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A 4-nm large Si-QD doped SiOx rib waveguide based optical absorption modulator with free-carrier density dependent relaxation lifetime is demonstrated. The switching response is shortened to 9 µs by reducing pumping duty-cycle to 0.5 µs.
We present results for FEOL integration of Silicon electro-optic waveguides with high-performance BiCMOS technology. The new technology allows for dense co-integration of high-speed analogue RF circuits and Silicon modulators.
Current flash memory technology is focused on cost minimization of the stored capacity. However, the resulting approach supports a relatively small number of write-erase cycles. This technology is effective for consumer devices (smart-phones and cameras) where the number of write-erase cycles is small, however, it is not economical for enterprise storage systems that require a large number of lifetime...
This paper deals with objective criteria to compare conventional electric traction systems composed of a DC-DC boost converter, a Voltage Source Inverter and of a Permanent Magnet Synchronous Machine with alternative topologies such as the Z-source or Quasi Z-source inverters. Analytical expressions are given and validated by both simulation and experimental results (efficiency).
Silicon modulators are maturing and it is anticipated that they are going to substitute state-of-the art modulators. We review current silicon modulator approaches and then discuss the silicon-organic hybrid (SOH) approach in more detail. The SOH approach has recently enabled the operation with an energy consumption of 60 fJ/bit and demonstrated the generation of up to 112 Gbit/s per polarization...
The introduction of advanced optical modulation formats for coherent data transmission and multilevel signalling enlarges the transmission capacities but also requires more complex opto-electronic components. The need for cost efficient compact solutions is the main driver for photonic-electronic integration technologies. In the framework of the European Project GALACTICO a new mixed technology platform...
In this work we review the results obtained under the framework of FP7-HELIOS project for integrated DQPSK transceivers in silicon photonics. A differential DQPSK receiver with balanced zero biased Germanium photodiodes has been demonstrated at 10Gbit/s with an error floor around 10−15. Furthermore, DPSK modulation up to 10Gbit/s with a bit error rate below 10−9 is also demonstrated using a silicon...
Silicon photonics has generated a strong interest in recent years, mainly for optical telecommunications and optical interconnects in microelectronic circuits. The main rationales of silicon photonics are the reduction of photonic system costs and the increase of the number of functionalities on the same integrated chip by combining photonics and electronics. In the group IV materials, germanium (Ge)...
The paper presents a VHDL-AMS based approach to the Switched-Current (SI) Sigma-Delta Modulator design. EDA tools are presented, which translate the prototype VHDL-AMS description into SI realization. Another tool helps the designer to create the layout. The paper also describes a new proposed current mode comparator, which is used in the design. Postlayout simulation results are presented.
We demonstrate low-driving power silicon microring Mach-Zehnder modulators (MZMs) driven by thermo-optic effect. The multiple-wavelength modulation is realized using a cascaded microring MZM. The driving voltage is reduced up-to 1/6 in a push-pull microring MZM.
We demonstrate a coherent modulator and a receiver based on monolithically-integrated silicon photonic circuits, capable of modulating and detecting 224-Gb/s polarization-division-multiplexed 16-QAM. The high-degree photonic integration promises small-form-factor and low-power transceivers for future coherent systems.
Modulation with 7.5dB transmitter penalty is demonstrated from a novel 1.5Vpp differential CMOS driver flip-chip integrated with a Si ring modulator, consuming 350fJ/bit from a single 1V supply at bit rates up to 10Gb/s.
As the component count rises in photonic systems, photonic integration becomes increasingly attractive from a cost, power consumption, and footprint perspective due to the ability to reduce the on-chip to off-chip interfaces and simplify packaging. Although photonic integration has been investigated in many forms over the last decade, the incompatibility of passive and active devices in standard integration...
High-capacity transmission in a 100 m SI POF is reported. This was enabled by multilevel CAP modulation and digital equalization techniques. The influence of multilevel coding and equalization penalties are discussed.
We experimentally demonstrate ultracompact Si electro-optic modulators based on horizontal Cu-insulator-Si-insulator-Cu nanoplasmonic waveguides on SOI substrates using standard CMOS technology. A modulator with 1-μm-long phase shifter exhibits 9-dB extinction ratio under 6-V/10-kHz voltage swing.
We describe components we developed in addressing several challenges in silicon photonics, including fiber coupling, demultiplexing, and polarization diversity. We then summarize several circuit examples for WDM transmitter / receiver and optical switch.
A four-wavelength Si/III-V hybrid laser array was developed for energy-efficient silicon photonics CWDM transmitter. Under 4-ch simultaneous operation, stable lasing oscillations at four neighboring ring-resonator peaks are obtained with high output powers of >+5dBm/ch.
An integrated silicon photodiode and heater are used to thermally stabilize a microring modulator, interfacing with external feedback circuitry to provide error-free microring modulator operation under thermal fluctuations that would normally render it inoperable.
Width-modulated silicon waveguide is investigated as a means of quasi-phase-matching to enhance the bandwidth of wavelength conversion based on four-wave-mixing. A conversion bandwidth enhancement of ~40% is achievable in a 5mm sinusoidally modulated SOI waveguide.
This demo will show a novel method of Selftuning technique suitable for digitally controlled Switching Mode Power Supplies (SMPS). Perturbations can be added in order to stimulate loop reaction, which mainly contains load information. Variations on the Power Supply output filter, can be monitored and regulation gains can be consequently set for reaching a well compensated closed loop condition. The...
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