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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22503–22516

Square-wave oscillations in semiconductor ring lasers with delayed optical feedback

Lilia Mashal, Guy Van der Sande, Lendert Gelens, Jan Danckaert, and Guy Verschaffelt  »View Author Affiliations

Optics Express, Vol. 20, Issue 20, pp. 22503-22516 (2012)

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We analyze experimentally and theoretically the effects of delayed optical cross-feedback in semiconductor ring lasers. We show that under appropriate conditions, feeding of only one directional mode back into the counter-propagating mode leads to square-wave oscillations. In this regime, the laser switches regularly between the two counter-propagating modes with a period close to twice the roundtrip time in the external feedback loop. We find that these oscillations are robust and appear for a wide range of parameters as long as a small asymmetry in the linear coupling between both modes is present. We show that by increasing the feedback strength or the injection current, the square-wave oscillations gradually disappear. Due to noise, mode-hopping between stable lasing in one directional mode and square wave oscillations is observed in this transition region.

© 2012 OSA

OCIS Codes
(140.1540) Lasers and laser optics : Chaos
(140.3560) Lasers and laser optics : Lasers, ring
(140.5960) Lasers and laser optics : Semiconductor lasers

ToC Category:
Lasers and Laser Optics

Original Manuscript: May 16, 2012
Revised Manuscript: July 27, 2012
Manuscript Accepted: September 12, 2012
Published: September 17, 2012

Lilia Mashal, Guy Van der Sande, Lendert Gelens, Jan Danckaert, and Guy Verschaffelt, "Square-wave oscillations in semiconductor ring lasers with delayed optical feedback," Opt. Express 20, 22503-22516 (2012)

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