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Heterogeneously integrated III-V/silicon dual-mode distributed feedback laser array for terahertz generation.

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|December 10, 2014

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This study presents a dual-wavelength distributed feedback laser array for generating narrowband terahertz (THz) signals. The integrated photonic device achieves a stable 0.357 THz carrier signal through optical heterodyning.

Area of Science:

Photonics
Semiconductor Lasers
Terahertz (THz) Technology

Background:

Integrated photonics offers miniaturization and enhanced functionality for optical systems.
Distributed feedback (DFB) lasers are crucial for generating specific wavelengths.
Terahertz (THz) wave generation is essential for various applications, including spectroscopy and imaging.

Purpose of the Study:

To demonstrate an integrated distributed feedback (DFB) laser array as a dual-wavelength source for narrowband terahertz (THz) generation.
To investigate the stability and frequency characteristics of the generated THz signal.
To analyze the influence of operational parameters on THz output.

Main Methods:

Fabrication of a heterogeneously integrated III-V-on-silicon DFB laser array with varying lengths for dual-mode lasing.

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Optical heterodyning of two laser modes using a uni-traveling carrier photodiode (UTC-PD) THz photomixer.

Analysis of the central operating frequency and linewidth of the generated THz signal under different bias currents and temperatures.

Main Results:

Successful demonstration of a dual-wavelength DFB laser array enabling dual-mode lasing.
Generation of a narrow and stable 0.357 THz carrier signal via optical heterodyning.
Characterization of the THz signal's frequency and linewidth, showing tolerance to process variations, bias fluctuations, and temperature changes.

Conclusions:

The integrated DFB laser array serves as a robust dual-wavelength source for narrowband THz generation.
The demonstrated approach offers a stable and tunable THz signal suitable for various applications.
Heterogeneous integration of III-V-on-silicon DFB lasers provides a promising platform for advanced THz photonic systems.