Single-Pixel Imaging Using Carrier-Depletion Optical Phased Array With Reduced Phase Shift Requirement

Abstract

The optical-phased array (OPA) has gained special interest in recent years as a high-speed and compact imaging device. While large-scale OPAs have been demonstrated in singlepixel imaging, the complexity of the driver circuit is becoming a crucial problem as the number of phase shifters increases. Here, we investigate the phase shift requirement of OPA for single-pixel imaging and demonstrate, for the first time, that full 2 phase shifts are not mandatory to generate a set of illumination patterns with a sufficient degree of randomness required to reconstruct the image. Using a silicon photonic OPA chip with 128 carrierdepletion-based phase shifters, we experimentally confirm this property by successfully retrieving an image under a maximum phase shift of only 1.5 without affecting the quality of the image. Consequently, the input voltage can be reduced significantly. Since the carrier-depletion phase shifters generally require high driving voltages, this finding paves the way to high-speed OPA-based imaging with a minimum device requirement.

Highly directional Si antenna based on dual-layer gratings for optical phased array

“…Benefiting from the rapid development of photonic integrated circuits, OPA is a recent research hotspot in several fields, including light detection and ranging (LiDAR) 1,2 , free-space optical communication 3 , laser imaging 4 and biosensors 5 . However, due to the lack of sufficient vertical asymmetry in the design, most current OPA antennas radiate almost identically in the upward and downward directions, which lead to a set of interference fringes in the elemental factor of the antenna 6 .…”

Two-Dimensional High-Efficiency Transceiver Integrated Optical Phased Array With Dual-Port Antenna

“…Therefore, the silicon-based optical phased array (OPA) offers a solution to this problem. Integrated OPA has been extensively studied due to its solid-state beam steering capability [1], [2], which has promising applications in laser detection and ranging (LiDAR) [3], free-space optical communications [4], and laser displays [5]. OPAs can accurately steer the beam by precisely controlling the phase of each array element.…”