We present a ${\mathrm{Ge}}_2{\mathrm{Sb}}_2{\mathrm{Te}}_5$ (GST)-integrated ring resonator with the tuning enabled by an all-optical phase change of GST using a sequence of optical pulses. The tuning is non-volatile and repeatable, with no static power consumption due to the “self-holding” feature of the GST phase-change material. The 2 μm long GST can be partially crystallized by controlling the number of pulses, increasing the tuning freedom. The coupling between the ring resonator and the bus waveguide is based on an asymmetric Mach–Zehnder interferometer. The coupling strength is wavelength-dependent, so that an optimal wavelength can be selected for the probe light to get more than 20 dB transmission contrast between the amorphous and crystalline GST states.

中文翻译：

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具有GST相变材料的AMZI耦合环形谐振器的全光非易失性调谐

我们提出一个 ${\mathrm{通用电器}}_{\mathrm{2个}}{锑}_{\mathrm{2个}}{特}_5$（GST）集成环形谐振器，通过使用一系列光脉冲对GST进行全光学相变，可以进行调谐。由于GST相变材料的“自保持”功能，该调谐是非易失性且可重复的，没有静态功耗。通过控制脉冲数，可以使2μm长的GST部分结晶，从而增加了调谐的自由度。环形谐振器和总线波导之间的耦合基于非对称的Mach–Zehnder干涉仪。耦合强度取决于波长，因此可以为探测光选择最佳波长，以在非晶态和结晶态的GST状态之间获得超过20 dB的透射对比度。