We design and experimentally demonstrate an ultra-compact dual-mode mode-division multiplexing (MDM) photonic integrated circuit (PIC), which supports on-chip optical signal mode-order-based routing and mode-independent broadcasting. The MDM circuit is composed of inverse-designed three multiplexers, one 3-dB power splitter, three bends and one crossing based on photonic-crystal-like subwavelength structure. The measured excess loss and crosstalk of the fabricated MDM circuit are lower than 5.9 dB and −13 dB over a 60 nm observable wavelength span, respectively. The experiment results of single-channel 25 Gbit/s optical signal transmission show that only 1.2-dB power penalty is introduced through the MDM circuit at a bit-error-rate of 10 −9 .

中文翻译：

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基于反设计光子元件的双模光子集成电路演示


我们设计并实验演示了一种超紧凑的双模模分复用（MDM）光子集成电路（PIC），它支持片上光信号基于模式顺序的路由和模式无关的广播。 MDM电路由基于类光子晶体亚波长结构的逆向设计的3个多路复用器、1个3dB功率分配器、3个弯曲和1个交叉组成。在 60 nm 可观测波长范围内，所测量的 MDM 电路的额外损耗和串扰分别低于 5.9 dB 和 -13 dB。单通道25 Gbit/s光信号传输的实验结果表明，在误码率为10 -9 的情况下，通过MDM电路仅引入1.2 dB的功率损失。