Prof. Changyuan YU
Hong Kong Polytechnic University, Hong Kong, China
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Academic Career Length
28Years (1999-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications13 March 2015 in Light: Science & Applications
Journal Article
TLTing Lei
Ting LeiMZMeng Zhang
Meng Zhang
YLYuru Li
Yuru Li
PJPing Jia
Ping Jia
GLGordon Ning Liu
Gordon Ning Liu
XYXiaocong Yuan
Xiaocong Yuan +6
Data transmission rates in optical communication systems are approaching the limits of conventional multiplexing methods. Orbital angular momentum (OAM) in optical vortex beams offers a new degree of freedom and the potential to increase the capacity of free-space optical communication systems, with OAM beams acting as information carriers for OAM division multiplexing (OAM-DM). We demonstrate independent collinear OAM channel generation, transmission and simultaneous detection using Dammann optical vortex gratings (DOVGs). We achieve 80/160 Tbit s−1 capacity with uniform power distributions along all channels, with 1600 individually modulated quadrature phase-shift keying (QPSK)/16-QAM data channels multiplexed by 10 OAM states, 80 wavelengths and two polarizations. DOVG-enabled OAM multiplexing technology removes the bottleneck of massive OAM state parallel detection and offers an opportunity to raise optical communication systems capacity to Pbit s−1 level.
15 January 2018 in Journal of Lightwave Technology
Journal Article
KANGPING ZHONGXZXian Zhou
Xian ZhouJHJiahao Huo
Jiahao Huo
Changyuan YUCLChao Lu
Chao Lu
Alan Pak Tao LauDriven primarily by cloud service and data-center applications, short-reach optical communication has become a key market segment and growing research area in recent years. Short-reach systems are characterized by direct detection-based receiver configurations and other low-cost and small form factor components that induce transmission impairments unforeseen in their coherent counterparts. Innovative signaling and digital signal processing (DSP) play a pivotal role in enabling these components to realize their ultimate potentials and meet data rate requirements in cost-effective manners. This paper presents an overview of recent DSP developments for short-reach communications systems and discusses future trends.
17 July 2017 in Optics Express
Journal Article
FKFaisal Nadeem Khan
Faisal Nadeem KhanKANGPING ZHONGXZXian Zhou
Xian Zhou
WAWaled Hussein Al-Arashi
Waled Hussein Al-ArashiChangyuan YUAlan Pak Tao Lau +1
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) in digital coherent receivers. The proposed technique automatically extracts OSNR and modulation format dependent features of AHs, obtained after constant modulus algorithm (CMA) equalization, and exploits them for the joint estimation of these parameters. Experimental results for 112 Gbps polarization-multiplexed (PM) quadrature phase-shift keying (QPSK), 112 Gbps PM 16 quadrature amplitude modulation (16-QAM), and 240 Gbps PM 64-QAM signals demonstrate OSNR monitoring with mean estimation errors of 1.2 dB, 0.4 dB, and 1 dB, respectively. Similarly, the results for MFI show 100% identification accuracy for all three modulation formats. The proposed technique applies deep machine learning algorithms inside standard digital coherent receiver and does not require any additional hardware. Therefore, it is attractive for cost-effective multi-parameter estimation in next-generation elastic optical networks (EONs).
29 January 2023 in Laser & Photonics Reviews
Journal Article
YTYuhu Tang
Yuhu Tang
Yao LiangJYJin Yao
Jin Yao
MCMu Ku Chen
Mu Ku ChenSLShirong Lin
Shirong Lin
DTDin Ping Tsai
Din Ping Tsai +4
Bound states in the continuum (BICs) offer novel mechanisms to boost the quality factor (Q‐factor) of resonances. Unfortunately, current studies on chiral BICs metasurfaces suffer from a fundamental trade‐off between Q‐factor and circular dichroism (CD), presenting a significant hurdle that severely limits the independent control between CD and Q‐factors. Here, 3D plasmonic metasurfaces are numerically demonstrated that overcome the trade‐off and offer high‐Q quasi‐BIC resonances (Q ≈ 938) with strong CD (≈0.67) in the mid‐infrared. These metasurfaces are made of integrated‐resonance units consisting of a twisted vertical split‐ring resonator (VSRR) and a wall. Importantly, this dissimilar dimer configuration unlocks a new degree of freedom to decouple the Q‐factor and CD, that is, the Q‐factor and CD can be relatively independently manipulated by the height of the wall and the twisted angle of the VSRR, respectively. These results provide novel paradigms to manipulate advanced chiroptical responses, with various applications that require strong CD with enhanced light–matter interaction.
9 February 2012 in Optics Express
Journal Article
ZWZixiong Wang
Zixiong Wang
Changyuan YUWZWen-De Zhong
Wen-De Zhong
JCJian Chen
Jian Chen
WCWei Chen
Wei Chen
This paper investigates the performance of our recently proposed LED lamp arrangement to reduce the SNR fluctuation from different locations in the room for multi-user visible light communications. The LED lamp arrangement consists of 4 LED lamps positioned in the corners and 12 LED lamps spread evenly on a circle. Our studies show that the SNR fluctuation under such a LED lamp arrangement is reduced from 14.5 dB to 0.9 dB, which guarantees that users can obtain almost identical communication quality, regardless of their locations. After time domain zero-forcing (ZF) equalization, the BER performances and channel capacities of 100-Mbit/s and 200-Mbit/s bipolar on-off-keying (OOK) signal with most significant inter-symbol interference (ISI) are very close to that of the channel without any ISI caused by this LED lamp arrangement.
1 January 2010 in Optical Fiber Technology
Journal Article
About Me
Prof. Changyuan YU received his Ph.D. in Electrical Engineering from the Univ. of Southern California, USA in 2005. He was a visiting researcher at NEC Labs America in Princeton, USA in 2005. He joined the faculty of National Univ. of Singapore (NUS) in 12/2005, where he served as the founding leader of Photonic System Research Group in the Dept. of Electrical and Computer Engineering until 12/2015. He was also a joint senior scientist with A*STAR Institute for Infocomm Research (I2R) in this period. He was a visiting professor with the Univ. of Melbourne, Australia in 2007. In 12/2015, he joined The Hong Kong Polytechnic Univ., where he is now a full professor in Dept. of Electronic and Information Engineering, while he also continues as an adjunct faculty member of NUS. His research focuses on photonic devices, optical fiber communication and sensor systems, and biomedical instruments. He has been the PI/co-PI/co-I of 50+ research projects with 10 million+ US dollars funded, and supervised 10+ postdocs and 20+ PhD students. He has authored/co-authored 6 book chapters and 500+ journal/conference papers (100+ keynote/invited, including OFC in USA). He served in organizing or technical program committees (TPC) for 80+ international conferences and the Telecommunications Standards Advisory Committee for Singapore government. His group won 7 best paper awards in conferences and the national championship in the 3rd China Innovation and Entrepreneurship Competition in 2014.