Theoretical analysis of a feedback insensitive semiconductor ring laser using weak intracavity isolation

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Abstract

External optical feedback can severely deteriorate the performance of semiconductor lasers. This paper proposes an integrated laser design that can withstand tens of percent of off-chip feedback, without requiring the integration of magneto-optic materials. The proposed laser consists of a ring cavity with a weak intracavity optical isolator. Sufficient gain difference between clockwise and counter-clockwise modes leads to unidirectional laser oscillation. Any reflected light is returned to a mode that is below threshold. This significantly reduces interactions between the feedback and the lasing mode. A rate-equation analysis is presented to show that the rin changes less than a factor 2 when less than -0.1 dB of the light is fed back into the laser and when intracavity isolation is 10 dB. Linewidth and optical output power change approximately 0.1% for these values.
Original languageEnglish
Article number1800108
Number of pages8
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume24
Issue number1
Early online date28 Jun 2017
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Ring lasers
  • optical feedback
  • photonic integrated circuits
  • rate equation modelling
  • semiconductor lasers

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