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In-line rotation sensor based on VCSEL behavior under polarization-rotating optical feedback.

Shogo Ura1, Shinichiro Shoda, Kenzo Nishio

  • 1Department of Electronics, Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan. ura@kit.ac.jp

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Summary

Researchers observed changes in a vertical-cavity surface-emitting laser's (VCSEL) polarization modes when optical feedback was rotated. This behavior enables a novel in-line rotation sensor, demonstrating its practical application.

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Area of Science:

  • Optoelectronics
  • Photonics
  • Sensor Technology

Background:

  • Vertical-cavity surface-emitting lasers (VCSELs) are crucial optoelectronic devices.
  • Understanding VCSEL polarization dynamics under external feedback is essential for device applications.
  • Optical feedback significantly influences laser characteristics, including polarization behavior.

Purpose of the Study:

  • To investigate the lasing behavior of a single-transverse-mode VCSEL subjected to rotated optical feedback.
  • To explore the relationship between optical feedback polarization and VCSEL output power.
  • To propose and demonstrate a novel in-line rotation sensor based on observed VCSEL behavior.

Main Methods:

  • Rotated optical feedback applied to a single-transverse-mode VCSEL.
  • Monitored optical power variations of the two dominant polarization modes.
  • Analyzed the dependence of power variation on the polarization rotation angle and feedback ratio.
  • Constructed and tested an in-line rotation sensor prototype.

Main Results:

  • VCSEL polarization modes exhibited sinusoidal power variations with respect to the polarization rotation angle.
  • Power variations were observable for optical feedback ratios greater than -20 dB.
  • A sudden drop in variation depth occurred below a feedback ratio of -25 dB.
  • The proposed in-line rotation sensor's detection principle was successfully demonstrated.

Conclusions:

  • The polarization direction of optical feedback critically affects VCSEL lasing behavior.
  • VCSELs can be utilized as sensitive elements in rotation sensors.
  • The demonstrated sensor offers a new method for rotation detection based on optoelectronic principles.