On-chip transformation optics for multimode waveguide bends
On-chip transformation optics for multimode waveguide bends
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DOI：
10.1038/ncomms2232
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发表时间：
2012-11-01
影响因子：
16.6
通讯作者：
Lipson, Michal
中科院分区：
文献类型：
--
作者：
Gabrielli, Lucas H.;Liu, David;Lipson, Michal
目前的光通信系统几乎完全依靠多模光纤进行中短途传输，现在正在扩展到长途领域。基于在多模系统中对数据通道进行空间多路复用的能力，超高带宽应用是这种扩展的主要驱动力。另一方面，集成光子学，尽管在很大程度上要对今天的电信负责，但仍然几乎严格地在单模制度下运行。这是因为在没有显著的模式间耦合的情况下，多模波导不能在芯片上紧凑地布线，这会降低其数据速率，并阻止使用模式多路复用。在这里，我们提出了一个具有最小模间耦合的片上多模器件平台，为集成多模光学开辟了可能性。我们的工作结合了一种新的理论方法-变换光学的大规模逆设计，以在制造限制的范围内最大限度地提高性能-与典型器件的独特灰度光刻制造相结合：低串扰多模波导弯曲。
Current optical communication systems rely almost exclusively on multimode fibres for short- and medium-haul transmissions, and are now expanding into the long-haul arena. Ultra-high bandwidth applications are the main drive for this expansion, based on the ability to spatially multiplex data channels in multimode systems. Integrated photonics, on the other hand, although largely responsible for today's telecommunications, continues to operate almost strictly in the single-mode regime. This is because multimode waveguides cannot be compactly routed on-chip without significant inter-mode coupling, which impairs their data rate and prevents the use of modal multiplexing. Here we propose a platform for on-chip multimode devices with minimal inter-mode coupling, opening up the possibilities for integrated multimode optics. Our work combines a novel theoretical approach-large-scale inverse design of transformation optics to maximize performance within fabrication constraints-with unique grayscale-lithography fabrication of an exemplary device: a low-crosstalk multimode waveguide bend.