Algorithm-Enhanced High-Resolution Silicon Photonic Spectrometer With Micro-Ring Resonators

• Published in: Journal of lightwave technology Vol. 42; no. 8; pp. 3016 - 3021
• Main Authors: Ding, Zhihuan, Zhang, Long, Wang, Gaopeng, Hong, Shihan, Dai, Daoxin
• Format: Journal Article
• Language: English
• Published: New York IEEE 15.04.2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithm design and theory; Algorithms; Arrays; Broadband communication; Crosstalk; Filtering algorithms; Filtering theory; High resolution; Optical filters; optical resonators; Performance enhancement; Resonator filters; Resonators; Signal to noise ratio; silicon photonics; Spectrometers; spectroscopy; Spectrum analysis; System-on-chip
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2023.3347252

A high-resolution on-chip optical spectrometer is proposed and demonstrated with the performance enhancement by introducing a spectrum reconstruction algorithm. The present spectrometer consists of a high-Q Euler micro-racetrack resonator with an array of second-order adiabatic elliptical micro-rings, achieving a high resolution of ∼15 pm and a working window of ∼27 nm. With the algorithm, the spectrum analyzing becomes immune to the inter-channel crosstalk of the array of optical filters, and thus the signal-noise ratio is improved by 10 dB in comparison with the conventional spectrum analysis using direct measurement, greatly helping the realization of high-performance on-chip spectrometers in the future.