On-chip tunable photonic delay line

Xingchen Ji, Xinwen Yao, Yu Gan, Aseema Mohanty, Mohammad A. Tadayon, Christine P. Hendon, Michal Lipson

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

An on-chip tunable photonic delay line is a key building block for applications including sensing, imaging, and optical communication. However, achieving long and tunable delay lines within a small footprint remains challenging. Here, we demonstrate an on-chip tunable photonic delay line using ultralow loss high confinement Si3N4 waveguides with integrated microheaters. As an example of potential application, we embed a 0.4 m delay line within an optical coherence tomography (OCT) system. We show that the delay line can extend the OCT imaging range by 0.6 mm while maintaining a high signal to noise ratio. Our tunable photonic delay line is achieved without any moving parts which could provide high stability, critical for interference based applications.

Original languageEnglish
Article number090803
JournalAPL Photonics
Volume4
Issue number9
DOIs
StatePublished - 9 Sep 2019

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