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A microring-Bragg grating based coupling resonant system is experimentally demonstrated to generate switchable EIT-like and Fano transmissions for the first time. The resonance state is dependent on the relation between coupling coefficient and round-trip-intensity-attenuation.
We fabricate a GeSn photonic crystal laser. The simulation shows a high Q-factor and wide spectral tunability. An improved net gain and lowered power consumption are expected via strain-relaxation and reducing active mode volume, respectively.
Due to the low out-of-band emission and robustness against asynchronous transmissions, generalized frequency division multiplexing (GFDM) has potential to be a new modulation scheme for the foreseeable applications. In this paper, a novel precoding scheme with tunable band sizes is proposed for GFDM systems. The precoder and equalizer are jointly designed aiming at minimizing the system total mean...
A new germanium-on-silicon nitride platform is fabricated and tested for mld-lR sensing applications. Waveguides with low bending loss are demonstrated allowing one to design compact on-chip sensors. Spiral waveguide sensors have been studied for potential drug detection and food processing applications.
As a promising technology for 5G, non-orthogonal multiple access (NOMA) has attracted much attention from academia and industry due to its superior spectral efficiency and user fairness, but the error propagation in successive interference cancellation decoding (SIC) might seriously restrict its performance. In this paper, we propose to utilize power allocation to mitigate the impact of imperfect...
A quasi-orthogonal space-time block code (Q-OSTBC) has been proposed to achieve a better multiplexing-diversity tradeoff. With unequal diversity order of symbols, the code can effectively mitigate the error propagation in the successive interference cancellation (SIC) based detector for each user. As well known, non-orthogonal multiple access (NOMA) has been recognized as a promising technique for...
Artificial Immune Recognition System (AIRS) is an algorithm inspired by animal immune system in the biological world. It is specialized in solving pattern recognition problems. Heating, Ventilation and Air Conditioning (HVAC) systems are widely installed in modern buildings to provide the occupants with a satisfactory indoor environment. HVAC systems are the some of the most power consuming equipment...
In order to enable the development of smart services, many IoT platforms were proposed to securely and reliably connect IoT devices to the Internet and to each other. Examples are IoTivity from Open Connectivity Foundation (OCF), AllJoyn from AllSeen Alliance, Weave from Google and HomeKit from Apple. However, such fragmentation of IoT platforms has made the development of IoT applications very difficult...
We demonstrate SOI waveguide with low propagation and bending loss of 2dB/cm and 0.02dB/90° in the broad mid-infrared range of 3.68–3.88μm. By theoretically analyzing loss mechanisms, we indicate SOI waveguide's intrinsic limitation for mid-infrared application.
Despite the widespread installation of access control systems in all places where authorized users to enter, access control systems are still not immature due to the limited technology of convenience, security and low latency. Existing biological method based systems are relatively reliable, such as fingerprint identification, face perception and iris recognition. However, these techniques require...
In aerospace applications, some devices, instruments and equipment suffer the harsh environment, as extremely low temperature and wide temperature ranges for instance. The solder joints which are fragile and sensitive to the thermal and mechanical environment are part of the electronic control systems that are important to the devices. Sn-based alloy has been the mostly used solder material of electronic...
The rapid advances of transportation infrastructure have led to a dramatic increase in the demand for smart systems capable of monitoring traffic and street safety. Fundamental to these applications are a community-based evaluation platform and benchmark for object detection and multi-object tracking. To this end, we organize the AVSS2017 Challenge on Advanced Traffic Monitoring, in conjunction with...
Prediction of aircraft Auxiliary Power Unit (APU) degradation plays an important role in aircraft health monitoring and condition-based maintenance. Due to complexity of the system and the variability and stochastic nature of the working environment, the degradation of the APU engine is hardly to be described by traditional deterministic time series analysis. Alternatively, advanced probabilistic...
This paper presents a dimensionless characteristic indicator for automatic bearing fault diagnosis based on ensemble empirical mode decomposition (EEMD). Firstly, the bearing vibration components called the Intrinsic Mode Functions (IMFs) are obtained by EEMD. Secondly, all IMFs are selected to reconstruct a new signal according to the rule of the kurtosis greater than 3. Then the new signal is processed...
A dual-band optical filter based on a single microring resonator embedded with nanoholes is theoretically and experimentally demonstrated for the first time. A numerical model based on transfer matrix method is utilized to simulate the performance of this device. The coupling between the microring resonator and the Fabry-Pérot resonator formed by nanoholes gives rise to the dual-band optical filtering...
In this paper, we present our recent results on the development of passive devices for short-wave infrared and MIR applications. SOI platform is used and several devices, like waveguides, MMIs, spirals, unbalanced MZI, are designed, fabricated and characterized at the wavelengths of 2μm and 3.8μm.
We report on the design and fabrication of silicon Bezier bends for the communication wavelength of 1550 nm. By varying the Bezier parameter B, the bend losses can be controlled for different bend radius. At a bend radius of 2 μm, bend losses of 0.0652 to 0.269 dB per 180o bend is experimentally demonstrated for the TE polarization using silicon channel waveguide with width 500nm, and height 220nm...
Near-infrared nanophotonics has been massively studied due to its promising ability in addressing the interconnect bottleneck problem [1] and achieving resonator-based sensors with high quality factor [2] [3]. Among the various material platforms that have been applied in near infrared nanophotonics, silicon-on-insulator (SOI) platform offers advantages such as high optical mode confinement, low loss,...
The successful fabrication of MIR Ge-on-Si waveguides written by both the high-resolution electron beam lithography (EBL) approach, as well as the wafer scale, high throughput approach using 365 nm i-line stepper lithography is reported. A low propagation loss of ∼2.7 dB/cm at a wavelength of 3.8 μm is shown for Ge-on-Si waveguides patterned using the i-line stepper. The waveguide etching technique,...
We engineered the localized color centers in two-dimensional hexagonal boron nitrides (hBN) monolayers using laser writing. A 4 nm narrow linewidth, well polarized and single photon emission with 3–4 ns short lifetime was observed in the vicinity of the irradiated region.
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