Fibre Optic and Total Internal Reflection Review Questions and Answers Latest Update Graded A+
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Course
Fibre Optic
Institution
Fibre Optic
Fibre Optic and Total Internal Reflection Review Questions and Answers Latest Update Graded A+
Total Internal Reflection - Answers When light strikes the boundary of a medium at an angle larger than the critical angle, it is completely reflected back into the original medium.
Silicon Dioxide - An...
Fibre Optic and Total Internal Reflection Review Questions and Answers Latest Update Graded A+
Total Internal Reflection - Answers When light strikes the boundary of a medium at an angle larger than
the critical angle, it is completely reflected back into the original medium.
Silicon Dioxide - Answers Material used for the core of fibre optics, with cladding doped to lower
refractive index.
Impurities - Answers Foreign substances in the fibre causing light scattering, weakening the signal;
solved by repeaters/amplifiers.
Repeaters - Answers Devices that convert weakened optical signals into electrical ones, then back to
amplified optical signals, with latency and complexity costs.
Amplifiers - Answers Devices containing doped optical fibre (e.g., erbium doped fibre amplifier) to
amplify optical signals, preferred over repeaters.
Single Mode Fibre - Answers Carries light in a single path over long distances, with high information
capacity and low attenuation.
Multimode Fibre - Answers Has a wider core, allowing light to travel down multiple paths
simultaneously, used in data centres and local area networks.
Scattering - Answers Light collides with impurities in the glass, with scattering proportional to the
inverse fourth power of the wavelength (Raleigh scattering).
Absorption - Answers Light is absorbed and converted into heat by molecules in the glass, primarily by
residual OH+ and dopants.
Dispersion - Answers Distortion of the signal along the fibre length due to different spectral components
traveling at different speeds.
Bend-induced Loss - Answers Micro-bending and macro-bending cause light to 'leak' out of the fibre,
affecting signal transmission.
Numerical Aperture (NA) - Answers Dimensionless number related to the angle of the widest cone of
light that can enter and be guided along the fibre, determining its light-gathering ability.
Core Diameter - Answers Parameter indicating the fibre's mode of operation and light-carrying capacity.
Attenuation Coefficient - Answers Measure of how much incident light is weakened by the fibre
material.
Comparisons with Copper - Answers Contrasting benefits of fibre optics over copper cables, including
higher bandwidth, speed, lower attenuation, security, and durability.
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