A5101892596- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Orbital Angular Momentum in Optics
- Near-Field Optical Microscopy
- Plasmonic and Surface Plasmon Research
- Semiconductor Lasers and Optical Devices
- Optical Polarization and Ellipsometry
- Ultra-Wideband Communications Technology
- Neural Networks and Reservoir Computing
- Mechanical and Optical Resonators
- Metamaterials and Metasurfaces Applications
- Gyrotron and Vacuum Electronics Research
- Photonic Crystals and Applications
- Advanced Optical Network Technologies
- Optical Coherence Tomography Applications
- Graphene research and applications
- Advanced Optical Imaging Technologies
- 2D Materials and Applications
- Advanced Fiber Optic Sensors
- Optical measurement and interference techniques
- Radio Frequency Integrated Circuit Design
- MXene and MAX Phase Materials
- Graphene and Nanomaterials Applications
Wuhan National Laboratory for Optoelectronics
2014-2024
Huazhong University of Science and Technology
2014-2024
Nanjing University
2003
Abstract Driven by the increasing demand on handing microwave signals with compact device, low power consumption, high efficiency and reliability, it is highly desired to generate, distribute, process using photonic integrated circuits. Silicon photonics offers a promising platform facilitating ultracompact signal processing assisted silicon nanophotonic devices. In this paper, we propose, theoretically analyze experimentally demonstrate simple scheme realize rejection ratio tunable notch...
The ability to measure the orbital angular momentum (OAM) distribution of vortex light is essential for OAM applications. Although there have been many studies on measurement modes, it difficult quantitatively and instantaneously power among different let alone phase them. In this work, we propose an complex spectrum analyzer that enables simultaneous measurements distributions modes by employing rotational Doppler effect. original mode mapped electrical beat signals using a photodetector....
By using optical phase modulators in a fiber-optical circuit, we theoretically and experimentally demonstrate large control over the spectrum of an impinging signal, which may evolve analogously to discrete diffraction spatial waveguide arrays. The modulation acts as photonic gauge potential frequency dimension, realizing efficient central bandwidth combs. We achieve 50 GHz shift threefold expansion comb, well analogue various refraction phenomena, including negative perfect focusing domain,...
Microwave photonic filter (MPF) is one of the key fundamental subsystems in microwave photonics, and it shows great potentiality numbers applications such as optoelectronic oscillator, frequency measurement, so forth. A narrowband bandpass MPF highly desirable with its high selectivity applications. However, a resonator quality factor (>10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> ) very difficult to fabricate on mature silicon...
We present a theoretical model to sufficiently investigate the optical rotational Doppler effect based on modal expansion method.We find that frequency shift content is only determined by surface of spinning object and reduced linear difference mode index between input output orbital angular momentum (OAM) light, rotating speed as well.An experiment carried out verify model.We explicitly suggest spatial spiral phase distribution determines content.The makes us better understand physical...
Matrix computations are indispensable tools in science and engineering, while the electronic matrix suffered from limited speed. Alternatively, optical methods offered a high-speed solution. The computation is impractical unless it capable of extending to large scale, reconfiguring for general purpose operating with high efficiency. Here, we report experimentally demonstrate an computing processor based on integrated linear network. proposed photonic performing fundamental including XB = C,...
Nonlinear activation functions are crucial for optical neural networks (ONNs) to achieve more various functions. However, the current nonlinear suffer from some dilemma, including high power consumption, loss, and limited bandwidth. Here, we propose demonstrate an all-optical implementation of a function based on germanium silicon hybrid integration. The principle lies in intrinsic absorption carrier-induced refractive index change C -band. It has large operating bandwidth response frequency...
We present a dynamic interferometry to measure the orbital angular momentum (OAM) of beams. An opaque screen with two nonparallel air slits is employed that can be regarded as Young's double-pinhole interference. When OAM beams an annular intensity distribution vertically incident, far-field interference patterns depend on phase difference light in pinholes. scan angle between slits, and output at center changes alternatively darkness brightness. Utilizing this characteristic, we light. This...
We propose and experimentally demonstrate a feasible integrated scheme to solve all-optical differential equations using microring resonators (MRRs) that is capable of solving first- second-order linear ordinary with different constant coefficients. Employing two cascaded MRRs radii, an excellent agreement between the numerical simulation experimental results obtained. Due inherent merits silicon-based devices for computing, such as low power consumption, small size, high speed, this finding...
We put forward a double-slit interference device based on two metal subwavelength slit arrays to measure the orbital angular momentum (OAM) and polarization of beams simultaneously. The serves as localized spatial polarizer, each array can be regarded wide diffraction-slit. When an OAM beam is normally incident upon arrays, fringes twist, displacement depends topological charge beams. present detailed theoretical analysis this measurement model. This model does not need additional reference...
A photonic multiple microwave frequency measurement system is presented and demonstrated based on a swept silicon microring resonator (MRR). The drop-port of high-Q MRR employed as periodic narrowband scanning filter driven by sawtooth voltage signal. unknown can be mapped to time interval between pulse appearances when the modulated signal frequency-to-time mapping established. In experiments, we obtain range 25 GHz with an error ±510 MHz. Meanwhile, resolution for multi-frequency about 5...
All-optical modulators have a wide range of applications and are in great demand for its potential all-optical communications, interconnects signal processing. Two-dimensional materials can modulate light with superior performance, MXene, one the latest additions to world 2D materials, exhibits good electrical conductivity, excellent stability, highly tunable electronic/optical properties. Thus, it is promising practical photonic applications. In this work, an integrated modulator using...
Limited by large transmission loss, the development of transverse electric (TE) mode silicon-on-insulator (SOI) based on-chip long length chirped grating waveguide faces many difficulties now. To overcome this problem, multi-mode with a measured loss 0.7 dB/cm is applied in paper, and spiral Bragg (SBGW) proposed experimentally demonstrated. The SBGW reaches 2.7 cm, which longest SOI reported so far. total group delay to be 628 ps, structure size only 0.3 mm <sup...
We propose and demonstrate a novel switchable microwave photonic filter based on phase modulation. Both high Q bandpass notch with flat passband are achieved respectively. And the switchability between them by tuning two tunable optical filters is demonstrated. also present theoretical model analytical expression for proposed scheme. A frequency response of factor 327 rejection ratio exceeding 42 dB, 34 dB experimentally obtained. The operation around 20 GHz.
We propose and experimentally demonstrate a 4-port passive encoder for 4-bit Gray code on pure silicon platform. The operation principle this device is the thermo-optic (TO) effect in microring resonator (MRR) whose transmission spectrum could be shifted by injecting strong light power. Therefore, output powers of both through-port drop-port MRR controllable switchable. Two threshold are defined to decide port bit "0" or "1". By combining two independent resonant wavelengths MRRs adjusting...
Phased array antennas (PAAs) play a key role in many fields such as radar systems and wireless communication systems. Since PAAs based on optical methods outperform the electronic counterparts beam directivity instantaneous bandwidth, have aroused wide research interests. Here, we report experimentally demonstrate an integrated 4-channel true time delay network for PAAs. The unit is grating-assisted contradirectional coupler, assisted by index chirp engineering asymmetric apodization. A...
We present an expanded all-optical programmable logic array (O-PLA) using multi-input and multi-output canonical units (CLUs) generation. Based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF), two-input three-input CLUs are simultaneously achieved five different channels with operation speed of 40 Gb/s. Clear temporal waveforms wide open eye diagrams successfully observed. The effectiveness the scheme is validated by extinction ratio optical signal-to-noise measurements. computing...
We propose and experimentally demonstrate an approach in generating a pair of polarity-reversed ultra-wideband (UWB) monocycle pulses by using Mach-Zehnder modulator (MZM) semiconductor optical amplifier (SOA). The polarity is controlled adjusting the bias voltage MZM to make point located at positive or negative slope modulation curve. generated UWB monocycles with different injection currents SOA, voltages MZM, pulse widths, carrier wavelengths are studied analyzed. bi-phase (BPM) applying...
We propose and demonstrate an approach to generating large time-bandwidth product (TBWP) frequency-hopping (FH) microwave waveforms by using ultra-high-quality factor (Q) silicon microring resonator (MRR) with thermal tuning. An ultra-high-Q MRR (Q ~ 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> ) is used filter out expected frequency component from optical comb. Heterodyne beating between the filtered another seed light detected a...
We present a flexible method for measuring the orbital angular momentum (OAM) of linearly polarized beam by means metasurface composed V-shaped gold plasmonic antenna. When OAM light illuminates metasurface, ordinary with same polarization and topological charge transmits forward, whereas another two extraordinary beams but cross are tilted respect to beam. The can be detected near-field interferogram beams. is effective detecting transparently in broadband wavelength offers capability...
In this contribution the CMOS photonics technology (LuxG) developed and commercialized by Luxtera is reviewed. The advantages of integration usage a standard foundry toolset/process/practice are discussed with mention to newly 14Gbps transceiver chip.
We propose and experimentally demonstrate an on-chip pulse shaper for 125-GHz microwave waveform generation. The is implemented based on a silicon-on-insulator (SOI) platform that has structure with eight-tap finite impulse response (FIR) there amplitude modulator each tap. By controlling the thermal heaters modulators, we obtain several signals centered at 125 GHz typical envelopes, such as square envelope, triangular sawtooth Gaussian etc. Our scheme some significant advantages, central...
A novel photonic approach to generating a phase-coded microwave signal with precise π phase shift is proposed and demonstrated. The realized based on quadrature keying (QPSK) modulator. In the QPSK modulator, one Mach-Zehnder modulator (MZM) biased at its minimal transmission point achieve carrier suppressed modulation, other paralleled MZM binary-phase modulation. When CSM BPSK are combined output port of generated. Both simulation experiment carried out verify our scheme. scheme exhibits...
Manipulation of orbital angular momentum (OAM) light is essential in OAM-based optical systems. In particular, the OAM divider, which can convert incoming mode into one or several new smaller modes proportion at different spatial paths, very useful networks. However, this tool has rarely been reported. Here, we put forward a passive divider based on coordinate transformation. The device consists Cartesian to log-polar converter and an inverse converter. first converts rectangular-shaped...