Broadband picometer-scale resolution on-chip spectrometer with reconfigurable photonics

Chunhui Yao; Minjias Chen; Ting Yan; Liang Ming; Qixiang Cheng; Richard Penty

doi:10.1038/s41377-023-01195-2

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Broadband picometer-scale resolution on-chip spectrometer with reconfigurable photonics

Original Articles

- Broadband picometer-scale resolution on-chip spectrometer with reconfigurable photonics
- Light: Science & Applications Vol. 12, Issue 7, Pages: 1415-1424(2023)
- Affiliations：
  
  1.Centre for Photonic Systems, Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
  2.GlitterinTech Limited, Xuzhou 221000, China
- Author bio：
  
  Qixiang Cheng (qc223@cam.ac.uk)
- Funds：
- DOI：10.1038/s41377-023-01195-2
  CLC：
- Published：31 July 2023，
  
  Published Online：25 June 2023，
  
  Received：07 January 2023，
  
  Revised：19 May 2023，
  
  Accepted：26 May 2023
- Accepted：
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Yao, C. H. et al. Broadband picometer-scale resolution on-chip spectrometer with reconfigurable photonics. Light: Science & Applications, 12, 1415-1424 (2023).
DOI：

Yao, C. H. et al. Broadband picometer-scale resolution on-chip spectrometer with reconfigurable photonics. Light: Science & Applications, 12, 1415-1424 (2023). DOI： 10.1038/s41377-023-01195-2.

摘要

Abstract

Miniaturization of optical spectrometers is important to enable spectroscopic analysis to play a role in in situ

or even in vitro and in vivo characterization systems. However

scaled-down spectrometers generally exhibit a strong trade-off between spectral resolution and operating bandwidth

and are often engineered to identify signature spectral peaks only for specific applications. In this paper

we propose and demonstrate a novel global sampling strategy with distributed filters for generating ultra-broadband pseudo-random spectral responses. The geometry of all-pass ring filters is tailored to ensure small self- and cross-correlation for effective information acquisition across the whole spectrum

which dramatically reduces the requirement on sampling channels. We employ the power of reconfigurable photonics in spectrum shaping by embedding the engineered distributed filters. Using a moderate mesh of MZIs

we create 256 diverse spectral responses on a single chip and demonstrate a resolution of 20 pm for single spectral lines and 30 pm for dual spectral lines over a broad bandwidth of 115 nm

to the best of our knowledge achieving a new record of bandwidth-to-resolution ratio. Rigorous simulations reveal that this design will readily be able to achieve single-picometer-scale resolution. We further show that the reconfigurable photonics provides an extra degree of programmability

enabling user-defined features on resolution

computation complexity

and relative error. The use of SiN integration platform enables the spectrometer to exhibit excellent thermal stability of ±2.0 ℃

effectively tackling the challenge of temperature variations at picometer-scale resolutions.

关键词

Keywords

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