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In this paper, a 1.8-V 3-bit quadruple-sampling delta-sigma modulator for audio application is presented. To performance high-resolution and low-cost modulator, a single opamp is used to complete the integration with four phases. Since the phase difference between any two succeeding clocks is 90 degrees, the sampling rate will be four times of clock frequency. The effective integration time can also...
In this paper, a compact omnidirectional circularly polarized (CP) cylindrical dielectric resonator antenna (DRA) is presented. The DRA is excited in its TM01δ mode by a probe located at the center, giving linearly polarized (LP) omnidirectional radiation patterns. Four interleaved strips serving as a wave polarizer are placed on the top of the DRA. By tuning the strips, the LP fields can be changed...
We propose a versatile optical filter with precisely reconfigurable shape based on stimulated Brillouin scattering effect in optical fiber using digital feedback compensation. Filter application for optical sub-band separation-aggregation of multi-band OFDM signal is demonstrated.
We propose a rectangular optical filter based on stimulated Brillouin scattering in fiber with tunable bandwidth from 50 MHz to 4 GHz at 15-MHz tuning resolution. The steep-edged rectangular shape of the filter is precisely controlled utilizing digital feedback revision of the pump light. The passband ripple is ∼1 dB by nonlinearity management of the pump and using the fiber with a single Brillouin...
We demonstrate a rectangular optical filter based on stimulated Brillouin scattering with bandwidth from 50 MHz to 4 GHz. The passband ripple is ∼1 dB by nonlinearity management of the pump lines and using fibre with a single Brillouin peak.
A novel absorption band-pass filter (ABF) with wide relative bandwidth and compact structure is proposed and investigated. The ABF consists of two identical 3dB directional coupler (DTC) and two identical reflecting band-pass filters (RBF), which are all based on Microstrip line structure. Firstly, Compared with conventional LC filter, this novel filter has higher passband frequency, broader relative...
As an alternative of parabolic reflectors, microstrip reflectarrays inherit their many merits as well as those of conventional antenna arrays. This work is focused on solving the problem of terahertz (THz) beam scanning by reflectarrays. The proposed reflectarray is demonstrated based on novel single-layered elements with a linear phase delay and multi-frequency phase-matching method. An operating...
A novel absorption band-pass filter (ABF) with wide relative bandwidth and compact structure is proposed and investigated. The ABF consists of two identical 3dB directional coupler (DTC) and two identical reflecting band-pass filters (RBF), which are all based on Microstrip line structure. Firstly, Compared with conventional LC filter, this novel filter has higher passband frequency, broader relative...
This paper presents the architecture of OFDM-based optical network capable of sub-wavelength granularity scheduling and switching, along with its beneficial analysis including cost saving, resource usage efficiency, and adaptive physical-layer impairment tolerance.
A new networking approach based on IP/optical OFDM technologies is proposed, providing an adaptive mechanism of bandwidth provisioning and pipe resizing for dynamic traffic flows. A comparison study is presented to demonstrate its advantages.
Optical fiber-based access networks are being deployed to address the increasing demand for bandwidth and help to support multiple services. As for the future optical access networks, different technologies have been proposed and under investigations, including WDM-based passive optical networks (WDM-PON), optical coding division multiplexing -based PON (OCDM-PON), and orthogonal frequency division...
A new programmable router interface with adaptive packet over optical OFDMA transmission is proposed, providing a perfect mechanism of bandwidth partition for link virtualization. A comparison study is presented to demonstrate its advantages.
A specific problem of creating virtual networks on demand in an optical substrate network with programmable routers and ROADMs is investigated. The formulation of the problem together with a heuristic algorithm as a solution is presented.
Distributed defense of DDoS (Distributed Denial of Service) attack has been extensively researched in recent years and control-based defense is a hopeful way. However, existed methods only deal with bandwidth protection. The paper takes defense of DDoS flood as a kind of Processing and Bandwidth Resources allocation and solves it using control theory. Our defense mechanism FFDRF (Feedback Filtering...
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