (tensile) strength for fibre/prevents breakage (1)
given that the core needs to be very thin
Why is the core made as narrow as possible? - Answers -less light is lost
•better quality signal / less distortion
•increased probability of TIR
•Less change of angle between each reflection
• (angle of incidence is) less likely to fall below the critical angle
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