Ultra-high Resolution On-chip Spectrometer with a Large Working Window

We propose and demonstrate on-chip spectrometer with an ultra-high-resolution of ~30 pm and a large working window of ~30 nm, which is realized by combining an array of 2nd-order adiabatic elliptical-micro-racetracks (AEMs) and a Euler micro-racetrack-resonator (EMRR).