EDFA Optical Amplifier ASE Noise Calculator

DWDM & optical communications: Compute Erbium-Doped Fiber Amplifier (EDFA) saturated gain, amplified spontaneous emission (ASE) noise power, Optical Signal-to-Noise Ratio (OSNR), and noise figure.

EDFA Parameters & Input Signal

Small-Signal Gain $G_0$ (dB):

Saturation Output Power $P_{sat}$ (dBm):

Input Signal Power $P_{in}$ (dBm):

Operating Wavelength $\lambda$ (nm):

Noise Figure $NF$ (dB):

Resolution Bandwidth $B_0$ (nm):

Amplifier Gain & Noise Performance

Saturated Gain $G$

dB (power gain)

Output Signal Power $P_{out}$

dBm (amplified carrier)

ASE Noise Power $P_{ASE}$

dBm (@ resolution BW)

Optical SNR (OSNR)

dB (in $B_0 = 0.1$ nm)

Spontaneous Emission $n_{sp}$

Population inversion factor

ASE Spectral Density $S_{ASE}$

pW/Hz (both polarizations)

Output Optical Spectrum (Signal vs ASE Floor)

Amplified Spontaneous Emission (ASE) noise floor establishes the quantum noise floor and dictates cascading multi-span DWDM OSNR degradation.

EDFA Operating Principles & Quantum Limit

Erbium-doped fibers operate as three-level optical amplifiers pumped at 980 nm or 1480 nm. As input signal power approaches or exceeds saturation power, stimulated emission depletes the metastable state population $N_2$, causing gain compression:

          $$G = \frac{G_0}{1 + P_{in}/P_{sat}^{in}} = \frac{G_0}{1 + (G-1)P_{in}/P_{sat}^{out}}$$
          $$P_{ASE} = 2 \, n_{sp} (G - 1) h \nu \Delta \nu_{opt}$$
        

The fundamental quantum limit for an optical amplifier with complete population inversion ($N_2 \gg N_1 \Rightarrow n_{sp} = 1$) is a noise figure of $NF = 3 \text{ dB}$ ($NF_{lin} = 2$). Practical commercial amplifiers typically exhibit $NF \approx 4.5 - 6.0 \text{ dB}$.

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EDFA Optical Amplifier ASE Noise Calculator

EDFA Parameters & Input Signal

Amplifier Gain & Noise Performance

Output Optical Spectrum (Signal vs ASE Floor)

EDFA Operating Principles & Quantum Limit

Frequently Asked Questions