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High-speed operation of LiNbO3 electro-optic interferometric waveguide modulators.

F J Leonberger1

  • 1Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02173, USA.

Optics Letters
|August 21, 2009
PubMed
Summary

Researchers demonstrate high-speed optical intensity modulation using electro-optic interferometric waveguide modulators. This novel application in lithium niobate achieves modulation rates up to 1.4 GHz for continuous wave optical inputs.

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Area of Science:

  • Photonics
  • Materials Science
  • Electrical Engineering

Background:

  • Optical modulators are crucial for high-speed data transmission.
  • Electro-optic modulators offer fast response times.
  • Lithium niobate (LiNbO3) is a well-established electro-optic material.

Purpose of the Study:

  • To demonstrate high-speed optical intensity modulation.
  • To utilize single-mode electro-optic interferometric waveguide modulators.
  • To investigate modulation capabilities in Ti-diffused LiNbO3 waveguides.

Main Methods:

  • Fabrication of Ti-diffused waveguides in LiNbO3.
  • Construction of single-mode electro-optic interferometric waveguide modulators.
  • Application of continuous wave (cw) 0.633-microm optical inputs.
  • Driving the interferometer through multiple π phase shifts.
  • Modulation of a cw mode-locked frequency-doubled Nd:YAG laser pulse train.

Main Results:

  • Achieved optical intensity modulation at rates up to 1.4 GHz.
  • Demonstrated envelope modulation of a 275-MHz optical pulse train.
  • Utilized a 68.9-MHz drive signal for modulation.

Conclusions:

  • Single-mode electro-optic interferometric waveguide modulators in LiNbO3 enable high-speed optical intensity modulation.
  • The demonstrated modulation rates are significant for optical communication applications.
  • This work presents a novel approach for high-performance optical modulation.