2019/01/14 by Weiqiang Xie, Xie, Weiqiang, Tin Komljenović +7
Engineering · Physics and Astronomy · #Advanced Photonic Communication Systems #Applied Physics (physics.app-ph) #FOS: Physical sciences #Optics (physics.optics) #Photonic and Optical Devices #Semiconductor Quantum Structures and Devices
paper · pdf · doi:10.48550/arxiv.1904.01104
openalex publication_date 2019/01/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
High-performance integrated optical phased arrays (OPAs) are crucial for building up energy-efficient solid-state beam steering systems on a chip. This work demonstrates a first heterogeneous III-V/Si phase-shifter based OPA that utilizes III-V multiple quantum well (MQW) structures to provide superior performance. Demonstrated phase shifters have Vpi of only 0.45 V and residual amplitude modulation (RAM) of only 0.15 dB at 1550 nm for 2pi phase shift with low power consumption of less than 3 nW, which are, to the best our knowledge, the state-of-the-art performance with a record low operating voltage, low power consumption, and low RAM in on-chip OPAs. Their bandwidth is >1 GHz across 200 nm wavelength range. Wavelength tuning is used to demonstrate two-dimensional beam steering with a field of view of 28x51 degree in the 32-channel OPA with an emitter-array pitch of 2 um. Side-mode suppression ratio of 16 dB is also achieved. The high-performance heterogeneous OPA paves the way for scalable and efficient on-chip beam steerers with large steering range and high beam quality.