Resonantly enhanced nonreciprocal silicon Brillouin amplifier
Resonantly enhanced nonreciprocal silicon Brillouin amplifier
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DOI：
10.1364/optica.6.001117
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发表时间：
2019-03
期刊：
影响因子：
10.4
通讯作者：
N. Otterstrom;E. Kittlaus;S. Gertler;R. Behunin;A. Lentine;P. Rakich
中科院分区：
文献类型：
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作者：
N. Otterstrom;E. Kittlaus;S. Gertler;R. Behunin;A. Lentine;P. Rakich
在硅波导内放大光的能力是高性能硅光子器件技术开发的核心。为此，通过受激布里渊散射实现的大光学非线性为高能效全硅放大器提供了一条有前途的途径，最近的演示产生了数dB的净放大。然而，将放大程度扩展到技术上令人信服的水平（>10 dB）仍然是一个重要的目标，这对于从滤波到小信号检测的一切都是必需的。在这里，我们通过利用多空间模式硅跑道谐振器内的模间布里渊相互作用来显着增强布里渊放大过程。使用这种方法，我们在硅中展示了超过 20 dB 的净布里渊放大，将最先进的性能提高了 30 倍。这种放大程度是通过适度的 (~15 mW) 连续波泵浦功率实现的，并产生较低的带外噪声。此外，我们还表明，该系统充当单向放大器，在全硅平台中提供超过 28 dB 的光学非互易性，而没有插入损耗。基于这些结果，该设备概念为新型全硅注入锁定布里渊激光器、高性能光子滤波器和波导兼容的分布式光机械现象打开了大门。
The ability to amplify light within silicon waveguides is central to the development of high-performance silicon photonic device technologies. To this end, the large optical nonlinearities made possible through stimulated Brillouin scattering offer a promising avenue for power-efficient all-silicon amplifiers, with recent demonstrations producing several dB of net amplification. However, scaling the degree of amplification to technologically compelling levels (>10 dB), necessary for everything from filtering to small signal detection, remains an important goal. Here, we significantly enhance the Brillouin amplification process by harnessing an inter-modal Brillouin interaction within a multi-spatial-mode silicon racetrack resonator. Using this approach, we demonstrate more than 20 dB of net Brillouin amplification in silicon, advancing state-of-the-art performance by a factor of 30. This degree of amplification is achieved with modest (~15 mW) continuous-wave pump powers and produces low out-of-band noise. Moreover, we show that this same system behaves as a unidirectional amplifier, providing more than 28 dB of optical nonreciprocity without insertion loss in an all-silicon platform. Building on these results, this device concept opens the door to new types of all-silicon injection-locked Brillouin lasers, high-performance photonic filters, and waveguide-compatible distributed optomechanical phenomena.