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Low-cost optical interconnects are playing an important role in sustaining the exponential growth in data center demand and to support the future internet-of-things cloud infrastructure. These chip-scale optical transceiver systems are integrated using two-chip bonding solution of CMOS electronic die with a silicon photonic die. In this work, modeling of the critical bond-wire is performed with electromagnetic...
We demonstrate a bandwidth and wavelength programmable silicon double microring optical filter that can be automatically, accurately, and repeatably set to an optimal Butterworth shape. The method automatically compensates for fabrication variations and thermal crosstalk.
We demonstrate a substrate-removed silicon Mach-Zehnder modulator with the 3-dB electro-optical bandwith beyond 50 GHz. Based on this modulator, 80 Gb/s on-off-keying and 50 Gbaud PAM-4 optical modulations are experimentally achieved without electrical pre-equlization.
Micron-scale disk resonators are explored to minituarize and enhance Ge-on-Si photodetectors. A 2.0 μm-radius detector exhibits a dark current of 11 nA, a responsitivity of 0.5 A/W and a 3-dB bandwidth of 17 GHz at −1V bias.
We report C-band waveguide-integrated GeSi electro-absorption modulators with 3dB-bandwidth beyond 50GHz. The DC extinction ratio is 4.2±0.3dB with 4.4±0.6dB insertion loss and the dynamic extinction ratio is 3.0dB at 50Gb/s NRZ-OOK with a 2 V swing.
We demonstrate a silicon-contact-only 56 Gbps germanium waveguide photodetector operating at −1 V. The dark current is below 4 nA and the responsivity is 0.74 A/W at 1550 nm and 0.93 A/W at 1310 nm.
Silicon RF power amplifiers (PAs) are in various RF front end modules (FEMs) today for handset and WLAN applications. Even though III-V semiconductor-based RF PAs can still offer superior frequency and breakdown performance with higher Pout and power-added-efficiency (PAE) and faster time-to-market, silicon-based RF PAs do have the advantages in offering higher monolithic integration with added functionalities...
According to the analysis of substrate integrated waveguide structure, a design of double-layer and seven-order MEMS bandpass filter using network synthesis is proposed in this paper. The simulation and optimization are explained with Ansoft HFSS. Based on MEMS technology, a millimeter-wave filter is designed with a center frequency at 30GHz, the 1dB bandwidth range is 690MHz, the passband return...
Planar chial meta-surface (PCM) is a class of meta-materials, consisted of a two dimensional surface grating with a chiral-shaped pattern in its unitcell. It has been reported that appropriate choice of film materials and the shape of chiral pattern made it possible to induce giant optical activity (polarization rotation) [1]. In this study we focused on Si/Si3N4/SiO2 PCM and investigated its potential...
To satisfy the ever-increasing transmission demands of optical communications, a polarization division multiplexing (PDM) offers an efficient solution in manipulating optical signals for photonic integrated circuits (PICs). In between, a polarization beam splitter (PBS), which can separate transverse-electric (TE) and transverse-magnetic (TM) modes, is most important devices for PDM and allows the...
The high power consumption and limited bandwidth of conventional metal interconnects has become the main obstacle to the extension of Moore's Law. Optics is the perfect solution because of its broad bandwidth, low latency, low power consumption, and low crosstalk. The hybrid III–V-on-Si platform has been developed extensively recently as a promising integrated platform to build robust Si-based light...
Ultra wide band system is a short-haul wireless communication with advantages of low power consumption, high data rate, resistance to interference, co-existence with narrowband systems and so on. A new-type ultra wide band antenna is proposed to solve the problems of miniaturization and integration. To realize on-chip system and combine with other functional microwave monolithic integrated circuits,...
■ Leverages Mali's scalable architecture ■ Scalable to 32 shader cores ■ Major shader core redesign ■ New scalar, clause-based ISA ■ New quad-based arithmetic units ■ New geometry data flow ■ Reduces memory bandwidth and footprint ■ Support for fine grain buffer sharing with the CPU
This article presents the dielectric waveguide based sub-THz interconnect channels for high bandwidth-density and high energy-efficiency chip-to-chip communications. Both far-field and near-field transition based channels are analyzed and demonstrated. The insertion losses of the interconnect with far-field transitions and near-field transitions are about 8.4 dB with 12.6 GHz 3-dB bandwidth and 4...
The mean shift algorithm shows a good performance in optical image segmentation. However, conventional mean shift algorithm performs poorly if it is used directly to synthetic aperture radar (SAR) image due to the large dynamic range and strong speckle noise. Recently, a generalized mean shift (GMS) algorithm with an adaptive variable asymmetric bandwidth was proposed for polarimetric SAR (PolSAR)...
A visible light photodiode with enhanced bandwidth is proposed in a CMOS compatible silicon on insulator platform. By depositing a thick oxide and a thin silicon nitride layer and proper patterning of nitride, collected power can be significantly enhanced.
In this paper, a contiguous carrier aggregation scheme for the downlink transmissions in an inband full-duplex cellular network is analyzed. In particular, we consider a scenario where the base station transmits over a wider bandwidth than the mobiles, while both parties are still using the same center frequency. As a result, the mobiles must cancel their own self-interference over a wider bandwidth,...
In order to cover a wide frequency band and meet the demand of multi-band, a microstrip antenna with some MEMS switches was designed by using the reconfigurable technology and fractal technology. Four MEMS switches were symmetrically loaded in the microstrip antenna. By controlling the states of the switches, the surface current distribution will be changed and then the operating frequency will be...
Recently, the rapid growth of optical-fiber communications systems that utilize baud rates up to 25 Gbit/s as represented by 100-Gbit/s Ethernet (100 GbE) has led to a resurgence of research on avalanche photodiodes (APDs) [1]. Two figures of merit for APD optical receivers are the excess noise factor and the gain-bandwidth product. Both are linked to the κ factor, which is the ratio of the electron,...
With increasing renewable penetrations and advancements in power electronics associated with smart grid technologies, distributed control of the power grid is quickly becoming a necessity. Once communications are introduced into a control system, the impacts of latency and unreliable communications quickly become a priority. Vector Lyapunov techniques are well suited for the analysis of control systems...
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