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Reconfigurable multi-channel WDM drop module using a tunable wavelength-selective photodetector array.

Xiaofeng Duan1, Yongqing Huang, Xiaomin Ren

  • 1Institute of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications(BUPT), Key Laboratory of Information Photonics and Optical Communications (BUPT), Ministry of Education Beijing 100876, China. xiaofengduan@163.com

Optics Express
|April 15, 2010
PubMed
Summary
This summary is machine-generated.

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A novel tunable wavelength-selective photodetector array enables a reconfigurable four-channel wavelength-division-multiplexing (WDM) drop module. This integrated device operates in the long-wavelength spectrum for advanced optical communication systems.

Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Wavelength-division-multiplexing (WDM) is crucial for increasing optical network capacity.
  • Reconfigurable optical add-drop multiplexers (ROADMs) are essential components for flexible network management.
  • Existing technologies face challenges in achieving high performance and tunability in compact modules.

Purpose of the Study:

  • To demonstrate an integrated, reconfigurable four-channel WDM drop module.
  • To utilize a tunable wavelength-selective photodetector array for selective signal dropping.
  • To achieve efficient and tunable optical signal filtering in the long-wavelength band.

Main Methods:

  • Fabrication of an InP-based p-i-n photodetector array integrated with a GaAs-based multistep Fabry-Pérot filtering cavity.

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  • Utilizing high-quality GaAs/InP heteroepitaxy with a low-temperature buffer layer.
  • Employing wet etching and regrowth techniques for the multistep cavity fabrication.

    • Main Results:

    • Demonstrated a four-channel WDM drop module with central wavelengths at 1538, 1550, 1559, and 1570nm.
    • Achieved a tunable range of 10nm with a tuning power efficiency of 14.2nm/W.
    • Obtained a spectral linewidth < 0.5nm (FWHM), 3dB bandwidth of 9.2GHz, and peak quantum efficiencies of 13-20%.

    Conclusions:

    • The developed tunable photodetector array successfully enables a reconfigurable WDM drop module.
    • The integrated device offers high performance metrics suitable for long-wavelength optical communication.
    • The fabrication approach ensures high-quality heteroepitaxy and efficient device operation.