Tong Zhi, Bogris Adonis, Lundström Carl, McKinstrie C J, Vasilyev Michael, Karlsson Magnus, Andrekson Peter A
Photonics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
Opt Express. 2010 Jul 5;18(14):14820-35. doi: 10.1364/OE.18.014820.
Semi-classical noise characteristics are derived for the cascade of a non-degenerate phase-insensitive (PI) and a phase-sensitive (PS) fiber optical parametric amplifier (FOPA). The analysis is proved to be consistent with the quantum theory under the large-photon number assumption. Based on this, we show that the noise figure (NF) of the PS-FOPA at the second stage can be obtained via relative-intensity-noise (RIN) subtraction method after averaging the signal and idler NFs. Negative signal and idler NFs are measured, and <2 dB NF at >16 dB PS gain is estimated when considering the combined signal and idler input, which is believed to be the lowest measured NF of a non-degenerate PS amplifier to this date. The limitation of the RIN subtraction method attributed to pump transferred noise and Raman phonon induced noise is also discussed.
推导了非简并相位不敏感（PI）光纤光学参量放大器（FOPA）与相位敏感（PS）FOPA级联的半经典噪声特性。结果表明，在大光子数假设下，该分析与量子理论一致。基于此，我们表明，在对信号和闲频噪声系数（NF）进行平均后，可通过相对强度噪声（RIN）减法获得第二级PS-FOPA的NF。测量到了负的信号和闲频NF，并且在考虑信号和闲频输入组合时，估计在PS增益大于16 dB时NF小于2 dB，据信这是迄今为止非简并PS放大器测量到的最低NF。还讨论了归因于泵浦转移噪声和拉曼声子诱导噪声的RIN减法的局限性。
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