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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

|February 21, 2012

Summary

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.

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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.