光学
频率偏差
物理
频率调制
傅里叶变换
分辨率(逻辑)
材料科学
自动频率控制
电信
计算机科学
带宽(计算)
量子力学
人工智能
作者
Weiqiang Lyu,Zhengkai Li,Lingjie Zhang,Zhen Zeng,Zhiyao Zhang,Shangjian Zhang,Yong Liu
出处
期刊:Optics Express
[Optica Publishing Group]
日期:2023-11-27
卷期号:31 (25): 41635-41635
摘要
A high-resolution real-time Fourier transform scheme is proposed and demonstrated based on injecting an optical frequency comb (OFC) into a frequency shifting loop (FSL). Through setting the frequency interval between neighboring teeth in the coherent OFC to be equal to an integer multiple of the frequency shift and also the free spectral range of the FSL, the number of the effective signal replicas from the FSL is increased by M times, where M is the tooth number of the OFC. Hence, it breaks the limitation on the number of round trips due to the gain saturation effect and the cumulative amplified spontaneous emission noise in the FSL under a single optical carrier injection, which greatly enhances the frequency resolution. In the experiment, a coherent three-tone optical carrier is injected into an FSL to realize real-time spectrum analysis, where the frequency resolution is enhanced by three times compared with that by using a single-tone optical carrier injection, i.e., from 60 kHz to 20 kHz.
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