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首页> 外文会议>Nonlinear Optics and Its Applications VIII; and Quantum Optics III >Efficient four-wave-mixing by phase-mismatch switching
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Efficient four-wave-mixing by phase-mismatch switching

机译：通过相位不匹配切换实现高效的四波混频

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摘要

Nonlinear four-wave-mixing (FWM) interactions enable a wide variety of photonic functionalities, including wavelength conversion, all-optical switching, signal regeneration, and generation of entangled photons. To achieve efficient FWM interactions the waves either have to be phase-matched, or a quasi-phase-matching (QPM) scheme has to be realized. However, these techniques conventionally require light-guiding media with specific characteristics. We propose a more general QPM scheme for enabling efficient FWM interactions in the presence of a large phase-mismatch. The scheme is based on increasing the distance over which there is FWM gain, while simultaneously decreasing the distance over which there is FWM loss. This is achieved by adiabatically alternating between two phase-mismatch values along the propagation path. We discuss in detail how such phase-mismatch switching (PMS) can be employed to achieve QPM of a FWM process, what the requirements are for optimal FWM efficiency, and how the scheme is impacted by nonlinear dispersion as well as optical losses. Additionally, we describe how QPM by PMS can be implemented with a silicon-on-insulator strip waveguide of which the width is adiabatically varied between two values along the propagation path. By means of numerical simulations, we show that such a waveguide can enhance the wavelength conversion by 20 dB after 1 cm compared to a corresponding constant-width waveguide. For a pump wavelength of 1550 nm, PMS enables efficient conversion (＞ -21 dB) around a target signal wavelength situated anywhere in the entire near-infrared wavelength domain of 1300-1900 nm.
机译：非线性四波混合（FWM）相互作用可实现多种光子功能，包括波长转换，全光切换，信号再生和纠缠光子的产生。为了实现有效的FWM交互，必须要么对波进行相位匹配，要么必须实现准相位匹配（QPM）方案。但是，这些技术通常需要具有特定特性的导光介质。我们提出了一种更通用的QPM方案，以在存在较大的相位失配时实现有效的FWM交互。该方案基于增加存在FWM增益的距离，同时减少存在FWM损耗的距离。这是通过沿传播路径在两个相位不匹配值之间进行绝热交替来实现的。我们将详细讨论如何使用这种相位失配切换（PMS）来实现FWM过程的QPM，对最佳FWM效率的要求是什么，以及该方案如何受到非线性色散和光损耗的影响。此外，我们描述了如何使用绝缘体上硅条形波导实现PMS的QPM，其宽度沿传播路径在两个值之间绝热地变化。通过数值模拟，我们表明与相应的等宽波导相比，这种波导在1 cm后可以将波长转换提高20 dB。对于1550 nm的泵浦波长，PMS可以围绕位于1300-1900 nm整个近红外波长域中任何位置的目标信号波长进行有效转换（> -21 dB）。

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