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Simulation and Examination for Beam Profile of DFB Laser

  • Journal of Software Assessment and Valuation
  • Abbr : JSAV
  • 2019, 15(1), pp.71-78
  • DOI : 10.29056/jsav.2019.06.08
  • Publisher : Korea Software Assessment and Valuation Society
  • Research Area : Engineering > Computer Science
  • Received : May 31, 2019
  • Accepted : June 20, 2019
  • Published : June 30, 2019

Kwon Kee Young 1 Jang-Geun Ki 1

1공주대학교

Candidate

ABSTRACT

Lasers for optical broadband communication systems should have excellent frequency selectivity and modal stability. DFB lasers have low lasing frequency shift during high speed current modulation. In this paper, we have developed a simulation software and analysed beam profiles of a lasing mode in longitudinal direction of an 1.55um DFB laser with two mirrors and without anti-reflection coatings, that have both an index- and gain-gratings. As the phases of the index and gain gratings on the mirror faces are varied, the beam profiles and of the lasing mode with the emitted power ratio are analysed and examined. In order to reduce the threshold current of a lasing mode and enhance the frequency stability, should be greater than 8, regardless of the grating phases on the mirror faces.

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