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- 实验方案
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On-chip Optical Vector Quadrature De-multiplexer Proposal for QAM De-aggregation by Single Bi-directional SOA-based Phase-sensitive Amplifier
摘要： In this paper, a simple optical vector quadrature de-multiplexer (QD) scheme is proposed for de-aggregating input 10 Gbaud 16/32/64 quadrature amplitude modulation (QAM) signals into two pulse amplitude modulation (PAM) streams. The proposed QD is based on a single bi-directional degenerate phase-sensitive amplifier (PSA), where the wavelength and the polarization status of the extracted in-phase and quadrature components stay the same as the input signal. Since the proposed QD is realized using PSA based on semiconductor optical amplifier (SOA), it is also possible to realize an on-chip QD system, providing an integrated platform for optical signal processing. Through numerical simulation, the transfer characteristics of the proposed QD system show that the SOA-based PSA has a high phase-sensitive gain extinction ratio of 44.1 dB. The constellations, error vector magnitudes (EVMs), and bit-error rates (BERs) of the data streams after the de-aggregation are numerically investigated to verify the proposed QD scheme. For the 10 Gbaud 16/32/64 QAM signals with an input optical signal-to-noise ratio (OSNR) of 25 dB, the de-aggregated PAM4/PAM6/PAM8 signals show 6.1, 5.6, and 8.2 dB receiver OSNR improvements at the BER of 10?3, respectively. Also, to optimize the performance of the subsystem, the BER performance dependence on the phase difference between two arms in the subsystem is also examined. The simulation results reveal that the proposed QD can accomplish the function of optical vector de-aggregation well for the high-level QAM signals. The proposed QD can be applied to information de-aggregation, format conversion, and direct detection for optical vector signals, which may have great potential values for the flexible optical networks.
关键词： Optical fiber communication,semiconductor optical amplifiers,nonlinear optical devices,optical signal processing
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Manipulation of EM Waves Using Graphene
摘要： This paper briefly reviews our group’s partly progresses in graphene applications in electronic and optical devices. Several examples will be presented, such as electromagnetic black hole, flexible transformation plasmonics, tunable substrate-integrated-waveguide attenuator and electro-optic modulators, and so on. We hope that these theoretical and experimental verifications can further demonstrate the versatility of graphene, and move graphene a step further into the actual applications.
关键词： optical devices,graphene,electronic devices
更新于2025-09-23 15:22:29
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MZI-Based All-Optical Modulator Using MXene Ti <sub/>3</sub> C <sub/>2</sub> T <i> <sub/>x</sub></i> (T = F, O, or OH) Deposited Microfiber
摘要： As a new class of 2D materials, MXenes have attracted a lot of interest because of their prominent performance in versatile applications, such as batteries, supercapacitors, catalysts, electronics, and optics. In this work, an all-optical modulator using MXene Ti3C2Tx deposited on a microfiber is proposed. By inserting an MXene-deposited phase shifter into one arm of a Mach–Zehnder interferometer, the MXene Ti3C2Tx absorbs the control light and generates heat, which induces significant refractive index changes through strong light–matter interactions and thermo-optic effects. In this study, a maximum phase shift of 16π is obtained, and an efficient all-optical switch with an extinction ratio of more than 18.53 dB and a rise time constant of 4.10 ms are demonstrated. The advantages of this modulator include its all-fiber content, low cost, ease of integration, and compactness. All-optical modulators based on thermo-optical effects will play an active role in the future of optical communications and optical information processing.
关键词： thermo-optical effect,Mach–Zehnder interferometer,all-optical devices,MXene Ti3C2Tx,nanomaterials
更新于2025-09-23 15:22:29
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Boronic ester-based dynamic covalent ionic liquid gels for self-healable, recyclable and malleable optical devices
摘要： Dynamic covalent ionic liquid (IL) gels have been proved to be promising materials for soft optical devices which possess the advantages of other dynamic gels but avoid shrinking. The focal length of the planoconvex lens made from the gels is tunable and the prism from them shows an excellent beam splitting property. Damaged devices could be re-covered via self-healing or re-molding.
关键词： malleable optical devices,recyclable,Boronic ester,dynamic covalent ionic liquid gels,self-healable
更新于2025-09-23 15:21:21
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Meniscus Shape Control Using Electrowetting and Its Application to Optical Devices
摘要： Electrowetting is a technique to modify wettability and meniscus shapes on electrodes by applying voltage to the electrodes. In the present article, we introduce principles of electrowetting deriving the equation connecting voltage and contact angle. Then we reviews related articles on optical devices using electrowetting including our previous works; a liquid prism controlling optic-axis using electrowetting. Numerical simulation solved meniscus shapes between each liquid to predict the relation between applied voltage and optic angle. Results in experiments and simulations are briefly reported.
关键词： Meniscus,Electrowetting,Numerical simulation,Optical devices,Wetting
更新于2025-09-23 15:21:21
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Edge mode graphene plasmons based all-optical logic gates
摘要： Graphene plasmonic logic gates (GPLGs) with high compaction and simple structure are presented and investigated in this paper. Due to the strong confinement of edge mode graphene surface plasmon polaritons (EGSPPs), it can process optical signal on nanoscale ribbons with both straight and flexible shapes. Three eigen modes of graphene surface plasmon polaritons (GSPPs) are studied from the aspect of their propagation properties, indicating that the symmetric edge-mode (SEM) is an optimal choice for designing the GPLGs. Finally, some basic logic gates, i.e., the XOR and XNOR gates, are demonstrated by employing the SEM. More kind of GPLGs and functional devices are expected to be realized by cascading these basic logic gates.
关键词： Logic-based optical processing,Surface plasmons,All-optical devices,Planar,Waveguides
更新于2025-09-23 15:21:01
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Comprehensive modeling and design of Raman lasers on SOI for mid-infrared application
摘要： In this paper, we present a comprehensive model for a CW Raman laser in a silicon-on-insulator (SOI) platform. We validate this model by comparing its output with experimental results from the literature. We then design a 2.232 μm Raman laser with an on-chip ring resonator cavity. Numerical analysis of laser characteristics, such as threshold power and output power, are conducted. The optimized values for the cavity length and power coupling ratios are determined taking into account fabrication variations. Finally, by designing a tunable directional coupler (DC) for the laser cavity, a robust design of Raman laser is presented. We show that the reduction of propagation loss down to 0.6 dB/cm for the silicon waveguides and free carriers removal, by the use of a p-i-n junction, will enable a Raman laser with a threshold power of 16 mW and a slope efficiency of 62%.
关键词： Nonlinear optical devices,Raman scattering,Ring lasers
更新于2025-09-23 15:21:01
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On-chip enhanced electro-optic Kerr effect for manipulation of optical orbital angular momentum modes
摘要： Mode Division Multiplexing (MDM) technique using higher order Orbital Angular Momentum (OAM) carrying modes through a channelized bandwidth provides enhanced capacity communication systems. Furthermore, encrypted channels via OAM based high-dimensional Quantum Key Distribution (QKD) improve the transmission rate and security. In such applications, mode-selective manipulation of the spatially distributed (here, OAM) modes is a significant function to implement MDM and QKD networks. This paper proposes a novel versatile-designed chip which is configured in a Ycut Periodically Poled Lithium Niobate (PPLN) photonic wire. This integrated optical device acts as spatial mode converter for data modulated on higher order OAM= ±2ˉh modes. The conversion is based on enhanced electro-optic (EO) Kerr effect via phase-mismatched cascaded polarization coupling interactions of decomposed guided modes in two successive PPLN sections. The high-purity (91%) and low-voltage (<14.6 V) of the proposed device enable its operation in compatible with applicable commercial modulators in OAM-based MDM and QKD systems.
关键词： Electro-optical devices,Integrated optics,Modulators,Singular optics
更新于2025-09-23 15:21:01
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Hybrid Graphene-Silicon Based Polarization-Insensitive Electro-Absorption Modulator with High-Modulation Efficiency and Ultra-Broad Bandwidth
摘要： Polarization-insensitive modulation, i.e., overcoming the limit of conventional modulators operating under only a single-polarization state, is desirable for high-capacity on-chip optical interconnects. Here, we propose a hybrid graphene-silicon-based polarization-insensitive electro-absorption modulator (EAM) with high-modulation efficiency and ultra-broad bandwidth. The hybrid graphene-silicon waveguide is formed by leveraging multi-deposited and multi-transferred methods to enable light interaction with graphene layers in its intense field distribution region instead of the commonly used weak cladding region, thus resulting in enhanced light–graphene interaction. By optimizing the dimensions of all hybrid graphene-silicon waveguide layers, polarization-insensitive modulation is achieved with a modulation efficiency (ME) of ~1.11 dB/μm for both polarizations (ME discrepancy < 0.006 dB/μm), which outperforms that of previous reports. Based on this excellent modulation performance, we designed a hybrid graphene-silicon-based EAM with a length of only 20 μm. The modulation depth (MD) and insertion loss obtained were higher than 22 dB and lower than 0.23 dB at 1.55 μm, respectively, for both polarizations. Meanwhile, its allowable bandwidth can exceed 300 nm by keeping MD more than 20 dB and MD discrepancy less than 2 dB, simultaneously, and its electrical properties were also analyzed. Therefore, the proposed device can be applied in on-chip optical interconnects.
关键词： integrated optical devices,electro-optic modulator,silicon photonics,graphene
更新于2025-09-19 17:15:36
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Spin Plasmonics and Surface Enhanced Raman Spectroscopy in Label Free Biomolecular Sensing
摘要： We report the results of a study of an optical sensor based on a channel-drop technique with two cascaded cavities in photonic-crystal slabs. Quality factors and intensities of the resonant modes of the sensor were analyzed with three-dimensional simulations. With the introduction of a re?ector in the bus-channel and by control of the coupling between the two cavities and the drop-channel, the drop ef?ciency can be remarkably increased. In addition to the simulation, the two cavity sensor is fabricated and tested for optical response to water and oil in?ltration. Both direct visual imaging and quantitative analysis were applied in experiment. A difference of refractive index Δn = 0.12 between water and oil samples results in a wavelength shift of 18.3 nm, which greatly matches the simulation result of 20 nm and indicates a sensitivity of 153 nm RIU?1. Both resonant peaks for water and oil in?ltration have good selectivity in their transmission spectrum. The contrast between the broadband output of the bus-channel and the highly wavelength-selective outputs of the drop-channel opens opportunities for the two cascaded-cavity system as a fundamental building block for a multiplex drop-channel array for all-optical sensing, which can be widely used for bio/chemical detection and environmental monitoring.
关键词： photonic integrated circuits,multiplexing,optical sensors,photonic crystals,optical coupling,Cavity resonators,optical waveguide,optical devices
更新于2025-09-19 17:13:59