Bandwidth-adaptable silicon photonic differentiator employing a slow light effect

Siqi Yan, Ziwei Cheng, Lars Hagedorn Frandsen, Yunhong Ding, Feng Zhou, Jianji Dong, Xinliang Zhang

Research output: Contribution to journalJournal articleResearchpeer-review


A photonic differentiator (DIFF) plays a crucial role in photonic circuits. Despite the fact that a DIFF having a tera-hertz bandwidth has been reported, the practical bandwidth is limited to being a bandpass response. In this Letter, we propose the concept of a bandwidth-adaptable DIFF, which exploits the slow light effect in a photonic crystal waveguide (PhCW) to overcome the inherent bandwidth limitation of current photonic DIFFs. We fabricated a PhCW Mach-Zehnder interferometer (PhCW-MZI) on the silicon-onisolator material platform to validate our concept. Input Gaussian pulses with full width to half-maximums (FWHMs) ranging from 2.7 to 81.4 ps are accurately differentiated using our PhCW-MZI. Our all-passive scheme circumvents the bandwidth bottlenecks of previously reported photonic DIFFs and can greatly broaden the application area of photonic DIFFs. (C) 2017 Optical Society of America
Original languageEnglish
JournalOptics Letters
Issue number8
Pages (from-to)1596-1599
Publication statusPublished - 2017


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