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- Title
Novel High‐Resolution and Large‐Bandwidth Micro‐Spectrometer Using Multi‐Input Counter‐Propagating Arrayed Waveguide Grating and Dual‐Wavelength Grating Coupler on Silicon on Insulator.
- Authors
Zou, Jun; Li, Lingfeng; Wang, Changhui; Zhuang, Yuan; Wang, Xuyang; Hu, Jinhua; Luo, Shaobo; He, Jian‐Jun
- Abstract
Miniaturized micro‐spectrometers with high‐resolution and large‐bandwidth are of great importance for on‐site spectroscopic analysis applications. Here, a novel high‐resolution and large‐bandwidth micro‐spectrometer is presented, which operates at dual‐wavelength band by utilizing a (N + 3) × (N + 3) arrayed waveguide grating (AWG) and three dual‐wavelength grating couplers on a silicon‐on‐insulator (SOI) platform. The AWG working in a counter‐propagating manner can be viewed as two 3 × N AWGs, and the dual‐wavelength grating coupler acts as a prefilter. Three time‐division‐multiplexing inputs with wavelength spacings of 4/3 times that of N output waveguides are employed to improve the resolution of the micro‐spectrometer. Combining the corresponding outputs of three inputs, a micro‐spectrometer with resolution enhanced to one‐third wavelength spacing of output waveguides and effective channel number enlarged to 3 × (N − 2) is achieved, only using N output channels at each wavelength band. A micro‐spectrometer with 63 effective channels and resolutions of 0.5 and 0.442 nm at 1550 and 1310 nm bands, respectively, is experimentally demonstrated. The footprint of the fabricated micro‐spectrometer is 2 × 0.81 mm2, with measured on‐chip losses of −4.6 to −2.8 dB (−7.0 to −3.1 dB) and crosstalk levels < −18.5 (−16.8) dB at the 1550 (1310) nm band.
- Subjects
SILICON; WAVEGUIDES; WAVELENGTHS; WAVELENGTH division multiplexing; COPLANAR waveguides
- Publication
Laser & Photonics Reviews, 2023, Vol 17, Issue 2, p1
- ISSN
1863-8880
- Publication type
Article
- DOI
10.1002/lpor.202200355