Mr Wang is doing PhD in Electronics Engingeering in University of Kent, Canterbury, UK, and he had M.Eng in Electronics and Communications, in Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China and B.Sc in Applied Physics in Hefei University of Technology, Hefei, China. And before that it's Adam and Eve.
Mr Wang is a student member of IEEE, OSA, SPIE. He had authored more than 15 peer-reviewed journal publications and international conference papers and he is a regular reviewer for different journals, such as Optics Letters, Optics Express, Journal of Lightwave Technology, Photonics Technolgy Letters, Chinese Optics Letters, Optics Communications etc.
Mr Wang's research interests are interdisciplinary areas that focus on optics and photonics with different applications, such as in biomdical and biophotonics, optical communication, optical signal processing, and optical sensing applications. His research interests are in three categories:
1) biophotonics: ultrafast high-throughput optical imaging for biomedical applicaitons.
2) Ultrafast Optics: ultrafast optical pulses shaping and ultrafast optical signal processing.
3) Fiber Optics: fiber Bragg gratings, fiber-optic sensors and sensing signal modulation and demodulation.
His research projects are:
EU Marie-Curie Intergration Grant-- "Ultrafast Spectroscopy and Microscopy for High-Throughput Biomedical Applications" (Link: https://www.eda.kent.ac.uk/research/theme_project.aspx?pid=199).
“Beam Steering NIR Indoor Optical Wireless Communications” (Link: https://www.eda.kent.ac.uk/research/theme_project.aspx?pid=263),
“Ultrafast optical compressed sensing imaging based on multimode interference”,
“Spatial light modulator (SLM) for ultrafast compressed sensing imaging applications”,
“Compressed sensing optical coherence tomography (OCT)”
He serves as a demonstrator/graduate teaching assistant in various of courses, such as:
EL033 Introduction to programming using MATLAB
EL305 Introduction to Electronics
EL311 The Robotics Project
EL313 Introduction to Programming
EL315 Digital Technologies
EL318 Engineering Mathematics
EL319 Engineering Analysis
EL560 Microcomputer Engineering
EL562 Computer Interfacing
EL574 Designing Media Environments
EL676 Digital Signal Processing and Control
EL844 Image Analysis with Security Applications
Wang, G. et al. (2018). Improved resolution optical time stretch imaging based on high efficiency in-fiber diffraction. Scientific Reports [Online] 8:600. Available at: https://www.nature.com/articles/s41598-017-18920-8.Most overlooked challenges in ultrafast optical time stretch imaging (OTSI) are sacrificed spatial resolution and higher optical loss. These challenges are originated from optical diffraction devices used in OTSI, which encode image into spectra of ultrashort optical pulses. Conventional free-space diﬀraction gratings, as widely used in existing OTSI systems, suffer from several inherent drawbacks: limited diffraction efficiency in a non-Littrow configuration due to inherent zeroth-order reflection, high coupling loss between free-space gratings and optical fibers, bulky footprint, and more importantly, sacrificed imaging resolution due to non-full-aperture illumination for individual wavelengths. Here we report resolution-improved and diffraction-efficient OTSI using in-fiber diffraction for the first time to our knowledge. The key to overcome the existing challenges is a 45° tilted fiber grating (TFG), which serves as a compact in-fiber diffraction device offering improved diffraction efficiency (up to 97%), inherent compatibility with optical fibers, and improved imaging resolution owning to almost full-aperture illumination for all illumination wavelengths. 50 million frames per second imaging of fast moving object at 46 m/s with improved imaging resolution has been demonstrated. This conceptually new in-fiber diffraction design opens the way towards cost-effective, compact and high-resolution OTSI systems for image-based high-throughput detection and measurement.
Wang, G. et al. (2018). Highly efficient optical beam steering using an in-fiber diffraction grating for full duplex indoor optical wireless communication. Journal of Lightwave Technology [Online] 36:4618-4625. Available at: https://doi.org/10.1109/JLT.2018.2832200.Diffraction gratings have been widely used in wavelength-controlled non-mechanical laser beam steering for high data-rate indoor optical wireless communications (OWC). Existing free-space diffraction gratings suffer from inherent difficulties of limited diffraction efficiency, bulky configuration, high cost and significant coupling loss with optical fiber links. In this work, a new optical approach for highly efficient, compact and fiber compatible laser beam steering using an in-fiber diffraction grating is proposed and experimentally demonstrated for the first time to our best knowledge. In-fiber diffraction is made possible based on a 45° tilted fiber grating (TFG), where wavelength dependent lateral scattering is obtained due to the strongly tilted grating structure. Improved diffraction efficiency of 93.5% has been achieved. In addition, the 45° TFG works perfectly for both light emission and reception, enabling full-duplex optical wireless transmission. Utility of the 45° TFG in all-fiber laser beam steering for multi-user full duplex optical wireless communications has been verified in experiments. 1.4 m free-space full-duplex wireless transmission has been demonstrated with data rate up to 12 Gb/s per beam using 2.4 GHz bandwidth OFDM signals.
Mididoddi, C. et al. (2017). High throughput photonic time stretch optical coherence tomography with data compression. IEEE Photonics Journal [Online]. Available at: https://doi.org/10.1109/JPHOT.2017.2716179.Photonic time stretch enables real time high throughput optical coherence tomography (OCT), but with massive data volume being a real challenge. In this paper, data compression in high throughput optical time stretch OCT has been explored and experimentally demonstrated. This is made possible by exploiting spectral sparsity of encoded optical pulse spectrum using compressive sensing (CS) approach. Both randomization and integration have been implemented in the optical domain avoiding an electronic bottleneck. A data compression ratio of 66% has been achieved in high throughput OCT measurements with 1.51 MHz axial scan rate using greatly reduced data sampling rate of 50 MS/s. Potential to improve compression ratio has been exploited. In addition, using a dual pulse integration method, capability of improving frequency measurement resolution in the proposed system has been demonstrated. A number of optimization algorithms for the reconstruction of the frequency-domain OCT signals have been compared in terms of reconstruction accuracy and efficiency. Our results show that the L1 Magic implementation of the primal-dual interior point method offers the best compromise between accuracy and reconstruction time of the time-stretch OCT signal tested.
Conference or workshop item
Mididoddi, C. et al. (2018). Ultrafast User Localization and Beam Steering in Optical Wireless Communication Using an In-Fibre Diffraction Grating. in: 2018 International Topical Meeting on Microwave Photonics (MWP). IEEE. Available at: https://doi.org/10.1109/MWP.2018.8552858.Wavelength-controlled laser beam steering has been successfully demonstrated for indoor optical wireless communications (OWC). Here we demonstrate ultrafast user localization (50 million scans per second) in OWC based on real-time wavelength monitoring. A separate time stretched pulsed laser source is introduced to implement ultrafast optical wavelength (hence optical beam) scanning. A dispersion unbalanced Mach-Zehnder interferometric configuration creates chirped encoding in stretch optical pulses. The reflected optical wavelength from a remote user carrying the location information of the user is detected by real-time instantaneous microwave frequency detection. This new approach facilitates simultaneous ultrafast user localization and data transmission at communication C-band. A proof-of-concept experiment is carried out to verify the proposed approach.
Wang, G. et al. (2017). Wavelength-controlled beam steering for optical wireless transmission using an in-fiber diffraction grating. in: 2017 Conference on Lasers and Electro-Optics.. Available at: http://dx.doi.org/10.1364/CLEO_SI.2017.SF1L.5.Passive beam steering for optical wireless transmission based on wavelength tuning using a novel in-fiber diffraction grating featuring compactness, high diffraction efficiency and inherent fiber-compatibility, is proposed and experimentally demonstrated for the first time.
Wang, G. et al. (2017). In-fibre diffraction grating based beam steering for full duplex optical wireless communication. in: International Topical Meeting on Microwave Photonics (MWP), 2017.. Available at: https://doi.org/10.1109/MWP.2017.8168644.A novel approach to achieve wavelength controlled optical beam steering using a 45° tilted fiber grating (TFG) for full-duplex indoor optical wireless transmission is proposed and experimentally demonstrated for the first time. The 45° TFG functions as an in-fiber passive diffraction device for wavelength steered light emission and reception, which enables full-duplex optical wireless transmission. The unique advantages of using an in-fiber TFG device for beam steering include high diffraction efficiency, low cost, compactness and inherent compatibility with existing fiber links. In a proof-of-concept experiment, free-space full-duplex transmission over 1.4 m with data rate of 9.6 Gb/s per beam has been demonstrated using 2.4 GHz bandwidth signals.
Qin, H. et al. (2017). Theoretical analysis of diffraction grating based on 45°-tilted fiber gratings. in: 2017 Opto-Electronics and Communications Conference (OECC).. Available at: https://doi.org/10.1109/OECC.2017.8114931.
Mididoddi, C. et al. (2017). Photonic time-stretch optical coherence tomography with data compression and improved resolution. in: 2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). IEEE. Available at: http://dx.doi.org/10.1109/CLEOPR.2017.8118840.In this paper, we investigate the reconstruction of non-harmonic tones in data-compressed PTS-OCT based on multiple pulse integration. To the best of our knowledge, this is the first time that frequency reconstruction resolution less than the pulse repetition rate has been demonstrated in PTS-OCT through all-optical compressive sensing, leading to improved depth resolution in OCT measurement.
Mididoddi, C., Wang, G. and Wang, C. (2016). Data Compressed Photonic Time-Stretch Optical Coherence Tomography. in: 2016 IEEE Photonics Conference (IPC).. Available at: http://ieeexplore.ieee.org/document/7830959/.Photonic time stretch enables real-time optical coherence tomography, but at the cost of extreme requirement for high-speed signal acquisition and massive data set. This work reports a data compressed real-time Fourier-domain optical coherence tomography based on photonics-assisted compressive sensing. Compression ratio of 66% is achieved.
Wang, G. and Wang, C. (2016). Diffraction Limited Optical Time-Stretch Microscopy Using an In-Fibre Diffraction Grating. in: Frontiers in Optics (FiO) 2016.. Available at: http://dx.doi.org/10.1364/FIO.2016.FF2A.5.Ultrafast optical time-stretch imaging using a 45° tilted fiber grating as an in-fibre diffraction device is proposed and experimentally demonstrated for the first time featuring high efficiency, complete fiber-compatibility and diffraction-limited lateral resolution.