A Photonic Integrated Circuit based Compressive Sensing Radio Frequency Receiver Using Waveguide Speckle

TL;DR

This paper demonstrates a photonic integrated circuit that performs compressive sensing for RF signals in the 2.5 to 4.5 GHz range, enabling miniaturized and efficient RF signal acquisition.

Contribution

It introduces a novel PIC design utilizing multimode speckle waveguides for optical random projections in compressive sensing RF reception.

Findings

Successfully recovered RF signals between 2.5 and 4.5 GHz

Demonstrated phase and amplitude recovery of RF signals

Passive PIC serves as a step towards miniaturized RF receivers

Abstract

A photonic integrated circuit (PIC) comprised of an 11 cm multimode speckle waveguide, a 1x32 splitter, and a linear grating coupler array is fabricated and utilized to receive 2 GHz of radio-frequency (RF) signal bandwidth from 2.5 to 4.5 GHz using compressive sensing (CS). Incoming RF signals are modulated onto chirped optical pulses which are input to the multimode waveguide. The multimode waveguide produces the random projections needed for CS via optical speckle. The time-varying phase and amplitude of two test RF signals between 2.5 and 4.5 GHz are successfully recovered using the standard penalized $l_1$-norm method. The use of a passive PIC serves as an initial step towards the miniaturization of a compressive sensing RF receiver.