Telecommunications Fiber Optics 2 — Questions and Answers
Question 1: What does EDFA stand for and what is its role?
- Erbium-Doped Fiber Amplifier; amplifies optical signals without converting them to electrical (Correct answer)
- Enhanced Data Flow Analyzer; monitors fiber bandwidth
- Electrical Distribution Frame Adapter; converts optical to copper
- External Drive Fiber Array; stores backup data on fiber
Correct answer: Erbium-Doped Fiber Amplifier; amplifies optical signals without converting them to electrical
An EDFA (Erbium-Doped Fiber Amplifier) amplifies optical signals directly in the optical domain, enabling ultra-long-haul transmission.
Question 2: What is insertion loss in a fiber optic link?
- Signal gain added by amplifiers
- The attenuation of optical power through a component or connector (Correct answer)
- Interference from adjacent fibers
- Delay caused by fiber length
Correct answer: The attenuation of optical power through a component or connector
Insertion loss is the reduction in optical signal power (measured in dB) caused by connectors, splices, splitters, and the fiber itself.
Question 3: What connector type is most commonly used in enterprise fiber deployments in the US?
- SC
- ST
- LC (Correct answer)
- FC
Correct answer: LC
LC (Lucent Connector) connectors are the most widely deployed in modern enterprise and data center fiber installations due to their small form factor.
Question 4: What type of fiber splice permanently joins two fibers with minimal loss?
- Mechanical splice
- Fusion splice (Correct answer)
- Connector splice
- Adhesive splice
Correct answer: Fusion splice
Fusion splicing uses an electric arc to melt and fuse two fiber ends together, producing losses typically below 0.1 dB.
Question 5: What is the purpose of a fiber optic attenuator?
- Boost weak optical signals
- Intentionally reduce optical signal power to prevent receiver saturation (Correct answer)
- Split a single fiber into multiple outputs
- Convert multimode to single-mode signals
Correct answer: Intentionally reduce optical signal power to prevent receiver saturation
Fiber attenuators reduce optical signal power to prevent optical receivers from being overloaded by excessively strong signals.
Question 6: What does PON stand for and where is it typically used?
- Point of Node; used in backbone routing
- Passive Optical Network; used in fiber-to-the-home (FTTH) deployments (Correct answer)
- Protocol Over Network; used in VoIP systems
- Power Over Node; used in PoE switches
Correct answer: Passive Optical Network; used in fiber-to-the-home (FTTH) deployments
A PON (Passive Optical Network) is a point-to-multipoint fiber architecture used in FTTH deployments to serve multiple homes from one OLT.
Telecommunications Fiber Optics 2
What does EDFA stand for and what is its role?