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Articles by Baile Chen
Minimalist terahertz wireless transceiver in integrated photonics
Abstract Photonics-assisted wireless communication provides a powerful pathway for next-generation infrastructures, offering ultra-wide bandwidth and high spectral agility. Despite extensive research and commercial adoption of photonics-assisted schemes such as radio-over-fiber in base station scenarios, their implementation in space-constrained and power-sensitive end devices remains highly challenging.
Thin film lithium niobate on sapphire for integrated mid-infrared modulator - Nature Communications
Abstract The mid-infrared spectrum, spanning from 3 to 14 µm, holds great promise for molecular spectroscopy and free space optical communication, benefiting from strong molecular absorption and reduced atmospheric attenuation. While progress in MIR photonics has accelerated due to improved sources and detectors, integrated low-loss, high -performance modulators remain limited.
Integrated photonics enabling ultra-wideband fibre–wireless communication - Nature
Abstract Telecommunication systems are evolving towards ultrawide bandwidth and low latency, supporting wired and wireless links and their non-blocking interconnection1. However, a long-standing bandwidth mismatch between fibre communication and its wireless counterpart arises from fundamental disparities in signal architectures and hardware constraints2,3, which prevent high-speed and compatible transmission across the two domains.
InAlAs digital alloy avalanche photodiode with partially depleted absorber
Digital alloy (DA) InAlAs has been employed as the multiplication layer in separate absorption, grading, charge, and multiplication (SAGCM) avalanche photodiodes (APDs) to suppress excess noise in our previous work. In this work, a partially depleted absorber (PDA) is introduced to enhance bandwidth, while a back-illumination structure with flip-chip bonding is utilized to improve quantum efficiency and further boost response speed through inductive peaking.
A chip-integrated comb-based microwave oscillator - Light: Science & Applications
Abstract Low-noise microwave oscillators are cornerstones for wireless communication, radar and clocks. The employment and optimization of optical frequency combs have enabled photonic microwave synthesizers with unrivalled noise performance and bandwidth breaking the bottleneck of those electronic counterparts. Emerging interest is to use chip-based Kerr frequency combs, namely microcombs.
Broadband chaos of an interband cascade laser with a 6-GHz bandwidth
Near-infrared semiconductor lasers subject to optical feedback usually produce chaos with a broad bandwidth of a few GHz. However, the reported mid-infrared interband cascade lasers (ICLs) only show chaos with a limited bandwidth below 1 GHz. Here we show that an ICL with optical feedback is able to generate broadband chaos as well. The mid-infrared chaos exhibits a remarkable bandwidth of about 6 GHz, which is comparable to that of the near-infrared counterpart.
Poling-assisted hydrofluoric acid wet etching of thin-film lithium niobate
Thin-film lithium niobate (TFLN) has been extensively investigated for a wide range of applications due to continuous advancements in its fabrication methods. The recent emergence of high-fidelity ferroelectric domain poling of TFLN provides an opportunity for achieving a precise pattern control of ferroelectric domains and a subsequent pattern transfer to the TFLN layer using hydrofluoric acid (HF).
High-speed uni-traveling carrier photodiode for 2  μm wavelength application
S. Xu, W. Wang, Y.-C. Huang, Y. Dong, S. Masudy-Panah, H. Wang, X. Gong, and Y.-C. Yeo, “High-speed photo detection at two-micron-wavelength: technology enablement by GeSn/Ge multiple-quantum-well photodiode on 300 mm Si substrate,” Opt. Express 27, 5798–5813 (2019). [Crossref] Y. Chen and B. Chen, “Design of InP-based high-speed photodiode for 2-μm wavelength application,” IEEE J. Quantum Electron. 55, 1–8 (2019). [Crossref] J. M. Wun, Y. W. Wang, and J. W.
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