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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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A semiconductor laser with monolithically integrated dynamic polarization control.

B M Holmes1, M A Naeem, D C Hutchings

  • 1School of Engineering, University of Glasgow, Oakfield Avenue, Glasgow, G12 8LT, UK. barry.holmes@glasgow.ac.uk

Optics Express
|October 6, 2012
PubMed
Summary

We demonstrate the first semiconductor laser with an integrated active polarization controller. This device allows for high-speed polarization modulation using electrical current injection.

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Area of Science:

  • Photonics
  • Semiconductor device physics
  • Optical engineering

Background:

  • Monolithic integration of optical components is crucial for advanced photonic systems.
  • Controlling polarization in semiconductor lasers is essential for various applications, including optical communications and sensing.
  • Existing methods for polarization control often involve bulky external components or complex fabrication processes.

Purpose of the Study:

  • To demonstrate the first monolithic integration of a semiconductor laser with an active polarization controller.
  • To enable high-speed modulation of the laser output polarization.
  • To provide a compact and efficient solution for polarization control in semiconductor lasers.

Main Methods:

  • Fabrication of a semiconductor laser chip incorporating a polarization mode converter and a differential phase shifter.
  • Integration of the polarization controller directly onto the laser gain medium.
  • Utilizing current injection into the phase shifter section for active polarization control.

Main Results:

  • Successful monolithic integration of a semiconductor laser and an active polarization controller.
  • Demonstration of high-speed modulation of the laser output polarization.
  • Achieved polarization control through electrical means, eliminating the need for external optical elements.

Conclusions:

  • The developed device represents a significant advancement in integrated photonics.
  • This technology offers a pathway towards more compact, efficient, and high-speed tunable semiconductor laser sources.
  • The monolithic approach simplifies device architecture and enhances performance for polarization-dependent applications.