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Optical modulators are central to a large number of applications in photonics particularly in the area of communication as they provide the function of writing electrical data onto an optical carrier. Silicon photonics provides a route to the realisation of low cost photonic integrated circuits through fabrication which is synonymous with CMOS electronic fabrication, i.e., high volume and high yield...
Thermo-optic effect plays an important role and has been paid intensive attention for realizing switchable/tunable photonic integrated devices. In particular, it is possible to realize energy-efficient thermally switchable/tunable photonic integrated devices on silicon because of the high thermo-optical coefficient of silicon material. Recently we realized silicon-based ultra-broadband low-loss thermo-optic...
A low insertion loss asymmetric slot waveguide based silicon polarizing beam splitter is designed and fabricated, without adopting any strip-slot mode converter. The splitter can realize a TM light cross-coupling with a strip waveguide, while little TE light coupling can happen.
The waveguide is the most fundamental component of integrated photonic circuits. We observe that roughness-induced backscattering in high-contrast silicon waveguides generates over 10 dB spectral transmission variations in centimeter-long silicon waveguides.
Understanding how simple biological entities perform complex tasks (such as moving away from predators, reproduction and seeking for food) is one of the main goals of researchers across the world. The C. elegans nematode is one of the simplest and well characterised biological nervous systems (BNS) and the Si elegans EU FP7 project aims to develop a framework to mimic its functionality and better...
In this communication, we present strategies to implement novel or enhanced optoelectronic functionalities on silicon via the monolithic integration of functional oxides as active layers for nanophotonic devices. We focus on the use of ferroelectric oxides with naturally strong electro-optical coefficients such as BaTiO3 (BTO) on SOI for the realization of electro-optical modulators around 1.55 µm...
An electromagnetic wavelength-scale numerical analysis of optical characteristics of multinanolayer photovoltaic (PV) cells based on Si p-i-n type absorber with non-periodic (chirped) distributed Bragg reflector (DBR) on the top of the structure mounted on a metallic layer and SiO2 substrate is performed. Computer modelling of absorbing, reflecting and transmitting characteristics of multinanolayer...
In this paper, we propose a novel method to experimentally determine the linear absorption coefficient (LAC) of graphene-silicon hybrid waveguides (GSHWs) by a symmetrical add-drop silicon microring resonator. Experimental results show that the LAC of a GSHW has an average value of 0.23 dB/µm. Our approach does not depend on the fiber coupling, waveguide end facets etc. and thus, is promising for...
We experimentally demonstrate topologically protected optical waveguiding in silicon at the interface between two topologically distinct dimer chains. Further, we propose and demonstrate beating between topological and trivial defect modes.
High-speed optical wireless communications have been widely studied, and the infrared wavelength is a good option for short-range high-speed applications. In this paper, infrared short-range optical wireless systems and the silicon integration of beam steering function are discussed.
Semiconductor nanoparticles, supporting electric and magnetic optical resonances, are promising basic elements for a number of linear and nonlinear optical applications. Here we study elastic and inelastic (Raman) light scattering on crystalline silicon nanoparticles and reveal their interrelations for both s- and p-polarized light. We demonstrate experimentally a 2-fold enhancement of Raman signal...
In this paper, we investigate the curvature effects on the electronic band structure and dielectric function of single-walled silicon nanotubes based on tight-binding method. The curvature nature of nanotubes causes radius-dependent σ-π-orbital hybridization which leads to optimization of tight-binding model for each radii. First, the effects of orbitals overlap and the structural optimization on...
In this paper, we demonstrate a way of packaging CMOS ICs and optoelectronics, which has been achieved by using a deeply wet etched silicon interposer. The silicon interposer concept is used for the assembly of electronics (drivers, TIAs), photonics (VCSELs, PDs) and mechanical optical interface (MOI) and can be fabricated on full wafers. Only four steps of lithography are needed to fabricate the...
We present a silicon photonics optical I/O interfacing solution based on adiabatic optical coupling between silicon waveguides in a silicon photonics chip and polymer waveguides. Three different assembly methods were investigated for the evaluation of the coupling loss. A coupling loss as low as 0.9 dB was found at 1310 nm.
Silicon photonics enables new pinnacles of large-scale photonic integration, aiming at the need for large bandwidth in next-generation data centers and interconnects systems. Ultra-high data streams are thus required in the smallest footprint using the lowest amount of power possible. On the silicon-on-insulator platform, microring modulators are a promising solution providing desirable compactness...
Ultra-high data rate is required for future cloud computing and interconnects systems, for which integrated optical transceivers provide promising solutions. We report 66 Gb/s, on-off keying (OOK) operation of a silicon microring modulator (MRM) consuming a low power of 15 fJ/bit. To the best of our knowledge, this result features the fastest binary shift keying operation using a MRM.
Silicon photonics technology emerged as a promising solution to address the technical challenges related to 100 Gb/s and 400 Gb/s optical link. Enabling the development of silicon photonics products requires the development of optical passive libraries integrated within conventional CAD tools used in the CMOS design flow. The optimization and modeling of silicon photonics optical passive is therefore...
A chip-scale package structure for Si photonic optical transceivers has been developed. The foot print of the transceiver is 5 mm × 5mm. By using an optical pin array and glass interposer with through-glass vias (TGVs), high density optical and electrical I/O interfaces are configured on one side of the package. The optical pin acts as a vertical waveguide or spot-size converter (SSC). The combination...
This talk describes the theory and implementation of dynamically biased APDs for nulling the avalanche buildup time in direct-detection optical communications. The technique is applicable to any APD and can enable operation at data rates that exceed the traditional limits dictated by the gain-bandwidth product associated with statically biased APDs.
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