Telecommunications Fiber Optics

Question 1

What physical phenomenon allows fiber optic cables to transmit light?

Accepted Answer

Total internal reflection

Answer

Reflection

Answer

Refraction

Answer

Diffraction

Question 2

What is the difference between single-mode and multimode fiber?

Accepted Answer

Single-mode has a smaller core and supports longer distances; multimode has a larger core for shorter distances

Answer

Single-mode is cheaper; multimode is more expensive

Answer

Single-mode supports more wavelengths; multimode supports only one

Answer

Single-mode is for copper; multimode is for glass

Question 3

What does OTDR stand for and what is it used for?

Accepted Answer

Optical Time Domain Reflectometer; used to test fiber for faults and measure length

Answer

Optical Transmission Data Recorder; used to log network traffic

Answer

Output Transfer Data Rate; used to measure bandwidth

Answer

Optical Terminal Device Router; used to connect fiber to switches

Question 4

What wavelength does standard single-mode fiber primarily use for long-haul transmission?

Accepted Answer

1550 nm

Answer

850 nm

Answer

1310 nm

Answer

1625 nm

Question 5

What does WDM stand for in fiber optics?

Accepted Answer

Wavelength Division Multiplexing

Answer

Wideband Data Multiplexing

Answer

Wireless Data Management

Answer

Waveguide Dense Modulation

Question 6

What causes chromatic dispersion in fiber optic cables?

Accepted Answer

Different wavelengths traveling at slightly different speeds

Answer

Physical bending of the fiber

Answer

Moisture penetration into the cladding

Answer

Connector contamination