The Journal of the Convergence on Culture Technology (문화기술의 융합)

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Lasing mode and Beam Profile Analysis of DFB Laser with an Anti-reflection Coated Mirror

무반사 면을 갖는 DFB 레이저의 발진 모드와 빔 분포 해석

  • Kwon, Keeyoung (Division of Electrical, Electronic and Control Engineering, Kongju National University)
  • 권기영 (공주대학교 전기전자제어공학부)
  • Received : 2020.08.11
  • Accepted : 2020.09.03
  • Published : 2020.11.30
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Abstract

In this paper, when a refractive index grating and a gain grating were simultaneously present in a DFB laser having a wavelength of 1.55 ㎛, a dielectric film coating was applied so that reflection did not occur on the right mirror surface, so that 𝜌r=0. In case of δL > 0, the threshold gain and the beam distribution in the longitudinal direction and the radiated power ratio Pl/Pr of the oscillation mode were compared for the cases of the phase of 𝜌l=π and π/2. If the phase of 𝜌l=π, in order to obtain a low threshold current and high frequency stability, κL should be greater than 8. In the case of the phase of 𝜌l= π/2, when κL is larger than 4.0, the oscillation gain starts to be lower than when the phase of 𝜌l=π. In order to lower the threshold current of a oscillation mode and enhance the frequency stability, κL should be greater than 8.

본 연구에서는 1.55um의 파장을 갖는 DFB 레이저에서 굴절률 격자와 이득 격자가 동시에 존재할 때, 오른쪽 거울 면에 반사가 일어나지 않도록 유전막 코팅을 하여 𝜌r=0 이 되도록 하였다. δL > 0인 경우일 때, 문턱에서 발진 모드에 대하여, 발진 이득과 종 방향으로의 발진 모드의 빔 분포와 방사전력비 Pl/Pr를 𝜌l의 위상=π인 경우와 𝜌l의 위상=π/2인 경우에 대하여 비교했다. 𝜌l의 위상=π인 경우, 낮은 문턱 전류와 높은 주파수 안정성을 얻기 위해서는, κL이 8보다 커야 한다. 𝜌l의 위상=π/2인 경우, κL = 4보다 커지면서 𝜌l의 위상=π인 경우보다 발진 이득이 낮아지기 시작함을 볼 수 있고, 발진 모드의 문턱 전류를 낮추고 주파수 안정성을 높이기 위해서는, κL이 8보다 커야한다.

Keywords

References

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