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We fabricated counter-doped ring resonator modulators that guarantee the absence of unexpected p-i-n junctions in the ring waveguide due to overlay misalignments inherent to successive lithographic steps. Fabricated ring resonator modulators showed good efficiency (VπL at 1.55 V.cm at −1V) and transmission at 10 Gb.s−1.
A 2D integrating cell waveguide platform is presented where ultra-long optical path lengths in a small area are realized by multiple reflections of a guided signal at PhC boundaries. In experiments, path lengths of 25 cm are demonstrated in integrating cells with 1.8 mm radius.
We demonstrate low-loss mid infrared photonic integrated components fabricated on a Ge-rich Si1−xGex platform. These devices show broadband operation over a wavelength range of at least from λ ≈ 5.1 μm to λ ≈ 8.6 μm, and comprise waveguides, multimode interference couplers and Mach-Zehnder interferometers.
A method is proposed for locking the resonance of a high-bandwidth, silicon micro-ring modulator using intrinsic-defect-mediated-photon-absorption. The photo-signal is generated by the modulator, and thus the need for a waveguide tap is negated. A digital PID loop is used for stabilization.
We demonstrate a silicon PAM-4 optical modulator which is driven by two uncorrelated binary electrical signals with different peak-to-peak voltages. The device can work at 32 Gbaud in the wavelength range from 1525 nm to 1565 nm.
Germanium-on-silicon rib waveguides are modelled, fabricated and characterized with a novel near-field infrared spectroscopy technique that allows on-chip investigation of the waveguide losses at 5.8 μm wavelength.
We propose a silicon 2×2 optical switch which can simultaneous manipulate wavelength division multiplexing and mode division multiplexing signals. It is composed of broadband mode multiplexers, demultiplexers and single mode optical switch elements. For demonstration, we design and fabricate a prototype device using asymmetric directional coupler and Mach-Zehnder optical switch elements which can...
We propose an ultra-compact solid-state auto-correlator fabricated by Si photonics technology. The correlation waveform is obtained by detecting the overlap of two slow-light pulses counter-propagating in a photonic crystal waveguide integrated with two-photon absorption photodiode array. Since the device does not need a mechanical delay scanner, the full integration on a silicon-on-insulator, easy...
We demonstrate a single-drive parallel-push-pull silicon optical modulator. When optically biased at the quadrature point, the device has an extinction ratio of 3.1 dB at the speed of 20 Gbps and under the driving voltage of 1.8 Vpp.
Considering a Ge-on-Si waveguide p-i-n photodetector structure inspired by the literature, we have investigated the role of the detector geometry on its electrical and optical (O/E) bandwidth. Due to the structural complexity of the detector, three-dimensional coupled optical and electrical simulations were needed to implement an accurate model. To make an extensive 3D optimization study possible...
We demonstrate high-speed operation of ultracompact electroabsorption modulators based on epsilon-near-zero confinement in indium oxide (In2O3) on silicon using field-effect carrier density tuning. Additionally, we discuss strategies to enhance modulator performance and reduce confinement-related losses by introducing high-mobility conducting oxides such as cadmium oxide (CdO).
For the near-infrared (near-IR) optical data communications, silicon photonics became a mature technology. Building on the technological developments associated with datacoms, silicon photonics now expands into the mid-infrared (mid-IR), mostly for the optical gas sensing. Here as well, the development is hampered by the absence of monolithically integrated laser sources compatible with the CMOS fab...
In this work, we demonstrate an integrated electronic-photonic platform in a standard 65 nm microelectronic CMOS 300 mm foundry. Alongside electronics, we monolithically integrate silicon avalanche photodiodes and optical waveguides that operate from violet to NIR through a mask-less post-CMOS-compatible fabrication process.
A monolithic integrated photonic platform is essentially required for a broad range of applications, including optical interconnect, quantum information processing, lighting, display, and sensing. To date, however, a ubiquitous platform for photonic integration has remained elusive. While Si photonics has been extensively studied, it has several serious shortcomings [1], including optical absorption...
Methylammonium lead halide perovskites (MAPbX3, where X = I, Cl, and Br) have come in the spotlight as alternative devices of silicon for next-generation solar cells owing to its extraordinary photovoltaic property, ease of fabrication, and low cost, which has exhibited power conversion efficiencies of up to 20.5% [1]. In addition, perovskites have recently shown the further application in optically-controllable...
In this work, we report the micro fabrication of several types of resonant micro magnetic field sensors where we can use an optical technique to read the magnetic variations (MOEMS). The fabrication process we have used, is a simple process in a SOI wafer with 6 μm of active layer and 5 μm of sacrificial SiO2.
The intrinsic properties of silicon (Si) make it an excellent material for integrated photonics devices with small footprints [1]. To date, most of the reported devices have been based on crystalline silicon (c-Si), but this material suffers from difficult integration with electronic layers due to fabrication constraints. Subsequently, there has been growing interest in alternative forms of Si, such...
Polycrystalline silicon (poly-Si) has attracted significant interest in the area of silicon photonics because of its potential for combining good optical transmission, electronic functionality and low fabrication cost, which makes it an attractive material for commercial applications [1]. In addition, it was shown recently that by laser processing of amorphous Si (a-Si) it is possible to obtain very...
In past years the global demand for energy has been increasing steeply, as well as the awareness that new sources of clean energy are essential. Photo-electrochemical devices (PEC) for water splitting applications have stirred great interest, and different approach has been explored to improve the efficiency of these devices and to avoid optical losses at the interfaces with water. These include engineering...
Metamaterials and metasurfaces are artificial structures whose optical properties go beyond the natural behaviour of light. Their appeal revolves around the possibility to design the optical response by changing the geometry of the structure using essentially the same material constituents [1]. Some classes of metamaterials and metasurfaces can be fabricated over macroscopic areas and have strong...
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