We demonstrate acousto-optic modulation of a fiber Bragg grating in a birefringent suspended core fiber up to frequencies of 5.2 MHz for the first time. At acoustic resonances lower than 820 kHz, the reflectivity of the orthogonal polarization modes is electrically switched to a superposed reflection band with a maximum modulation depth of 51% at 10 V. The wavelength peak of the polarization modes is dynamically shifted by tuning the driven electrical signal from 1.92 to 5.2 MHz. A novel side-coupled based acousto-optic device is demonstrated, indicating new possibilities for ultracompact, fast and efficient all-fiber integrated devices.

中文翻译：

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悬置芯光纤布拉格光栅的高效侧面耦合声光调制


我们首次演示了频率高达 5.2 MHz 的双折射悬芯光纤中光纤布拉格光栅的声光调制。在低于 820 kHz 的声共振下，正交偏振模式的反射率被电切换到叠加反射带，在 10 V 时最大调制深度为 51%。通过调节驱动电，偏振模式的波长峰值可动态移动。信号从 1.92 到 5.2 MHz。展示了一种新颖的基于侧耦合的声光器件，这表明超紧凑、快速且高效的全光纤集成器件的新可能性。