Frequency noise measurement and its uncertainty estimation of an optical frequency comb using a delay line interferometer
Frequency noise measurement and its uncertainty estimation of an optical frequency comb using a delay line interferometer
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DOI：
10.1088/1361-6501/ab9f1e
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发表时间：
2020-10
影响因子：
2.4
通讯作者：
M. Wada;F. Hong;H. Inaba
中科院分区：
文献类型：
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作者：
M. Wada;F. Hong;H. Inaba
本文描述了在没有低噪声参考激光器的情况下，利用迈克尔逊型光纤延迟线干涉仪，用延迟自外差法测量光频梳的频率噪声。我们测量了自由运行和稳频梳状模式的频率噪声功率谱密度（PSD），并估计了测量结果的不确定度。例如，对于稳频梳，在10 kHz的傅立叶频率下，测得的频率噪声PSD及其不确定性分别为23 dBHz2 Hz−2和0.66 dB。我们还测量了梳状模的频率噪声PSD的常规方法使用超稳参考激光，并与我们测量的结果与延迟自外差法。两种方法的测量结果在各自的不确定度范围内是一致的，说明延迟自外差法具有较高的可靠性。这与其简单性和用户友好性相结合，表明该方法有可能成为频率梳的标准频率噪声测量方法。
We describe frequency noise measurements for an optical frequency comb by using a delayed self-heterodyne method with a Michelson-type fiber-optic delay line interferometer without a low-noise reference laser. We measured the frequency noise power spectral densities (PSDs) for free-running and frequency-stabilized comb modes and estimated the uncertainties of the measurement results. For example, for the frequency-stabilized comb, the measured frequency noise PSD and its uncertainty were 23 dBHz2 Hz−2 and 0.66 dB, respectively, at a Fourier frequency of 10 kHz. We also measured the frequency noise PSDs of the comb modes by the conventional method using an ultrastable reference laser and compared the results with those that we measured with the delayed self-heterodyne method. The measurement results that we obtained with the two methods were consistent within their uncertainties, which shows that the delayed self-heterodyne method provides high reliability. This combined with its simplicity and user-friendliness suggest that the method has the potential to become a standard frequency noise measurement approach for frequency combs.