A5100331045- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Microwave Engineering and Waveguides
- Advanced Optical Network Technologies
- Metamaterials and Metasurfaces Applications
- PAPR reduction in OFDM
- Optical Wireless Communication Technologies
- Plasmonic and Surface Plasmon Research
- Advanced Antenna and Metasurface Technologies
- Electromagnetic Compatibility and Noise Suppression
- Advanced SAR Imaging Techniques
- Radar Systems and Signal Processing
- Spectroscopy and Laser Applications
- Power Systems and Renewable Energy
- Laser-Matter Interactions and Applications
- Optical Systems and Laser Technology
- Gyrotron and Vacuum Electronics Research
- Power Systems and Technologies
- Radio Frequency Integrated Circuit Design
- Solid State Laser Technologies
- Acoustic Wave Resonator Technologies
Naval University of Engineering
2013-2024
University of Electronic Science and Technology of China
1991-2024
China University of Geosciences
2022-2024
State Grid Hebei Electric Power Company
2024
State Grid Corporation of China (China)
2019-2024
Xidian University
2024
Hunan Agricultural University
2024
Southwest University of Science and Technology
2005-2023
Changzhou University
2023
Jilin University
2016-2023
Abstract Human exposure to pathogenic viruses in environmental waters results a significant global disease burden. Current microbial water quality monitoring approaches, mainly based on fecal indicator bacteria, insufficiently capture human health impacts posed by water. The emergence of the ‘microbiome era’ and high-throughput metagenome sequencing has led discovery novel human-associated viruses, including both commensal microbiome. is often followed their detection wastewater,...
Clarification of the catalytic mechanism a S and Fe co-regulated Ni metal catalyst for alkaline overall water splitting.
A pruning method of artificial neural network based nonlinear equalizer (ANN-NLE) is proposed and validated for single-sideband 4-ary pulse amplitude modulation (SSB-PAM4) in IM/DD system. As a classifier, ANN capable to form complex boundary among different classifications, which considered as an appropriate way mitigate the impairments optical communication In this paper, first, we introduce operation principle traditional linear (LE) NLE such volterra (VE). Then make analogy LE, VE...
We experimentally demonstrate C-band 2 × 56 Gb/s pulse-amplitude modulation (PAM)-4 signal transmission over 100 km standard single-mode fiber (SSMF) using 18 GHz direct-modulated lasers (DMLs) and direct detection, without inline optical amplifier. A delay interferometer (DI) at the transmitter side is used to extend reach from 40 km. digital Volterra filter receiver mitigate nonlinear distortions. obtain an average bit error ratio (BER) of 1.5 10(-3) for PAM-4 after SSMF optimal input...
This paper proposes a nonlinear equalization technique enabled by long short-term memory (LSTM) recurrent neural networks. The proposed is implemented at the end of offline digital signal processing. And two approaches utilizing LSTM network are experimentally tested and demonstrated in transmission 50-Gb/s four-level pulse amplitude modulation intensity direct detection link over 100-km standard single-mode fiber. first approach uses network-based equalizer to directly categorize received...
An improved high-order delta-sigma modulator with multi-level quantizer is proposed to enable carrier aggregation of 4G-LTE signals in mobile fronthaul. Different from conventional modulation-based digital fronthaul, a 2-bit employed reduce the quantization noise, which enabling transmission via PAM-4 based IM-DD channel. Moreover, we employ 4th-order high-pass filter (HPF) replace 1st-order HPF modulator, resulting much better noise shaping performance. In experiment, fronthaul 32...
We present the design and optimization of optical single side-band (SSB) Nyquist four-level pulse amplitude modulation (PAM-4) transmission using dual-drive Mach-Zehnder modulator (DDMZM)modulation direct detection (DD), aiming at C-band cost-effective, high-speed long-distance transmission. At transmitter, laser line width should be small to avoid phase noise conversion equalization-enhanced due large chromatic dispersion (CD). The SSB signal is generated after optimizing index (OMI) hence...
We designed and demonstrated TE-mode arbitrary power splitters based on adiabatic mode evolution. The are with a footprint of smaller than 12 × 2.9 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , fabricated 400-nm silicon-on-insulator platform, requiring only single etch step. optimization process the conditions for arbitrary-power splitting performed using three-dimensional-FDTD simulations. prove this concept through fabrication...
This Letter reports the first demonstration of a high-speed three-dimensional (3D) schlieren technique based on combination fiber imaging, Toepler's lens-type schlieren, and computed tomography (CT). The uses single camera, two xenon lamps, series bundles to simultaneously capture images turbulent flames from seven orientations with framerate beyond tens kHz. presented method complements existing advantages being flexible, high speed, low cost. 3D is demonstrated validated premixed flame...
The applications of rate-compatible low-density parity-check (RC-LDPC) codes are investigated for a 16 quadrature amplitude modulation (16QAM) signal and coherent detection system. With signals, we can provide the flexible net data rate between 135.5 Gb/s 169.7 in passive optical network (PON) link. Based on LDPC defined IEEE 802.3ca standard, construct two sets RC-LDPC with fixed variable information bit length. Since puncturing operation may degrade performance codes, apply...
We propose a Hilbert superposition and modified signal-to-signal beating interference (SSBI) cancellation scheme in an optical single side-band (SSB) modulation direct-detection system. The SSB signal is generated by relatively low-cost dual-drive Mach-Zehnder modulator (DDMZM). two driving signals are pair of with Nyquist pulse-shaped four-level pulse amplitude (NPAM-4). In addition to the transmitted baseband signal, both its transform SSBI can also be detected direct-detection, which...
We propose a novel radial basis function neural network (RBF-NN)-based nonlinear equalizer (NLE) for the intensity modulation/direct detection (IM/DD) transmission. After optimizing input characteristics of RBF-NN, we experimentally demonstrate C-band 4×50 Gb/s four-level pulse-amplitude modulation (PAM-4) transmission over 80 km standard single-mode fiber (SSMF), using 18 GHz direct-modulated lasers and dispersion compensation fiber. that RBF-NN-based NLE outperforms commonly used Volterra...
To enable the high quality-of-service of reliable and dynamic optical networks, it is essential to implement performance monitoring (OPM) for fiber transmission link. Being directly related quality signal, signal-to-noise ratio (OSNR) chromatic dispersion (CD) have become most vital parameters be monitored during OPM implementation. However, existing simultaneous OSNR CD schemes still suffer from implementation complexity low accuracy. Here, we demonstrate a joint scheme digital coherent...
We investigated and prepared a chirped long-period grating for high sensitivity bending measurement. The novel fiber structure is composed of the multimode (MMF) with fixed length gradually longer single-mode using continuous splicing method. powerful ability refractive index modulation in MMF renders miniaturization sensor. total sensor 3.45 mm. Chirped period arrangement adopted to improve sensitivity. Through numerical calculation, chirp coefficient determined, clear resonance peaks are...
A multimode fiber chirped long-period grating (MC-LPG) is proposed and studied as a sensor for simultaneous measurement of strain temperature. This consists linear fixed-length single-mode fiber. The numerical analyses the transmission spectrum coupling mode are carried out to obtain appropriate period arrangement. experimental results in good agreement with theoretical results. arrangement induces double peaks. Therefore, temperature realized by observing wavelength shift two In addition,...
High-performance germanium photodiodes are crucial components in silicon photonic integrated circuits for large-capacity data communication. However, the bandwidths of most limited by intractable resistance–capacitance parasitic effect. Here, we introduce a unique U-shaped electrode to alleviate this issue, reducing effect 36% without compromising any other performance. Experimentally, large bandwidth 103 GHz, an optical responsivity 0.95 A/W at 1550 nm, and dark current as low 1.3 nA...