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Compact Electroabsorption Modulators for Photonic Integrated Circuits, Using an Isolated Pedestal Contact Scheme

Research output: Contribution to journalJournal article


  • Chris L. M. Daunt
  • James O'Callaghan
  • Ko-Hsin Lee
  • Hua Yang
  • Robert J. Young
  • Kevin Thomas
  • Emanuele Pelucchi
  • Brian Corbett
  • Frank H. Peters
Journal publication date1/03/2012
JournalIEEE Photonics Technology Letters
Number of pages3
Original languageEnglish


We demonstrate a shallow ridge waveguide, lumped element electroabsorption modulator (EAM) based on AlInGaAs multiple quantum wells, operating with input powers up to 8 dBm. The device was isolated between two DC controlled sections, using angled etched slots in the waveguide, minimizing optical feedback, while also providing 40-K Omega resistance between devices. The EAM uses a planar isolated pedestal contact with a benzocyclobutene bridge, allowing for a small contact footprint of just 0.024 mm(2), while being suitable for flip-chip packaging. The parasitic capacitance was measured to be 19.6 fF, and the EAM has a f(3dB) bandwidth of 42 GHz.