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Jitter reduction by intracavity active phase modulation in a mode-locked semiconductor laser.

Sarper Ozharar1, Ibrahim Ozdur, Franklyn Quinlan

  • 1The College of Optics and Photonics, University of Central Florida, Orlando, FL 32816, USA. sozharar@creol.ucf.edu

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Researchers reduced timing jitter in a mode-locked laser by 50% using intracavity phase modulation. This experimental verification confirms theoretical predictions for improved laser pulse stability.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Quantum Electronics

Background:

  • Timing jitter in mode-locked lasers degrades pulse train stability.
  • Theoretical models, such as Haus et al.'s, explain jitter effects.
  • Intracavity phase modulation is a potential method for jitter reduction.

Purpose of the Study:

  • To experimentally verify the theory of timing jitter effects.
  • To investigate the efficacy of intracavity phase modulation for jitter reduction.
  • To quantify the jitter reduction achieved on a high-frequency mode-locked laser.

Main Methods:

  • Utilized active intracavity phase modulation.
  • Employed a 10.24 GHz mode-locked diode laser.
  • Solved the Heisenberg-Langevin equation considering dispersion and phase modulation.

Main Results:

  • Achieved a 50% reduction in timing jitter.
  • Reduced timing jitter from 304 fs to 150 fs.
  • Integrated jitter from 1 Hz to the Nyquist frequency of 5.12 GHz.

Conclusions:

  • Experimental results validate the theoretical framework for timing jitter.
  • Active intracavity phase modulation effectively suppresses timing jitter.
  • Demonstrated a practical method for enhancing the stability of mode-locked laser pulse trains.