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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Advanced noise reduction techniques for ultra-low phase noise optical-to-microwave division with femtosecond fiber combs
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Advanced noise reduction techniques for ultra-low phase noise optical-to-microwave division with femtosecond fiber combs

机译：先进的降噪技术，用于使用飞秒光纤梳进行超低相位噪声的光-微波分离

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摘要

We report what we believe to be the lowest phase noise optical-to-microwave frequency division using fiber-based femtosecond optical frequency combs: a residual phase noise of –120 dBc/Hz at 1 Hz offset from an 11.55 GHz carrier frequency. Furthermore, we report a detailed investigation into the fundamental noise sources which affect the division process itself. Two frequency combs with quasi-identical configurations are referenced to a common ultrastable cavity laser source. To identify each of the limiting effects, we implement an ultra-low noise carrier-suppression measurement system, which avoids the detection and amplification noise of more conventional techniques. This technique suppresses these unwanted sources of noise to very low levels. In the Fourier frequency range of ȣC;200 Hz to 100 kHz, a feed-forward technique based on a voltage-controlled phase shifter delivers a further noise reduction of 10 dB. For lower Fourier frequencies, optical power stabilization is implemented to reduce the relative intensity noise which causes unwanted phase noise through power-to-phase conversion in the detector. We implement and compare two possible control schemes based on an acousto-optical modulator and comb pump current. We also present wideband measurements of the relative intensity noise of the fiber comb.
机译：我们报告了使用基于光纤的飞秒光学频率梳所产生的最低的相位噪声光-微波频分：从11.55 GHz载波频率偏移1 Hz时，残留相位噪声为–120 dBc / Hz。此外，我们报告了对影响划分过程本身的基本噪声源的详细调查。准相同配置的两个频率梳以一个普通的超稳定腔激光源为参考。为了确定每种限制效应，我们实现了超低噪声载波抑制测量系统，该系统避免了更常规技术的检测和放大噪声。该技术将这些不需要的噪声源抑制到非常低的水平。在200°C至100 kHz的傅立叶频率范围内，基于压控移相器的前馈技术可进一步降低10 dB的噪声。对于较低的傅立叶频率，可实现光功率稳定化，以降低相对强度噪声，该噪声会通过检测器中的功率-相位转换而引起有害的相位噪声。我们基于声光调制器和梳状泵电流来实现和比较两种可能的控制方案。我们还提出了光纤梳相对强度噪声的宽带测量。

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