Journal
APL PHOTONICS
Volume 4, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5111164
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Funding
- National Science Foundation [NNCI-1542081]
- China Scholarship Council
- Defense Advanced Research Projects Agency (DARPA) [N66001-16-1-4052]
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-1-0303]
- National Institutes of Health (NIH) [1DP2HL127776-01]
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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.
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