Spiral waveguide Bragg grating modulator on thin-film Z-cut lithium niobate

Amr O. Ghoname, Ahmed E. Hassanien, Edmond Chow, Lynford L. Goddard, Songbin Gong

Research output: Contribution to journalArticlepeer-review

Abstract

Next-generation photonic integrated circuits require compact electro-optic modulators (EOMs) that achieve high performance and efficient use of the on-chip area simultaneously. We demonstrate a compact EOM based on a spiral-shaped waveguide Bragg grating on thin-film lithium niobate. The modulator utilizes the grating's optical filter characteristics along with electro-optic tuning of the central Bragg wavelength to achieve simple and efficient intensity modulation. The spiral Bragg gratings were realized on Z-cut lithium niobate and modulated using top and bottom electrodes. The integrated design wrapped a 2.2 mm long grating into a 120×120 μm2 area. The modulator bandgap, with an extinction ratio of over 35 dB at 1550 nm, could be efficiently tuned with a sensitivity of 8.36 pm/V and a 3 dB operating bandwidth of 25 GHz.

Original languageEnglish (US)
Pages (from-to)D38-D43
JournalJournal of the Optical Society of America B: Optical Physics
Volume40
Issue number5
DOIs
StatePublished - May 2023

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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