Brillouin-based phase shifter in a silicon waveguide
Brillouin-based phase shifter in a silicon waveguide
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DOI：
10.1364/optica.6.000907
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发表时间：
2019-03
期刊：
影响因子：
10.4
通讯作者：
L. McKay;M. Merklein;A. C. Bedoya;A. Choudhary;Micah Jenkins;C. Middleton;A. Cramer;Joseph Devenport;A. Klee;R. DeSalvo;B. Eggleton
中科院分区：
文献类型：
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作者：
L. McKay;M. Merklein;A. C. Bedoya;A. Choudhary;Micah Jenkins;C. Middleton;A. Cramer;Joseph Devenport;A. Klee;R. DeSalvo;B. Eggleton
集成硅微波光子学在微波移相器元件方面具有巨大的潜力，并有望实现不受电磁干扰的紧凑和可扩展的多元芯片。最近在硅中发现的受激布里渊散射，由于其固有的灵活性，是一种特别有效的相移诱导方法，提供了一种光学可控和选择性的相移。然而，到目前为止，只实现了适度的布里渊增益，理论上这将把相移限制在几十度，远远低于所需的360度。在这里，我们用一种使用射频干涉的相位增强方法克服了这一限制，展示了一种基于悬浮硅波导中布里渊散射的360度宽带移相器。我们使用25的相位增强因子在15 GHz的带宽上实现了完全的360度相移，从而使实用的宽带布里渊移相器能够用于波束形成和其他应用。
Integrated silicon microwave photonics offers great potential in microwave phase shifter elements, and promises compact and scalable multi-element chips that are free from electromagnetic interference. Stimulated Brillouin scattering, which was recently demonstrated in silicon, is a particularly powerful approach to induce a phase shift due to its inherent flexibility, offering an optically controllable and selective phase shift. However, to date, only moderate amounts of Brillouin gain has been achieved and theoretically this would restrict the phase shift to a few tens of degrees, significantly less than the required 360 degrees. Here, we overcome this limitation with a phase enhancement method using RF interference, showing a 360 degrees broadband phase shifter based on Brillouin scattering in a suspended silicon waveguide. We achieve a full 360 degrees phase-shift over a bandwidth of 15 GHz using a phase enhancement factor of 25, thereby enabling practical broadband Brillouin phase shifter for beam forming and other applications.