300-420 Question 169
Single answerYour organization is planning to deploy a Dense Wavelength Division Multiplexing (DWDM) solution to connect data centers across a metropolitan area. One of the requirements is to maximize the number of channels supported while maintaining signal integrity over long distances. Which feature of DWDM should be prioritized to meet this requirement?
- A
Use of Erbium-Doped Fiber Amplifiers (EDFAs)
- B
Implementation of Coarse Wavelength Division Multiplexing (CWDM)
- C
Integration of Optical Add-Drop Multiplexers (OADMs)
- D
Utilization of forward error correction (FEC)
Show answer and explanation
Correct answer: A
Explanation
To meet the requirement of maximizing the number of channels while maintaining signal integrity over long distances, the use of Erbium-Doped Fiber Amplifiers (EDFAs) is essential. EDFAs amplify the optical signal directly, enabling DWDM systems to support multiple channels over extended distances without signal degradation or the need for electrical regeneration. Other options address different aspects of DWDM functionality but do not specifically solve the given challenge.
- A. Correct.
Erbium-Doped Fiber Amplifiers (EDFAs) are crucial for boosting optical signals in DWDM systems over long distances without requiring electrical conversion, ensuring both signal integrity and support for a high number of channels.
- B. Incorrect.
Coarse Wavelength Division Multiplexing (CWDM) supports fewer channels compared to DWDM and is less suited for long-distance transmission, making it an inappropriate choice in this scenario.
- C. Incorrect.
Optical Add-Drop Multiplexers (OADMs) allow selective adding or dropping of wavelengths but do not directly address the requirement for maintaining signal integrity over long distances or maximizing channel capacity.
- D. Incorrect.
Forward error correction (FEC) improves data integrity by correcting errors in the transmitted signal, but it does not directly influence the number of supported channels or enhance distance capabilities in DWDM systems.