Experimental and theoretical investigation of fiber ring laser dynamics and transient analysis

K. Vijayraghavan, G. Stewart

Research output: Contribution to conferencePaper


We report the experimental and theoretical studies on the dynamics of a fiber ring laser system which contains a length of erbium doped fiber pumped at 980nm connected to a fiber loop consisting of a micro-optic gas cell and a tunable bandpass filter. Due to a long loop length ~60m of the system, the number of cavity modes present in the 1nm filter bandwidth is extremely large. As a result, the effect of spontaneous emission into these laser modes plays an important role in determining the dynamics of the laser. A theoretical model which incorporates the effect of spontaneous emission into multiple laser modes is described and it is shown to be in agreement with experimental results obtained. A detailed analysis has been performed on the relaxation oscillations induced during the transient operation of the laser with the aim of using it as a tool for obtaining laser parameters
Original languageEnglish
Number of pages6
Publication statusPublished - 2004
Event7th International Conference on Optoelectronics, Fiber Optics and Photonics - Kerala, India
Duration: 8 Dec 200411 Dec 2004


Conference7th International Conference on Optoelectronics, Fiber Optics and Photonics
Abbreviated titlePhotonics 2004


  • fiber ring laser
  • fiber amplifiers
  • intra-cavity absorption
  • spontaneous emission
  • relaxation oscillations
  • experimental
  • theoretical investigation
  • dynamics
  • transient analysis

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