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In this paper, the first fully integrated 0.15-µm InAlAs/InGaAs metamorphic high electron mobility transistor (mHEMT) divide-by-three injection locked frequency divider (ILFD) with Marchand balun is demonstrated. The mHEMT technology has 110-GHz cutoff frequency and high tranconductance. Moreover, the Marchand Balun on the semi-insulating GaAs substrate has a low-loss property to provide broadband...
We propose an optical data overlay scheme through level-scalable flexible modulation. Using this proposed scheme, Optical multicast overlay over point-to-point unicast in WDM-PON is experimentally demonstrated by scaling up the modulation from QPSK to 16QAM at 10Gbaud.
We demonstrate electro-optic dual-channel coherent signal emulator, where multiplexed signal is artificially generated by using an optical IQ modulator driven with an arbitrary-waveform generator. 2×20-Gb/s dual-carrier QPSK signal generation is emulated.
We propose and demonstrate phase-conjugated twin signals generation using oppositely-biased paired IQ modulators. Phase conjugation is electro-optically realized without relying on electrical-domain processing. Nonlinear phase shift of 20-Gb/s QPSK is experimentally compensated for.
The conventional broadband active noise control (ANC) system may not be able to function well when the target noise contains both wideband and narrowband components simultaneously. Feed-forward hybrid active control has attracted quite a lot attention recently, as it can effectively suppress both components at the same time. Such hybrid ANC system consists of three tightly integrated subsystems, namely,...
Bone conduction has been used for speech enhancement in very noisy environments. It usually includes nonlinearity in transmission, small non-stationary noise due to body movements (friction, collision, wind noise, crosstalk and so on), serious attenuation of high frequency components, etc. These problems usually lead to poor intelligibility of bone-conducted (BC) speech. Recoverying an air-conducted...
In this paper, a nonlinear adaptive noise canceller (ANC) based on the functional link artificial neural network (FLANN) is proposed for extracting fetal electrocardiogram (FECG). The FLANN is placed in parallel with an FIR filter. The two filters are designated to implement the linear and nonlinear mappings between the maternal ECG (MECG) and the composite abdominal ECG (AECG) acquired in the thoracic...
For the first time, we report heterogeneously integrated sub-40nm epi-like Ge/Si monolithic 3D-IC with low-power logic/NVM circuits and efficient photovoltaic energy harvester. Threshold voltage engineering and driving current boosting technologies enable stackable Ge/Si UTB (<15nm) MOSFETs, CMOS inverter and SRAM (SNM=270mV@0.7V) achieve low operation voltage. Stackable 1-T NVM with high speed...
In order to adapt to the dynamics in the future optical networks, we propose and experimentally two flexible high-order quadrature amplitude modulation (QAM) transmitter schemes: i) a flexible transmitter using a tandem in-phase/quadrature (IQ) modulators for generating 16-/32-/64-QAM signals; and ii) a scheme based on monolithically-integrated quad Mach-Zehnder in-phase/quadrature (QMZ-IQ) with binary...
With the recent trend of employing spectrally efficient multi-level modulation formats in optical communication systems, it is highly desirable to exploit the all-optical wavelength conversion (AOWC) schemes for formats, such as 16- or 64- quadrature amplitude modulation (QAM) signals. Since the linear and nonlinear phase noise is transferred with the data to the converted wavelength in AOWC subsystem,...
We propose and investigate Conjugated-Paired Radio-on-Fiber (C-RoF) transmission, which shows high tolerance against optical nonlinearity in optical fiber links, aiming for achieving higher RF link gain. It is shown that the nonlinear distortion is cancelled out by the C-RoF technique.
A V-band dual-conversion down-converter with the Schottky-diode first conversion mixer and the analog Gilbert second conversion mixer is demonstrated using 0.15-μm pseudomorphic high electron mobility transistor (pHEMT) technology. The diode mixer based on quarter-wavelength design methodology occupies a reasonable real estate at millimeter-wave frequency while the analog IF mixer has the size advantage...
We experimentally demonstrate a 50-Gbps 16QAM wavelength conversion with <0.2dB penalty, based on FWM in HNLF using coherent pumps. The coherent pumping makes it independent of the phase noise from pumps and enables the use of cost-effective pump laser.
We propose and experimentally demonstrate optical data exchange scheme between 16QAM and QPSK with narrow spacing of 50GHz. The use of coherent pump makes it free of phase noise from pumps, and enables the use of low-cost DFB as pump source.
Interference alignment (IA) is a scheme to achieve degrees of freedom (DOF) of interference network at high signal-to-noise ratio (SNR). In order to implement IA scheme in frequency-division duplexing (FDD) system, receivers feedback channel state information to transmitters. The key problem is to acquire accurate transmitter channel state information (CSIT) in the presence of the quantization error...
This paper considers the model that two mobile users communicate with a central processer (CP) via two base stations (BSs). The BSs are connected to the CP via orthogonal finite-capacity links. The theoretical capacity of this model is still an open problem. For given capacity of backhaul links, we use private message, common message and joint decoding message to explore a new achievable rate. We...
The power supply system of electrification railway is one kind of electric power supply system with individuality and specialty. In view of the traction network structure and power supply mode in electrified railway, on the basis of comparison of the current fault location methods used in power network, the application of traveling wave to the fault location in the electrified railway traction power...
Interference alignment (IA) is a scheme to approach the capacity at high signal-to-noise ratio (SNR) in multiuser multiple-input multiple-output (MIMO) interference networks. To implement the IA scheme in a frequency-division duplexing (FDD) system, transmitter channel state information (CSIT) is fed back from the receiver with finite bits. However, such CSIT is subject to quantization errors and...
In order to obtain the dynamic characteristics of C-shaped armature, the finite element software Ansoft was used to model the C-shape armature of simple square-bore railgun based on the assumption of no disjunction and ideal complete contact between the armature and rail. Five types of armature, such as monolithic armature, whole chunked armature, forward-back chunked armature, up-down chunked armature...
The reasons and the performance of the dissymmetry of the armature-rail system were studied. The current distribution and its force the dissymmetry of Armature or rail in C-shaped armature were analyzed by finite-element method. The calculation was performed with a monolithic armature. As a preliminary study on the dissymmetry of Armature-rail system, a 40 mm square-bore railgun with an asymmetrical...
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