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22-Gb/s Long Wavelength VCSELs.

Werner Hofmann1, Michael Müller, Alexey Nadtochiy

  • 1Department of Electrical Engineering and Computer Science, University of California at Berkeley, Cory Hall, Berkeley, CA 94720, USA. whofmann@eecs.berkeley.edu

Optics Express
|November 13, 2009
PubMed
Summary
This summary is machine-generated.

High-speed vertical cavity surface-emitting lasers (VCSELs) achieve 22 Gb/s modulation. Uncooled, error-free operation up to 85°C at 12.5 Gb/s demonstrates stable performance for advanced optical communication.

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Area of Science:

  • Optoelectronics and Photonics
  • Semiconductor Devices
  • Optical Communications

Background:

  • Vertical Cavity Surface-Emitting Lasers (VCSELs) are crucial for optical communications.
  • Advancements in VCSEL technology are needed for higher data rates and improved temperature stability.
  • Parasitic effects can limit the performance of high-speed VCSELs.

Purpose of the Study:

  • To demonstrate high-speed modulation capabilities of 1.55-microm VCSELs.
  • To evaluate the uncooled, error-free operating performance of these VCSELs over a wide temperature range.
  • To investigate the impact of constant bias conditions on VCSEL characteristics with temperature variations.

Main Methods:

  • Fabrication of 1.55-microm vertical cavity surface-emitting lasers with reduced parasitic effects.
  • High-speed eye-diagram measurements to determine modulation speed.
  • Error-free data transmission testing under varying temperature conditions (up to 85°C) with constant bias.
  • Analysis of laser characteristics (e.g., output power, wavelength) as a function of temperature.

Main Results:

  • Achieved open eye diagrams up to 22 Gb/s modulation speed.
  • Demonstrated uncooled, error-free operation at 12.5 Gb/s data rate up to 85°C.
  • Observed that laser characteristics remained practically invariant with temperature under constant bias conditions.
  • Reported the highest data rates to date for a long-wavelength VCSEL structure.

Conclusions:

  • The developed 1.55-microm VCSELs exhibit excellent high-speed performance.
  • Constant bias operation provides remarkable temperature stability, crucial for uncooled applications.
  • These results represent a significant advancement in long-wavelength VCSEL technology for optical networks.