Numerical Analysis of the Threshold Pu-mping Power and Threshold Gain of Er-Doped λ/4-Phase Shited DFB Fiber Laser

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Abstract

In this paper the threshold characteristics of an Er-doped λ/4 phase-shifted DFB fiber laser have been studied theoretically. The main purpose of this analysis is to investigate the dependence of threshold pump power and threshold gain on the coupling coefficient. The numerical results show that threshold pump power and threshold gain of Er-doped DFB fiber laser decreas with increasing the normalized coupling coefficient, κL. In this paper the gain margin of laser, the threshold gain difference between the main and side modes, has been evaluated. The obtained results show that the gain margin decreases with increasing of κL. The gain margin is a single mode operation norm of laser. As a result, grating and coupling coefficient have important role in designing the DFB fiber lasers. Numerical ca-lculations have been done by solving the rate equation and coupled wave equations simultaneously using tra-nsfer matrix method

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References

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History

  • Receive Date: 12 October 2011
  • Revise Date: 28 August 2011
  • Accept Date: 11 February 2012

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