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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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DFB laser based on single mode large effective area heavy concentration EDF.

Qi Li1, Fengping Yan, Wanjing Peng

  • 1Key Lab of All Optical Network and Advanced Telecommunication, Institute of Lightwave Technology, Beijing Jiaotong University, 100044 Beijing, China.

Optics Express
|November 29, 2012
PubMed
Summary

This study demonstrates a novel π phase shifted distributed feedback (DFB) laser using a heavy concentration erbium-doped fiber (EDF). The developed DFB laser exhibits excellent signal-to-noise ratio and narrow linewidth, crucial for advanced optical applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Fiber Optics

Background:

  • Distributed feedback (DFB) lasers are essential components in optical communication systems.
  • Erbium-doped fibers (EDFs) offer unique gain properties for fiber laser development.
  • Achieving high performance in EDF-based DFB lasers requires careful control of fiber parameters and grating fabrication.

Purpose of the Study:

  • To demonstrate a π phase shifted DFB laser utilizing a single-mode, large effective area, heavy concentration EDF.
  • To characterize the performance of the fabricated EDF and the resulting DFB laser.

Main Methods:

  • Fabrication of a homemade EDF using the modified chemical-vapor deposition (MCVD) technique.
  • Writing a 13cm long π phase shifted fiber grating within the EDF core.
  • Characterization of EDF properties including erbium concentration, mode field diameter, and absorption coefficients.
  • Measurement of DFB laser threshold, output power, slope efficiency, signal-to-noise ratio (SNR), and linewidth.

Main Results:

  • The EDF exhibited an erbium-doped concentration of 4.19 × 10^25 ions/m^3, a mode field diameter of 12.2801 μm at 1550 nm, and absorption coefficients of 34.534 dB/m at 980 nm and 84.253 dB/m at 1530 nm.
  • The DFB laser achieved a threshold power of 66 mW and a maximum output power of 43.5 mW at 450 mW pump power, with a slope efficiency of 11.5%.
  • The laser demonstrated a signal-to-noise ratio (SNR) of 55 dB and a Lorentz linewidth of 9.8 kHz at 200 mW input pump power.

Conclusions:

  • A π phase shifted DFB laser based on a heavy concentration EDF was successfully demonstrated.
  • The developed laser exhibits promising performance metrics, including high SNR and narrow linewidth.
  • This work contributes to the advancement of fiber laser technology for potential use in various optical applications.