Subwavelength grating enabled on-chip ultra-compact optical true time delay line

Junjia Wang, Reza Asharfi, Rhys Adams, Ivan Glesk, Ivana Gasulla, José Capmany, Lawrence R. Chen

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

An optical true time delay line (OTTDL) is a basic photonic building block that enables many microwave photonic and optical processing operations. The conventional design for an integrated OTTDL that is based on spatial diversity uses a length-variable waveguide array to create the optical time delays, which can introduce complexities in the integrated circuit design. Here we report the first ever demonstration of an integrated index-variable OTTDL that exploits spatial diversity in an equal length waveguide array. The approach uses subwavelength grating waveguides in silicon-on-insulator (SOI), which enables the realization of OTTDLs having a simple geometry and that occupy a compact chip area. Moreover, compared to conventional wavelength-variable delay lines with a few THz operation bandwidth, our index-variable OTTDL has an extremely broad operation bandwidth practically exceeding several tens of THz, which supports operation for various input optical signals with broad ranges of central wavelength and bandwidth.
LanguageEnglish
Article number30235
Number of pages10
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 26 Jul 2016

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Electric delay lines
delay lines
Time delay
time lag
chips
gratings
Waveguides
waveguides
bandwidth
Bandwidth
Photonics
photonics
Wavelength
wavelengths
integrated circuits
optical communication
Demonstrations
Microwaves
insulators
microwaves

Keywords

  • SWG waveguide
  • optical delay lines
  • integrated tuneable delay
  • optical true time delay lines
  • chip area
  • subwavelength grating
  • subwavelength grating waveguide
  • silicon-on-insulator
  • photonic

Cite this

Wang, J., Asharfi, R., Adams, R., Glesk, I., Gasulla, I., Capmany, J., & Chen, L. R. (2016). Subwavelength grating enabled on-chip ultra-compact optical true time delay line. Scientific Reports, 6, [30235]. https://doi.org/10.1038/srep30235
Wang, Junjia ; Asharfi, Reza ; Adams, Rhys ; Glesk, Ivan ; Gasulla, Ivana ; Capmany, José ; Chen, Lawrence R. / Subwavelength grating enabled on-chip ultra-compact optical true time delay line. In: Scientific Reports. 2016 ; Vol. 6.
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Subwavelength grating enabled on-chip ultra-compact optical true time delay line. / Wang, Junjia; Asharfi, Reza; Adams, Rhys; Glesk, Ivan; Gasulla, Ivana; Capmany, José; Chen, Lawrence R.

In: Scientific Reports, Vol. 6, 30235, 26.07.2016.

Research output: Contribution to journalArticle

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AU - Asharfi, Reza

AU - Adams, Rhys

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AU - Capmany, José

AU - Chen, Lawrence R.

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