- 标题
- 摘要
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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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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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Ultrafast Nano-scale Optical Switching in a Plasmonic Interferometer with Enhanced Tunability
摘要： An all-optical switch based on plasmonic metal–insulator–metal (MIM) waveguides and the Mach–Zehnder (MZ) interferometer is designed. In order to realize an all-optical and active switch, a nonlinear material with intensity-dependent refractive index is introduced in one arm. Other than studying a typical MZ structure, we also investigate the asymmetric case where unequal thicknesses and distances for MZ arms are proposed. The finite element method (FEM) with a refined triangle mesh is employed for simulations. Results for ON and OFF states are provided with or without employing the pump field. Investigation of the geometrical dispersion reveals tunability of the structure for specific frequencies in the terahertz region. Finally, we show that introducing asymmetric arms provides better tunability in the designed ultrafast nano-scale switch and suggests its potential applications in integrated optical circuits.
关键词： Nonlinear optical devices,Mach-Zehnder interferometer,Surface plasmon polaritons,Plasmonic switches
更新于2025-09-16 10:30:52
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Parametric Nonlinear Silicon-Based Photonicsv
摘要： Integrated silicon photonics is revolutionizing the field of optical communications as hybrid photonic/electronic integrated circuits made from this semiconductor material can seamlessly process signals spanning both the optical and electrical domains. The enormous bandwidth afforded by optical signaling enables extremely high aggregate data-rate communication signals. Correspondingly, signal processing devices must employ new mechanisms to keep up with the ever increasing need for greater capacity in communications. To this end, parametric nonlinear optical interactions in silicon-based materials provide a route toward processing and handling signal bandwidths well beyond a THz. These integrated silicon-based photonic structures also benefit from high optical confinement, large nonlinear optical responses, and long interaction lengths, making them highly suitable for power-efficient parametric nonlinear optical interactions. In particular, the parametric nonlinear optical interaction of four-wave mixing (FWM) in silicon-based photonic devices has enabled a wealth of devices for next-generation information handling applications including communications, all-optical computing, metrology, and security, which will be highlighted in this review.
关键词： nonlinear optical devices,photonic integrated circuits,silicon photonics,Four-wave mixing
更新于2025-09-10 09:29:36