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Noise figure measurements on Nd and Yb doped double-clad fiber amplifiers

P. Weßels and C. Fallnich

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Abstract

We present comparative noise figure measurements on neodymium and ytterbium doped double-clad fiber amplifiers. While the neodymium doped amplifier showed the quantum-limited noise figure of 3 dB, the ytterbium doped amplifier exhibited excess noise due to its three-level system. We compared optical and electrical methods with respect to the accuracy and the suitability for high power measurements.

©2003 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Setup of the fiber amplifier for the noise figure measurements.

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Fig. 2.
Fig. 2. Spectral hole burning and polarization dependent gain in Nd. The ASE spectral density is higher in the polarization state perpendicular to the main signal due to polarization dependent gain (main figure). The actual ASE-level at the signal level was determined by extrapolation of the ASE-bands on both sides of the main signal (inset).

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Fig. 3.
Fig. 3. Noise figure measurements on the Nd doped amplifier with the electrical (a) and the optical method (b).

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Fig. 4.
Fig. 4. Noise figure measurements on the Yd doped amplifier with the electrical (a) and the optical method (b).

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Equations (5)

Equations on this page are rendered with MathJax. Learn more.

NF = SNR in SNR out = 1 G 2 〈 Δ 2 P out 〉 〈 Δ 2 P in 〉
〈 Δ 2 P out 〉 = G 2 · 〈 Δ 2 P in 〉 + ∣ G − 1 ∣ · 〈 Δ 2 P out 〉 shot
NF ideal = 1 + ∣ G − 1 ∣ G
NF = 〈 Δ 2 I ph 〉 2 · e · 〈 I ph 〉 · G = 〈 Δ 2 I ph 〉 〈 Δ 2 I ph 〉 shot · G
ONF = 2 · ρ ASE G · h · ν + 1 G
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