How to compute the atomic stress objectively? (2008)
Atomistic simulation has been a powerful study tool in mechanics research, but how to objectively compute the atomic stress equivalent to Cauchy stress is still controversial, especially on the...
2.5 V passive CMOS mixer with 20 dBm P1 dB compression (2008)
De Backer, E, Bauwelinck, J, Melange, C, Matei, E, Ossieur, P, Qiu, X, ...
A passive CMOS downconversion mixer with LO buffer is presented in 0.25 mu m SiGe BiCMOS using a 2.5 V supply. With a 60 MHz RF signal input, measurements show that the conversion loss is 2.9 dB, the...
Chen, W, Bauwelinck, J, Ossieur, P, Qiu, X, Vandewege, J
This paper describes a digitally controlled on-chip monotonic Reference Current Generator (RCG) with 8-bit resolution and a LSB (Least Significant Bit) current as low as 100 nA. It was designed as a...
2.5 V 35 dBm IIP3 75 MHz sixth-order active RC filter (2008)
De Backer, E, Bauwelinck, J, Melange, C, Matei, E, Ossieur, P, Qiu, X, ...
A differential sixth-order Butterworth Sallen-Key lowpass filter in 0.25 mu m SiGe BiCMOS, using a 2.5 V supply, is presented. The filter has a 75 MHz cutoff frequency and an attenuation of more than...
Baekelandt, B, Melange, C, Bauwelinck, J, Ossieur, P, De Ridder, T, Qiu, X, ...
We present an analysis of linear in-band crosstalk in high split long reach wavelength/time-division-multiplexing passive optical networks (WDM-TDM PONs). In this letter, a mathematical model is...
High dynamic range 60 MHz powerline front-end IC (2008)
Bauwelinck, J, De Backer, E, Melange, C, Matei, E, Ossieur, P, Qiu, X, ...
Presented for the first time, is a novel broadband powerline front-end realised in 0.25 mu m SiGe BiCMOS with superior performance. The frequency range of the transmitter (TX) and the direct...
BiCMOS variable gain transimpedance amplifier for automotive applications (2008)
De Ridder, T, Ossieur, P, Yin, X, Baekelandt, B, Melange, C, Bauwelinck, J, ...
A new BiCMOS variable gain transimpedance amplifier with a large area integrated photodiode for automotive applications is presented. Through careful control of the input pole position and the...
An improved current-mode squarer/divider circuit for automotive applications (2008)
Yin, X, Ossieur, P, De Ridder, T, Bauwelinck, J, Qiu, X, Vandewege, J
A current-mode squarer/divider circuit with a novel translinear cell is presented for automotive applications. The proposed circuit technique increases the accuracy of the squarer/divider function...
1.25 Gbit/s ITU-T G.984.2 burst-mode transimpedance amplifier without reset pins (2007)
Ossieur, P, De Ridder, T, Bauwelinck, J, De Backer, E, Gillis, J, Qiu, X, ...
A DC-coupled burst-mode transimpedance amplifier including fast automatic gain control is presented. By employing common-mode level signalling, a reset signal is provided without adding additional...
Chen, W, Bauwelinck, J, Ossieur, P, Qiu, X, Vandewege, J
This paper describes a current-steering Digital-to-Analog Converter (IDAC) architecture with a novel switching scheme, designed for GPON Burst Mode Laser Drivers (BMLD) and realized in a 0.35 mu m...
Simulations and experiments on the effective optical gain of FEC in a GPON uplink (2007)
Yi, Y, Verschuere, S, Lou, Z, Ossieur, P, Bauwelinck, J, Qiu, X, ...
This letter studies the effective optical gain of Reed-Solomon (RS) forward-error correction (FEC) in a burst-mode gigabit passive optical network (GPON) uplink. Numerical simulations are made of the...
Nonintrusive fiber monitoring of TDM optical networks (2007)
De Mulder, B, Chen, W, Bauwelinck, J, Vandewege, J, Qiu, X
This paper introduces a new embedded nonintrusive fiber-monitoring technique for time-division-multiplexing optical networks. It allows an optical transmitter to characterize the fiber plant from...
Chen, W, De Mulder, B, Vandewege, J, Qiu, X, Bauwelinck, J, Baekelandt, B
A low cost embedded OTDR method is presented for monitoring the fiber plant of TDM optical networks without extra optical components nor performance penalty. It localizes abrupt changes in link...
Analog front-end ASIC requirements for a FDM broadband powerline system enabling co-existence (2007)
Bauwelinck, J, De Backer, E, Mélange, C, Qiu, X, Vandewege, J
This paper presents a feasible set of analog ASIC requirements optimized to achieve co-existence in a broadband Power Line Communications (PLC) system based on Frequency Division Multiplexing (FDM)....
Integrated metro and access network: PIEMAN (invited paper) (2007)
Talli, G, Chow, C, Townsend, P, Davey, R, De Ridder, T, Qiu, X, ...
We describe progress to date on the IST project PIEMAN (Photonic Integrated Extended Metro and Access Network, www.ist-pieman.org), which aims to build a radically new photonic (all-optical)...
Low-cost non-intrusive fiber monitoring in a PON last drop (2007)
Vandewege, J, Qiu, X, Chen, W, De Mulder, B, Bauwelinck, J, Baekelandt, B
Long reach passive optical networks (invited paper) (2007)
Townsend, P, Talli, G, Chow, C, MacHale, E, Anthony, C, Davey, R, ...
We discuss recent progress in the development of optically amplified, long reach passive optical networks, which aim to significantly reduce network complexity and cost by integrating metro and...
Impact of crosstalk on multi-wavelength high split PON networks (2007)
Baekelandt, B, Mélange, C, Ossieur, P, Bauwelinck, J, De Ridder, T, Qiu, X, ...
Study on a next generation 10 Gb/s long reach DWDM passive optical network (abstract (2007)
Mélange, C, Baekelandt, B, Bauwelinck, J, Qiu, X, Vandewege, J
Utilizing total scattering to study the Jahn-Teller transition in La1-xCaxMnO3 (2007)
Bozin, ES, Qiu, X, Worhatch, RJ, Paglia, G, Schmidt, M, Radaelli, PG, ...
Analog front-end ASIC requirements for a FDM broadband powerline system enabling co-existence (2007)
Bauwelinck, J, De Backer, E, Melange, C, Qiu, X, Vandewege, J, Thornton, C, ...
This paper presents a feasible set of analog ASIC requirements optimized to achieve co-existence in a broadband Power Line Communications (PLC) system based on Frequency Division Multiplexing (FDM)....
Influence of random DC offsets on burst-mode receiver sensitivity (2006)
Ossieur, P, De Ridder, T, Qiu, X, Vandewege, J
This paper presents the influence of random direct current (dc) offsets on the sensitivity of dc-coupled burst-mode receivers (BMRxs). It is well known that a BMRx exhibits a noisy decision...
High-speed active-input cascode current mirror (2006)
Bauwelinck, J, Ossieur, P, Qiu, X, Vandewege, J
A high-speed active-input cascode current mirror is presented. The proposed configuration combines a high output impedance with the high-frequency performance of a source- or emitter-driven...
Study of temperature dependent atomic correlations in MgB$_{2}$ (2006)
Campi, G., Cappelluti, E., Proffen, Th., Qiu, X., Bozin, E. S., Billinge, S. J. L., ...
We have studied the evolution with temperature of the local as well as the average crystal structure of MgB$_2$ using the real-space atomic pair distribution function (PDF) measured by high...
A 200 MHz 12-bit current-steering DAC in 0.35 µm CMOS (2006)
De Backer, E, Bauwelinck, J, Qiu, X, Vandewege, J
In this paper a 12 b 200 MHz digital-to-analog (D/A) converter integrated in a digital 0.35µm CMOS technology is presented. The 12 b DAC is based on a current steering double segmented 6+2+4...
Bozin, ES, Qiu, X, Schmidt, M, Paglia, G, ...
The local and intermediate structure of La1-xCaxMnO3 has been studied in the orthorhombic (O) and pseudo-cubic (O′) phases, both as a function of temperature (x=0.00), and as a function of Ca...
Chen, W, Bauwelinck, J, Ossieur, P, Qiu, X, Vandewege, J
This paper describes a digitally controlled on-chip monotonic reference current generator with 8-bit resolution and a LSB (Least Significant Bit) current as low as 100 nA. It was designed as a...
A scalable network ASIP enabling flow awareness in ethernet access (2006)
Van Renterghem, K, Verhulst, D, Verschuere, S, Demuytere, P, Vandewege, J, Qiu, X
In this paper we research an FPGA based Application Specific Instruction Set Processor (ASIP) tailored to the needs of a flow aware Ethernet access node. The processor has an architecture optimized...
High performance burst-mode upstream transmission for next generation PONs (invited paper) (2006)
Qiu, X, Yi, Y, Ossieur, P, Verschuere, S, Verhulst, D, De Mulder, B, ...
This paper presents the effective optical gain achieved with FEC in 1.25 Gbit/s GPON uplink yielding - 36 dBm burst-mode receiver sensitivity and 25 dB dynamic range. A low cost embedded fiber...
Embedded OTDR monitoring of the fiber plant behind the PON power splitter (2006)
Chen, W, De Mulder, B, Vandewege, J, Qiu, X
We present a laboratory prototype which verifies a novel embedded optical time-domain reflectometry 5OTSDR) approach. It integrates inexpensive fiber monitoring functionality into an optical network...
Progress in IST project PIEMAN towards a 10 Gbit/s, multi-wavelength long reach PON (2006)
Davey, R, De Ridder, T, Qiu, X, Ossieur, P, Krimmel, H, Smith, D, ...
Progress to date on the IST PIEMAN project (start date January 2006) to build a radically new photonic (all-optical) communication system is described.
Implementation of active noise control in a multi-modal spray dryer exhaust stack (2006)
Li, X., Qiu, X., Leclercq, Damien Joel Judicael, Zander, Anthony Charles, Hansen, Colin H.
Tonal noise emitted from large-diameter spray dryer exhaust stacks used in the dairy industry can give rise to complaints from nearby communities. In many cases, the tone at the fan blade passing...
Novel nanocomposite Pt/RuO2x H2O/carbon nanotube catalysts for direct methanol fuel cells (2006)
Cao, L., Scheiba, F., Roth, C., Schweiger, F., Cremers, C., Stimming, U., ...
Implementation of active noise control in a multi-modal spray dryer exhaust stack (2006)
Li, X., Qiu, X., Leclercq, Damien Joel Judicael, Zander, Anthony Charles, Hansen, Colin H.
Tonal noise emitted from large-diameter spray dryer exhaust stacks used in the dairy industry can give rise to complaints from nearby communities. In many cases, the tone at the fan blade passing...
A fast and intelligent automatic power control for a GPON burst-mode optical transmitter (2005)
Verhulst, D, Bauwelinck, J, Martens, Y, Qiu, X, Vandewege, J
A generic 1.25-Gb/s burst-mode optical transmitter with an intelligent automatic power control has been developed and tested successfully. The chip quickly adjusts the optical power during...
Bauwelinck, J, Chen, W, Verhulst, D, Martens, Y, Ossieur, P, Qiu, X, ...
An innovative burst-mode laser transmitter (BM-TX) is presented for gigabit-capable passive optical network (GPON) upstream transmission at 1.25 Gb/s. The laser bias and modulation current each can...
A 1.25-Gb/s burst-mode receiver for GPON applications (2005)
Ossieur, P, Verhulst, D, Martens, Y, Chen, W, Bauwelinck, J, Qiu, X, ...
This paper presents a 1.25-Gb/s burst-mode receiver (BMRx) for upstream transmission over gigabit passive optical networks (G-PONs). The dc-coupled receiver uses a unique arrangement of three...
Analysis of optimum avalanche gain of burst-mode receivers for PON applications (2005)
Ossieur, P, Qiu, X, Vandewege, J
We present optimum avalanche gains for burst-mode receivers (BMRx) for passive optical networks (PONs). The avalanche gain is optimized to maximize the geographical coverage of the PON, instead of...
A novel automotive VCSEL driver with feed-forward, bias and modulation current control (2005)
Yin, X, Verhulst, D, Bauwelinck, J, De Ridder, T, Ossieur, P, Qiu, X, ...
We propose a novel 50 Mb/s optical transmitter fabricated in 0.6 µm BiCMOS process for automotive applications. The proposed VCSEL driver chip was designed to operate from a single supply voltage...
De Ridder, T, Yin, X, Ossieur, P, Qiu, X, Vandewege, J, Chasles, O, ...
In this paper we present a study on the front-end of an optical receiver operating at 850 nm with a large integrated Si photodiode. The large photodiode implies a large capacitance. Combined with the...
An experimental set-up for the feasibility study of embedded optical fiber monitoring (2005)
Chen, W, De Mulder, B, Vandewege, J, Qiu, X, Bauwelinck, J, Van Renterghem, K
This paper introduces a new embedded optical fiber monitoring (OFM) technique to characterize the channel response of a passive optical network (PON). Embedded OFM aims to integrate a cost-effective...
Upstream experiments on the gigabit PON physical medium layer (2005)
Verhulst, D, Yi, Y, Qiu, X, Verschuere, S, Lou, Z, Ossieur, P, ...
First time demonstration of a high performance 1.25 Gbit/s GPON burst-mode uplink exceeding the ITU-T G.984 Recommendation and supporting Power Leveling Mechanism (PLM). A burst-mode receiver...
Applying effort constraints on adaptive feedforward control using the active set method (2003)
Xiaojun Qiu and Colin H. Hansen
Xiaojun Qiu and Colin H. Hansen
Active control of higher order duct modes propagating in a large exhaust stack (2003)
Li, X., Leclercq, Damien Joel Judicael, Qiu, X., Zander, Anthony Charles, Hansen, Colin H.
Xun Li, Damien J. J. Leclercq, Xiaojun Qiu, Anthony C. Zander and Colin H. Hansen
Applying effort constraints on adaptive feedforward control using the active set method (2003)
Xiaojun Qiu and Colin H. Hansen
Xiaojun Qiu and Colin H. Hansen
Active control of higher order duct modes propagating in a large exhaust stack (2003)
Li, X., Leclercq, Damien Joel Judicael, Qiu, X., Zander, Anthony Charles, Hansen, Colin H.
Xun Li, Damien J. J. Leclercq, Xiaojun Qiu, Anthony C. Zander and Colin H. Hansen
Active control of sound radiation from a small transformer using near-field sensing (2002)
Li, X., Qiu, X., Hansen, Colin H., Ai, Y.
Xun Li, Xiaojun Qiu and Colin H. Hansen
Vollmer, M. K., Weiss, R. F., Williams, R. T., Falkner, K. K., Qiu, X., Ralph, E. A., ...
The relationships between electrical conductivity, temperature, salinity, and density are studied for brackish Lake Issyk-Kul. These studies are based on a newly determined major ion composition,...
Experimental study of active control of high order acoustic modes in ducts (2002)
Li, X., Kestell, Colin David, Qiu, X., Zander, Anthony Charles, Hansen, Colin H.
The concept of virtual sensing in active noise control systems has shown promise as a method for producing a zone of attenuation at a location, remote from the actual error sensors, such as at an...
Robust design of active noise control system on a spray dryer exhaust (2002)
Qiu, X., Li, X., Leclercq, Damien Joel Judicael, Zander, Anthony Charles, Kestell, C. D., Hansen, Colin H.
Previous studies of active noise control systems [1, 2] have shown the effects that plant and disturbance uncertainties have on optimizing the locations of actuators and sensors. The effects of plant...
Perturbation signals for active noise and vibration control (2002)
Xiaojun Qiu and Colin H. Hansen
Active control of sound radiation from a small transformer using near-field sensing (2002)
Li, X., Qiu, X., Hansen, Colin H., Ai, Y.
Xun Li, Xiaojun Qiu and Colin H. Hansen