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THz Signal Generator Using a Single DFB Laser Diode and the Unbalanced Optical Fiber Interferometer.

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  • 1Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška Cesta 46, 2000 Maribor, Slovenia.

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Summary
This summary is machine-generated.

This study introduces a novel frequency-modulated optical signal generator for terahertz (THz) applications. The device utilizes a single laser diode and an optical fiber interferometer to produce tunable THz signals efficiently.

Keywords:
THz bandoptical fiber interferometeroptical frequency sweepthe optical signal frequency modulation

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Area of Science:

  • Optoelectronics
  • Terahertz (THz) Technology
  • Laser Physics

Background:

  • Developing efficient frequency-modulated optical signal generators is crucial for advanced THz applications.
  • Existing methods often involve complex setups or limited tunability.
  • A single narrowband laser diode combined with an optical fiber interferometer offers a promising alternative.

Discussion:

  • The proposed method achieves fast optical frequency sweeps by driving a laser diode with high-amplitude current pulses.
  • Modulation frequency is controllable via the optical path difference of the interferometer and the laser diode's sweep rate.
  • Analysis covers Michelson and Fabry-Perot interferometers under varying conditions.

Key Insights:

  • Demonstrated generation of optical chirp signals using programmable current pulse waveforms for nonlinear optical sweep.
  • Experimental validation confirmed signal generation in both microwave (1-30 GHz) and THz (0.1-0.3 THz) bands.
  • The system offers a flexible and efficient approach to THz signal generation.

Outlook:

  • Further optimization of current pulse shaping could enhance sweep rates and bandwidth.
  • Integration into compact THz systems for sensing and communication is a potential future direction.
  • Exploring alternative interferometer designs may lead to improved signal quality and broader frequency coverage.