H31-341_V2.5 · Question #908
While amplifying business signals, EDFA will also bring noise to the system, which is the main source of noise.
The correct answer is A. True. A (True) is correct because EDFAs (Erbium-Doped Fiber Amplifiers) amplify signals through stimulated emission, but this process is inherently accompanied by Amplified Spontaneous Emission (ASE) - photons emitted randomly by excited erbium ions before stimulated emission occurs…
Question
While amplifying business signals, EDFA will also bring noise to the system, which is the main source of noise.
Options
- ATrue
- BFalse
How the community answered
(69 responses)- A80% (55)
- B20% (14)
Explanation
A (True) is correct because EDFAs (Erbium-Doped Fiber Amplifiers) amplify signals through stimulated emission, but this process is inherently accompanied by Amplified Spontaneous Emission (ASE) - photons emitted randomly by excited erbium ions before stimulated emission occurs. ASE accumulates along the amplifier chain and is universally recognized as the dominant noise source in EDFA-based optical transmission systems, degrading the optical signal-to-noise ratio (OSNR).
Option B is wrong because noise generation in EDFAs is physically unavoidable - it is a direct consequence of the population inversion required for amplification, not a design flaw that can be eliminated.
Memory tip: Think "amplify = amplify everything" - an EDFA cannot selectively boost only the signal; it also boosts (and generates) noise via ASE. The acronym ASE = "Always Some Extra" noise can help you remember that every EDFA stage adds noise to the system.
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