WGU C172 Network & Security focused on Chapter 3 Exam Review Questions and A Level Marking Scheme Latest 2024/2025
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WGU C172 Network & Security
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WGU C172 Network & Security
WGU C172 Network & Security focused on Chapter 3 Exam Review Questions and A Level Marking Scheme Latest 2024/2025
zero-dispersion wavelength - correct answer point where the dispersion is actually zero
dispersion compensating fiber - correct answer acts like an equalizer, cancelling disper...
WGU C172 Network & Security focused on
Chapter 3 Exam Review Questions and A Level
Marking Scheme Latest 2024/2025
zero-dispersion wavelength - correct answer point where the dispersion is actually
zero
dispersion compensating fiber - correct answer acts like an equalizer, cancelling
dispersion effect and yielding close to zero dispersion in the 1550 micron region
fiber bragg grading - correct answer a short strand of modified fiber that changes the
index of refraction and minimizes the intersymbol interference
optical spectrum - correct answer light frequencies from the infrared on up
2 types of light sources in fiber optic communication - correct answer DL (diode laser)
and LED (light-emitting diode)
preferred light source in moderate to wideband systems - correct answer DL
advantages of LED - correct answer - cheaper
- less complex circuitry
- needs no thermal or optical stabilizations
DFB - correct answer - Distributed Feedback Laser
- a more stable laser suitable for use in DWDM systems
, - incorporates the propagation of several wavelengths in the 1550 nm range for a single
fiber
VCSEL - correct answer - Vertical cavity surface emitting lasers
- Lasers with the simplicity of LEDs and the performance of lasers
tunable laser - correct answer - a special class of laser where the wavelength can be
adjusted by a few nanometers
- ideal for traffic routing in DWDM systems
Terms used to describe fiber optic strand - correct answer - fiber
- light pipe
- glass
isolator - correct answer an inline passive device that allows power to flow in one
direction only
RSL - correct answer - received signal level
- the input signal level to an optical receiver
branching devices - correct answer used in simplex systems where a single optical
signal is divided and sent to several receivers such as point-to-multipoint data or CATV
Distribution System
splitters - correct answer used to split or divide the optical signal for distribution in a
number of places
wavelength division multiplexers - correct answer - combine or divide 2 or more optical
signals with different wavelengths
- aka optical beam splitters
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