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Simulation and Examination for DFB Lasers with Grating Phase of π/2 on One Mirror Face

  • Journal of Software Assessment and Valuation
  • Abbr : JSAV
  • 2019, 15(2), pp.101-109
  • DOI : 10.29056/jsav.2019.12.13
  • Publisher : Korea Software Assessment and Valuation Society
  • Research Area : Engineering > Computer Science
  • Received : November 25, 2019
  • Accepted : December 20, 2019
  • Published : December 31, 2019

Kwon Kee Young 1

1공주대학교

Candidate

ABSTRACT

Lasers for optical broadband communication systems should have excellent frequency selectivity and modal stability. DFB(Distributed Feedback) lasers have low lasing frequency shift during high speed current modulation. In this paper, I have developed a simulation software and analysed threshold gain and lasing frequency 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. The grating phase on a left mirror face is fixed as π/2 and the grating phase on a right mirror face is varied. As the phases of the index and gain gratings on the right mirror facet are π and 0,  should be in the range of 2∼6 in order to enhance the frequency stability. In order to reduce the threshold current of a lasing mode,  should be greater than 8, regardless of the grating phases on the mirror faces.

Citation status

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