A5114377662- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- Cancer-related Molecular Pathways
- Glioma Diagnosis and Treatment
- Advanced Fiber Optic Sensors
- PAPR reduction in OFDM
- PARP inhibition in cancer therapy
- Cancer, Hypoxia, and Metabolism
- Genetics and Neurodevelopmental Disorders
- ATP Synthase and ATPases Research
- Mitochondrial Function and Pathology
- DNA Repair Mechanisms
- Advanced Wireless Communication Techniques
- Blind Source Separation Techniques
- Neural Networks and Reservoir Computing
- Photonic Crystal and Fiber Optics
- RNA modifications and cancer
- Wireless Signal Modulation Classification
- Photorefractive and Nonlinear Optics
- Chromatin Remodeling and Cancer
- Optical Wireless Communication Technologies
Hong Kong Polytechnic University
2016-2025
Shenzhen Polytechnic
2020-2024
AstraZeneca (United Kingdom)
2019-2023
American University of the Middle East
2022
Faculdade Meridional
2013
AstraZeneca (Brazil)
2013
East Cheshire NHS Trust
2013
Fudan University
2013
Stanford University
2006-2008
University of Toronto
2004-2007
Advanced modulation formats combined with digital signal processing and direct detection is a promising way to realize high capacity, low cost power efficient short reach optical transmission system. In this paper, we present detailed investigation on the performance of three advanced for 100 Gb/s They are PAM-4, CAP-16 DMT. The required each format presented. Comprehensive simulations carried out evaluate in terms received power, transmitter bandwidth, relative intensity noise thermal...
We demonstrate mode-division multiplexed WDM transmission over 50-km of few-mode fiber using the fiber's LP 01 and two degenerate 11 modes.A EDFA is used to boost power output signal before a coherent receiver.A 6×6 time-domain MIMO equalizer recover transmitted data.We also experimentally characterize EDFA.
Machine learning (ML) has disrupted a wide range of science and engineering disciplines in recent years. ML applications optical communications networking are also gaining more attention, particularly the areas nonlinear transmission systems, performance monitoring, cross-layer network optimizations for software-defined networks. However, extent to which techniques can benefit is not clear this partly due an insufficient understanding nature concepts. This paper aims describe mathematical...
We experimentally demonstrate the use of deep neural networks (DNNs) in combination with signals' amplitude histograms (AHs) for simultaneous optical signal-to-noise ratio (OSNR) monitoring and modulation format identification (MFI) digital coherent receivers. The proposed technique automatically extracts OSNR dependent features AHs, obtained after constant modulus algorithm (CMA) equalization, exploits them joint estimation these parameters. Experimental results 112 Gbps...
Abstract A physics‐informed neural network (PINN) that combines deep learning with physics is studied to solve the nonlinear Schrödinger equation for dynamics in fiber optics. systematic investigation and comprehensive verification on PINN multiple physical effects optical fibers carried out, including dispersion, self‐phase modulation, higher‐order effects. Moreover, both special case (soliton propagation) general (multipulse are investigated realized PINN. In existing studies, mainly...
Thin-film lithium niobate (TFLN) based traveling-wave modulators maintain simultaneously excellent performances, including large modulation bandwidth, high extinction ratio, low optical loss, and efficiency. Nevertheless, there still exists a balance between the driving voltage bandwidth. Here, we demonstrate an ultra-large bandwidth electro-optic modulator without compromising on TFLN platform silicon substrate, using periodic capacitively loaded electrode. In order to compensate slow-wave...
We propose a novel technique for modulation format identification (MFI) in digital coherent receivers by applying deep neural network (DNN) based pattern recognition on signals' amplitude histograms obtained after constant modulus algorithm (CMA) equalization. Experimental results three commonly-used formats demonstrate MFI with an accuracy of 100% over wide optical signal-to-noise ratio (OSNR) range. The effects fiber nonlinearity the performance are also investigated. proposed is...
We propose a simple and cost-effective technique for modulation format identification (MFI) in next-generation heterogeneous fiber-optic networks using an artificial neural network (ANN) trained with the features extracted from asynchronous amplitude histograms (AAHs).Results of numerical simulations conducted six different widely-used formats at various data rates demonstrate that proposed can effectively classify all these overall estimation accuracy 99.6% also presence link...
Abstract In long-haul optical communication systems, compensating nonlinear effects through digital signal processing (DSP) is difficult due to intractable interactions between Kerr nonlinearity, chromatic dispersion (CD) and amplified spontaneous emission (ASE) noise from inline amplifiers. Optimizing the standard back propagation (DBP) as a deep neural network (DNN) with interleaving linear operations for fiber nonlinearity compensation was shown improve transmission performance in...
We experimentally demonstrate the successful modulation and error-free detection of three eigenvalue nonlinear frequency division multiplexed (NFDM) signals over 1800 km based on recently developed Fourier transform theoretical framework with digital coherent receivers. The eigenvalues are located upper-half complex plane modulated by independent ON-OFF keying signals, thus forming 3-bit NFDM symbols for fiber transmissions.
Long-haul optical communications based on nonlinear Fourier Transform have gained attention recently as a new communication strategy that inherently embrace the nature of fiber. For using discrete eigenvalues λ ∈ C <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> , information are encoded and decoded in spectral amplitudes q(λ) = b(λ)/(da(λ)/dλ) at root <sub xmlns:xlink="http://www.w3.org/1999/xlink">rt</sub> where a(λ ) 0. In this paper,...
We experimentally demonstrated 140-Gb/s transmission over 20-km standard single-mode fiber employing pulse-amplitude modulation (PAM)-4 and direct detection (DD) at 1.3 μm. DD faster than Nyquist is employed to compensate for channel impairments. The optimal length of taps decision directed least mean square the tap coefficient digital postfilter are investigated. A receiver sensitivity -5.5 dBm bit error rate 3.8× 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We propose a novel technique for simultaneous multi-impairment monitoring and autonomous bit-rate modulation format identification (BR-MFI) in next-generation heterogeneous fiber-optic communication networks by using principal component analysis-based pattern recognition on asynchronous delay-tap plots. The results of numerical simulations performed three commonly used formats at two different bit-rates each demonstrate independent optical signal-to-noise ratio, chromatic dispersion,...
Linear and nonlinear impairments severely limit the transmission performance of high-speed visible light communication systems. Neural network-based equalizers have been applied to optical systems, which enables significantly improved system performance, such as data rate distance. In this paper, a memory-controlled deep long short-term memory (LSTM) neural network post-equalizer is proposed mitigate both linear in pulse amplitude modulation (PAM) based (VLC) Both 1.15-Gbps PAM4 0.9Gbps PAM8...
We propose and demonstrate a high-efficiency silicon microring modulator for next-generation optical transmitters operating at line rates above 300 Gb/s. The supports high-order PAM-8 modulation up to 110 Gbaud (330 Gb/s), with driving voltage of 1.8 Vpp. small device capacitance yields dynamic energy consumption 3.1 fJ/bit. Using the modulator, we compare ultrahigh baud rate PAM-4 130 (260 Gb/s) show is better suited 300-Gb/s lane operation in bandwidth-constrained short-reach systems.
In optical fiber transmission systems using inline amplifiers, the interaction of a signal and amplifier noise through Kerr effect leads to nonlinear phase that can impair detection phase-modulated signals. We present analytical expressions for maximum-likelihood (ML) decision boundaries symbol-error rate (SER) phase-shift keying differential with coherent differentially detection, respectively. The ML are in form thetas(r) = c <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We demonstrate mode division multiplexed WDM transmission using the LP01 and LP11 modes of a few fiber. The signal is recovered 6×6 MIMO equalizer at receiver after amplification by EDFA.
OSNR monitoring is indispensable for coherent systems to ensure robust, reliable network operation and potentially enable impairment-aware routing future dynamic optical networks. In a long-haul transmission link with chromatic dispersion (CD) fiber nonlinearity, it difficult distinguish between amplifier noise nonlinearity induced distortions from received signal distributions even after various impairment compensation techniques, thus resulting in grossly inaccurate estimates. Based on the...
Carrier-less amplitude and phase (CAP) modulation can be a good candidate for short range optical communications considerable computational complexity reduction simple system structure.In this paper, detailed investigation on the digital filters in CAP is presented.An adaptive equalizer based cascaded multimodulus algorithm (CMMA) used demodulation at receiver.The impact of filter taps performance investigated through comprehensive simulations 10 Gb/s CAP16 demonstrated experimentally.The...
In this paper, we experimentally investigate high-order modulation over a single discrete eigenvalue under the nonlinear Fourier transform (NFT) framework and exploit all degrees of freedom for encoding information. For fixed eigenvalue, compare different 4 bit/symbol formats on spectral amplitude show that 2-ring 16-APSK constellation achieves optimal performance. We then study joint phase, magnitude found while real part induces pulse timing drift leads to neighboring interactions...
The use of advanced modulation formats helps to reduce the number components required for short reach optical communication modules at 100 Gb/s and beyond. Unlike long haul systems where externally modulated high order with coherent detection receivers are used, direct lasers likely be employed system implementation. Here we discuss performance pulse amplitude modulation, carrierless amplitude/phase orthogonal frequency- division multiplexing systems. Their possible future high-capacity is explored.
In this paper, a simple novel digital modulation format identification (MFI) scheme for coherent optical systems is proposed. The based on the evaluation of peak-to-average-power ratio (PAPR) incoming data samples after analog-to-digital conversion (ADC), chromatic dispersion (CD) and polarization mode demultiplexing (PMD) compensation at receiver (Rx). Since particular optical-signal-to-noise (OSNR) value different formats have distinct PAPR values, it possible to identify them. proposed...