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New compact polarization rotator in anisotropic LiNbO3 graded-index waveguide
1Institute of Semiconductor Physics, Siberian Branch Russian Academy of Sciences, Prospect Lavrenteva, 13, Novosibirsk, 630090, Russia. tsarev@.isp.nsc.ru
Optics Express
|June 11, 2008
Summary
A novel compact polarization rotator in a titanium-indiffused lithium niobate (Ti:LiNbO(3)) waveguide was developed. This device enables efficient polarization conversion for integrated optics, crucial for advanced photonic applications.
Area of Science:
- Photonics and Integrated Optics
- Materials Science (Lithium Niobate)
Background:
- Integrated optics rely on efficient manipulation of light polarization.
- Lithium niobate (LiNbO(3)) is a key material for electro-optic devices.
- Anisotropic graded-index waveguides offer unique light-guiding properties.
Purpose of the Study:
- To propose and investigate a new compact polarization rotator.
- To demonstrate polarization conversion in a specific waveguide structure.
- To enable polarization diversity in integrated photonic elements.
Main Methods:
- Utilized a 3D beam propagation method (BPM) for numerical simulation.
- Designed a channel optical waveguide in Y-cut LiNbO(3).
- Investigated a waveguide with a small angle to the Z-axis and a specific index contrast.
Main Results:
- Successfully demonstrated polarization conversion between quasi-TE and quasi-TM modes.
- Achieved conversion along an 8 mm long waveguide with an index contrast of 0.015.
- The device operates efficiently for polarization rotation.
Conclusions:
- The proposed compact polarization rotator is effective for integrated optics.
- This device facilitates polarization diversity in LiNbO(3) based photonic circuits.
- The findings are relevant for advanced optical communication and sensing systems.
