한쪽 거울면의 격자 위상이 π/2인 DFB 레이저의 시뮬레이션과 검정
Simulation and Examination for DFB Lasers with Grating Phase of π/2 on One Mirror Face
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초록
광대역 광통신 시스템에 사용되는 레이저는 우수한 주파수 선택성과 모드 안정성을 가져야한다. DFB(Distributed Feedback) 레이저는 고주파로 전류 변조를 하더라도 발진 주파수의 변화가 적다. 본 연구에서는 무반사 코팅을 하지 않은, 두 거울 면을 가진 1.55um의 파장을 갖는 DFB 레이저에서 이득격자와 굴절률 격자가 동시에 존재할 때, 시뮬레이션 소프트웨어를 개발하여 종 방향으로의 발진 모드의 발진 이득과 발진 주파수를 해석하였다. 왼쪽 거울 면에서의 격자 위상은 π/2로 고정하고, 오른쪽 거울 면에서의 격자 위상 값은 변화시켰다. 오른쪽 거울 면에서의 격자 위상 값이 π와 0일 때, 이 2∼6의 범위에 있어야 주파수 안정도가 향상된다. 거울 면에서의 격자 위상에 관계없이 발진 모드의 문턱 전류를 낮추기 위해서는, 이 8보다 커야한다..
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.
참고문헌 (11)
- T.L. Koch, "Semiconductor lasers for coherent optical fiber communications", Journal of Lightwave Technology, 8(3), pp.274~293 (1990), Institute of Electrical and Electronics Engineers (IEEE)[DOI]
- H. Olesen, "Single-mode stability of DFB lasers with longitudinal Bragg detuning", IEEE Photonics Technology Letters, 7(5), pp.461~463 (1995), Institute of Electrical and Electronics Engineers (IEEE)[DOI]
- S.K.B. Lo, "A method to determine the above-threshold stability of distributed feedback semiconductor laser diodes", Journal of Lightwave Technology, 13(4), pp.563~568 (1995), Institute of Electrical and Electronics Engineers (IEEE)[DOI]
- 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, 1, pp.3~6 (2004)
- Jing-Yi Wang, "Theory for optimum design and analysis of distributed-feedback lasers", IEEE Photonics Technology Letters, 11(1), pp.24~26 (1999), Institute of Electrical and Electronics Engineers (IEEE)[DOI]
- M. Okai, "Stability of the longitudinal mode in lambda", 4-shifted InGaAsP, IEEE Journal of Quantum Electronics, pp.1989, 25(6)[DOI]
- T. Yamanaka, "Numerical analysis of static wavelength shift for DFB lasers with longitudinal mode spatial hole burning", IEEE Photonics Technology Letters, 3(7), pp.610~612 (1991), Institute of Electrical and Electronics Engineers (IEEE)[DOI]
- G. Morthier, "Design of index-coupled DEB lasers with reduced longitudinal spatial hole burning", Journal of Lightwave Technology, 9(10), pp.1305~1313 (1991), Institute of Electrical and Electronics Engineers (IEEE)[DOI]
- T.K. Sudoh, "Self-suppression effect of longitudinal spatial hole burning in absorptive-grating gain-coupled DFB lasers", IEEE Photonics Technology Letters, 5(11), pp.1276~1278 (1993), Institute of Electrical and Electronics Engineers (IEEE)[DOI]
- X. Pan, "Spectral linewidth of DFB lasers including the effects of spatial holeburning and nonuniform current injection", IEEE Photonics Technology Letters, 2(5), pp.312~315 (1990), Institute of Electrical and Electronics Engineers (IEEE)[DOI]
- 권기영, "DFB 레이저의 빔 분포 시뮬레이션과 검정", 한국소프트웨어감정평가학회 논문지, 15(1), pp.71~78 (2019), 한국소프트웨어감정평가학회[DOI]