Using the thermoreflectance imaging method, the temperature profile and transient response of thermally tunable ridge waveguides with laterally supported suspension are investigated. This method has a high accuracy in the temperature measurement. The experimental data convincingly confirm a uniform temperature distribution along the waveguide except the initial 30 μm long sections near the two longitudinal edges. The 10%–90% rising time and 90%–10% falling time of the device transient thermal response are also measured to be ∼48 μs and ∼44 μs, respectively, regardless of different waveguide lengths and at different heating powers. In addition, the delay time of the waveguide transient thermal response is revealed to be 1.3 μs by comparison between experiment and simulation.

中文翻译：

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具有横向支撑悬挂的热可调脊形波导的温度分布和瞬态响应

使用热反射成像方法，研究了具有横向支撑悬架的热可调脊形波导的温度分布和瞬态响应。该方法测温精度高。实验数据令人信服地证实了沿波导的均匀温度分布，除了靠近两个纵向边缘的初始 30 μm 长部分。无论波导长度和加热功率如何，器件瞬态热响应的 10%–90% 上升时间和 90%–10% 下降时间也分别测量为 ~48 μs 和 ~44 μs。此外，通过实验和仿真的比较，波导瞬态热响应的延迟时间为 1.3 μs。