Fig. 9. Narrowband-filters based spectrometers on silicon photonics platform.

a Schematic of a cascaded MZI filters based spectrometer⁷³. b Spectrum tailoring of cascaded MZI filters based spectrometers by optimizing the couplers at each MZI⁷⁴. c Schematic of a ring resonators array based spectrometer⁷⁹. d Cascaded Bragg gratings based spectrometer⁸⁰. e Spectrometer composed of both AWG and ring resonators⁸¹. a Reprinted from ref. ⁷³ with permission from IEEE Publishing. b Reprinted from ref. ⁷⁴ with permission from IEEE Publishing. c Reprinted from ref. ⁷⁹ with permission from Optica Publishing Group. d Reprinted from ref. ⁸⁰ with permission from Optica Publishing Group. e Reprinted from ref. ⁸¹ with permission from IEEE Publishing