Internal assessment 3

Which type of optical fiber is used for long-distance communication?

• Single-mode fiber

• Multimode fiber

• Plastic fiber
  
  

• Gradient index fiber

Which material is commonly used for the core of optical fibers?

• Plastic

• Glass

• Silicon

• Carbon

What phenomenon allows light to be transmitted through optical fibers?

• Reflection

• Refraction

• Diffraction

• Absorption

Which type of optical fiber has a graded refractive index?

• Single-mode fiber

• Multimode step-index fiber

• Multimode graded-index fiber

• Plastic fiber

What is the approximate core diameter of a single-mode fiber?

• 50-62.5 µm

• 8-10 µm

• 100-200 µm
  
  

• 20-40 µm

Which type of fiber suffers the least dispersion?

• Multimode step-index fiber

• Multimode graded-index fiber
  
  

• Single-mode fiber

• Plastic optical fiber

Which material is commonly used in the core of optical fibers?

•  Aluminum

• Silica glass

• Plastic

• Polycarbonate

What is the primary advantage of graded-index multimode fiber over step-index multimode fiber?

• Lower cost

• Higher data rate

• More durable

• Larger core diameter

Which type of optical fiber is best for high-speed data transmission over short distances?

• Single-mode fiber

• Multimode fiber

• Plastic fiber

• Step-index fiber

What is the numerical aperture (NA) of an optical fiber?

• The ratio of the core diameter to cladding diameter

• The measure of light-gathering ability of the fiber

• The refractive index of the core material

• The attenuation per unit length