CFOT Fiber Optic System Components and Equipment

Question 1

What is the primary function of an optical amplifier (EDFA) in a fiber optic network?

Accepted Answer

Amplify optical signals directly without converting to electrical signals

Answer

Convert optical signals to electrical and back

Answer

Regenerate the clock signal in digital transmission

Answer

Filter noise from incoming optical wavelengths

Question 2

What type of laser is most commonly used as the optical source in single-mode fiber optic transceivers?

Accepted Answer

Fabry-Perot (FP) or Distributed Feedback (DFB) laser

Answer

Vertical Cavity Surface Emitting Laser (VCSEL) only

Answer

LED (Light Emitting Diode)

Answer

Neodymium YAG laser

Question 3

A VCSEL (Vertical Cavity Surface Emitting Laser) operating at 850 nm is most commonly paired with which fiber type?

Accepted Answer

OM3 or OM4 multimode fiber

Answer

OS2 single-mode fiber

Answer

OM1 multimode fiber only

Answer

Any fiber type interchangeably

Question 4

What is the purpose of a wavelength division multiplexer (WDM) in a fiber optic system?

Accepted Answer

Combine or separate multiple wavelengths onto a single fiber

Answer

Boost optical power at repeater sites

Answer

Convert multimode signals to single-mode

Answer

Measure optical return loss

Question 5

In fiber optic systems, what does the term 'SFP' stand for and what is its function?

Accepted Answer

Small Form-factor Pluggable — a hot-swappable transceiver module

Answer

Single Fiber Protocol — a bidirectional signaling method

Answer

Spectral Filtering Port — a passive WDM component

Answer

Serial Fiber Patch — a fiber jumper standard

Question 6

What is the role of an optical circulator in a fiber optic network?

Accepted Answer

Route light from one port to the next sequential port, enabling bidirectional transmission on one fiber

Answer

Amplify signals at each port using doped fiber

Answer

Split optical power equally among multiple output ports

Answer

Convert between different wavelength bands