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Proceedings Paper

Theoretical analysis of emission characteristics of second-order distributed feedback semiconductor lasers
Author(s): Li Qin; Shujuan Ye; Yongsheng Hu; Nan Zhang; Yongqiang Ning; Yun Liu; Lijun Wang
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Paper Abstract

Based on the modified coupled-wave theory, the emission characteristics, including threshold gain, photon density distribution in the cavity, and external differential quantum efficiency for second-order DFB lasers are investigated. Numerical simulation results show that for given device structure with wavelength of 1.55 μm, the feedback coupling coefficient and the surface radiation coupling coefficient of the second-order grating have great influence on the emission characteristics of the device. By choosing different duty cycles of the grating, we can change the two coupling coefficients, which affect the emission characteristics. For an overall consideration, an optimal duty cycle of 0.43 is chosen. The optimized results show that the device works without degeneracy modes and spatial burning hole. Besides, the side-mode suppress ratio (SMSR) and external differential quantum efficiency reach as high as 42 dB and 47%, respectively.

Paper Details

Date Published: 12 November 2010
PDF: 9 pages
Proc. SPIE 7844, Semiconductor Lasers and Applications IV, 78440L (12 November 2010); doi: 10.1117/12.869078
Show Author Affiliations
Li Qin, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Shujuan Ye, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Yongsheng Hu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Nan Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Yongqiang Ning, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Yun Liu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Lijun Wang, Changchun Institute of Optics, Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 7844:
Semiconductor Lasers and Applications IV
Ning-Hua Zhu; Jinmin Li; Farzin Amzajerdian; Hiroyuki Suzuki, Editor(s)

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