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We present an original compact, 10 kHz Ti:Sa regenerative amplifier design that minimizes existing thermal effects allowing to produce 17 fs pulse duration with a 170 mrad shot to shot residual CEP noise.
We propose Raman amplified quasi-single-mode transmission with hybrid few-mode-fiber (FMF) and single-mode-fiber (SMF) span using CO-OFDM signals. The OFDM signal is robust to multi-path interference (MPI) and DD-LMS algorithm can be eliminated.
We present passive UHF RFID electro-textile tags integrated into two types of gloves for wearable RFID applications. The performance of the electro-textile glove-tags is evaluated on a male test subject and the results are compared to glove-tags with copper tape antennas. Based on the achieved results, the read ranges of the electro-textile tags are very close to those of the copper tape tags and...
This article presents the investigation of a millimetre-wave extended interaction oscillation using both pencil and sheet-shaped pseudospark (PS)-sourced electron beams. Two W-band (75–110 GHz) pencil and sheet beam extended interaction oscillators (EIO) were designed and constructed respectively. The PS-sourced pencil beam EIO structure was firstly driven by a four-gap PS discharge operating at 30...
We demonstrate a new post-fabrication trimming technique to fine-tune the phase of integrated Mach-Zehnder Interferometers (MZIs), enabling permanent correction of typical fabrication based phase errors. Preliminary results demonstrate a phase trimming accuracy of 0.146π.
The last decade has seen a lot of progress in attosecond science and high field physics. Generating energetic, few-cycle laser pulses with a stabilized Carrier-Envelope Phase (CEP) constitutes the first step to access the ultrafast dynamics underlying the interaction of matter with intense, ultrashort coherent light source [1-2]. All these developments place rising demands on lasers with higher average...
We review electronic digital-to-analog converter (DAC) technologies with sampling rates beyond 200 GSa/s and analog electrical bandwidths of 100 GHz using digital bandwidth interleaving. These allow the all-electronic generation of up to 195-GBaud electrical and 180-Gbaud optical modulation formats.
We transmitted probabilistically shaped 64-QAM at 7.46 b/s/Hz over a 5,523-km inservice EDFA-only amplified trans-Atlantic cable (5.68 b/s/Hz over a looped-back 11,046 km). Using real-time processing we achieve single-carrier 250-Gb/s 16-QAM at 4 b/s/Hz.
We demonstrate a 218-Gb/s direct detection receiver using Kramers-Kronig optical phase reconstruction and chromatic dispersion compensation based on a single photodiode and achieve single-span transmission over 125 km of standard singlemode fiber at 1550 nm.
Wireless underground sensor networks (WUSNs) based on magnetic induction (MI) have been recently proposed as a promising candidate for underground networking. The benefit of the MI-WUSNs compared to other solutions (e.g. so-called Through-The-Earth communication) is related to the substantially lower path loss and lower vulnerability to the changes of the soil properties. In the past, some efforts...
Dielectric resonator (DR) owns advantages of high quality factor, high power capacity, superior temperature stability, moderate circuit size, etc., emerging as a promising candidate for future small base station systems. According to the field distribution of the DR's fundamental mode, proper excitation schemes are established to differentially feed the DR so that it can be applied in designing balanced/Balun...
Permanent magnet (PM) machines have found wide applications from automotive to aerospace over the past four decades since they offer several key features, such as high torque density, high efficiency, and excellent dynamic performance [1].
Recurrent neural network language models (RNNLMs) have becoming increasingly popular in many applications such as automatic speech recognition (ASR). Significant performance improvements in both perplexity and word error rate over standard n-gram LMs have been widely reported on ASR tasks. In contrast, published research on using RNNLMs for keyword search systems has been relatively limited. In this...
This paper investigates a Wide Area Measurement based robust damping control for multi-infeed VSC HVDC links embedded in the ac system. The feedback signal for the controller design is synthesized from the local and remote signals which results in a good pole-zero separation, which results in improved damping of the swing modes. Furthermore, the paper demonstrates utilization of additional degrees...
Periodic inversion of ferroelectric domains is realized in a lithium niobate waveguide by focused femtosecond near-infrared laser beam. Quasi-phase matched frequency doubling of 815nm light is demonstrated with conversion efficiency as high as 17.45%.
A method to extract five parameters in the single-diode equivalent circuit of a solar cell is described in detail. The parameter extraction is mainly from the knowledge of the sole information contained in the datasheets given by the manufacturer of the solar cell. Besides the information with regard to the most representative points of the I-V curve (short circuit, open circuit, and the maximum power...
Smartphone camera is a very powerful sensor for many intelligent applications. But it is difficult to obtain a stable video quality in an unstable motion environment. In this case, robust and fast video stabilization algorithm is necessary for some intelligent applications on smartphone. A novel rapid and efficient video stabilization algorithm is proposed in this paper. The proposed algorithm not...
Indoor location based services are increasingly important as majority of the population in highly urbanized city lives in high rise buildings. However, without a purposed-built indoor localization system like indoor Global Positioning System (GPS) or extensive survey required by fingerprinting methodology, indoor localization is not possible and useful. In this paper, we demonstrate an error minimization...
A novel compact circularly polarized (CP) microstrip antenna is presented. The antenna introduces a circular radiation patch with a crossed slot to improve the impedance matching and reduce the antenna sizes. Meanwhile, triangular feed patches are adopted to increase the bandwidth. A no-resistor series feed line is used for achieving a high antenna efficiency. Based on the above method, the antenna...
High quality intense electron beams play an important role in high power millimeter-wave and terahertz radiation generation. To this end, the pseudospark-sourced electron beam has been investigated with their applications in different beam-wave interaction structures. Different structures have been designed and modelled using the particle-in-cell codes MAGIC and CST Particle Studio. The experimental...
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