350-501 · Question #129
What does DWDM use to combine multiple optical signals?
The correct answer is D. wavelength. Dense Wavelength Division Multiplexing (DWDM) combines multiple optical signals by transmitting them simultaneously over a single fiber using distinct wavelengths.
Question
What does DWDM use to combine multiple optical signals?
Options
- Afrequency
- BIP protocols
- Ctime slots
- Dwavelength
How the community answered
(62 responses)- A2% (1)
- B8% (5)
- C5% (3)
- D85% (53)
Why each option
Dense Wavelength Division Multiplexing (DWDM) combines multiple optical signals by transmitting them simultaneously over a single fiber using distinct wavelengths.
While wavelength and frequency are related, DWDM specifically utilizes the distinct wavelength property of light to combine signals, not generic frequency division.
IP protocols operate at a higher network layer and are independent of the physical layer multiplexing technology used by DWDM.
Time Division Multiplexing (TDM) combines signals by allocating different time slots, which is a different multiplexing technique than DWDM's use of wavelengths.
Concept tested: DWDM principle of operation
Source: https://www.cisco.com/c/en/us/products/optical-networking/what-is-dwdm.html
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