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High-density integrated delay line using extreme skin-depth subwavelength grating waveguides

Journal Article · · Optics Letters
DOI:https://doi.org/10.1364/ol.479003· OSTI ID:2424304

Optical delay lines control the flow of light in time, introducing phase and group delays for engineering interferences and ultrashort pulses. Photonic integration of such optical delay lines is essential for chip-scale lightwave signal processing and pulse control. However, typical photonic delay lines based on long spiral waveguides require extensively large chip footprints, ranging from mm2to cm2scales. Here we present a scalable, high-density integrated delay line using a skin-depth engineered subwavelength grating waveguide, i.e., an extreme skin-depth (eskid) waveguide. The eskid waveguide suppresses the crosstalk between closely spaced waveguides, significantly saving the chip footprint area. Our eskid-based photonic delay line is easily scalable by increasing the number of turns and should improve the photonic chip integration density.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
DOE Contract Number:
NA0003525
OSTI ID:
2424304
Journal Information:
Optics Letters, Journal Name: Optics Letters Journal Issue: 7 Vol. 48; ISSN 0146-9592; ISSN OPLEDP
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English

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