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Broadband LiTaO(3) guided-wave TE-TM mode converter
Applied Optics
|June 5, 2010
Summary
Researchers demonstrated a highly efficient guided-wave TE to TM mode converter in Lithium Tantalate (LiTaO3). This device offers a wider optical bandwidth and improved performance compared to Lithium Niobate (LiNbO3) devices.
Area of Science:
- Photonics
- Materials Science
- Optical Engineering
Background:
- Guided-wave optics is crucial for integrated photonic devices.
- Efficient mode conversion between transverse electric (TE) and transverse magnetic (TM) polarizations is essential for various photonic applications.
- Lithium Tantalate (LiTaO3) is a material with electro-optic properties suitable for such devices.
Purpose of the Study:
- To demonstrate a guided-wave TE to TM mode converter using LiTaO3.
- To investigate the advantages of LiTaO3 over LiNbO3 for mode conversion.
- To achieve high conversion efficiency and optical bandwidth.
Main Methods:
- Utilized Bragg scattering of an electrooptically induced wave of off-diagonal polarizability to couple TE and TM modes.
- Employed a novel electrode structure for a four-phase drive with only two applied voltages.
- Fabricated the device on a LiTaO3 substrate.
Main Results:
- Achieved a 95% TE-TM mode conversion efficiency.
- Demonstrated a 103-Å optical bandwidth.
- Observed that LiTaO3 offers a larger phase match period and optical bandwidth due to its smaller birefringence compared to LiNbO3.
- Operation as a frequency shifter was limited by fringing fields, resulting in low conversion efficiencies.
Conclusions:
- The demonstrated LiTaO3 guided-wave mode converter is highly efficient and offers a broad optical bandwidth.
- LiTaO3 presents advantages over LiNbO3 for this type of photonic device.
- The novel electrode structure enables efficient device operation.
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