Frequency recovery method for optical-frequency-comb-based down-converted signal reception using optical delay line
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摘要: 针对光频梳下变频信号接收过程中存在的频率信息丢失问题，提出了一种基于频率-相位映射的信号频率恢复方法，该方法使用可调光纤延迟线在两路光频梳变频链路之间产生一组固定已知的时延，时延在信号原始频率与下变频信号相位差之间建立映射关系，利用该映射关系可以从测得的相位差计算出信号的原始频率。分析了时延值等参数对频率恢复的影响，估计了该方法对相位测量不确定度的限值要求，最后给出了该方法具体实施方案中关键参数的设置策略。所有下变频信号的相位差可以通过快速傅里叶变换等数据处理一次性得出，因此该方法的时间代价和计算成本几乎不随着信号个数增加而增加。在不考虑下变频信号混叠的情况下，本文所提出的方法在理论上对处理信号的数量没有限制，因此相比于已有的光频梳下变频信号频率恢复方法，在多信号频率恢复方面更具有优势。Abstract: To recover the missing frequency information in optical-frequency-comb-based down-converted signal receiving, this paper introduces a frequency recovering method based on frequency-phase-mapping. An optical time delay line is used to generate a certain time delay and it builds a frequency-phase-mapping between signal’s frequency and down-converted component’s phase, which can be acquired by data processing. Thus, the frequency can be calculated through the measurable phase and certain time delay. Then, this paper analyzes parameters such as time delay on frequency recovery, estimates the limit requirements of this method for the uncertainty of phase measurement, and finally gives the setting strategy of key parameters in the specific implementation of this method. The number of signals under test is theoretically unlimited as long as the down-converted components are not aliased. Compared to related works, this method has better performance in multi-signals recovery, because its expense in time consumption and data processing is nearly constant as the number of signals increases.
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图 3 频率-相位差测试结果
Figure 3. Results of the phase difference measurements at different frequencies
表 1 实验主要仪器型号参数
Table 1. Main devices of the experiment
device manufacture(version) signal source RIGOL (DSG3120) tunable optical time delay line LIGHTSOS (0-330 ps) oscilloscope R&S (RTO2014,1 GHz,10 GS/s) optical frequency comb made by Beihang University (213.2 MHz) photodector KEYANG (KY-PRM-200M-I-FC) electro optical modulator CONQUER (KG-AM-15-10G) 
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