Linearized electrooptic directional coupler modulator in stoichiometric lithium niobate

John Marsh, Sriram Sriram, Anand Gopinath, Ross Schermer, Jaesang Oh, Stuart Kingsley, Andrea Pollick

Research output: Contribution to journalConference articlepeer-review


This paper reports on a novel optical linearized directional coupler modulator in stoichiometric lithium niobate (SLN). The linearized design has important applications in analog and RF communications systems where fiber optic link performance depends critically on the spurious-free dynamic range of the modulator. Newly available SLN has several distinct advantages over the congruently grown crystals commonly used for high speed integrated optic devices, including higher electrooptic coefficient and better ferroelectric properties. The higher electrooptic coefficient yields lower drive voltage, while the enhanced ferroelectric properties enable better velocity-matched electrode structures using domain inverted waveguides. This paper addresses the operation of the linearized directional coupler design, and the critical advantages of the SLN substrate for implementing high-speed operation using velocity-matching.

Original languageEnglish (US)
Article number16
Pages (from-to)113-119
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 2004
EventPhotonics for Space Environments IX - Denver, CO, United States
Duration: Aug 2 2004Aug 3 2004


  • Directional coupler
  • Electrooptics
  • Linearized modulator
  • Mach-Zehnder
  • Stoichiometric lithium niobate

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