Inoue Masaaki, Koshikiya Yusuke, Fan Xinyu, Ito Fumihiko
NTT Access Network Service Systems Laboratories, NTT, 1-7-1, Hanabatake, Tsukuba, Ibaraki 305-0805, Japan.
Opt Express. 2011 Oct 10;19(21):19790-6. doi: 10.1364/OE.19.019790.
A novel method for characterizing the amplitude of a coherence function with respect to a delay between two optical waves is proposed and demonstrated by using a distributional Rayleigh speckle analysis based on C-OFDR. This technique allows us to estimate both the coherence time of the laser and that of the spectral profiles from the measured amplitude of the coherence function, if the symmetry of the spectrum can be assumed. The spectral width obtained in the experiment agrees roughly with that obtained using a delayed self-heterodyne method.
提出了一种用于表征相干函数幅度相对于两束光波之间延迟的新方法，并通过基于C-OFDR的分布瑞利散斑分析进行了演示。如果可以假设光谱的对称性，该技术使我们能够从测量的相干函数幅度中估计激光的相干时间以及光谱轮廓的相干时间。实验中获得的光谱宽度与使用延迟自外差法获得的光谱宽度大致相符。
