Tunable on-chip optical delay has long been a key target for the research community, as it is the enabling technology behind delay lines, signal retiming and other applications vital to optical signal processing. To date, the field has been limited by high optical losses associated with slow light or delay structures. Here, we present a novel tunable delay line, based on a coupled cavity system exhibiting an electromagnetically induced transparency-like transmission spectrum, with record low loss, around 15 dB/ns. By tuning a single cavity, the delay of the complete structure can be tuned over 120 ps, with the maximum delay approaching 300 ps.

中文翻译：

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通过模拟耦合光子晶体腔中的电磁感应透明度来可调光缓冲器

可调片上光延迟一直以来都是研究界的主要目标，因为它是延迟线，信号重定时和其他对光信号处理至关重要的应用背后的使能技术。迄今为止，该领域已经受到与慢速光或延迟结构相关的高光学损耗的限制。在这里，我们基于耦合腔系统展示了一种新颖的可调谐延迟线，该系统展现了电磁感应的透明性状传输频谱，具有创纪录的低损耗，约为15 dB / ns。通过调谐单个腔，可以将整个结构的延迟调整到120 ps以上，最大延迟接近300 ps。