- 标题
- 摘要
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- 实验方案
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High coherence collapse of a hybrid III-V/Si semiconductor laser with a large quality factor
摘要： The high-speed dynamics of a hybrid distributed feedback semiconductor laser heterogeneously integrated onto silicon is experimentally investigated in the presence of external optical feedback. The laser fabrication relies on a proper modal engineering in which light is generated in the III-V material and stored in the low-loss silicon region in order to substantially enhance the quality factor of the cavity resonator. In this work, the hybrid laser is found to be insensitive to parasitic re?ections leading to a 10 Gbps ?oor-free transmission with a power penalty no greater than 1.5 dB at room temperature. As a conclusion, owing to the large quality factor, a high coherence collapse level is unveiled in such laser indicating its vast potential to serve as an alternative solution for the development of isolator-free applications in future photonics integrated circuits. A qualitative interpretation is also provided by linking the standard feedback equations to the quality factor of the resonator.
关键词： optical feedback,Semiconductor lasers,photonics integrated circuits.
更新于2025-09-16 10:30:52
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Orientation‐Controlled 2D Anisotropic and Isotropic Photon Transport in Cocrystal Polymorph Microplates
摘要： Two-dimensional (2D) anisotropic transport of photons/electrons is crucial for constructing ultracompact on-chip circuits. To date, the photons in organic 2D crystals usually exhibit the isotropic propagation, and the anisotropic behaviors have not yet been fully demonstrated. Herein, an orientation-controlled photon-dipole interaction strategy was proposed to rationally realize the anisotropic and isotropic 2D photon transmissions in two self-assembled cocrystal polymorph microplates. The monoclinic microplate adopting a nearly horizontal molecular transition dipole orientation in the 2D plane, exhibits anisotropic photon-dipole interactions and thus distinct re-absorption waveguide losses for different 2D directions. By contrast, the triclinic microplate with a vertical transition dipole orientation, shows the 2D isotropic photon-dipole interactions and thus the same re-absorption losses along different directions. Based on the anisotropic transport mechanism, a directional signal outcoupler (DSO) was further designed for the high-fidelity transmission of the real signals, which would enlighten the development of 2D anisotropic optical devices.
关键词： transition dipole moment,Cocrystal,polymorphs,two-dimensional photonics,anisotropic optical waveguides
更新于2025-09-16 10:30:52
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Control and calibration recipes for photonic integrated circuits
摘要： This paper presents the key ingredients and the best practices for implementing simple, effective and robust control and calibration procedures for arbitrary photonic integrated circuit (PIC) architectures. Three main features are presented and discussed: a technique to cancel out the effects of mutual crosstalk among thermal tuners, the exploitation of labelling to identify different optical signals, the use of input modulated signal to automatically reshape the frequency response of the device. Examples of application are then illustrated to show the validity and generality of the approach, namely a cross-bar interconnect matrix router, a variable bandwidth filter and third order coupled microring filter. Further, the automatic and dynamic generation of the lookup table of add/drop hitless filters operating on a dense wavelength division multiplexing grid is demonstrated. The lookup table achieved with the proposed approach can dynamically update itself to new conditions of the chip or new requirements of operation, such as variations in channel modulation format or perturbation induced by neighboring devices due to a change in their working point.
关键词： control,optical filters,microring resonators,pilot tones,integrated photonics,calibration,look up tables,thermal cross talk,tuning,locking
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Non-volatile silicon photonic devices enabled by phase change material
摘要： We review our recent research progress on silicon-Ge2Sb2Te5 hybrid photonic devices. The optical transmission can be varied by 20 dB using micron-length GST. The inherent "self-holding" feature of GST make it attractive for low-power applications.
关键词： silicon photonics,optical memory,microring resonator,optical switch
更新于2025-09-16 10:30:52
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Photonics tech brings in the big guns [satellite optical communications]
摘要： The article discusses the transition from coaxial cables to fibre-optic interconnects in satellite communications, highlighting the benefits of photonics technologies in terms of size, weight, and power efficiency. It covers the development and qualification of fibre-optic technologies for space applications, including the first operational use of fibre-optics communications in institutional satellites and the potential for microphotonics in future satellite payloads.
关键词： space technology,microphotonics,satellite communications,photonics,fibre-optic interconnects
更新于2025-09-16 10:30:52
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Solid-Electrolyte-Gated Graphene-Covered Metal-Insulator-Silicon-Insulator-Metal Waveguide With a Remarkably Large Modulation Depth
摘要： Silicon photonic modulators are an essential element in providing fast and massive connectivity to the data-centric world. Ever-increasing data usage requires them to be smaller, faster, and easier to fabricate. Graphene with exceptional properties has been emerging as a material for such next-generation silicon photonic modulators, and a variety of graphene-based photonic or plasmonic modulators have been realized and verified. However, due to weak light-graphene interaction in them, they have a modulation depth smaller than 0.16 dB/μm, which is similar to those of existing germanium-silicon electroabsorption modulators. This work reports a graphene-covered hybrid plasmonic waveguide that has truly strong light-graphene interaction. The hybrid plasmonic waveguide is realized with standard CMOS technology and efficiently coupled to a conventional Si waveguide. To prove the strong light-graphene interaction, solid-electrolyte gating is used to modulate the intensity of the waveguide although its modulation speed is slow. It is demonstrated that the waveguide has a remarkably large modulation depth of 0.276 dB/μm even though just one single-layer graphene covers the waveguide. This demonstration opens the door to the waveguide covered with a graphene-oxide-graphene capacitor, which may have a larger modulation depth and a large 3-dB bandwidth, and it is theoretically analyzed. This work may be the solid base for a graphene-based silicon photonic modulator which is theoretically expected to surpass current silicon photonic modulators.
关键词： intensity modulation,nanophotonics,optical waveguides,silicon photonics,Integrated optics
更新于2025-09-16 10:30:52
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Hybrid External Cavity Laser with an Amorphous Silicon-Based Photonic Crystal Cavity Mirror
摘要： The authors present results on the performance of a hybrid external cavity photonic crystal laser-comprising semiconductor optical ampli?er, and a 2D photonic crystal cavity fabricated in low-temperature amorphous silicon. The authors demonstrate that lithographic control over amorphous silicon photonic crystal cavity-resonant wavelengths is possible, and that single-mode lasing at optical telecommunications wavelengths is possible on an amorphous silicon platform.
关键词： nanophotonics,silicon photonics,amorphous silicon,CMOS processing,photonic crystals,telecommunications,lasers
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Design of a high outband rejection cross-coupled SIW filter for millimeter wave communications
摘要： In this paper, we demonstrate ultra-fast millimeter wave beam steering with settling times below 50 ps. A phased array antenna with two elements is employed to realize beam steering. The phased array feeder is implemented with a recently introduced time delay line that provides, at the same time, an ultra-fast tunability, broadband operation, and continuous tuning. Our implementation is used to perform symbol-by-symbol steering. In our demonstration, the beam direction is switched between two sequentially transmitted symbols toward two receivers placed 30° apart. We show the successful symbol-by-symbol steering for data streams as fast as 10 GBd. The suggested scheme shows that the ultra-fast beam steering is becoming practical and might ultimately enable novel high bit-rate multiple access schemes.
关键词： Ultra-fast beam steering,radio access network,microwave photonics,millimeter wave communication
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Mid-Infrared Silicon Waveguide-Based Bolometer
摘要： We demonstrate the ?rst waveguide-based bolometers on Silicon-on-Insulator (SOI) platform for mid-infrared (MIR) wavelengths, which use plasmonic antennas as absorbing elements. The bolometer achieves a sensitivity of 0.80 % change in resistance per milliwatt of input power at the 3.8 μm wavelength.
关键词： mid-infrared,silicon photonics,bolometer,optical antenna
更新于2025-09-16 10:30:52
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Modeling and Optimization of Vortex Modes Propagation in Rectangular Dielectric Waveguides
摘要： We study analytically and numerically the possibility of vortex modes propagation over planar dielectric rectangular waveguides, and consider the problem of waveguide geometry optimization for the support of vortex modes. The results show, that theoretically rectangular waveguides can provide transmission of quasi-TE and quasi-TM modes with high purity states of orbital angular momentum (OAM) in the dominant ?eld component. However, only for the quasi-generate mode of azimuthal order ±1 the constituent eigenmodes can propagate in a phase-matched regime, and the vortex modes of higher azimuthal orders can propagate only with a certain beat length. Moreover, as the target azimuthal order increases, the normalized power of the corresponding OAM state in the modal superposition decreases. The analytical predictions have been veri?ed by numerical electromagnetic simulations of silicon nitride waveguides providing ?eld distributions and OAM spectra of the corresponding modal superpositions.
关键词： integrated photonics,silicon nitride,optical waveguides,Optical orbital angular momentum (OAM)
更新于2025-09-16 10:30:52