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Related Experiment Video

Updated: Jul 8, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

All-fiber bidirectional passively mode-locked ring laser.

Khanh Kieu1, Masud Mansuripur

  • 1College of Optical Sciences, The University of Arizona, Tucson, Arizona 85721, USA. kk532@cornell.edu

Optics Letters
|December 25, 2007
PubMed
Summary
This summary is machine-generated.

A new all-fiber laser generates two femtosecond pulse trains simultaneously in opposite directions. This bidirectional fiber laser technology shows promise for advanced precision rotation sensing applications.

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Last Updated: Jul 8, 2026

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Fiber lasers offer compact and robust platforms for generating ultrashort pulses.
  • Bidirectional operation in lasers can lead to unique phenomena and applications, such as rotation sensing.

Purpose of the Study:

  • To design and demonstrate a novel all-fiber bidirectional passively mode-locked ring laser.
  • To investigate the potential of this laser for precision rotation sensing.

Main Methods:

  • Utilized an erbium-doped fiber as the gain medium in a ring cavity.
  • Incorporated a fiber taper embedded in a carbon nanotubes/polymer composite as a saturable absorber for bidirectional mode locking.
  • Measured the beat note between counter-propagating pulses using a photodetector.

Main Results:

  • Successfully achieved stable femtosecond pulse generation in both directions.
  • Observed a beat note of approximately 2 MHz with a narrow bandwidth (< 2 kHz) between the counter-propagating pulses.
  • Demonstrated the feasibility of bidirectional mode locking using a novel saturable absorber.

Conclusions:

  • The developed all-fiber bidirectional laser is a significant advancement in laser technology.
  • The unique characteristics of this laser suggest strong potential for high-precision rotation sensing applications.