Integrated scanning spectrometer with a tunable micro-ring resonator and an arrayed waveguide grating

• DOI: 10.1364/prj.443039
• Publication Date: 2022-03-31T18:30:20Z
• Authors: Zunyue Zhang; Yi Wang; Jiarui Wang; Dan Yi; David Weng U Chan; Wu Yuan; Hon Ki Tsang
• Keywords: Free spectral range; Arrayed waveguide grating; Spectral resolution; Waveguide

Integrated spectrometers with both wide optical bandwidths and high spectral resolutions are required in applications such as domain coherence tomography (SD-OCT). Here we propose a compact integrated scanning spectrometer by using tunable micro-ring resonator (MRR) single arrayed waveguide grating for operation the 1265–1335-nm range. The resolution of is determined quality factor MRR, bandwidth defined free range grating. on-chip germanium photodetectors, which enable direct electrical readout. A 70-nm 0.2-nm channel spacing enabled MRR across one demonstrated, offer total 350 wavelength channels 31-kHz speed. applied to measure different spectra interference signals from an SD-OCT system, shows its great potential future sensing imaging systems.