Abstract: An apparatus includes a first light source to produce a first reference light, a first pair of arrayed waveguide gratings (AWGs) to demultiplex a first optical signal and the first reference light, respectively, into multiple first signal beams and multiple first reference beams. A first heterodyne optical detector can mix the multiple first signal beams and the multiple first reference beams to generate first quadrature optical signals. A first pair of photo-detectors can convert the first quadrature optical signals to first in-phase (I) and quadrature (Q) electrical signals. The apparatus is implemented as a photonic integrated circuit (PIC) incorporating the first pair of AWGs, the first heterodyne optical detector and the first pair of photo-detectors.

Abstract: An apparatus includes multiple photonic integrated circuit (PIC) optical spectrometers, and an imaging plane coupled to the PIC optical spectrometers. Each PIC optical spectrometer includes multiple semiconductor chip layers. Each semiconductor chip layer includes multiple arrayed waveguide gratings (AWGs) and a number of on-chip optical detectors.

Abstract: An apparatus includes a number of photonic integrated circuit (PIC) imaging detector arrays, and multiple electronic integrated circuits (ICs) coupled to the PIC imaging detector arrays. Each PIC imaging detector array of includes a number of lenslets and a number of waveguides. At least some of the lenslets are coupled to multiple waveguides, and sets of two lenslets are configured to form interferometer channels.