Learn about the key component in WDM systems that converts the client signal to a specific wavelength channel. Detailed explanation for Nokia 4A0-205 exam prep.
Table of Contents
Question
What is the block that converts the colorless (or black and white) client signal to a specific optical channel in a WDM system?
A. Wavelength router (WR)
B. Optical transponder (OT)
C. Static filter device (SFD)
D. Dispersion compensation module (DCM)
Answer
B. Optical transponder (OT)
Explanation
In a wavelength-division multiplexing (WDM) system, the optical transponder (OT) is the component responsible for converting the colorless (black and white) client signal to a specific optical channel or wavelength.
The optical transponder performs several critical functions:
- It receives the client signal, which is typically a standard short-reach interface like Ethernet, Fibre Channel, or SDH/SONET. This signal does not have a specific wavelength associated with it.
- The transponder then converts this client signal into the optical domain and assigns it to a specific wavelength or optical channel. This is done using a laser tuned to the desired wavelength of the channel.
- The output of the transponder is a colored (wavelength-specific) optical signal ready to be multiplexed with other channels in the WDM system.
- On the receive side, the transponder also converts the demultiplexed optical channel back into the client signal format.
The other options are components found in WDM systems but do not perform the specific function of converting the client signal to a wavelength channel:
- The wavelength router (WR) is used to switch and route wavelengths between different fiber paths.
- Static filter devices (SFDs) are used to multiplex and demultiplex the different wavelength channels.
- Dispersion compensation modules (DCMs) are used to compensate for chromatic dispersion in long-haul optical links.
Therefore, the optical transponder (OT) is the correct answer, as it is the block that converts the colorless client signal to a specific optical channel in a WDM system.
Nokia 4A0-205 certification exam assessment practice question and answer (Q&A) dump including multiple choice questions (MCQ) and objective type questions, with detail explanation and reference available free, helpful to pass the Nokia 4A0-205 exam and earn Nokia 4A0-205 certification.