A5101452260- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Advanced Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Photonic Crystal and Fiber Optics
- Optical Wireless Communication Technologies
- Concrete and Cement Materials Research
- Recycled Aggregate Concrete Performance
- Indoor and Outdoor Localization Technologies
- Structural Health Monitoring Techniques
- Radio Wave Propagation Studies
- Innovations in Concrete and Construction Materials
- Data Management and Algorithms
- Magneto-Optical Properties and Applications
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Optical measurement and interference techniques
- Innovative concrete reinforcement materials
- Geographic Information Systems Studies
- Blind Source Separation Techniques
- Advanced Wireless Communication Techniques
- Interconnection Networks and Systems
Agency for Science, Technology and Research
2011-2025
Institute for Infocomm Research
2011-2025
North China University of Water Resources and Electric Power
2022-2023
Southwest Jiaotong University
2020-2022
Nanyang Technological University
2005-2011
Nankai University
2001-2004
Long-gauge fiber optic sensors have proven to be valuable tools for structural health monitoring, especially in reinforced concrete (RC) beam structures. While their application this area has been well-documented, use RC columns remains relatively unexplored. This suggests a promising avenue further research and development. paper presents thorough comparison of long-gauge traditional measurement when used monitor under small eccentric compressive loading. The evaluation focuses on the...
We propose a new WDM-PON architecture using Fabry-Pérot laser diodes (FP-LDs) that are injection-locked by continuous wave (CW) seed light. The modulation characteristics of the CW light FP-LD first investigated. Both uplink and downlink transmissions at 10 Gb/s experimentally demonstrated proposed FP-LDs. It is shown up to 16 cavity modes can be selectively with side mode suppression ratio larger than 30dB. effects location modes, transmission distance, injection wavelength detuning on...
Compared with backup sharing in WDM networks, it is more complex and challenging to share resources OFDM-based optical networks elastic bandwidth allocation. We propose evaluate conservative agressive policies.
Photonic chip integration would greatly benefit quantum key distribution (QKD) systems for secure communication, in terms of compactness, scalability, and well-established fabrication techniques. This study demonstrates proof concept an all-chip measurement-device-independent QKD system using integrated silicon photonic technology. The prototype generates a rate per pulse $2.923\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ over distance corresponding to 50 km standard fiber with...
In this study, high concentration wastewater from ready-mixed concrete plants was used to replace potable water as mixing of concrete, with replacement rates 0%, 25%, 50%, 75%, and 100%, by weight. The solid content the 12%. Five groups C20 mix proportions were designed. Different properties, including workability, compressive strength durability under freeze–thaw cycles, carbonization, drying conditions, studied, effect increase in proportion a for investigated. microstructural attributes...
We propose two novel wavelength-division-multiplexed passive-optical-network (WDM-PON) architectures where subcarriers are employed to transmit downstream data and optical carriers reused for upstream transmission. Architecture I is designed the situation short distribution fibers available between remote node (RN) each network unit (ONU), whereas II devised case there only one fiber RN ONU. Both use interferometric filter located at simultaneously separate all downlink subcarriers, leading...
A novel broadcast/multicast-capable carrier-reuse WDM-PON architecture is proposed. Utilizing the splitting capability of a power splitter and cyclic property an arrayed waveguide grating (AWG) at remote node, broadcast channel dedicated downlink unicast can be overlaid subsequently transmitted to each optical network unit (ONU) simultaneously. Since ONU receive common with electronically coded information, multicast function implemented in higher layer, similar current multicast-capable...
In this paper, we propose and demonstrate the practical all-optical wavelength multicasting scheme based on four-wave mixing (FWM) effect in both a highly nonlinear fiber (HNLF) semiconductor optical amplifier (SOA). Then carry out comprehensive comparisons of performance differences between using HNLF SOA for proposed scheme. Seven multicast channels are experimentally demonstrated by three co-polarized probes modulated signal. The merit is that polarization sensitivity significantly...
We study the channel equalizer (CE) based on independent component analysis (ICA) for optical orthogonal-frequency-division-multiplexing (OFDM) systems without using training symbols (TSs). begin by studying mathematical ICA models of OFDM and considering both direct-detection (DDO-OFDM) polarization division multiplexing coherent-detection (PDM-CO-OFDM) systems. One purpose this paper is to provide a comprehensive ICA-based CE in DDO-OFDM CO-OFDM Next, we propose matrix initialization...
We report a novel architecture that can be used to construct optical switch fabrics with very high port count and nanoseconds switching speed. It is well known fast time are challenging realize. Currently, one of the most promising solutions based on combination wavelength-tunable lasers arrayed waveguide grating router (AWGR). To scale up number ports in such switches, direct method use AWGRs channel count. However, introduce large crosstalk noise due close wavelength spacing. In this...
A novel cladding-mode-resonance-based polarization-maintaining photonic-crystal-fiber Sagnac interferometer (PMPCF-SI) and its application for fiber sensor are demonstrated. By introducing a mode field diameter mismatch at splicing joint of an inbuilt single-mode (SMF)-PMPCF-SMF structure connected in SI, intermodal interference is constructed by the excited cladding modes polarization PMPCF. With such PMPCF-SI, simultaneous strain temperature measurements The SI behaves as filter...
We experimentally demonstrate the feasibility and dynamic switching performance of a 448 × AWGR-based OXC with nanoseconds speed. To our knowledge, such port-count is unprecedented for switches.
We experimentally study the impact of filter bandwidth a spectrum-sliced amplified spontaneous emission (ASE) source on injection-locking Fabry-Perot laser diode (FPLD) for passive optical network application. Optimal ASE was found in terms receiver sensitivity after transmission. also investigate intensity noise (IN) and its suppression wavelength-locked FPLD using semiconductor amplifier. Experiment results show that output performance is improved by IN
We propose a novel optical carrier-reuse scheme for the wavelength-division-multiplexed passive network. The is based on single delay interferometer (DI) at remote node and reflective semiconductor amplifiers (RSOAs) network units as colorless devices upstream transmission. downstream subcarrier signals are optically separated by DI baseband detection of data carriers used seeding RSOAs. Eight-channel transmission demonstrated 1.25 Gb/s using proposed scheme. impact carrier-to-subcarrier...
We propose and experimentally demonstrate light beam coupling between a single-mode fiber (SMF) highly nonlinear photonic crystal (HN-PCF) based on the fused biconical tapering (FBT) technique. In our experiment, standard SMF is pre-tapered to match its propagation constant that of HN-PCF. order remove condensation in air holes, temperature increased gradually preheat fibers. An appropriate level hydrogen flow administered avoid air-hole collapse. As result, ratio exceeding 90% HN-PCF...
An all-optical wavelength multicasting scheme using four-wave mixing (FWM) in a highly nonlinear fiber (HNLF) Sagnac loop mirror has been demonstrated. This proposed the advantage that even when of multicast channel overlaps with pump-pump generated idler, clear eye diagram can still be observed. Six and ten 10-Gb/s channels, compliant ITU grid, are successfully obtained by two- three-pump lasers, respectively. Multicasting on-off shift keying (OOK) differential phase-shift (DPSK) signals...
We mathematically analyze and experimentally investigate the characteristics of subcarrier-modulated (SCM) light. Our investigation shows that baseband data are also carried on optical carrier after subcarrier modulation. This residual introduce crosstalk when is separated from subcarriers reused for uplink The influence studied in three kinds upstream transmissions based wavelength-seeded reflective semiconductor amplifiers (RSOAs) carrier-reuse wavelength-division-multiplexed-passive...
We propose a novel hybrid WDM/TDM-PON with dynamic Virtual PON (VPON) capability. ONUs in the network can dynamically form virtual TDM-PON to increase bandwidth and optimize resource. The VPON is achieved without using additional lasers tunable lasers. Experiment of 10-Gb/s downstream 1.25-Gb/s upstream transmissions verifies proposed scheme.
The unified management and planning of national or provincial natural resources distributed both aboveground underground have become increasingly important. Accurate depictions resource elements their interactions are key to achieving integrated systematic resources. However, current spatiotemporal data models based only on descriptions, attribute records, other model knowledge a more general basis, without intuitively describing relationships between these This paper, therefore, proposes an...
We demonstrate, for the first time, an injection-locked Fabry Perot laser operating at 20-Gb/s. This can be deployed in wavelength-division-multiplexing OFDM-PONs. Intensity modulation and direct detection are used 0.5-dB SNR penalty is observed after 52-km fiber.