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Test Bank Solution Manual for Optical Fibres & Refraction + Waves and Diffraction
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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...

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  • October 14, 2024
  • 7
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • optical fibres refraction waves and diffractio

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  • Fibre Optic
  • Fibre Optic

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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



(pulse broadening caused by) multi-path (modal) dispersion

, different rays propagating at different angles



ray take longer time to travel along 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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