- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Complete Scene Reconstruction by Merging Images and Laser Scans
摘要： Optical fibre transmission has enabled greatly increased transmission rates with 10 Gb/s common in local area networks. End users find wireless access highly convenient for mobile communication. However, limited spectrum availability at microwave frequencies results in per-user transmission rates limited to much lower values, e.g., 500 Mb/s for 5-GHz band IEEE 802.11ac. Extending the high data-rate capacity of optical fiber transmission to wireless devices requires greatly increased carrier frequencies. This paper will describe how photonic techniques can enable ultrahigh capacity wireless data distribution and transmission using signals at millimeter-wave and TeraHertz (THz) frequencies.
关键词： photonic integrated circuits,microwave photonics,Broadband communication,optical mixing,optical heterodyne,millimeter (mm)-wave generation,optical phase lock loops,semiconductor lasers
更新于2025-09-19 17:13:59
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Using the Belinfante momentum to retrieve the polarization state of light inside waveguides
摘要： current day high speed optical communication systems employ photonic circuits using platforms such as silicon photonics. In these systems, the polarization state of light drifts due to effects such as polarization mode dispersion and nonlinear phenomena generated by photonic circuit building blocks. As the complexity, the number, and the variety of these building blocks grows, the demand increases for an in-situ polarization determination strategy. Here, we show that the transfer of the Belinfante momentum to particles in the evanescent field of waveguides depends in a non-trivial way on the polarization state of light within that waveguide. Surprisingly, we find that the maxima and minima of the lateral force are not produced with circularly polarized light, corresponding to the north and south poles of the Poincaré sphere. Instead, the maxima are shifted along the great circle of the sphere due to the phase differences between the scattered TE and TM components of light. This effect allows for an unambiguous reconstruction of the local polarization state of light inside a waveguide. Importantly, this technique depends on interaction with only the evanescent tails of the fields, allowing for a minimally invasive method to probe the polarization within a photonic chip.
关键词： waveguides,Poincaré sphere,Belinfante momentum,evanescent field,optical communication,photonic chip,TE and TM components,silicon photonics,polarization state
更新于2025-09-19 17:13:59
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High-Power, Narrow-Linewidth, Miniaturized Silicon Photonic Tunable Laser with Accurate Frequency Control
摘要： We have demonstrated a hybrid-integrated silicon photonic (SiPh) tunable laser in a miniaturized package, suitable for coherent modules in small form factors such as OSFP and QSFP-DD. Through the integration of an in-house-designed high-power semiconductor optical amplifier (SOA), the developed SiPh laser has achieved a record-high output power of 21.5 dBm across the C-band. Also, this laser exhibits narrow linewidths down to 60 kHz, SMSR larger than 50 dB, low relative intensity noise below -150 dB/Hz, and a broad tuning range of 65 nm. These performance parameters are preferable for 400 Gb/s and beyond coherent communications using advanced high-order modulation formats. Moreover, an on-chip integrated sensor technology was developed for accurate laser frequency control. We have achieved 1 GHz frequency stability of SiPh laser against SOA current changes or package temperature variations between 10 oC and 80 oC. We further show the feasibility of this developed SiPh laser for 64 Gbaud, 16/64 QAM coherent transmission by integrating with an in-house InP-PLC hybrid coherent optical subassembly (COSA).
关键词： Wavelength tunable lasers,Silicon photonics,Hybrid integration,Photonic integrated circuits,Semiconductor optical amplifiers
更新于2025-09-19 17:13:59
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Terahertz topological photonics for on-chip communication
摘要： The realization of integrated, low-cost and efficient solutions for high-speed, on-chip communication requires terahertz-frequency waveguides and has great potential for information and communication technologies, including sixth-generation (6G) wireless communication, terahertz integrated circuits, and interconnects for intrachip and interchip communication. However, conventional approaches to terahertz waveguiding suffer from sensitivity to defects and sharp bends. Here, building on the topological phase of light, we experimentally demonstrate robust terahertz topological valley transport through several sharp bends on the all-silicon chip. The valley kink states are excellent information carriers owing to their robustness, single-mode propagation and linear dispersion. By leveraging such states, we demonstrate error-free communication through a highly twisted domain wall at an unprecedented data transfer rate (exceeding ten gigabits per second) that enables real-time transmission of uncompressed 4K high-definition video (that is, with a horizontal display resolution of approximately 4,000 pixels). Terahertz communication with topological devices opens a route towards terabit-per-second datalinks that could enable artificial intelligence and cloud-based technologies, including autonomous driving, healthcare, precision manufacturing and holographic communication.
关键词： topological photonics,silicon chip,valley kink states,on-chip communication,terahertz
更新于2025-09-19 17:13:59
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CMOS-Compatible Optical Phased Array Powered by a Monolithically-Integrated Erbium Laser
摘要： An advanced CMOS-compatible 300-mm-wafer silicon-photonics platform is introduced that consists of a silicon layer with eight doping masks, two silicon-nitride layers, three metal and via layers, a dicing trench for smooth edge-coupled facets, and a gain-film trench that enables interaction between the gain material and waveguide layers. The platform was used to demonstrate an electrically-steerable integrated optical phased array powered by an on-chip erbium-doped laser. Lasing with a single-mode output, 30 dB side-mode-suppression ratio, and 40 mW lasing threshold was shown, and one-dimensional beam steering with a 0.85? × 0.20? full-width at half-maximum and 30?/W electrical steering efficiency was demonstrated. This system represents the first demonstration of a rare-earth-doped laser monolithically integrated with an active CMOS-compatible silicon-on-insulator photonics system.
关键词： Silicon photonics,rare-earth-doped lasers,integrated optical phased arrays,photonic integrated circuits
更新于2025-09-19 17:13:59
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Polariton Photonics Using Structured Metals and 2D Materials
摘要： Polaritons are quasiparticles originating from strong interactions between photons and elementary excitations that could enable high tunability, tight electromagnetic field confinement, and large density of photonic states, making it possible to achieve novel and otherwise inaccessible functionalities. For these reasons, polaritons spawn great interest in the fields of physics, materials science, and optics for both fundamental studies as well as potential applications (e.g., modulators, photodetectors, photoluminescence, etc.). In recent years, the explosive growth of research in graphene and other 2D van der Waals materials is witnessed because they provide a new platform that substantially complements conventional metals, dielectrics, and semiconductors to investigate different polariton modes. This review highlights the works published in recent years on the topic of polariton photonics based on structured metals, graphene, and transition-metal dichalcogenides (TMDs). The exotic optical properties of the polaritons in metallic structures and 2D van der Waals materials offer bright prospects for the development of high-performance photonic and optoelectronic devices.
关键词： polaritons,metals,graphene,2D materials,photonics
更新于2025-09-19 17:13:59
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[IEEE 2018 4th IEEE International Conference on Emerging Electronics (ICEE) - Bengaluru, India (2018.12.17-2018.12.19)] 2018 4th IEEE International Conference on Emerging Electronics (ICEE) - Hierarchical structures and multiscale optical coupling for improved photodetectors
摘要： Hierarchical structures comprise of patterns which are themselves structured at lower length scales. Such structures can outperform the performance limits posed by continuum and non-hierarchical structures. However, the possible role of hierarchical structuring in photonics and optoelectronics are not well understood. Here we report on the implications of using materials structured at multiple length scales in the design of spectrally uniform photodetectors. We present our results on the design and fabrication of hierarchical structures comprising of alternating planar and nanostructured microscale domains interspersed with nanoscale objects. These structures show the possibility of obtaining unusual control over the flow of light compared to conventional non-hierarchical structures through the coupling of light across micro-domains. These multiscale structures are fabricated using self-assembly and a novel mechanical strain- augmented template based nano-molding process. We fabricate in a random multi-periodic nanostructures embedded distribution of micro-domains, using an initial template which has only monoperiodic structures. Organic photodetectors fabricated on these molded multiscale platforms show considerable improvements in spectral uniformity. This design advantage arises through the multiscale optical processes which preferentially filter light entering the absorber, which occur only in a hierarchically structured device. In summary, this paper explores unusual ways to control the flow of light using hierarchical structures. On the optoelectronic design front, hierarchical structures are seen to improve the spectral uniformity of photodetectors beyond the limits of continuum and non-hierarchical material design. Further, this effort pushes the limits of monodisperse self-assembly to fabricate static multiperiodic structures, using facile mechanical strain augmented nanofabrication, which was hitherto a challenge.
关键词： multiscale,hierarchical,optoelectronics,photodetectors,self-assembly,photonics
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Epitaxial Lifted-Off Thin Film GaInP/GaAs/GaInNAsSb Lattice-Matched Triple Junction Solar Cells
摘要： The increasing number of computational servers in data centers is imposing tighter constraints on the networking infrastructure. Scalable power efficient optical interconnect network becomes necessary to leverage the bandwidth capacity of current electronic switches or opto-electronic components. Hence, novel optical interconnect technology can enhance the network capacity by harnessing the feasibility of simultaneous processing of optical signal in the wavelength and time domains. In this paper, we present a four channel optical passive wavelength-striped mapping (PWSM) device, which passively time compresses/expands serial packets through optical wavelength multiplexing/demultiplexing. The PWSM device, which has a 1 × 4 channel optical wavelength demultiplexer with integrated optical delay lines, is designed in a low-loss Si3N4 (propagation loss ～3.1 dB/m) waveguide platform. The PWSM device multiplexes/demultiplexes four WDM channels and offsets in time the adjacent channels to optically serialize/de-serialize data packets. In this demonstration, a 64 ns long data packet is formed at the output of the device by combining four 16 ns data segments of the packet in time domain. Incremental optical insertion loss between adjacent channels is ～9.7 dB due to the integrated passive optical delay waveguides. The data rate of the four segmented packets and the combined packet is 25 Gb/sec. We have measured a bit error rate performance below 1 ×10?9 for the 64 ns serial data packet regenerated by the PWSM device for a received optical power of –6.7 dBm.
关键词： silica and silicon nitride photonics,wavelength filtering devices,Photonic integrated circuits
更新于2025-09-19 17:13:59
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[IEEE 2019 Device Research Conference (DRC) - Ann Arbor, MI, USA (2019.6.23-2019.6.26)] 2019 Device Research Conference (DRC) - Efficient Optoelectronics with 2D Materials
摘要： Layered two-dimensional (2D) materials come in a large variety of material combinations and structure, and hence optoelectronic properties. Some of the materials’ intrinsic properties, like broadband absorption from ultraviolet (UV) to far infrared (IR) and THz, direct bandgap or high absorption per layer, make them promising candidates for optoelectronic devices. They can further be integrated with exiting (commercial) technologies to enhance the performance or functionality of state-of-the-art devices. In this talk, several examples of optoelectronic devices will be discussed that exploit certain properties of 2D materials for enhanced performance. All materials used in the respective references have been chemical vapor deposited or thermally converted in the case of platinum diselenide (PtSe2).
关键词： graphene,2D materials,silicon photonics,photodiodes,optoelectronics
更新于2025-09-19 17:13:59
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[IEEE 2019 International Workshop on Fiber Optics in Access Networks (FOAN) - Sarajevo, Bosnia and Herzegovina (2019.9.2-2019.9.4)] 2019 International Workshop on Fiber Optics in Access Networks (FOAN) - Optical mixing of two optical waves from a helium-neon gas laser to generate a stable continuous-wave radio-frequency signal
摘要： An approach to the generation of a radio-frequency signal using a dual longitudinal mode helium–neon (HeNe) gas laser and the optical mixing technique is proposed and demonstrated. Several approaches using lasers and photodetectors with different characteristics give a detailed insight into the potential and utility of the optical mixing of two optical waves to generate a radio-frequency reference source. A low-phase-noise radio-frequency signal is observed by a signal-source analyzer because the two lasing modes share the same gain medium in the few-centimeters-long cavity and the relative phase irregular shifting ?uctuations between the two wavelengths are low. The observed phase noise below -100 dBc/Hz at the offset of 1 kHz from the continuous-wave tone at the central frequency of 723 MHz indicates that the dual-mode-cavity gas laser ef?ciently suppresses the wavelength ?uctuations between the lightwave modes, enabling a stable radio-frequency signal to be generated.
关键词： RF signal generation,Microwave photonics,Wave mixing
更新于2025-09-19 17:13:59