A wideband, high-resolution vector spectrum analyzer for integrated photonics

Yi-Han Luo; Baoqi Shi; Wei Sun; Ruiyang Chen; Sanli Huang; Zhongkai Wang; Jinbao Long; Chen Shen; Zhichao Ye; Hairun Guo; Junqiu Liu

doi:10.1038/s41377-024-01435-z

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A wideband, high-resolution vector spectrum analyzer for integrated photonics

Article

- A wideband, high-resolution vector spectrum analyzer for integrated photonics
- Light: Science & Applications Vol. 13, Issue 4, Pages: 760-771(2024)
- Affiliations：
- Author bio：
  
  mliujq@iqasz.cn
- Funds：
- DOI：10.1038/s41377-024-01435-z
  CLC：
- Received：10 October 2023，
  
  Revised：14 March 2024，
  
  Accepted：2024-03-20，
  
  Published Online：08 April 2024，
  
  Published：2024-12
- Accepted：
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Yi-Han Luo, Baoqi Shi, Wei Sun, et al. A wideband, high-resolution vector spectrum analyzer for integrated photonics[J]. Light: science & applications, 2024, 13(4): 760-771.
DOI：

Yi-Han Luo, Baoqi Shi, Wei Sun, et al. A wideband, high-resolution vector spectrum analyzer for integrated photonics[J]. Light: science & applications, 2024, 13(4): 760-771. DOI： 10.1038/s41377-024-01435-z.

摘要

Abstract

The analysis of optical spectra—emission or absorption—has been arguably the most powerful approach for discovering and understanding matter. The invention and development of many kinds of spectrometers have equipped us with versatile yet ultra-sensitive diagnostic tools for trace gas detection

isotope analysis

and resolving hyperfine structures of atoms and molecules. With proliferating data and information

urgent and demanding requirements have been placed today on spectrum analysis with ever-increasing spectral bandwidth and frequency resolution. These requirements are especially stringent for broadband laser sources that carry massive information and for dispersive devices used in information processing systems. In addition

spectrum analyzers are expected to probe the device’s phase response where extra information is encoded. Here we demonstrate a novel vector spectrum analyzer (VSA) that is capable of characterizing passive devices and active laser sources in one setup. Such a dual-mode VSA can measure loss

phase response

and dispersion properties of passive devices. It also can coherently map a broadband laser spectrum into the RF domain. The VSA features a bandwidth of 55.1 THz (1260–1640 nm)

a frequency resolution of 471 kHz

and a dynamic range of 56 dB. Meanwhile

our fiber-based VSA is compact and robust. It requires neither high-speed modulators and photodetectors nor any active feedback control. Finally

we employ our VSA for applications including characterization of integrated dispersive waveguides

mapping frequency comb spectra

and coherent light detection and ranging (LiDAR). Our VSA presents an innovative approach for device analysis and laser spectroscopy

and can play a critical role in future photonic systems and applications for sensing

communication

imaging

and quantum information processing.

关键词

Keywords

references

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