Sawai Shota, Kawauchi Hikaru, Hirosawa Kenichi, Kannari Fumihiko
Opt Express. 2013 Oct 21;21(21):25099-106. doi: 10.1364/OE.21.025099.
We experimentally demonstrate photon-number squeezing at 1.55 μm using a noisy erbium-doped fiber amplifier (EDFA). We employ a collinear balanced detection (CBD) technique, where the intensity noise at a specific radio frequency is canceled between two pulse trains. In spite of substantially large excess noise (>10 dB) in an EDFA due to amplified spontaneous emission, we successfully cancel the intensity noise and achieve a shot noise limit at a specific radio frequency with the CBD technique. We exploit two sets of fiber polarization interferometers to generate squeezed light and observe a maximal photon-number squeezing of -2.6 dB.
我们通过实验证明，使用有噪声的掺铒光纤放大器（EDFA）可在1.55μm波长处实现光子数压缩。我们采用共线平衡检测（CBD）技术，在两个脉冲序列之间消除特定射频处的强度噪声。尽管由于放大自发辐射，EDFA中存在相当大的过量噪声（>10dB），但我们成功利用CBD技术消除了强度噪声，并在特定射频处达到了散粒噪声极限。我们利用两组光纤偏振干涉仪来产生压缩光，并观察到最大光子数压缩为-2.6dB。
