Cauchon Jonathan, St-Yves Jonathan, Shi Wei
Opt Lett. 2021 Feb 1;46(3):532-535. doi: 10.1364/OL.413142.
Bandwidth-tunable filters are essential in elastic optical networks for dynamic bandwidth allocation. Existing solutions in silicon photonics face challenges to meet requirements in real-world applications due to design trade-offs and fabrication errors. In this Letter, we propose and experimentally demonstrate a silicon photonic tunable add-drop filter in a single-stage, hyperbolic-tangent-apodized contra-directional coupler with a segmented microheater. It allows to create an arbitrary temperature profile along the device for bandwidth tuning in both through and drop responses. We show that the algorithmic operation of the device can effectively compensate local fabrication nonuniformity and improve the out-of-band suppression ratio by 69%. Applying proper temperature offsets and slopes allows to continuously tune the filter's center wavelength over 8 nm and its drop-port 3 dB bandwidth between 14.0 and 22.4 nm.
带宽可调滤波器对于弹性光网络中的动态带宽分配至关重要。由于设计权衡和制造误差，硅光子学中的现有解决方案在满足实际应用需求方面面临挑战。在本信函中，我们提出并通过实验证明了一种硅光子可调谐上下路滤波器，该滤波器采用单级、双曲正切变迹反向定向耦合器和分段微加热器。它允许沿着器件创建任意温度分布，以对直通和下路响应进行带宽调谐。我们表明，该器件的算法操作可以有效补偿局部制造不均匀性，并将带外抑制比提高69%。应用适当的温度偏移和斜率可以使滤波器的中心波长连续调谐超过8 nm，其下路端口的3 dB带宽在14.0至22.4 nm之间。
