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Cascaded sum-frequency generation and electro-optic polarization coupling in the PPLNOI ridge waveguide
Optics Express
|June 6, 2019
Summary
Simultaneous sum-frequency generation and electro-optic polarization coupling were achieved in a PPLNOI ridge waveguide. This enables electric field control of nonlinear frequency conversion for optical processing and communication.
Area of Science:
- Photonics and Nonlinear Optics
- Materials Science
Background:
- Nonlinear frequency conversion is crucial for optical signal processing.
- Controlling nonlinear processes with electric fields offers advanced functionalities.
- Lithium niobate on insulator (LNOI) platforms are promising for integrated photonics.
Purpose of the Study:
- To demonstrate simultaneous quasi-phase matched sum-frequency generation (SFG) and electro-optic (EO) polarization coupling.
- To enable electric field modulation of nonlinear frequency conversion on an LNOI platform.
- To enhance frequency conversion efficiency and reduce driving voltage.
Main Methods:
- Utilizing a periodically poled lithium niobate on insulator (PPLNOI) ridge waveguide.
- Implementing a cascading process for SFG.
- Applying a transverse electric field to modulate the optical signal.
Main Results:
- Simultaneous SFG and EO polarization coupling achieved.
- Intensity of sum-frequency conversion modulated by an applied electric field.
- Ridge waveguide structure reduced driving voltage and enhanced conversion efficiency.
Conclusions:
- A novel scheme for electric field control of nonlinear frequency conversion on LNOI is proposed.
- The integrated and fast-modulation capabilities are suitable for nonlinear optical processing and communication applications.
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