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Chinese Science Bulletin (Chinese Version)

高增益光纤受激布里渊散射放大的大延迟可控慢光

宇兴 夏, 黎 詹, 亮 邢

Published Aug 1, 2009• 0 citations
Publisher

Abstract

可调控光纤慢光作为光缓存器在全光路由通信中具有重要的应用前景. 由于受限于较低的布里渊阈值和较大的信号功率, 传统的光纤布里渊散射慢光增益一般不超过30?dB. 本文提出在短光纤中实现高增益布里渊放大的可调控慢光, 利用短光纤的高阈值有效避免泵浦抽空, 实现高增益的信号放大, 从而提高慢光延迟量. 实验证实采用591.8?m长的单级光纤布里渊放大的非饱和增益达到50?dB, 慢光延迟时间可达到52?ns, 分数延迟量超过1.

DOI
10.1360/csb2009-54-15-2177

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The authors report on the design, simulation, fabrication, and measurement of very long superconducting coplanar waveguide delay lines on 3-in-diameter LaAlO/sub 3/ substrates. Variations of the design involving the addition of a ground plane on the backside of the substrate and for the use of gold wire-bond bridges to electrically connect the in-plane ground planes were investigated. A delay of 45 ns was measured for a line length of 4.3 m. The best response was obtained with wire-bond connections and no backside ground plane. A resonance-free insertion loss of less than 0.01 dB/ns was obtained with a 1.7-GHz bandwidth for NbN at 4.2 K. This is to be compared with a loss of 0.1 dB/ns for a 50-ns 0.141-in OD. (outer diameter) copper coaxial delay line that weighs 1.5 lb and 0.02 dB/ns for a 60-ns 1-in OD copper coaxial delay line that weighs 45 lb.>
Highly efficient fast light propagation of optical pulse at negative group velocity was demonstrated in a single-mode tellurite fiber embedded in a Brillouin laser ring cavity. A maximum advancement of 385 ns and an average time advancement per unit power of 3.77 ns/mW were observed when the cavity was pumped with a 1-MHz sinusoidal wave signal at a power level of 102 mW. Pump loss of 7.9 dB was also monitored at the maximum fast light generation, showing an average slope efficiency of 48.7 ns/dB.
孪生光束是一种明亮的纠缠光束，在量子信息领域具有重要应用。空间结构为贝塞尔分布的光束具有自愈特性，遇到障碍物后能够恢复其贝塞尔分布特性。提出并实现了一种阈值仅为60 mW的低阈值非简并光学参量振荡器。基于工作在阈值以上的非简并光学参量振荡器，实验产生功率为8 mW、强度差压缩为5.1 dB的高斯分布孪生光束。随后，使用贝塞尔光束转换器产生了强度差压缩为5 dB的零阶贝塞尔分布孪生光束。进一步研究了该贝塞尔分布孪生光束经过障碍物后的自愈特性。结果表明，虽然贝塞尔孪生光束的空间分布能够恢复，但是障碍物引入的损耗使得强度差压缩降低。该研究结果为基于贝塞尔分布孪生光束的应用研究提供了参考。
Systematic errors in qubit state preparation arise due to non-idealities in qubit control lines such as impedance mismatch. Using a data-based methodology of short-open-load calibration at a temperature of 30 mK, we report calibrated 1-port scattering parameter data of individual qubit drive line components. At 5 GHz, cryogenic return losses of a 20-dB-attenuator, a 10-dB-attenuator, a 230-mm-long 0.86-mm silver-plated cupronickel coaxial cable, and a 230-mm-long 0.86-mm NbTi coaxial cable were found to be 35−2+3 dB, 33−2+3 dB, 34−2+3 dB, and 29−1+2 dB, respectively. For the same frequency, we also extract cryogenic insertion losses of 0.99−0.04+0.04 dB and 0.02−0.04+0.04 dB for the coaxial cables. We interpret the results using master equation simulation of all XY gates performed on a single qubit. For example, we simulate a sequence of two 5 ns gate pulses (X and Y) through a two-element Fabry–Pérot cavity with 276-mm path length directly preceding the qubit and establish that the return loss of its reflective elements must be >9.7 dB (>14.7 dB) to obtain 99.9% (99.99%) gate fidelity.
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