We propose and experimentally demonstrate a compact silicon photonic interleaver based on an interfering loop containing a 1D Fabry–Perot (FP) cavity for coarse wavelength division multiplexing (CWDM) applications. The interleaver consists of a directional coupler and a FP cavity designed to minimize the channel crosstalk. Instead of using an off-chip optical circulator, the reflection light of the interleaver can be separated from the input by placing two identical interleavers in a Mach–Zehnder interferometer (MZI) structure for practical applications. We also study the impacts of fabrication errors of the MZI structure. The fabricated device has a footprint of $64\mathrm{\mu m}\times 70\mathrm{\mu m}$ and a channel spacing of $\sim 19\mathrm{nm}$. The maximum crosstalk is $-16\mathrm{dB}$ in a wavelength range from 1508 nm to 1590 nm.

中文翻译：

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基于包含一维法布里-珀罗腔的干扰环路的紧凑型CWDM交织器

我们提出并通过实验证明了一种紧凑的硅光子交织器，该交织器基于一个包含1D Fabry-Perot（FP）腔的干涉回路，适用于粗波分复用（CWDM）应用。交织器由定向耦合器和FP腔组成，FP腔设计用于最大程度地减少通道串扰。代替使用片外光环行器，交织器的反射光可以通过在实际应用中将两个相同的交织器放置在Mach-Zehnder干涉仪（MZI）结构中而与输入分离。我们还研究了MZI结构制造错误的影响。制成的设备的占地面积为$64\mathrm{微米}\times 70\mathrm{微米}$ 通道间距为 $〜19\mathrm{纳米}$。最大串扰为$-16\mathrm{D\; b}$ 在1508nm至1590nm的波长范围内。