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Broadband LiTaO(3) guided-wave TE-TM mode converter.

O Eknoyan, W K Burns, R P Moeller

|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.

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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.