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

The International Promotion Agency of Culture Technology (국제문화기술진흥원)
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Beam Profile Analysis of DFB Laser for High Speed Communications

고속 통신용 DFB 레이저의 빔 분포 해석

  • Kwon, Keeyoung (Division of Electrical, Electronic and Control Engineering, Kongju National University)
  • 권기영 (공주대학교 전기전자제어공학부)
  • Received : 2020.05.15
  • Accepted : 2020.07.01
  • Published : 2020.08.31
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Abstract

In this paper, when a refractive index grating and a gain grating are simultaneously present in a DFB (Distributed Feedback) laser for a 1.55 um wavelength with two mirror surfaces without an anti-reflective coating, an analysis program was developed to determine the beam distribution of the oscillation mode in the longitudinal direction. As the phases of the index and gain gratings on the mirror faces are varied, the lasing gain and the beam profiles |R(z)| and |S(z)| of the lasing mode with the emitted power ratio Pl/Pr are analyzed and examined in case of δL<0. In order to reduce the threshold current of a oscillation mode and enhance the frequency stability, κL should be greater than 8, regardless of the grating phase values at the mirror surface.

본 연구에서는 무반사 코팅을 하지 않은, 두 개의 거울 면을 갖는 1.55um 파장용 DFB(Distributed Feedback) 레이저에서 굴절률 격자와 이득 격자가 동시에 존재할 때, 해석 프로그램을 개발하여 종 방향으로 발진 모드의 빔 분포를 해석하였다. 굴절률 격자와 이득 격자가 거울 면에서 갖는 위상 값의 변화에 따라서, δL<0인 경우에 대하여, DFB 레이저의 발진 모드에 대한 발진 이득, 빔 분포 |R(z)|와 |S(z)|, 그리고 방사전력비 Pl/Pr를 비교 분석하였다. 거울 면에서의 격자 위상 값에 관계없이 발진 모드의 문턱 전류를 낮추고 주파수 안정성을 높이기 위해서는, κL이 8보다 커야한다.

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References

  1. Heejin Kim, Yunseon Park, Seulgi Ryu, Gaeun Lee, Seungjoo Lee, Jongkwon Won, Hyejeong Hwang, Younghyun Chang, "Korea's development strategy through 5G network global status analysis", The Journal of the Convergence on Culture Technology, vol. 3, no. 21, pp.43-48, 2017. http://dx.doi.org/10.17703/JCCT.2017.3.2.43
  2. Seokyoung Kim, Kwangki Ryoo, "Research on information & communication work business in response to the fourth industrial revolution", The Journal of the Convergence on Culture Technology, vol. 5, no. 1, pp.139-146, 2019. http://dx.doi.org/10.17703/JCCT.2019.5.1.139
  3. T.L. Koch, U. Koren, "Semiconductor lasers for coherent optical fiber communications", Journal of Lightwave Technology, vol. 8, no. 3, pp. 274-293, 1990. DOI: 10.1109/50.50725
  4. Jing-Yi Wang, M. Cada, Jin Sun, "Theory for optimum design and analysis of distributed-feedback lasers", IEEE Photonics Technology Letters, vol. 11, issue 1, pp. 24-26, 1999. DOI: 10.1109/68.736378
  5. S.K.B. Lo, H. Ghafouri-Shiraz, "A method to determine the above-threshold stability of distributed feedback semiconductor laser diodes", Lightwave Technology Journal of, vol. 13, no. 4, pp. 563-568, 1995. DOI: 10.1109/50.372466
  6. H. Olesen, J. Salzman, B. Jonsson, B. Tromborg, "Single-mode stability of DFB lasers with longitudinal Bragg detuning", IEEE Photonics Technology Letters, vol. 7, issue 5, pp. 461-463, 1995. DOI: 10.1109/68.384510
  7. C.A. Ferreira Fernandes, "Stability in single longitudinal mode operation in DFB laser structures", Electrotechnical Conference 2004. MELECON 2004. Proceedings of the 12th IEEE Mediterranean, vol. 1, pp. 3-6 Vol.1, 2004. DOI: 10.1109/MELCON.2004.1346756
  8. M. Okai, S. Tsuji, N. Chinone, "Stability of the longitudinal mode in lambda/4-shifted InGaAsP/InP DFB lasers, IEEE Journal of Quantum Electronics, vol. 25, issue 6, pp. 1314-1319, 1989. DOI: 10.1109/3.29262
  9. X. Pan, H. Olesen, B. Tromborg, "Spectral linewidth of DFB lasers including the effects of spatial hole-burning and nonuniform current injection", Photonics Technology Letters IEEE, vol. 2, no. 5, pp. 312-315, 1990. DOI: 10.1109/68.54690
  10. G. Morthier, R. Baets, "Design of index-coupled DEB lasers with reduced longitudinal spatial hole burning", Lightwave Technology Journal of, vol. 9, no. 10, pp. 1305-1313, 1991. DOI: 10.1109/50.90928
  11. T. Yamanaka, S. Seki, K. Yokoyama, "Numerical analysis of static wavelength shift for DFB lasers with longitudinal mode spatial hole burning", IEEE Photonics Technology Letters, vol. 3, issue 7, pp. 610-612, 1991, DOI: 10.1109/68.87929
  12. T.K. Sudoh, Y. Nakano, K. Tada, K. Kikuchi, T. Hirata, H. Hosomatsu, "Self-suppression effect of longitudinal spatial hole burning in absorptive-grating gain-coupled DFB lasers", Photonics Technology Letters IEEE, vol. 5, no. 11, pp. 1276-1278, 1993. DOI: 10.1109/68.250043