We demonstrate an ultra-broadband silicon photonic interleaver capable of interleaving and de-interleaving frequency comb lines over a 125 nm bandwidth in the extended C- and L-bands. We use a ring-assisted asymmetric Mach Zehnder interferometer to achieve a flat-top passband response while maintaining a compact device footprint. The device has a 400 GHz free spectral range to divide an optical frequency comb with 200 GHz channel spacing into two output groups, each with a channel spacing of 400 GHz, yielding a potential capacity of 78 total wavelength-division multiplexed channels between 1525 nm and 1650 nm. This device represents an important step towards realizing highly parallel integrated optical links with broadband frequency comb sources within the silicon photonics platform.

中文翻译：

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用于硅光子链路中极端波长缩放的超宽带交织器

我们展示了一种超宽带硅光子交织器，能够在扩展的 C 和 L 波段中在 125 nm 带宽上对频率梳线进行交织和解交织。我们使用环形辅助非对称 Mach Zehnder 干涉仪来实现平顶通带响应，同时保持紧凑的设备占用空间。该器件具有 400 GHz 的自由光谱范围，可将具有 200 GHz 信道间隔的光频梳分成两个输出组，每组具有 400 GHz 的信道间隔，从而产生 78 个总波分复用信道的潜在容量，介于 1525 nm 和1650 纳米。该器件代表了在硅光子学平台内实现具有宽带频率梳源的高度并行集成光链路的重要一步。