- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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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) - Tailoring Donor-Acceptor Pairs of Tungsten-based Transition Metal Di-Chalcogenides (TMDCs) for Improved Photovoltaic Current Generation
摘要： We present a multifunctional scheme to implement reconfigurable temporal Fourier transformation (TFT) and temporal imaging (TI) flexibly. This structure is composed of a time lens followed by a section of dispersive fiber with proper length. More specifically, the output waveforms presenting either the spectrum profile or the scaled waveform profile of the input signal are achieved by simply changing the length of the fiber, which is theoretically analyzed and experimentally verified. This proposal requires neither the use of an input dispersive device preceding the time lens nor a second time lens after the dispersion. Hence, it is a simple and practical alternative to the implementation of both TFT and TI.
关键词： fourier optics and signal processing,optics fiber communications,time lens,four wave mixing (FWM),Dispersive Fourier transformation
更新于2025-09-19 17:13:59
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Analysis of Four Wave Mixing Effects in 16 ??10 Gb/S WDM Optical Communication System
摘要： The fiber nonlinearities are one of the main performance limiting factors in any optical communication system. There are several parameters that effectively contribute in mitigation of these fiber nonlinearities such as fiber dispersion, effective area of fiber core, etc. Here, we have investigated the four wave mixing (FWM) nonlinear impairments in 16-channel WDM system. The FWM crosstalk becomes very critical to handle for long haul transmission systems at high power levels. Here, 16 channels WDM is being implemented and its performance is evaluated in terms of bit error rate (BER), Q factor, etc. for distance transmission upto 500 km.
关键词： passive optical networks (PONs),single mode fiber (SMF),four wave mixing (FWM)
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) - Simultaneous generation of laser sources in S, C and L bands through four-wave mixing of electro-optic frequency combs
摘要： Increasing bandwidth demands necessitate the use of several carriers in wavelength division multiplexing. Conventionally, carrier wavelengths were generated by individual lasers which suffer from large area and power requirements with scaling of number of carriers. We demonstrate simultaneous generation of over 316 wavelengths in S, C and L bands from two lasers spaced 4 nm apart in the C-band. Electro-optic modulators initially scale each laser to 9 lines (in 20 dB bandwidth). The electro-optic frequency combs are power scaled to ~800 mW and undergo cascaded four-wave mixing in highly nonlinear fiber to generate wavelengths in the three bands. The number of lines in 20 dB bandwidth in S, C and L bands are 88, 160 and 68 respectively. This system can also be used for RF arbitrary waveform generation.
关键词： four-wave mixing,electro-optic modulators,wavelength division multiplexing,highly nonlinear fibers
更新于2025-09-19 17:13:59
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Characterize and optimize the four-wave mixing in dual-interferometer coupled silicon microrings
摘要： By designing and fabricating a series of dual-interferometer coupled silicon microrings, the coupling condition of the pump, signal, and idler beams can be engineered independently and then we carried out both the continuous-wave and pulse pumped four-wave mixing experiments to verify the dependence of conversion ef?ciency on the coupling conditions of the four interacting beams, respectively. Under the continuous-wave pump, the four-wave mixing ef?ciency gets maximized when both the pump and signal/idler beams are closely operated at the critical coupling point, while for the pulse pump case, the ef?ciency can be enhanced greatly when the pump and converted idler beams are all overcoupled. These experiment results agree well with our theoretical calculations. Our design provides a platform for explicitly characterizing the four-wave mixing under different pumping conditions, and offers a method to optimize the four-wave mixing, which will facilitate the development of on-chip all-optical signal processing with a higher ef?ciency or reduced pump power.
关键词： silicon resonators,four-wave mixing,Mach–Zehnder interferometer
更新于2025-09-19 17:13:59
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[IEEE 2019 Photonics North (PN) - Quebec City, QC, Canada (2019.5.21-2019.5.23)] 2019 Photonics North (PN) - 25 W splice-less erbium-doped fiber laser at 1584 nm
摘要： We present a multifunctional scheme to implement reconfigurable temporal Fourier transformation (TFT) and temporal imaging (TI) flexibly. This structure is composed of a time lens followed by a section of dispersive fiber with proper length. More specifically, the output waveforms presenting either the spectrum profile or the scaled waveform profile of the input signal are achieved by simply changing the length of the fiber, which is theoretically analyzed and experimentally verified. This proposal requires neither the use of an input dispersive device preceding the time lens nor a second time lens after the dispersion. Hence, it is a simple and practical alternative to the implementation of both TFT and TI.
关键词： fourier optics and signal processing,time lens,optics fiber communications,four wave mixing (FWM),Dispersive Fourier transformation
更新于2025-09-19 17:13:59
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semiconductor waveguide platforms
摘要： We design the high confinement InP/In1?xGaxAsyP1?y semiconductor waveguides and investigate the effective wavelength conversion based on this platform. Efficient confinement and mode field area fluctuation at different wavelength is analyzed to achieve the high nonlinear coefficient. The numerical results show that nearly zero phase-mismatch condition can be satisfied through dispersion tailoring of InP/In1?xGaxAsyP1?y waveguides, and the wavelength conversion ranging over 40 nm with the maximum conversion efficiency ?26.3 dB is achieved. Meanwhile, the influences of the doping parameter y and pumping wavelength on the bandwidth and conversion efficiency are also discussed and optimized. Our demonstration of the excellent all-optical wavelength conversion properties of the InP/In1?xGaxAsyP1?y waveguides could pave the way towards direct integration telecom band devices on stand semiconductor platforms.
关键词： Wavelength conversion,Four-wave mixing,InP/In1?xGaxAsyP1?y waveguide,Nonlinear optics
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Computational Intelligence and Knowledge Economy (ICCIKE) - Dubai, United Arab Emirates (2019.12.11-2019.12.12)] 2019 International Conference on Computational Intelligence and Knowledge Economy (ICCIKE) - Optimized FWM Parameters for FTTH Using DWDM Network
摘要： A DWDM System consisting of transmitter, optical span and receiver is designed. The line coding technique NRZ (Non Return To Zero) has been used as the modulation schemes. The variation in the four wave mixing is analyzed with respect to the designed DWDM (Dense Wavelength Division Multiplexing) system. The DWDM is designed and simulated on Optisystem and their BER (Bit Error Rate) is calculated. The DWDM system is implemented in a FTTH (Fiber To The Home) system and simulated on Optisystem and their BER is calculated.
关键词： DWDM,Bit Error Rate,OptiSystem,FTTH,Four Wave Mixing,Simulation
更新于2025-09-19 17:13:59
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Optical Electronics (An Introduction) || 8. Fundamental of Nonlinear Optics
摘要： Nonlinear optics is an important branch of modern optics that emerged after the invention of laser. It covers the second, third, and higher-order nonlinear optic effects, and also studies some phenomena such as photorefractive effect and photon echo. In Section 8.2, we introduce the basic knowledge of nonlinear optics phase conjugate. Section 8.3 consider three-wave mixing as an example to discuss the second-order nonlinear optics effect. Sections 8.4 to 8.6 successively discuss the four-wave mixing, near-degenerate four-wave mixing, as well as harmonic oscillation four-wave mixing. In Section 8.8, we describe two kinds of elastic scattering that belong to the third order of nonlinear optics. Photon echo is a transient process along with a special nonlinear optics effect, Photorefractive phenomenon will be descripted in Sections 8.7 and 8.9. Phase conjugate waves can be produced in several nonlinear optics processes. Because phase conjugate wave can be used to correct distorted wavefront, it has important applications in laser nuclear fusion, lens-less imaging, and high-power, and high-light beam quality laser. These topics are also an important part of this chapter.
关键词： phase conjugate,Nonlinear optics,four-wave mixing,three-wave mixing,photon echo,photorefractive effect
更新于2025-09-16 10:30:52
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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) - Infrared 1000-nm-Supercontinuum by Means of Self-Frequency Shift of Raman Solitons Supported by Four-Wave Mixing
摘要： Infrared spectroscopy is deployed in various fields of science and technology such as organic and inorganic chemistry, monitoring of greenhouse gases, food industry, artwork conservation, and analysis of polymers and semiconductor microelectronics [1]. The supercontinuum generation based on self-frequency shift (SFS) of Raman solitons in various optical fibres is a technology to provide promising spectra for infrared spectroscopy applications. However, these spectra are restricted in range due to the limitations of Raman gain spectrum and optical absorption in silica fibres beyond the C band. Thus, they hardly spread over 300 nm if starting from around 1550 nm [2]. However, as I show here using numerical simulations of the Generalised Nonlinear Schr?dinger Equation, if the SFS of Raman solitons is supported by the effect of four-wave mixing (FWM), the range of such supercontinuum can increase up to 1000 nm counteracting the limits of Raman gain and optical absorption.
关键词： four-wave mixing,Infrared spectroscopy,self-frequency shift,Raman solitons,supercontinuum generation
更新于2025-09-16 10:30:52
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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) - Tailored Spontaneous Four-Wave Mixing in Sinusoidally-Tapered Fibres
摘要： Quasi-phase-matching periodically-tapered waveguides (PTWs) can enable efficient on-demand third-order parametric interactions using right combinations of the tapering period and modulation amplitude. Similar to periodically-poled ferroelectric crystals, this new technique eliminates the stringent constraints imposed by conventional methods on the frequencies, mode profiles, and polarisations of the interacting photons. An example of PTWs is the sinusoidally-tapered fibres that have been exploited in manipulating supercontinuum generation and modulation instability. In this work, I have developed a rigorous quantum model to investigate spontaneous four-wave mixing (SFWM) inside these tapered waveguides. The right combinations between the modulation amplitude ?d and tapering period ΛT that enhances the expected number of photons N?s at the targeted wavelengths are portrayed in Fig.1(a), for fibres with same number of periods M. The values of N?s are normalised to the case when ?d=0, to quantify the enhancement in photon-pairs generation using the PTW-technique in comparison to uniform fibres. For only M=50, N?s is remarkably enhanced by 35dB. The output spectrum of the photon-pairs is featured as a narrow sinc-function with very weak sidelobes that are significantly diminished for large number of periods, as depicted in Fig.1(b). The 2D representation of the spectrum as a function of the photon-pairs wavelengths (λs, λi) is shown in panel (c). In this plot, the pump is assumed to be a monochromatic at a frequency satisfies the energy conservation. The corresponding N?s for a Gaussian-pulse pump source with an input energy 1nJ and a full-width-half-maximum 4ps is portrayed in analysis, Fig.1(d). Using the Schmidt decomposition, the spectral-purity is 0.74. This shows the ability of the PTW-technique in producing highly-efficient relatively-pure single photons at any on-demand frequencies without applying any bandpass filters. This work will also open a new direction of research to investigate how the tapering patterns can be fully optimised to tailor the spectral properties of the output photons in third-order nonlinear guided structures.
关键词： spectral-purity,Quasi-phase-matching,spontaneous four-wave mixing,periodically-tapered waveguides,photon-pairs generation
更新于2025-09-16 10:30:52