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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Nonlinear Optics

Background:

  • Distributed Bragg reflector (DBR) lasers are crucial for integrated photonics.
  • Understanding optical coupling is vital for advanced laser functionalities.
  • On-chip amplification introduces complex nonlinear interactions.

Purpose of the Study:

  • To experimentally investigate nonlinear optical coupling effects.
  • To study these effects in an ultra-short coupling regime.
  • To analyze amplified feedback via a common on-chip optical amplifier.

Main Methods:

  • Fabrication of a DBR laser pair on a single chip.
  • Introduction of optical coupling using back reflection from a cleaved fiber.
  • Amplification of optical feedback through a double pass in a common on-chip optical amplifier.
  • Variable coupling strength by adjusting fiber distance.

Main Results:

  • Observed nonlinear effects characteristic of mutual optical coupling.
  • Demonstrated an ultra-short coupling regime.
  • Showcased amplified feedback leading to further nonlinear phenomena.
  • Achieved controllable coupling strength without significant impact on coupling time.

Conclusions:

  • The study successfully demonstrates controllable nonlinear optical coupling in a DBR laser pair.
  • The findings highlight the potential for novel functionalities in integrated photonic devices.
  • The experimental setup provides a platform for exploring complex light-matter interactions in coupled laser systems.