Journal of Software Assessment and Valuation (한국소프트웨어감정평가학회 논문지)

Korea Software Assessment and Valuation Society (한국소프트웨어감정평가학회)
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Analysis of Gain and Frequency in a DFB laser with Cleaved Facets

결정 벽개면을 갖는 DFB 레이저의 이득과 주파수 분석

  • 이창석 (한밭대학교 정보통신공학과) ;
  • 권기영 (공주대학교 전기전자제어공학부) ;
  • 기장근 (공주대학교 전기전자제어공학부) ;
  • 조현묵 (공주대학교 전기전자제어공학부)
  • Received : 2020.12.06
  • Accepted : 2020.12.21
  • Published : 2020.12.31
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Abstract

In this paper, when both the refractive index grating and the gain grating exist in a 1.55um DFB laser with two cleaved mirror facets, when the phase of ρl is fixed to 0 and the phase of ρr is changed to -π/2, π, π/2, 0, the change in frequency and oscillation gain was theoretically analyzed. In the case of δL<0, the oscillation gain required for lasing is the lowest and the most stable frequency operation is obtained in the case of (ρl phase=0, ρr phase=0) and κL=10, when κL is varied from 0.1 to 10. In the case of δL>0, when (ρl phase=0, ρr phase=π) and κL=10, the oscillation gain required for lasing is the lowest and the difference between the oscillation gains of the higher-order modes is large so that the most stable frequency operation is obtained.

본 논문에서는 벽개된 두 거울 면을 갖는, 1.55um 파장인 DFB 레이저에서 이득 그레이팅과 굴절률 그레이팅이 함께 존재할 때, 편의상 ρl의 위상=0으로 고정시키고, ρr의 위상을 -π/2, π, π/2, 0인 경우로 변화시킬 때, 발진 주파수와 발진 이득의 변화를 이론적으로 해석하였다. δL<0인 경우, (ρl의 위상=0, ρr의 위상=0)인 경우에, κL을 0.1로부터 10까지 증가시킬 때, 발진하기 위해 요구되는 발진 이득이 가장 낮은 경우는 κL=10인 경우이고, 이때 고차 모드와의 발진 이득의 차이가 커서 가장 안정된 주파수 동작을 얻을 수 있다. δL>0인 경우, (ρl의 위상=0, ρr의 위상=π)인 경우에, κL을 0.1로부터 10까지 증가시킬 때, 발진하기 위해 요구되는 발진 이득이 가장 낮은 경우는 κL=10이고, 이때 고차 모드와의 발진 이득의 차이가 커서 가장 안정된 주파수 동작을 얻을 수 있다.

Keywords

References

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