Jiangbo Zhu

Jiangbo Zhu
Northumbria University · Department of Mathematics, Physics and Electrical Engineering

PhD
A fully-funded PhD studentship is available! Feel free to get in touch: jiangbo.zhu@northumbria.ac.uk

About

73
Publications
11,353
Reads
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1,726
Citations
Introduction
My research interests include but are not limited to 1) Structured light theories and their applications in photonic integrated circuits; 2) Novel solutions for key components and optical fibres for next-generation space- and mode-division multiplexing communication systems.
Additional affiliations
May 2020 - present
Northumbria University
Position
  • Lecturer
January 2018 - January 2019
University of Glasgow
Position
  • Research Associate
September 2015 - May 2020
University of Bristol
Position
  • Research Associate
Education
September 2010 - August 2015
Fudan University
Field of study
  • Electrical Engineering
September 2005 - August 2010
Fudan University
Field of study
  • Electrical Engineering

Publications

Publications (73)
Article
Full-text available
Emerging applications based on optical beams carrying orbital angular momentum (OAM) will probably require photonic integrated devices and circuits for miniaturization, improved performance, and enhanced functionality. We demonstrate silicon-integrated optical vortex emitters, using angular gratings to extract light confined in whispering gallery m...
Article
Full-text available
We report the first demonstration of a direct interaction between the extraordinary transverse spin angular momentum in evanescent waves and the intrinsic orbital angular momentum in optical vortex beams. By tapping the evanescent wave of whispering gallery modes in a micro-ring-based optical vortex emitter and engineering the transverse spin state...
Article
Full-text available
Mode sorting is an essential function for optical systems exploiting the orthogonality of photonic orbital angular momentum mode space. The familiar log-polar optical transformation provides an efficient yet simple approach, however with its resolution restricted by a considerable overlap between adjacent modes resulting from the limited excursion...
Article
Full-text available
With the amplitude, time, wavelength/frequency, phase, and polarization/spin parameter dimensions of the light wave/photon almost fully utilized in both classical and quantum photonic information systems, orbital angular momentum (OAM) carried by optical vortex modes is regarded as a new modal parameter dimension for further boosting the capacity a...
Article
Full-text available
The ability to rapidly switch between orbital angular momentum modes of light has important implications for future classical and quantum systems. In general, orbital angular momentum beams are generated using free-space bulk optical components where the fastest reconfiguration of such systems is around a millisecond using spatial light modulators....
Preprint
In this paper, to accurate characterize the low inter-mode-group (inter-MG) coupling of the low-crosstalk ring-core fiber (RCF), we propose a modified inter-mode coupling characterization method based on swept-wavelength interferometry measurement, in which an integral calculation approach is used to eliminate significant sources of error that may...
Article
A two-layer switch exploiting orbital angular momentum (OAM) and wavelength of the light as switching domains is presented, aiming to increase the scalability with respect to the single-layer switches. The switch is able to accept 160 optical Gaussian data inputs on a 16-channel wavelength division multiplexing (WDM) grid and direct each input sign...
Article
A four-orbital angular momentum (OAM) modes converter consisting of the cascade of an OAM demultiplexer and an OAM multiplexer is implemented and characterized. The OAM multiplexer is realized with an integrated photonic circuit based on four tunable OAM emitters, i.e. the order of the emitted OAM mode can be selected by thermal tuning. It works on...
Preprint
Full-text available
Recent experiments in orbital angular momentum multiplexing have demonstrated its potential for improving the link capacity in optical interconnection networks. Meanwhile, compact photonic integrated orbital angular momentum (de-)multiplexing devices are needed to address requirements such as high scalability, fast configurability, low cost and low...
Article
Full-text available
Full angular momentum states constitute a complete and higher state space of a photon, which are significant not only for fundamental study of light but also for practical applications utilizing cylindrical optics such as optical fibers. Here we propose and demonstrate a simple yet effective scheme of combining the spiral transformation with Pancha...
Conference Paper
8-OAM modes each carrying 10 wavelengths with 2.56-Tbit/s aggregated capacity and 10.24-bit/s/Hz spectral efficiency have been transmitted over 50-km specially designed ring-core fiber, using a compact OAM mode sorter and only modular 4×4 MIMO equalization.
Preprint
Full-text available
8-OAM modes each carrying 10 wavelengths with 2.56-Tbit/s aggregated capacity and 10.24-bit/s/Hz spectral efficiency have been transmitted over 50-km specially designed ring-core fiber, using a compact OAM mode sorter and only modular 4x4 MIMO equalization.
Article
Full-text available
The unique modal characteristics of ring core fibres (RCFs) potentially enable the implementation of mode-division multiplexing (MDM) schemes that can increase optical data transmission capacity with either low complexity modular multiinput multi-output (MIMO) equalization or no MIMO equalization. This paper attempts to present a comprehensive revi...
Article
Full-text available
Cylindrical vector vortex (CVV) beams, complex light fields that exhibit a vector nature and carry quantized orbital angular momentum (OAM) states, have been widely investigated due to their rich applications. Current technologies to generate CVV beams using individual polarization and spatial phase manipulations suffer from bulky size and low conf...
Article
Full-text available
We propose and demonstrate a scalable mode division multiplexing scheme based on orbital angular momentum modes in ring core fibers. In this scheme, the high-order mode groups of a ring core fiber are sufficiently de-coupled by the large differential effective refractive index so that multiple-input multiple-output (MIMO) equalization is only used...
Conference Paper
A 4OAMx4WDM switching experiment has been carried out combining an innovative integrated tunable OAM multiplexer based on 4-concentric omega-shaped silicon waveguides and a refractive element-based OAM demultiplexer; operation is demonstrated up to 120Gb/s.
Conference Paper
We put forward a more generalized spiral transformation for vortex mode sorting with better separation between adjacent modes. We confirm this theoretical prediction with a compact vortex mode sorter fabricated on a thin quartz plate.
Article
Full-text available
Cylindrical vector vortex (CVV) beams, complex light fields that exhibit a vector nature and carry quantized orbital angular momentum states, have been widely investigated due to their rich applications. Current technologies to generate CVV beams using individual polarization and spatial phase manipulations suffer from bulky size and low configurab...
Conference Paper
A mode-group (de)multiplexing scheme independent of random degenerate mode mixing in the fiber is proposed. Successful transmission of two multiplexed OAM MG over 1-km graded-index ring-core fiber is experimentally demonstrated by using this technique.
Conference Paper
We demonstrate a vertical-cavity surface-emitting laser, with an integrated all-dielectric metasurface, generating vortex-like coherent state in the Laguerre-Gauss basis. This coherent photonic device was theoretically calculated and experimentally characterized to achieve both high transmission efficiency and high OAM purity.
Article
Full-text available
A simple and ultra-compact integrated optical vortex beam receiver device is presented. The device is based on the coupling between the optical vortex modes and whispering gallery modes in a micro-ring resonator via embedded angular gratings, which provides the selective reception of optical vortex modes with definitive total angular momentum (summ...
Conference Paper
We demonstrate an integrated photonic orbital angular momentum beam multiplexer consisting of four nested arc waveguide gratings. Well-defined OAM mode emissions over wide bandwidth of 1-nm enables simultaneous wavelength division multiplexing and OAM multiplexing.
Article
Optical vortices (OVs) refer to a class of cylindrical optical modes with azimuthally varying phase terms arising either from polarization rotation or from the angular projection of the wave vector that at the quantum level corresponds to photon spin or orbital angular momenta. OVs have attracted the attention of researchers in many areas of optics...
Article
An integrated approach to thermal modulation of relative phase between two optical vortices with opposite chirality has been demonstrated on a silicon-on-insulator substrate. The device consists of a silicon-integrated optical vortex emitter and a phase controlled 3 dB coupler. The relative phase between two optical vortices can be actively modulat...
Article
Full-text available
For long distance orbital angular momentum (OAM) based transmission, the conventional whole beam receiving scheme encounters the difficulty of large aperture due to the divergence of OAM beams. We propose a novel partial receiving scheme, using a restricted angular aperture to receive and demultiplex multi-OAM-mode beams. The scheme is theoreticall...
Article
Harnessing the Orbital Angular Momentum (OAM) of light is an appealing approach to developing photonic technologies for future applications in optical communications and high- dimensional Quantum Key Distributions (QKD). An outstanding challenge to the widespread uptake of the OAM resource is its efficient generation. We design a new device which c...
Article
Orbital angular momentum (OAM) represents an additional degree of freedom of a light beam, to be added to the standard ones (e.g. polarization, wavelength) [1-2]. Previously, we have demonstrated an integrated device for OAM generation, in which the Whispering Gallery mode (WGM) of the micro-ring resonator to a propagating OAM mode by using an angu...
Article
Electrical switching of the orbital angular momentum (OAM) mode order emitted from an SOI microring resonator is reported. The integration of the microring with waveguide couplers is used to demonstrate modulation of the relative phase between pairs of OAM modes with opposite signs.
Article
We develop a model for angular grating-based optical vortex emitters based on the cylindrical coupled-mode theory. The guided and radiated modes are calculated, and the impact of grating size on the radiation power is discussed.
Article
Full-text available
The generation of light beams carrying orbital angular momentum (OAM) has been greatly advanced with the emergence of the recently reported integrated optical vortex emitters. Generally, optical vortices emitted by these devices possess cylindrically symmetric states of polarization and spiral phase fronts, and they can be defined as cylindrical ve...
Conference Paper
On-chip electrical modulation of relative phase between pairs of optical vortices with opposite signs has been demonstrated, enabling useful functions in lab-on-chip, communications and sensing applications.
Conference Paper
Fast tuning of the Optical Angular Momentum (OAM) order of a vortex beam is demonstrated with 20μs switching times using a compact silicon photonic device.
Article
We propose a novel scheme to expand the inherent limit in the product of the optical delay and the transmission bandwidth in resonator-based delay lines, with the optical orthogonal frequency division multiplexing (OOFDM) technique. The optical group delay properties of a single ring resonator were theoretically studied, and double-carrier OOFDM si...
Article
Full-text available
We develop a theoretical model for the recently reported integrated optical vortex beam emitters that incorporate angular gratings in microring resonators. Using azimuthally polarized dipole oscillators to represent emissions scattered from the grating elements that are located along the inner wall of the ring waveguide, we obtain expressions for f...
Article
In this paper, the multi-carriers generation scheme based on only one integrated IQ modulator is investigated theoretically and numerically. The appropriate values of driving and biasing parameters and the symmetry of the flatness variance distribution of the generated multi-carriers are presented in theory and verified through simulation. Eleven f...
Article
We propose and experimentally demonstrate a novel scheme to generate optical frequency-locked multicarriers by using double recirculation frequency shifter loops based on different frequency shifting direction single-sideband modulation in I/Q modulators driven by RF clock signals. By changing the phase difference of I and Q RF drive signal, each l...
Conference Paper
We propose a novel scheme to realize large group delay in a single ring resonator with an OFDM transmitter. The fundamental trade-off between transmission bandwidth and delay can be addressed with this new buffer.
Article
µ-law companding and de-companding, which enlarges small signals and compresses large signals, can work successfully in the CO-OFDM transmission system, and µ=1 is the optimal companding coefficient for PAPR reduction.
Article
We propose and demonstrate a novel scheme to generate a large number of flattened optical subcarriers at low insertion loss using only cascaded phase modulators driven by different frequencies asynchronous sinusoidal sources for Tb/s communication.
Article
We propose a modified minimum-shift keying (MSK) modulation scheme by applying the imbalanced bias on the in-phase and quadrature components of a MZM-based MSK modulator. This scheme enables constant envelope and continuous temporal phase shift of 100Gb/s optical MSK signal by driving the MZMs with traditional sinusoidal signal instead of triangle...
Article
We investigate to generate coherent and frequency-lock optical multi-carriers by using cascaded phase modulators and recirculating frequency shifter (RFS) based on an EDFA loop. 113 coherent and frequency-lock subcarriers with tone-to-noise ratio larger than 26dB are generated. The amplitude difference of subcarriers obtained after a tilt filter co...
Article
In this paper, we describe the impact of quadrature imbalance (QI) in the presence of frequency offset in an optical coherent offset quadrature phase shift keying (OQPSK) receiver. Arbitrary conjugate misalignment was realized in a 2×4 90° optical hybrid, and the ellipse correction (EC) method of quadrature imbalance was applied in our simulation....
Article
Full-text available
We investigate to generate coherent and frequency-lock optical multi-carriers by using cascaded phase modulators and recirculating frequency shifter (RFS) based on an EDFA loop. The phase and amplitude relation of RF signals on two cascaded phase modulators and the impact of EDFA gain are investigated. Experimental results are in good agreement wit...
Conference Paper
A novel concept of multi-wavelength source is presented. We have simulated the performance by numerically solving the multimode rate equations of the system. 7 carriers are obtained, with flatness less than 5 dB.
Conference Paper
A novel concept of multi-wavelength source is presented. We have derived the theoretical model of the device which uses a semiconductor ring laser and a Michelson Interferometers, and simulated the performance by numerically solving the multimode rate equations of the system. 7 carriers are obtained, with flatness less than 5 dB.
Article
Fast wavelength-tunable semiconductor lasers will be the key components in future optical packet switching networks. Especially, they are of great importance in the optical network nodes: transmitters, optical wavelength-routers, etc. In this paper, a new scheme of a next-generation fast tunable ring laser was given. Tunable lasers in this design h...
Article
Optical minimum-shift keying (MSK) format has constant envelope and continuous temporal phase shift, and exhibits a promising application for its high compact spectrum. Coherent detections have been proved to be effectively for the significant improvement of receiver sensitivity. In this paper, a heterodyne detection scheme to demodulate 40Gb/s MSK...
Article
We demonstrate electrically-pumped room-temperature continuous-wave lasing in InP-based micro-disc lasers with threshold current of 6.5mA. A non-concentric hole inside the disc is used to extract the light and control the lasing mode.
Article
We propose algorithm to compensate frequency offset in optical coherent MSK system with little computation requirement. Simulations are performed to demonstrate the algorithm and its performance is excellent.
Article
We propose a novel advanced orthogonal modulation format dark return-to-zero frequency shift keying/differential phase shift keying (DRZ-FSK/DPSK) and its realization scheme. The DRZ-FSK/DPSK is generated by the combination of a 40-Gb/s return-to-zero (RZ) signal and a DRZ signal which is converted from the RZ using a semiconductor optical amplifie...