Mutually delay-coupled semiconductor lasers: mode bifurcation scenarios

H Erzgraber, D Lenstra, B Krauskopf, E Wille, M Peil, I Fischer, W Elsasser

Research output: Working paperWorking paper and Preprints

57 Citations (Scopus)
251 Downloads (Pure)


We study the spectral and dynamical behavior of two identical, mutually delay-coupled semiconductor lasers. We concentrate on the short coupling-time regime where the number of basic states of the system, the compound laser modes (CLMs), is small so that their individual behavior can be studied both experimentally and theoretically. Specifically, for small spectral detuning we find several stable CLMs of the coupled system where both lasers lock onto a common frequency and emit continuous wave output. A bifurcation analysis of the CLMs in the full rate equation model with delay reveals the structure of stable and unstable CLMs that are organized by saddle-node and pitchfork bifurcations. We find a characteristic bifurcation scenario as a function of the detuning and the coupling phase between the two lasers that explains experimentally observed multistabilities and mode jumps in the locking region.
Original languageEnglish
Publication statusUnpublished - 2004

Bibliographical note

Additional information: Preprint submitted to Elsevier Science

Sponsorship: The authors thank Nortel Networks for providing the excellent DFB lasers.


  • coupled semiconductor lasers
  • bifurcation analysis
  • delay-instabilities

Fingerprint Dive into the research topics of 'Mutually delay-coupled semiconductor lasers: mode bifurcation scenarios'. Together they form a unique fingerprint.

Cite this