H19-410_V1.0 · Question #250
In WDM systems, noise is mainly introduced by EDFA amplifiers.
The correct answer is A. True. In WDM (Wavelength Division Multiplexing) systems, EDFAs (Erbium-Doped Fiber Amplifiers) are the primary source of noise - specifically Amplified Spontaneous Emission (ASE) noise, which accumulates with each amplifier stage along the transmission link. While the optical fiber…
Question
In WDM systems, noise is mainly introduced by EDFA amplifiers.
Options
- ATrue
- BFalse
How the community answered
(46 responses)- A72% (33)
- B28% (13)
Explanation
In WDM (Wavelength Division Multiplexing) systems, EDFAs (Erbium-Doped Fiber Amplifiers) are the primary source of noise - specifically Amplified Spontaneous Emission (ASE) noise, which accumulates with each amplifier stage along the transmission link. While the optical fiber itself introduces attenuation and some nonlinear effects, it contributes negligible noise compared to the amplification stages. Option B is wrong because denying EDFA as the dominant noise source would ignore the well-established role ASE plays in degrading the optical signal-to-noise ratio (OSNR) in long-haul WDM systems.
Memory tip: Think "EDFA = Every Decibel of noise From Amplification" - every time the signal is boosted, spontaneous photon emission adds unwanted noise on top of the desired signal.
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