A5001030570- Photonic and Optical Devices
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Semiconductor Quantum Structures and Devices
- Advanced Fiber Optic Sensors
- Photorefractive and Nonlinear Optics
- Optical Coatings and Gratings
- Nanowire Synthesis and Applications
- Neural Networks and Reservoir Computing
- Galaxies: Formation, Evolution, Phenomena
- 2D Materials and Applications
- Mechanical and Optical Resonators
- Plasmonic and Surface Plasmon Research
- Cosmology and Gravitation Theories
- Non-Invasive Vital Sign Monitoring
- Quantum Information and Cryptography
- Advanced optical system design
- Laser-Matter Interactions and Applications
- graph theory and CDMA systems
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Mathematical Theories and Applications
- Solid State Laser Technologies
Hong Kong University of Science and Technology
2023-2025
University of Hong Kong
2023-2025
Microelectronica (Romania)
2025
IMEC
2024
Chinese University of Hong Kong
1997-2023
Prince of Wales Hospital
2022
University of California, Santa Barbara
2020
Eckernforde Tanga University
1982
Quantum networks provide the framework for quantum communication, clock synchronization, distributed computing, and sensing. Implementing large-scale practical relies on development of scalable architecture integrated hardware that can coherently interconnect many remote nodes by sharing multidimensional entanglement through complex-medium channels. We demonstrate a multichip network based mass-manufacturable integrated-nanophotonic node chips fabricated silicon wafer means complementary...
Abstract Photonic bound states in the continuum (BICs) have been exploited various systems and found numerous applications. Here, we investigate high-order BICs apply on an integrated photonic platform to high-dimensional optical communication. A four-channel TM mode (de)multiplexer using different orders of etchless lithium niobate (LiNbO 3 ) where waveguides are constructed by a low-refractive-index material high-refractive-index substrate is demonstrated. Low propagation loss modes...
Mode-division multiplexing (MDM) in optical fibers enables multichannel capabilities for various applications, including data transmission, quantum networks, imaging, and sensing. However, high-dimensional fiber systems, usually necessity bulk-optics approaches launching different orthogonal modes into the fiber, multiple-input multiple-output digital electronic signal processing at receiver to undo arbitrary mode scrambling introduced by coupling transmission a multi-mode fiber. Here we...
A simple technique for measuring optical fibre dispersion (or pulse spectrum if is known) demonstrated. Ultra-short pulses are linearly dispersed in the under test, thus mapping their to time domain. The delay between two spikes pulse's temporal profile, corresponding spectral spikes, accurately gives dispersion.
We propose a novel high-efficiency, low-reflection, and fabrication-tolerant perfectly vertical grating coupler (PVGC) with minimum feature size >200 nm to allow for fabrication using 193 deep-ultraviolet lithography. The structural parameters of PVGC were optimized by genetic optimization algorithm. Simulations predicted the coupling efficiency be −2.0 dB (63.0%) back reflections less than −20 in wavelength range 1532–1576 nm. design was fabricated multi-project wafer run silicon photonics,...
We propose a novel and highly efficient multimode waveguide grating coupler which can simultaneously launch four channels including two polarizations of the linear polarized (LP) modes, LP <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> step-index few-mode fiber (FMF). The on silicon-on-insulator (SOI) platform is based subwavelength structure was optimized using genetic optimization...
Abstract Distributed feedback (DFB) lasers represent a central focus for wavelength‐division‐multiplexing‐based transceivers in metropolitan networks. Here, the first 1.3 µm quantum dot (QD) DFB grown on complementary metal‐oxide‐semiconductor (CMOS)‐compatible (001) Si substrate are reported. Temperature‐stable, single‐longitudinal‐mode operation is achieved with side‐mode suppression ratio of more than 50 dB and threshold current density 440 A cm −2 . single‐lane rate 128 Gbit s −1 net...
Avalanche photodiodes (APDs) on Si operating at optical communication wavelength band are crucial for the Si-based transceiver application. In this paper, we report first O-band InAs quantum dot (QD) waveguide APDs monolithically grown with a low dark current of 0.1 nA unit gain and responsivity 0.234 A/W 1.310 μm (−5 V). linear mode, have maximum 198 show clear eye diagram up to 8 Gbit/s. These QD-based enjoy benefit sharing same epitaxial layers processing flow as QD lasers, which could...
Integrating light emission and detection functionalities using efficient III-V materials on Si wafers is highly desirable for Si-based photonic integrated circuits. To fulfill the need of high-performance photodetectors (PDs) monolithically photonics, we demonstrate PDs directly grown a InP/Si-on-insulator (SOI) platform parallel to device layer in variety dimensions. Device characteristics including 3 dB bandwidth beyond 40 GHz, open eye diagrams at Gb/s, dark current 0.55 nA, responsivity...
Abstract Integration of 2D materials on dielectric planar optical waveguides can make available new functionalities from the materials' enhanced optoelectronic properties, such as nonlinearity, light emission, modulation, photodetection, and saturable absorption. However, conventional integration schemes involving either transfer onto prepatterned nonplanarized topology photonic integrated circuits (PICs) or growth patterning degrade properties material. Here, a fundamentally practical...
Radio-over-fiber (ROF)-based mobile fronthaul network supporting the baseband unit and simple remote radio head is a promising architecture for future wireless networks. In this paper, we propose demonstrate silicon photonics (SiPh)-based frontend (RRF) mm-wave ROF systems. The proposed SiPh-based RRF consisted of an integrated Mach-Zehnder modulator micro-ring modulator, producing single-sideband 40 GHz millimeter-wave orthogonal-frequency-division-multiplexing signal, which robust against...
Hybrid integration of two-dimensional (2D) materials holds great promise for realizing novel optoelectronic components on planar dielectric waveguides. Functional devices based 2D layered transition metal dichalcogenides (TMDs) offer the advantages low dark current and high speed. In this work, we propose experimentally demonstrate a high-speed hybrid integrated PtSe2 silicon nitride waveguide photodetector. The light is guided in channel by structure principle bound states continuum (BICs)....
Silicon photonics has been regarded as a promising technology for future small-footprint, low-cost and low-power 400-Gbit/s datacenter interconnects (DCIs). In this work, the first time, we report an experimental demonstration of single-wavelength, single-polarization 160-Gbit/s four-level pulse-amplitude modulation (PAM-4) employing single integrated silicon carrier-depletion micro-ring modulator (MRM). The measured bit-error rates (BERs) back-to-back (BTB) after 1-km standard single-mode...
Two-dimensional (2D) layered platinum diselenide (PtSe2) offers attractive optoelectronic properties including chemical stability in air, high electron mobility at room temperature, a non-zero thickness-dependent bandgap, and optical absorption that extends from visible to infrared wavelengths. We report the use of PtSe2 for high-speed photodetectors. In this work, we experimentally demonstrated chemical-vapor-deposition-grown thin-film photodetectors can measure picosecond pulses....
Abstract Wavelength tunable lasers are increasingly needed as key components for wavelength resource management technologies in future dense division multiplexing (DWDM) systems. While material systems with multiple quantum wells an active region widely used long‐wavelength lasers, the unique advantages of InAs/GaAs dots (QDs) low‐power operation, excellent thermal stability, and wide spectral bandwidth may open a new avenue this field. Combining QDs special designed half‐wave coupled cavity...
Abstract Space‐division multiplexing (SDM) is one of the key enabling technologies to increase capacity fiber communication systems. However, implementing SDM‐based systems using multimode has been challenging with need for compact, low‐cost, and scalable mode de/multiplexer (DE/MUX). Here a novel integrated MUX few‐mode fibers (FMFs) presented which can launch up eight spatial polarization channels. The new design composed 2D grating coupler (MMGC), highly compact spot size converters...
For next generation highly integrated transceivers, silicon photonics (SiP) has attracted widespread interest in using mature CMOS production processes to manufacture high-yield, low-cost photonic circuits (PIC) with the potential for integration electronics. SiP now routinely integrate GeSi electroabsorption modulators (EAM) and waveguide photodiodes which have high responsivity possess 3-dB electro-optic bandwidth of over 65 GHz. Their ultra-compact dimensions make it possible...
While large language models (LLMs) have shown remarkable potential in automating various tasks digital chip design, the field of Photonic Integrated Circuits (PICs)-a promising solution to advanced designs-remains relatively unexplored this context. The design PICs is time-consuming and prone errors due extensive repetitive nature code involved photonic design. In paper, we introduce PICBench, first benchmarking evaluation framework specifically designed automate PIC generation using LLMs,...
Blood pressure (BP), a crucial health biomarker, is essential for detecting early indications of cardiovascular disease in routine monitoring and clinical surveillance inpatients. However, conventional cuff-based BP measurements are limited providing continuous comfort monitoring. Here, we present an optical pulse sensing patch monitoring, which integrates three units Gallium Nitride (GaN) optopairs with micronanostructured polydimethylsiloxane films to capture waves. Multipoint signals...