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Enhanced optical Kerr nonlinearity of graphene/Si hybrid waveguide
摘要： In this work, we experimentally study the optical Kerr nonlinearities of graphene/Si hybrid waveguides with enhanced self-phase modulation. In the case of CMOS compatible materials for nonlinear optical signal processing, Si and silicon nitride waveguides have been extensively investigated over the past decade. However, Si waveguides exhibit strong two-photon absorption (TPA) at telecommunication wavelengths, which leads to a signi?cant reduction of the nonlinear ?gure-of-merit (FOM). In contrast, a silicon nitride based material system usually suppresses the TPA but simultaneously leads to the reduction of Kerr nonlinearity by one order of magnitude. Here, we introduce a graphene/Si hybrid waveguide, which maintains the optical properties and CMOS compatibility of Si waveguides, while enhancing the Kerr nonlinearity, by transferring over to the top of the waveguides. The graphene/Si waveguides are measured to have an enhanced nonlinear parameter of 510 W(cid:2)1 m(cid:2)1, compared with that of the Si waveguide of 150 W(cid:2)1 m(cid:2)1. An enhanced nonlinear FOM of 2.48 6 0.25 has been achieved, which is four times larger than that of the Si waveguide of 0.6 6 0.1. This work reveals the potential application of graphene/Si hybrid waveguides with high Kerr nonlinearity and FOM for nonlinear all-optical signal processing.
关键词： nonlinear all-optical signal processing,graphene/Si hybrid waveguide,optical Kerr nonlinearity,CMOS compatible,self-phase modulation
更新于2025-11-28 14:23:57
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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) - Feasibility Analysis Using Load Profile Modeling Scenarios of Achieving Peak Shaving Using Grid-Tied PV for a Small Utility in Boone, North Carolina
摘要： The distributed Brillouin analysis of an 8.8-km-long fiber with a spatial resolution of 2 cm is presented. All 440 000 potential resolution points are addressed in the measurement. A 7-cm-long hot-spot, located toward the output end of the pump wave, is properly identified in the experiment. The experimental error in the estimate of the local values of the Brillouin frequency shift is ±3.5 MHz. The analysis is based on the simultaneous generation and analysis of Brillouin interaction in more than 2000 correlation peaks, induced by periodic phase modulation of the pump and signal waves. The Brillouin amplifications at individual peaks are resolved using radar-like coding of pump wave magnitude by a 10000 bit-long aperiodic sequence, and postdetection compression at the receiver end. Extensive numerical simulations of the Brillouin interactions over kilometers of fiber with centimeter resolution are reported as well. The results are at the state of the art for high-resolution distributed Brillouin sensors.
关键词： All-optical signal processing,fiber-optic sensors,correlation-domain analysis,stimulated Brillouin scattering,distributed fiber sensors,sequence compression
更新于2025-09-23 15:19:57
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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) - An Insight into Pure Ge Based Kesterite Synthesis
摘要： The distributed Brillouin analysis of an 8.8-km-long ?ber with a spatial resolution of 2 cm is presented. All 440 000 potential resolution points are addressed in the measurement. A 7-cm-long hot-spot, located toward the output end of the pump wave, is properly identi?ed in the experiment. The experimental error in the estimate of the local values of the Brillouin frequency shift is ±3.5 MHz. The analysis is based on the simultaneous generation and analysis of Brillouin interaction in more than 2000 correlation peaks, induced by periodic phase modulation of the pump and signal waves. The Brillouin ampli?cations at individual peaks are resolved using radar-like coding of pump wave magnitude by a 10000 bit-long aperiodic sequence, and postdetection compression at the receiver end. Extensive numerical simulations of the Brillouin interactions over kilometers of ?ber with centimeter resolution are reported as well. The results are at the state of the art for high-resolution distributed Brillouin sensors.
关键词： sequence compression,All-optical signal processing,stimulated Brillouin scattering,?ber-optic sensors,distributed ?ber sensors,correlation-domain analysis
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Low Noise Optical Buffering Based on Non-Degenerate Phase Sensitive Parametric Amplification
摘要： Optical buffers are devices which can store optical signals for a period of time and could be valuable tools for applications such as optical storage, optical packet switching and all-optical signal processing providing the storage functionality in the optical domain, thus avoiding unwanted opto-electronic and eletro-optical conversions. During the last twenty years, there have been proposed many approaches for the implementation of optical buffers. The most straightforward scheme is the use of a fiber spool playing the role of a long-time optical delay line which requires either direct or indirect amplitude modulation to maintain the bit timing [1]. Other interesting techniques referring to optical buffering are slow-light [2], temporal solitons in optical cavities [3], excitability properties of optical devices [4] and photonic crystal nanocavities [5]. In this paper, a buffer relying on long-time optical delays supported by phase-sensitive amplification (PSA) is theoretically and numerically analysed. The scheme is compared against a buffer employing phase insensitive amplification (PIA). The buffer is studied for different levels of internal losses and in two configurations: the first considers that the PSA gain element precedes the source of losses whilst the second topology considers the opposite. Results derived from numerical simulations based on Nonlinear Schrodinger Equation (NLSE) solved with the use of split-step Fourier method taking into account polarization mode dispersion and quantum noise are also presented. The results show that the PSA enabled buffer is more robust to the accumulated noise attributed to multiple circulations in the optical cavity and can preserve the signal fidelity for hundreds of circulations, thus emerging as a promising long run buffering solution, being modulation format transparent and with the potential of multi-wavelength buffering as it will be shown in the context of the paper.
关键词： all-optical signal processing,noise figure,phase-sensitive amplification,optical storage,optical buffering
更新于2025-09-11 14:15:04