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Experimental demonstration of eight-wavelength distributed feedback semiconductor laser array using equivalent phase

Yuechun Shi1, Xiangfei Chen, Yating Zhou

  • 1Microwave-Photonics Technology Laboratory, Nanjing National Laboratory of Microstructures and School of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.

Optics Letters
|February 6, 2013
PubMed
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A novel eight-wavelength distributed feedback semiconductor laser array was developed using a low-cost fabrication method. This laser array exhibits excellent wavelength linearity and high performance, making it suitable for various applications.

Area of Science:

  • Photonics and Optoelectronics
  • Semiconductor Device Physics

Background:

  • Distributed feedback (DFB) semiconductor lasers are crucial for optical communication and sensing.
  • Achieving multi-wavelength emission with high linearity and performance is a key challenge.

Purpose of the Study:

  • To demonstrate an eight-wavelength DFB semiconductor laser array.
  • To achieve precise wavelength control and high performance using the reconstruction-equivalent-chirp (REC) technique.
  • To develop a cost-effective fabrication process.

Main Methods:

  • Fabrication of an eight-wavelength DFB semiconductor laser array using the REC technique with a λ/4 equivalent phase shift.
  • Utilizing common holographic exposure and micrometer-level conventional photolithography for grating fabrication.

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  • Characterization of lasing wavelengths, threshold currents, side-mode suppression ratios, and slope efficiencies.

    • Main Results:

    • Demonstrated an eight-wavelength DFB semiconductor laser array with excellent wavelength linearity (deviation from -0.22 to 0.20 nm).
    • Achieved threshold currents between 19 and 24 mA.
    • Obtained side-mode suppression ratios greater than 40 dB at 70 mA bias current.
    • Reported slope efficiencies of approximately 0.4 W/A at room temperature.
    • Employed a low-cost fabrication process involving holographic exposure and photolithography.

    Conclusions:

    • The developed eight-wavelength DFB semiconductor laser array offers high performance and precise wavelength control.
    • The cost-effective fabrication method makes this technology accessible for broader applications.
    • The results highlight the potential of the REC technique for advanced laser array development.