PROJECT TITLE :
Single-Frequency and Single-Polarization DFB Fiber Laser Based on Tapered FBG and Self-Injection Locking
A stable single-polarization slender linewidth single-frequency distributed feedback (DFB) fiber laser is proposed and demonstrated. For the primary time, to our information, the tapered FBG written in the photosensitive massive-mode-space (LMA) high-concentration erbium-doped fiber (EDF) is applied in the DFB fiber laser. Self-injection locking is used to form the proposed DFB fiber laser operate in the stable single-polarization state and reduce the linewidth of the DFB fiber laser. The LMA high-concentration EDF is fabricated by the changed chemical vapor deposition technique. The tapered FBG will be seen because the equivalent part shift FBG, and also the equivalent section shift is produced by tapering the uniform FBG directly. The threshold of the DFB fiber laser is regarding a hundred forty five mW, and the most output power is forty three.55 mW at 450-mW pump power. The measured and changed slope efficiencies of the DFB fiber laser are approximately fourteen.27% and fifteen.82%, and therefore the optical signal-to-noise ratio (OSNR) of the laser is over 55 dB. The stable single-polarization and single-frequency operation of the fiber laser is realized, and therefore the measured twenty-dB linewidth of DFB fiber laser with self-injection locking and without self-injection locking are approximately ten.three and fifty two.3 kHz, respectively.
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