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A quarter-rate 51Gb/s PAM4 CDR with decoded dual-NRZ outputs is presented for 400GbE optical transceivers. A baud-rate data-only sampling PD with zero-crossing integrating front-end is proposed to minimize the clock generation and distribution overhead, as well as improving the noise resilience under PAM4 low-SNR inputs. Measurement results show the CDR features 1.08ps RMS clock jitter, 3.4×10−9 PAM4...
Circular-core single-mode polymer waveguides with a graded-index profile were designed and fabricated using the Mosquito method. Their optical characteristics and high speed performance were evaluated with a data rate of 25 Gb/s at 1550 nm.
We studied the propagation speed of fiber fuse using heterodyne detection method by analyzing the Doppler shift based on short-time Fourier transform. We observed periodic velocity changes about 160 μs with a constant launched power.
Vienna rectifiers are widely utilized in various industry applications due to low cost, high reliability and better EMI performance. However, the DC bus voltage balancing is always an issue to be considered due to the 3-level structure. Several DC bus balancing control methods are proposed during last decade. But these methods either require a large amount of calculations or cause inaccuracy at voltage...
Nowadays, with the development of navigation and location, many kinds of outdoor locating methods are surveyed and used, such as Global Position System (GPS) and LTE fingerprint-based positioning system. However, as the most compelling focus, the localization accuracies of these systems are limited by the location systems themselves. Therefore, in order to improve the localization accuracy, we should...
In recent years, the high resolution, high precision and high sensitivity telescopes have been widely developed for astronomical observation in the world, such as SKA, Arecibo, ALMA and MingantU SpEctral Radioheliograpy (Muser). Along with these newly developed modern telescopes, a “big data” challenge was raised for data storage and processing. For example, Muser produces about 4.3TB raw data for...
With the rapid development of cloud computing, the Internet of things, big data has become one of the hot spots of society, but also a major focus of applied research, made many service sectors to become data-driven organizations, which exploit the value of big data resources to gain competitive advantage. The meteorological department and the Internet online monitoring collected a large number of...
We experimentally demonstrate, for the first time, a second-order few-mode distributed Raman amplifier with 4 dB mode-equalized gain. The noise figure improvement of the LPoi andLPn modes are respectively 1.2 dB and 1.1 dB compared with first-order Raman amplification scheme. We also use optical time-domain reflectometer (OTDR) to measure the signal evolutions, and the results confirm the low noise...
The effect of gamma radiation with a maximum dose of 180 kGy at a dose rate of 10.15 kGy/hour on both standard Ge-doped fiber Bragg Gratings (Ge-FBG) and femtosecond-laser-inscribed pure-silica-core fiber Bragg Gratings (FL-PS-FBG) have been investigated. In the case of Ge-FBGs, a maximum Bragg wavelength shifts (BWS) of 140 pm and a decrease of the reflection peak power of 16 dB has been observed...
The flexjoint of TLP (Tendon Leg Platform) tendon connector is designed to provide flexibility in rotation while bearing vertical load. The flexjoint is spherical and consists of laminated rubber and metal layers. It's necessary to study the effects of Poisson's ratio and compressibility of the rubber on the flexjoint. Meanwhile, the effect of the number of metal layers is also studied. The 2D axisymmetric...
Recent research endeavors have shown the potential of using feed-forward convolutional neural networks to accomplish fast style transfer for images. In this work, we take one step further to explore the possibility of exploiting a feed-forward network to perform style transfer for videos and simultaneously maintain temporal consistency among stylized video frames. Our feed-forward network is trained...
This paper selected the 29 shares of listed companies as samples, including 13 shadow banks. This paper will use the company's shares daily closing price as the research sample and use GARCH model to calculate the VaR and CoVaR value of the company's share price gains. The empirical results show that compared with the traditional banking institutions, shadow banking institutions risk spillover effect...
PHM (Prognostics and Health Management) is an engineering technology focusing on failure prognostics and so it has critical effects on the performance of the task system. In this paper, the qualitative analysis method of FMEA (Failure Mode and Effects Analysis) is proposed to analyze the prognostics' performance of PHM system and five corresponding evaluation parameters are derived. Based on some...
We propose a novel FOCS based on polarization diversity and a real-time state of polarization (SOP) measurement to eliminate the degradation of the Faraday effect and determine the actual rotation angle of the sensing fiber.
The relation between music and emotions has been investigated for decades. Most of the studies focused on short clips and were designed with specific tasks. This paper investigated the emotional states from electroencephalogram (EEG) activities during music appreciation. An emotion evoked experiment paradigm was designed during music appreciation. The EEG signals were recorded in 15 healthy adults...
In this article, we proposed a MARI&A model for single-unit and two-unit system maintenance. The model is combinations of arithmetic reduction of failure intensity and virtual age, which can be apply to continuous operating system with corrective maintenance and preventive maintenance during its maintenance process. Failure interactions and maintenance interactions among units are also taken into...
This paper makes the first attempt to utilize convolutional neural network (CNN) for classification of solar radio spectrums. The solar radio spectrum is a two-dimensional gray-scale image with one dimension of frequency and the other of time. Taking the advantages of CNN, we can efficiently learn the distinct characteristic of different types of spectrum, and further classify them even more accurate...
This paper makes the first attempt to utilize long short-term memory (LSTM) for classification of solar radio spectrum. A solar radio spectrum is a gray-scale image representing solar radio radiation over multiple frequency channels and in a short time period. The vertical and horizontal dimensions of a spectrum correspond to frequency channel and time, respectively. Intrinsically, time dependence...
In this paper, we propose an user-oriented graph based frequency allocation algorithm for downlink transmission in the heterogeneous network. As different users may use different communication service, they would have different data rate requirement. It is critical to fulfill all users' traffic demand before enlarging the system throughput. So, the optimization objective is simultaneously improving...
Currently, the indoor navigation has attracted lots of attention and been considered as the most prominent technology in the future. However, the biggest obstacle that hinders the promotion of the indoor navigation is the cost of building floor map. In the unknown indoor environment, it will take a lot of resources to acquire or build indoor floor map. Therefore, in this paper, in order to reduce...
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