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Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency

IEEE photonics journal, 2019-08, Vol.11 (4), p.1-11 [Peer Reviewed Journal]

Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2019 ;ISSN: 1943-0655 ;EISSN: 1943-0655 ;DOI: 10.1109/JPHOT.2019.2921628 ;CODEN: PJHOC3

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  • Title:
    Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency
  • Author: Guo, Kuikui ; He, Jun ; Yang, Kaiming ; Zhang, Zhe ; Xu, Xizhen ; Du, Bin ; Xu, Gaixia ; Wang, Yiping
  • Subjects: apodized ; Cavity resonators ; distributed-feedback ; Doped fibers ; Efficiency ; Erbium ; Erbium-doped fiber lasers ; Feedback ; fiber ; fiber Bragg gratings ; Fiber gratings ; Fiber lasers ; Fiber optics ; fibers ; Frequency shift ; Lasers ; Optical communication ; Optical fiber communication ; Optical fiber sensors ; Optical fibers ; Pump lasers ; Symmetry ; Variations
  • Is Part Of: IEEE photonics journal, 2019-08, Vol.11 (4), p.1-11
  • Description: We propose and demonstrate a symmetric step-apodized distributed feedback (DFB) fiber laser, which has an improved efficiency and a narrow linewidth. This special DFB laser cavity is based on a unique symmetric step-apodized π-phase-shifted fiber Bragg grating (FBG) directly inscribed in a heavily erbium-doped fiber. The symmetric step-apodized phase-shifted grating is equivalent to a weak uniform phase-shifted FBG embedded in a pair of strong FBGs, and this design could increase the effective cavity length of a DFB fiber laser. Moreover, the symmetric step-apodized DFB laser cavity proposed in this work has a phase shift located in the cavity center. It could simplify the design process significantly due to the symmetry in the laser cavity. Experimental results show that the slope efficiency of a symmetric step-apodized DFB fiber laser could be increased to 1.06%, which is significantly higher than that of a uniform DFB fiber laser (i.e., 0.45%) under the same cavity length and pump conditions. In addition, the proposed DFB fiber laser exhibits a high stability. The fluctuations in lasing wavelength and output power were less than 12 pm (corresponding to a frequency shift of 1.49 GHz) and 0.13 dB within 24 h, respectively. Moreover, the full-width at half-maximum linewidth of the symmetric step-apodized DFB fiber laser was ∼2.6 kHz, measured by the delayed self-heterodyne method with a 50-km fiber delayed line. As such, the proposed symmetric step-apodized DFB fiber laser could potentially be used as high-performance light source for fiber-optic sensors or coherent optical communication systems.
  • Publisher: Piscataway: IEEE
  • Language: English
  • Identifier: ISSN: 1943-0655
    EISSN: 1943-0655
    DOI: 10.1109/JPHOT.2019.2921628
    CODEN: PJHOC3
  • Source: IEEE Open Access Journals
    DOAJ Directory of Open Access Journals
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