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arXiv 2004.08696physics.opticsphysics.app-ph
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基于光谱模式识别的光子温度和波长测量

Photonic Temperature and Wavelength Metrology by Spectral Pattern Recognition

Siegfried Janz, Ross Cheriton, Dan-Xia Xu, Aadam Densmore, Sergey Dedyulin, Andrew Todd, Jens Schmid, Pavel Cheben, Martin Vachon, Mohsen Kamandar Dezfouli, Daniele Melati

摘要:

光谱模式识别用于测量温度,并使用单个硅波导环形谐振器产生校准的波长/频率梳。该环产生两个不相称的交错TE和TM光谱梳,其随温度独立地移位以创建在每个温度下唯一的光谱图案。在初始校准之后,可以通过识别光谱谐振模式来确定环温度,并且因此也知道每个谐振的波长。提出了两种基于模式的温度反演方法。在第一种方法中,环被锁定到先前确定的温度设定点,该温度设定点由仅两个特定的TE和TM腔模式的重合限定。基于在设定点处的先前校准,环温度以及因此所有谐振波长然后是已知的,并且所得到的梳可以用作波长校准参考。在该配置中,通过使用片上微加热器来调谐环,在80 nm范围内以5 pm的精度再现了所有参考梳波长。对于更一般的光子测温,光谱相关算法的开发,以识别跨越30 nm宽的光谱窗口的谐振模式,从而确定环温度连续到50 mK的精度。的相关性方法扩展到同时确定温度,并识别和校正波长校准误差的询问光源。温度和梳状波长精度主要受环谐振的线宽限制,精度和分辨率与环品质因数成比例。

英文摘要:

Spectral pattern recognition is used to measure temperature and generate calibrated wavelength/frequency combs using a single silicon waveguide ring resonator. The ring generates two incommensurate interleaving TE and TM spectral combs that shift independently with temperature to create a spectral pattern that is unique at every temperature. Following an initial calibration, the ring temperature can be determined by recognizing the spectral resonance pattern, and as a consequence the wavelength of every resonance is also known. Two methods of pattern based temperature retrieval are presented. In the first method, the ring is locked to a previously determined temperature set-point defined by the coincidence of only two specific TE and TM cavity modes. Based on a prior calibration at the set-point, the ring temperature and hence all resonance wavelengths are then known and the resulting comb can be used as a wavelength calibration reference. In this configuration, all reference comb wavelengths have been reproduced within a 5 pm accuracy across an 80 nm range by using an on-chip micro-heater to tune the ring. For more general photonic thermometry, a spectral correlation algorithm is developed to recognize a resonance pattern across a 30 nm wide spectral window and thereby determine ring temperature continuously to 50 mK accuracy. The correlation method is extended to simultaneously determine temperature and to identify and correct for wavelength calibration errors in the interrogating light source. The temperature and comb wavelength accuracy is limited primarily by the linewidth of the ring resonances, with accuracy and resolution scaling with the ring quality factor.

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