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arXiv 1902.02728quant-phphysics.optics
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从可见光到通信C波段量子下变频中的光谱噪声

Spectral noise in quantum frequency down-conversion from the visible to the telecommunication C-band

Peter C. Strassmann, Anthony Martin, Nicolas Gisin, Mikael Afzelius

摘要:

本文详细研究了基于差频产生的可见光-电信光子频率转换器的噪声特性。该器件使用930 nm的强泵浦激光,在周期性极化的锂离子酸盐脊波导中将580 nm的光子转换为1541 nm。在泵浦功率为250 mW时,器件效率最高可达46%(内效率为67%).详细研究了抽运激光器产生的噪声,记录了在电信和可见光区的噪声谱,并测量了噪声率的功率依赖性。电信中的噪声频谱非常宽,正如以前对类似DFG转换器的工作所预期的那样。然而,我们也观察到电信频谱中的几个狭窄的下降,在580 nm噪声频谱中出现相应的峰值。这些特点的解释和频率产生的电信噪声的波长由波导中的不同空间模式的相位匹配条件。建议的噪声模型是在良好的协议与所有的测量数据,包括功率依赖的噪声率,无论是在可见光和电信制度。这些结果适用于泵浦激光波长在输入和目标波长之间的DFG转换器。

英文摘要:

We report a detailed study of the noise properties of a visible-to-telecom photon frequency converter based on difference frequency generation (DFG). The device converts 580 nm photons to 1541 nm using a strong pump laser at 930 nm, in a periodically poled lithium niobate ridge waveguide. The converter reaches a maximum device efficiency of 46 % (internal efficiency of 67 %) at a pump power of 250 mW. The noise produced by the pump laser is investigated in detail by recording the noise spectra both in the telecom and visible regimes, and measuring the power dependence of the noise rates. The noise spectrum in the telecom is very broadband, as expected from previous work on similar DFG converters. However, we also observe several narrow dips in the telecom spectrum, with corresponding peaks appearing in the 580 nm noise spectrum. These features are explained by sum frequency generation of the telecom noise at wavelengths given by the phase matching condition of different spatial modes in the waveguide. The proposed noise model is in good agreement with all the measured data, including the power-dependence of the noise rates, both in the visible and telecom regime. These results are applicable to the class of DFG converters where the pump laser wavelength is in between the input and target wavelength.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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