Theoretical investigation into spectral characteristics of a semiconductor laser with dual-FBG external cavity |
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| Authors: | Yize Huang Huiqun Zhu Guoxiang Tong Wei Zhang Ruoxi Sun Liu Li Qiuxin Zheng |
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| Institution: | a School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR Chinab Shanghai Key Laboratory of Modern Optical Systems, Shanghai 200093, PR Chinac Institute of Thin Films and Nanomaterials, Wuyi University, Jiangmen 529020, PR China |
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| Abstract: | A new theoretical model of the dual-FBG external cavity based on the couple-mode theory has been proposed for controlling the output spectral characteristics of the semiconductor laser with dual-FBG external cavity. The output spectral characteristics have been studied through the analyses of the external cavity length, the FBG length and the fiber length between the two FBGs. The results reveal that the side mode suppression ratio (SMSR), the full wave at half maximum (FWHM), the longitudinal mode interval (LMI) and the stability of the central wavelength are mainly determined by the effective external transmissivity, the fiber length between the two FBGs and the external cavity length, respectively. Furthermore, the rising/falling tendencies of the SMSR and the FWHM are exactly opposite. There exist the maximum of the SMSR and the minimum of the FWHM in a semiconductor laser with dual-FBG external cavity. The increase of the fiber length between the two FBGs results in the exponential decrease of the LMI. The increase of the external cavity length leads to the better stability of the central wavelength. |
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| Keywords: | Semiconductor laser Dual-FBG SMSR FWHM LMI |
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