Linewidth sharpening via polarization-rotated feedback in optically injected semiconductor laser oscillators

Thomas B. Simpson, Jia Ming Liu, Mohammad Almulla, Nicholas G. Usechak, Vassilios Kovanis

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


Combining optical injection and polarization-rotated optical feedback in a semiconductor laser can induce self-referenced periodic output that is widely tunable by simply varying the dc-bias points of the system's master and slave lasers. We observed a feedback-induced reduction of the fundamental period-one oscillation linewidth by more than two orders of magnitude relative to the injection-only case. Performance was found to be negatively affected by the interference between the external injection signal and the residual feedback in the same polarization. The nonlinear dynamics of the optically injected semiconductor laser can be used to minimize sensitivity to fluctuations in the operating points. However, the use of the nonlinear dynamics at high oscillation frequencies is limited by the decreasing strength of the interaction between the circulating intracavity optical field and the carrier density.

Original languageEnglish
Article number6415240
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number4
Publication statusPublished - 2013


  • Injection locking
  • RF oscillators
  • tunable oscillators

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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