A small silicon mode (de)multiplexer with cascaded asymmetrical directional couplers is demonstrated experimentally. As an example, a four channel designed and realized for TM polarization. The fabricated has low excess loss (<1 dB) as well crosstalk (≤23 over broad wavelength range (~20 nm). More channels can be achieved two sets of orthogonal-polarization modes (e.g., 2N=8) multiplexed when desired.

Abstract An 8‐channel hybrid (de)multiplexer to simultaneously achieve mode‐ and polarization‐division‐(de)multiplexing is proposed demonstrated experimentally on a silicon‐on‐insulator platform improve the link capacity of an on‐chip optical interconnect. The present has four channels for each polarization. A polarization beam splitter based three‐waveguide coupler used combine/separate fundamental modes TE‐ TM‐polarizations (TE 0 TM ). Six asymmetric directional couplers are cascaded...

An improved 8-channel silicon mode demultiplexer is realized with TE-type and TM-type grating polarizers at the output ends, these gratings serve as fiber-chip couplers simultaneously. The present includes a three-waveguide PBS (for separating TE0 TM0 modes) six cascaded ADCs demultiplexing high-order modes of both polarizations). high extinction ratios are used to filter out polarization crosstalk in hybrid multiplexer efficiently measured for all mode-channels reduced greatly ~-20dB ~100nm...

A compact 64-channel hybrid demultiplexer based on silicon-on-insulator nanowires is proposed and demonstrated experimentally to enable wavelength-division-multiplexing mode-division-multiplexing simultaneously in order realize an ultra-large capacity on-chip optical-interconnect link. The present consists of a 4-channel mode multiplexer constructed with cascaded asymmetrical directional-couplers two bi-directional 17 × arrayed-waveguide gratings (AWGs) 16 channels. Here each AWG equivalent...

An ultra-short (∼10 μm long) polarization beam splitter (PBS) based on an asymmetrical bent directional coupler (DC) is demonstrated experimentally by using silicon-on-insulator nanowires. The DC designed to cross-couple TM polarized light completely while there almost no coupling for TE polarization. Grating couplers are introduced at both ends of the PBS efficient single-mode fibers. measurement results show that extinction ratios fabricated higher than 10 dB polarizations in a broad...

A compact low-crosstalk multi-ring fiber transmitting multiple orbital angular momentum (OAM) modes is presented. The multi-OAM-mode (MOMRF) consists of 7 rings, each supporting 22 with 18 OAM ones (i.e., 154 channels in total), which can be used for high-density space-division multiplexing. employed high-contrast-index ring structure benefits tight light confinement and large effective refractive index difference different , featuring both low-level inter-ring crosstalk ( 30 dB a...

Multimode spatial-division multiplexing (SDM) technology has attracted much attention for its potential to enhance the capacity of an optical-interconnect link with a single wavelength carrier.For mode-multiplexed link, functional elements are quite different from conventional ones as multiple modes involved.In this paper we give review and discussion on multimode photonic integrated devices opticalinterconnects.Light propagation mode conversion in tapered waveguides well bent discussed...

A monolithically integrated 64-channel hybrid demultiplexer on silicon is demonstrated experimentally to enable wavelength-division-multiplexing and mode-division-multiplexing simultaneously for realizing an ultra-large capacity optical-interconnect link. The present consists of a four-channel mode multiplexer realized with three cascaded asymmetrical directional-couplers four identical arrayed-waveguide gratings (AWGs) 16 channels. For the fabricated multiplexer, excess loss crosstalk are...

A compact wavelength-division (de)multiplexer is proposed and demonstrated experimentally to achieve doubled channel number halved spacing by utilizing a bidirectional arrayed-waveguide grating integrated with an Mach-Zehnder interferometer optical interleaver. As example, 18-channel of 200 GHz designed fabricated. The measured excess loss about 8 dB the crosstalk -15 ~ -18 dB. footprint this fabricated 520 μm × 190 μm.

Novel evanescently coupled waveguide modified uni-traveling carrier photodiodes (MUTC-PDs) employing a thick multi-layer coupling are reported. To improve the optical-to-electrical (O/E) conversion efficiency, with gradually increased refractive index from bottom layer to absorption is utilized. The profile facilitates upward transmission of incident light into region, thereby enhancing evanescent efficiency. Meanwhile, waveguide, total thickness 1.75 µm, expands mode field diameter,...

The use of cellulose for various value-added chemicals is a promising alternative to fossil resources reduce their dependence and depletion. selective conversion 5-hydroxymethylfurfural (5-HMF) an attractive depolymerization route with great application, which often meets the hindrance tough structure, inert activity, big barriers in mass transfer. To achieve high efficiency green cellulose, heterogeneous Pickering interfacial catalysts (PICs) containing polyoxometalates (POMs) had been...

The existing research outputs paid less attention to the relationship between land use and passenger demand, while taxi drivers’ searching behavior for different lengths of observation period has not been explored. This paper is based on GPS trajectories data from Shenzhen explore driver’s operation passengers’ demand. covers 204 hours in Shenzhen, China, which includes license number, time, longitude, latitude, speed, whether passengers are vehicle, track passenger’s pick-up drop-off...

This letter reports our recent results on the high-speed silicon-waveguided germanium junction-field-effect-transistor (JFET)-based photodetector. Although Ge layer's footprint wafer is as small 2 μm × μm, low standby current (0.5 μA at 1 V), high responsivity (642 mA/W), and speed (8 GHz) are achieved. The reported JFET a promising solution for photodetector's further scaling-down.

Orienteering problem is gradually prevalent in the recent decade, but studies considering both uncertainty and multiobjective are still at low pace. In this paper, uncertain orienteering (UMOOP) modeled based on theory, which objective functions contain vectors. Firstly, Kataoka criterion 'worst-case-oriented' philosophy adopted, UMOOP transformed into a deterministic α-UMOOP with series of chance constrains. On basis, concept efficient solution belief degree defined. Secondly, two...

Entropy transfer in metal halide perovskites, characterized by significant lattice anharmonicity and low stiffness, underlies the remarkable properties observed their optoelectronic applications, ranging from solar cells to lasers. The conventional view of this involves stochastic processes occurring within a thermal bath phonons, where arrangement energy flow higher lower frequency modes. Here we unveil comprehensive chronological sequence detailing conceptually distinct, coherent entropy...

Based on the trap model, band structure and conductive mechanism of polysilicon were analyzed, then an equivalent circuit used to interpret tunneling piezoresistive effect was proposed. Synthesizing grain boundary region neutral zone, a new model—a model is established. The results show that when doping concentration above 10 20 cm 3 , coefficient higher than it increases with increase in concentration. This reveals intrinsic important experimental phenomena gauge factor heavily doped nano-films

A polarization beam splitter with cascaded asymmetrical directional couplers is demonstrated experimentally on a silicon-on-insulator (SOI) platform. The measured extinction ratios of the fabricated PBS are about 11dB and 13dB for TE/TM polarizations.

Modulation properties of terahertz waves going through a light excited high resistivity silicon wafer are analyzed and measured.Free carrier lifetime the affects modulation depth speed wave.The is reduced to less than 1 µs by thermal processing for modulation.Experimental results show that response time proposed modulating structure close 51%, respectively.

In the medical field and biotechnology application, a new type of HSTOS (human scale tel-operating system) used to carry out three-dimensional high-speed micromanipulation is demanded urgently. this paper, we deal with HSTOS. order operate microobject in human (the working table or micromanipulator) multi-DOFs, macro/micro mechanism system proposed. Firstly, design precision parallel micromechanism 6 DOFs, 10 mum moving range, 6-14 nm resolving power that has been reported, complex control...

Abstract A combination of UV–vis, HPLC, and NMR methods was used to identify isomers mono- disulfonic phthalocyaninatozinc, which provides a good reference for isomer research such compounds.