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Single-frequency Brillouin distributed feedback fiber laser.

Kazi S Abedin1, Paul S Westbrook, Jeffrey W Nicholson

  • 1OFS Laboratories, Somerset, New Jersey 08873, USA. kabedin@ofsoptics.com

Optics Letters
|February 21, 2012
PubMed
Summary
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We developed a single-frequency Brillouin distributed feedback laser (DFB) with a 27% conversion efficiency. This novel DFB laser allows for tunable output in either forward or backward directions, enhancing its versatility.

Area of Science:

  • Photonics
  • Laser Physics
  • Fiber Optics

Background:

  • Brillouin distributed feedback (DFB) lasers are crucial for various applications requiring narrow linewidth light sources.
  • Controlling the output direction and optimizing efficiency in DFB lasers remain areas of active research.

Purpose of the Study:

  • To demonstrate a single-frequency Brillouin distributed feedback laser.
  • To investigate the impact of a π-phase shift on laser performance and output directionality.

Main Methods:

  • Fabrication of a 12.4 cm long fiber Bragg grating with a central π-phase shift.
  • Characterization of the laser's threshold, conversion efficiency, and higher-order Stokes wave suppression.
  • Analysis of output directionality by altering the phase shift orientation relative to the pump.

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Main Results:

  • Achieved a low threshold of 30 mW and a high pump-to-Stokes conversion efficiency of up to 27%.
  • Suppressed higher-order Stokes waves by over 20 dB.
  • Demonstrated bidirectional Stokes output by simply reorienting the phase shift.
  • Observed stable operation over a 1.2 GHz pump frequency range, significantly exceeding the SBS gain bandwidth.

Conclusions:

  • The developed Brillouin DFB laser offers high efficiency and tunable output directionality.
  • The π-phase shift is key to achieving single-frequency operation and controlling output direction.
  • The wide operating frequency range makes this laser suitable for diverse photonic applications.