Two-wavelength switching with a 1310nm-QDot DFB laser

A. Hurtado, M. Nami, I. D. Henning, M. J. Adams, L. F. Lester

Research output: Chapter in Book/Report/Conference proceedingConference contribution book


We report a first experimental observation of two-wavelength switching (2WS) and bistability with a 1310nm-Quantum Dot (QDot) Distributed Feedback (DFB) laser subject to external optical injection and operated in reflection. We experimentally demonstrate the switching of the emission wavelength of the QDot laser when an external optical signal is injected into one of the subsidiary longitudinally modes located in the longer wavelength side of the device's lasing mode. Clockwise nonlinear switching and bistability are attained in all cases for both the emitting and the injected mode of the QDot laser as the injection strength is increased. Moreover, very high on-off contrast ratio is measured in the switching (and bistability) transition of the emission mode of the device. We have also analysed the switching properties of the 1310-QDot DFB laser as a function of the applied bias current and the initial wavelength detuning between the wavelengths of the external signal and that of the device's injected mode. In general, wider bistable loops, higher on-off contrast ratio between output states and higher input power requirements for switching are observed as the applied bias and initial detuning are increased. This diversity of switching behaviors obtained with a 1310 QDot DFB laser under external optical injection, added to the theoretically superior properties of nanostructure lasers, offers exciting prospects for novel uses of these devices in all-optical logic and all-optical switching/routing applications in present and future optical telecommunication networks.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 29 May 2013
EventPhysics and Simulation of Optoelectronic Devices XXI - San Francisco, CA, United Kingdom
Duration: 4 Feb 20137 Feb 2013


ConferencePhysics and Simulation of Optoelectronic Devices XXI
Country/TerritoryUnited Kingdom
CitySan Francisco, CA


  • bistability
  • optical Injection
  • quantum dot lasers
  • two wavelength switching
  • distributed feedback lasers
  • optoelectronic devices


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