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VCSEL bandwidth is limited by slow e-h recombination lifetime nanosecond to ∼ 30 GHz (60Gb/s). The transistor laser (TL) has picosecond radiative recombination lifetime; thus, it will have modulation bandwidth higher than VCSELs toward 150 GHz to achieve 300 Gb/s error free transmission and low power operation of energy/bit toward 10 fJ/bit.
We demonstrate InP-based modified uni-traveling carrier (MUTC) photodiodes (PDs) with top p-contact on silicon-on-insulator (SOI) nano-waveguides. The photodiodes have a low dark current of 10 nA, high internal responsivity of 0.84 A/W and bandwidths up to 35 GHz.
50 Gb/s error-free data transmission and a −3-dB modulation bandwidth of 28.2 GHz are reported for high speed 850 nm oxide-confined VCSELs fabricated with an as-grown epitaxial structure without post-fabrication tuning of the photon lifetime.
An integrated design of a band-pass filter and a patch antenna is proposed in this paper by using an aperture coupled structure. Traditionally, the microwave filter and antenna are designed separately using 50 Ohm interface and then connected by transmission lines, which lead to a large size and more loss. Here, the antenna and microwave filter are directly integrated without a 50 Ohm interface between...
Some of intriguing advantages of Rogowski coils, such as high bandwidth, capability of measuring large currents, non-saturation and potential-free, make it possible to detect and diagnose large pulsed current from an electromagnetic launch system. In this paper, high frequency behavior for a Rogowski coil is analyzed. Considering the model of the coil frequency response, a design method for the transducer...
Traditional microwave absorbers are typically made of ferrite powders and/or ferromagnetic metal powders and rely on ferromagnetic relaxation in the powders [1]. These absorbers can show strong absorption over a relatively wide frequency range if the thickness is sufficiently large, and for a given absorption level the frequency bandwidth usually decreases with a reduction in the thickness. One can...
A new type of dual-band ESPAR (Electronically Steerable Parasitic Array Radiator) array antenna is presented. The antenna consists of one feeding radiating element and two-layer parasitic radiating elements. The parasitic radiating element of each layer is composed of 6 parasitic monopoles and placed in the near field of the active radiator. Replacing the reactance-load, the on/off controlling is...
A printed dipole antenna with broad band is proposed for modern wireless communication systems, which sufficiently covers the DCS, PCS, TD-SCDMA (A + B + C), and WLAN bands. The antenna has two tapered arms fed by an integrated balun, leading to a broad impedance bandwidth. Moreover, triangular-shaped grounds are designed for the antenna, which improves the impedance bandwidth effectively. A prototype...
Major efforts are currently underway throughout the IC industry to develop the capability to integrate device chips by stacking them vertically and using through-silicon vias (TSVs). The resulting interconnect density, bandwidth, and compactness achievable by TSV technology exceed what is currently possible by other packaging approaches. Market-driven applications of TSV involving memory include multi-chip...
Large-scale distribution, communication and processing of sensed information require the operation of a highly-dynamic, dense, and widely-distributed wireless sensor network. Existing centralized and decentralized solutions require the use of information that may not be readily available to the nodes in a timely fashion. Instead of seeking such techniques, in this paper we propose an evolutionary...
In this paper, we consider randomized distributed cooperation for multicasting a source signal with end-to-end distortion used as a performance metric. In order to provide differentiated quality to users with different channel strengths, we study layered cooperation where layers are transmitted simultaneously using superposition coding. We first formulate the problem and investigate the effect of...
In this paper, a single-chip linear CMOS power amplifier (PA) with sufficient power and linearity for emerging OFDM-based applications is reported. This 90 nm fully-integrated PA adopts a differential topology and operates at 3.3 V supply.
We present the first analysis of wideband-stimulated emission in semiconductor quantum-dot laser. Our theoretical model reveals critical occurrence of broadband lasing when the energy spacing between quantized energy states (DeltaE) is comparable to dot inhomogeneity.
This paper investigates the necessary bandwidth for the instruments composing a measuring bench intended to linearize power amplifiers using adaptive digital predistortion. We show that the higher the bandwidth is, the better the predistortion is. Conversely, if the instruments bandwidth is not sufficiently large, the results with predistortion are worse than the results without linearization.
Autonomous system with DC-AC converter as an interface from the battery source to the inverter load easily suffers from voltage ripples on the DC-bus at the twice load frequency (100 Hz). A fast voltage controller for tightly regulating the DC-bus voltage with the inevitable 100 Hz ripples bears a rapid transient response, however always contaminating battery current with large ripples at 100 Hz,...
We demonstrate tunable dispersion compensation in a 4times40-Gb/s system using sampled NC-FBGs with negligible errors from dispersion slope. The tuning ranges are 400 ps/nm for a single FBG and 600 ps/nm for a twin cascaded-inverse FBG configuration
We demonstrate tunable dispersion slope compensation for 40-Gb/s WDM systems using two inverse 3rd-order chirped gratings. The inherent errors in a single grating are eliminated. The slope range is -20 to +20 ps/nm2over a 5-nm bandwidth.
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