A5081838912- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- Photonic Crystal and Fiber Optics
- PAPR reduction in OFDM
- Interconnection Networks and Systems
- Cloud Computing and Resource Management
- Advanced Wireless Communication Techniques
- Software-Defined Networks and 5G
- Advanced Fiber Optic Sensors
- Nonlinear Photonic Systems
- Semiconductor materials and devices
- Laser-Matter Interactions and Applications
- Error Correcting Code Techniques
- Advanced Data Storage Technologies
- Quantum Computing Algorithms and Architecture
- Blind Source Separation Techniques
- Optical Wireless Communication Technologies
- Quantum Mechanics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advancements in Semiconductor Devices and Circuit Design
- Magneto-Optical Properties and Applications
Alibaba Group (United States)
2015-2024
Alibaba Group (China)
2020-2023
Hong Kong Polytechnic University
2021
Nokia (United States)
2004-2015
Alcatel Lucent (Germany)
2002-2009
National Experimental University of the Armed Forces
2005
Chalmers University of Technology
2000-2002
Beijing University of Posts and Telecommunications
1998-2002
National Taiwan University
2002
Xi'an Peihua University
1998
We quantify the benefits of using different techniques for compensation polarization mode dispersion (PMD) in fiber-optic communication systems by means numerical simulations. This is done both with respect to PMD-induced pulse broadening and terms system outage probability data formats [nonreturn-to-zero (NRZ) return-to-zero (RZ)]. Attention focused on simple relevant single- double-stage post-transmission compensators a few degrees freedom (DOF). It generally believed that PMD compensator...
We present a monolithic dual-polarization quadrature phase-shift keying (QPSK) modulator based on silicon photonic integrated circuit (PIC). This PIC consists of four high-speed modulators, polarization rotator, and beam combiner. A 112-Gb/s polarization-division-multiplexed (PDM) QPSK modulation is successfully demonstrated.
We transmit 32 WDM channels over 12 spatial and polarization modes of 177 km few-mode fiber at a record spectral efficiency bit/s/Hz. The transmitted signals are strongly coupled recovered using 12×12 multiple-input multiple-output digital signal processing.
We report the first successful demonstration of quadrature phase-shift keying (QPSK) modulation using two nested silicon Mach-Zehnder modulators. 50-Gb/s QPSK signal is generated with only 2.7-dB optical signal-to-noise ratio penalties from theoretical limit at a bit-error 10(-3). This result validates that photonics could be viable and powerful platform photonic integrated circuits in coherent communications.
We demonstrate a single-ended colorless coherent receiver using symmetric 3x3 couplers for optical hybrids. show that the can achieve reception of fifty-five 112-Gb/s polarization-division-multiplexed quadrature-phase-shift-keyed (PDM-QPSK) channels with less than 1-dB penalty in back-to-back operation. The also works well long-haul wavelength-division-multiplexed (WDM) transmission system over 2560-km TrueWave® REACH fiber.
Advanced optical modulation formats are a key technology to increase the capacity of communication networks. Mach-Zehnder modulators typically used generate various formats. Here, we report first experimental demonstration quadrature phase-shift keying (QPSK) using compact microring modulators. Generation 20 Gb/s QPSK signals is demonstrated with 30 μm radius silicon ring drive voltages ~6 V. These may be in miniature transponders for high-capacity data links.
We transmit 32 WDM channels over 12 spatial and polarization modes of 177 km few-mode fiber at a record spectral efficiency bit/s/Hz. The transmitted signals are strongly coupled recovered using 12×12 multiple-input multiple-output digital signal processing.
We demonstrate an up to 115-Gb/s line-rate short-reach system using a single 1550-nm VCSEL with discrete multi-tone modulation and direct detection, which can cover 500-m 4-km standard-single-mode fiber at 95-Gb/s 105-Gb/s bit rates.
We experimentally evaluated the performance of 400G coherent and IMDD transceivers for intra-datacenter interconnects, showed that can achieve a higher power budget with comparable ASIC consumption.
Due to widespread applications and rapid development of cloud computing Internet services, hyperscale data centers have experienced an unprecedented demand for networking. Data center networks are required not only handle fast-growing traffic, which doubles almost every one two years, but also provide high flexibility availability support rapidly changing businesses as well. Therefore, become the main drivers optical interconnect technologies in recent years. In this article, scaling...
We review recent research related to polarization mode dispersion (PMD) in fiber-optic transmission systems operating at 40 Gb/s and above. investigate the benefits of using different passive techniques for mitigating effects PMD, including more advantageous data formats compared conventional nonreturn-to-zero (NRZ) format, soliton transmission, forward error correction (FEC). also compare a number active pre- posttransmission compensators.
Using numerical simulations, we study and compare the performance of 42.8-Gb/s 112-Gb/s intradyne coherent polarization-division- multiplexed quadrature-phase-shift-keying (PDM-QPSK) systems in wavelength-division-multiplexed (WDM) transmission with inline dispersion compensation fiber (DCF) that fully electronic compensation. Two effects are considered studies. One is nonlinearities other local oscillator (LO) phase noise to amplitude conversion induced by Results 1000-km employing standard...
In this paper, we present Alibaba’s practices and views on open disaggregated optical transport networks, with a focus metro data center interconnects (DCIs). We first discuss technology developments that have enabled followed by presentation of our network architecture for DCI networks. then describe an overall the application scenario technology. Details point-to-point need reconfigurable add–drop multiplexers (ROADMs) in networks are discussed. models equipment, including terminal...
Abstract Randomness lays the foundation for information security. Quantum random number generation based on various quantum principles has been proposed to provide true randomness in last two decades. We integrate four different types of generators Alibaba Cloud servers enhance cybersecurity. Post-processing modules are integrated into platform extract numbers. employ improved authentication protocols where original pseudo-random numbers replaced with ones. Users from Cloud, such as Ant...
We demonstrate and analyze data modulation of terahertz (THz) signals in the 1 Mbit/s range. THz pulse trains are phase amplitude encoded with pseudorandom binary data, transmitted over a short distance, detected. Different formats generated. Bit error measurements characterize communication channel. estimate from experimental results maximum rates for an optimized system.
We study with simulations interchannel nonlinear effects on a 42.8-Gb/s coherent polarization-division-multiplexed quadrature-phase-shift-keying (PDM-QPSK) system and without dispersion management. find that cross-phase-modulation induced polarization scattering can severely degrade the performance of dispersion-managed PDM-QPSK system. demonstrate time-interleaved return-to-zero PDM-QPSK, where symbols two polarizations are shifted by half symbol in time, significantly suppress managed...
We show that chromatic dispersion induced local oscillator (LO) phase noise to amplitude conversion significantly degrades the performance of a high-speed coherent system without optical compensation and tightens requirement on LO linewidth.
We propose and demonstrate a blind chromatic dispersion (CD) estimation technique for single-carrier coherent optical communication systems. show that the peak-to-average-power ratio (PAPR) of signal is good indicator amount CD experiences minimum PAPR typically corresponds to zero accumulated CD. By scanning values compensator in receiver monitoring after compensator, can be estimated accurately. experimentally this non-dispersion-managed transmission system with mixed 130-Gb/s...
We transmit 16 WDM channels using 20-Gbd QPSK over 12 spatial and polarization modes of 708-km few-mode fiber at a spectral-efficiency-distance product 11328 km bit/s/Hz.The transmitted signals are recovered off-line ×12 multiple-input multiple-output digital signal processing.
We generate a 400-Gb/s line rate signal using directly modulated 2 × 4 monolithic vertical-cavity-surface-emitting-laser array. The consists of four wavelength-division-multiplexed channels at 100-GHz channel spacing and each carries 100-Gb/s polarization-division-multiplexed four-level pulse-amplitude-modulation signal. Using digital coherent detection, we successfully transmit the over 5 80-km standard-single-mode-fiber spans with erbium-doped fiber amplifiers 20% overhead soft-decision...
We generate a 100-Gb/s polarization-division-multiplexed 4-level pulse-amplitude-modulation signal with two directly modulated 1.5-μm single-mode VCSELs. Coherent detection and digital processing enable the transmission over 400-km standard single-mode-fiber (SSMF) 20% overhead hard-decision forward-error-correction.
We present a monolithic polarization diversity coherent receiver by employing 120-degree optical hybrids on silicon photonic integrated circuit (PIC). This PIC monolithically integrates inverse tapers for fiber coupling, splitters, germanium high-speed photo detectors, and based 3x3 multimode interferometers (MMI). demonstrate that 112-Gb/s polarization-division-multiplexed quadrature phase-shift keyed signals are detected in the wavelength range of 1530-1580 nm with comparable performance...
Integrated semiconductor lasers on silicon are one of the most crucial devices to enable low-cost photonic integrated circuits for high-bandwidth optic communications and interconnects. While optical amplifiers typically realized in III-V waveguide structures, it is beneficial have an integration approach which allows flexible efficient coupling light between gain media waveguides. In this paper, we propose demonstrate a novel fabrication technique associated transition structure realize...
We demonstrate compensation of fiber nonlinearities using optical phase conjugation an 8-channel WDM 32-Gbaud PDM QPSK signal. Conjugating every 600 km in a loop enabled 6000 transmission over TrueWave fiber.
Soft-decision forward error correction (SD-FEC) schemes are typically designed for additive white Gaussian noise (AWGN) channels. In a fiber-optic communication system, may be neither circularly symmetric nor Gaussian, thus violating an important assumption underlying SD-FEC design. This paper quantifies the impact of non-AWGN on performance such optical We use conditionally bivariate model (CBGN) to analyze correlations among signal's two quadrature components, and assess effect CBGN using...