Telecommunications Fiber Optics 3

Question 1

What does DWDM stand for?

Accepted Answer

Dense Wavelength Division Multiplexing

Answer

DWDM (Dense Wavelength Division Multiplexing) packs many closely spaced wavelengths onto a single fiber, enabling terabit-capacity links.

Question 2

What is a fiber optic splice closure used for?

Accepted Answer

Protect and house fiber splices in outdoor or underground environments

Answer

A splice closure is an enclosure that protects fiber splices from environmental exposure in aerial, underground, or direct-buried installations.

Question 3

Which multimode fiber type offers the highest bandwidth-distance product?

Accepted Answer

OM5

Answer

OM5 (wideband multimode fiber) is the latest standard, supporting SWDM across four wavelengths for the highest multimode capacity.

Question 4

What is the typical core diameter of single-mode fiber?

Accepted Answer

8-10 µm

Answer

Single-mode fiber has a core diameter of approximately 8-10 µm, which allows only one propagation mode of light.

Question 5

What causes back-reflection in fiber optic connectors?

Accepted Answer

Light reflected back toward the source at connector interfaces

Answer

Back-reflection (optical return loss) occurs when a portion of light reflects back toward the transmitter at connector or splice interfaces.

Telecommunications Practice Test