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has been cited by the following article:

• TITLE: Nonlinear Dynamics in Directly Modulated Semiconductor Lasers with Optical Loop Mirror Feedback

  AUTHORS: Hani J. Kbashi

  KEYWORDS: Nonlinear Dynamics; Nonlinear Loop Mirror; Pulse Multiplication; Optical Chaotic; And Pulse Mode Locking

  JOURNAL NAME: Optics and Photonics Journal, Vol.2 No.4, December 28, 2012

  ABSTRACT: The investigation of the nonlinear dynamics of a semiconductor laser based on nonlinear optical loop mirror (NOLM) feedback using Ge doped optical fiber was carried out experimentally. Animations of compilations of the output power as a function of time series and phase plane with effects of optical feedback level, carrier current and modulation signal strength are demonstrated as a tool to give insight into the laser dynamics. Different dynamic states, including 2×, 4× multiplication and quasi-periodic and periodic frequency-locked pulsing states extended to chaotic behaviour were observed by varying the parameters of modulated frequency and optical feedback strength. The frequency-locked pulsing states were observed to exhibit a harmonic frequency-locking phenomenon and the pulsing frequency is locked to a harmonic nonlinearity in loop instead of the modulated frequency.