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Despite the high phase non-linearity of a Silicon Mach-Zehnder Modulator in forward bias, we demonstrate that high third order spur-free dynamic range ~102.8 dB. Hz2/3 can be obtained by optimizing the D.C. bias operating point at 1 GHz.
In the past several decades on-chip dimensions have scaled over 2000X, while dimensions on printed circuit board have scaled 4-5X. This modest scaling of packaging dimensions has severely limited system scaling. To address this, we have proposed a disruptive package-free integration scheme. We replace the traditional organic printed circuit board (PCB) with silicon interconnect fabric (SiIF) and replace...
Through silicon vias (TSVs) are arranged to form a rectangular resonant cavity to improve performance of silicon based antenna in this paper. On the basis of fundamental theory of rectangular resonant cavity, the model of cavity made of through silicon vias is analyzed. Considering the size of millimeter-wave antenna, the three dimensions of cavity for mode TE101 is calculated. Applying the resonant...
A silicon micromachined waveguide hybrid coupler for J-band (220–325 GHz) applications is presented. The coupling and phase shifting functions are realised using a 90° ridged waveguide phase shifter, a joint waveguide section and a port extension. The hybrid coupler is fabricated using a micromachined waveguide technology employing a double H-plane split that results in low losses. For the design...
In this paper antenna on silicon is presented. This paper proposes design of micro strip antenna on silicon with improved bandwidth. Proposed antenna is for X-band frequency. To improve bandwidth, ground defect being created on silicon substrate. With this we are improve bandwidth by 4–8 times. Designed verified both in HFSS simulation tool and on VNA after fabricating device.
InAlGaAs/InP p-i-n photodiodes epitaxially grown on silicon substrate with a dark current density as low as 1.3 mA/cm2 at −3 V are demonstrated. Responsivity, bandwidth, and output power at 1-dB compression are 0.76 A/W, 8 GHz, and −3.4 dBm, respectively.
In future radio access networks, radio-over-fiber links will be a key enabling technology. A link which is cost-effective in both deployment and operation will be of paramount importance to the development of such networks. Using silicon photonics for the transmitter and receiver is a cost-effective and high-performance solution. In this work we present a link which can transport up to 16 Gbps 16-QAM...
Bandwidth limitation of current wireless frequency bands and the energy consumption are challenges that have to be addressed by future 5G wireless networks. The millimeter wave (mm-wave) spectrum, spanning 30 GHz to 300 GHz, is a prime candidate to resolve the bandwidth limitation issue in future networks. High-speed electronics, though, are quite energy-inefficient for such mm-wave signal generation...
Low-threshold current and high-speed direct modulation features of membrane-based distributed-feedback (DFB) and distributed-reflector (DR) lasers will be presented. A power conversion efficiency of 12.5% was achieved with the DR laser by adopting a special design to reduce both the waveguide loss and the series resistance.
We present an ultra-broadband two-mode de/multiplexer based on a multimode interference coupler with sub-wavelength grating waveguides, a symmetric Y-junction and a 90° phase shifter. Numerical simulations show insertion losses below 0.18 dB and crosstalk lower than −20.6 dB in a 300 nm wavelength range.
The energy transduction of a Capacitive Micromachined Ultrasonic Transducer (CMUT) depends on the movement of a flexible plate, which has a low mechanical impedance compared to its bulky piezoelectric counterpart. Consequently, the output pressure of a CMUT is generally lower. This limits the penetration depth, and thus the visualization of deeper structures in the body, as well as non-linear imaging...
When on-chip interconnection network scales to integrate more processing elements, the average end-to-end latency is highly increased due to long average hop distance. Though it has been discovered that, almost of the communication in large scale networks is between nodes in a short range, it revealed that the small portion of data delivery between distant nodes consumes or occupies most of the network...
Recently, interest in contents utilizing 360 and Virtual Reality images is increasing. These images are generally transformed into Equirectangular projection and transmitted in a 2:1 ratio rectangular shape. However, this method causes distortion of the upper and lower parts of the 360 images which is widely spread. Furthermore, since the spread 360 images requires higher data rate, it is difficult...
We present a THz heterodyne detector based on a single layer graphene field effect transistor (GFET) integrated with a bowtie antenna at 400 GHz. The heterodyne detection is achieved by coupling RF and LO signals quasi-optically to the same GFET. The down converted IF signal is extracted via a coplanar stripline connected to the GFET source and drain terminals. The measured IF bandwidth is 5 GHz.
Thin silicon or glass interposer provide a way to highly integrated microsystems [1]. In this work, we present a novel wafer-level fabrication method of RF interposer applied in the integration of band pass filter in the frequency range of X band. In order to reduce the insertion loss caused by parasitic effects in the substrate, a special designed TSVs transmission structure (a core TSV and six shielding...
A fully-electronic high-speed transmission with a highly-integrated set of quadrature direct-conversion TX and RX modules in 130nm SiGe HBT technology operating in the 240 GHz transmission window is presented. In view of high packaging costs of the currently available THz communication front-ends, each of the modules is implemented as a single chip with a broadband silicon lens-integrated on-chip...
We present high-performance Bragg filters based on Si sub-wavelength engineering. We demonstrated a novel differential configuration approach that relaxes fabrication constraints. Single-etch filters with corrugation widths of 150 nm allowed measured wavelength rejection exceeding 40 dB with narrow bandwidths as low as 1.1 nm.
In general, current wireless system, either for area networks or point-to-point links, cannot transmit and receive signals in both directions in the same frequency band and at the same time because of the extremely high self-interference, which annihilates the desired signal, making the use of half-duplex methods strictly necessary. In order to achieve full-duplex wireless communications, it is crucial...
We present a novel suspended Si waveguide approach for hybrid near-infrared and mid-infrared operation. Large waveguide cross-sections allow mid-infrared propagation, while an original corrugation yields effective single-mode near-infrared operation. Exploiting this concept, we demonstrated Bragg filters with 4 nm bandwidth and 40 dB rejection.
Three Ge-on-Si photodetector architectures with different contacting schemes are compared, with emphasis on their bandwidth. The study shows that bandwidth > 50 GHz and responsivity > 1 A/W at 1490 nm can be achieved using a commercial silicon photonics process.
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