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Related Concept Videos

MOS Capacitor01:25

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Related Experiment Video

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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Suppressing the turn-off-induced pulsations in VCSELs using an elevated oxide-layer structure.

Taeyong Kim1, Sang-Bae Kim

  • 1Department of Electrical and Computer Engineering, Ajou University, Gyeonggi, South Korea. otherwisekay@gmail.com

Optics Express
|February 23, 2010
PubMed
Summary

Elevated oxide-layer vertical-cavity surface-emitting lasers (VCSELs) significantly suppress turn-off pulsations. This advancement allows VCSEL transmitters to operate reliably without performance degradation from transient effects.

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Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Area of Science:

  • Optoelectronics
  • Semiconductor Devices
  • Laser Physics

Background:

  • Vertical-cavity surface-emitting lasers (VCSELs) are crucial for high-speed optical communication.
  • Turn-off-induced transient responses, including pulsations, can degrade VCSEL performance.
  • Optimizing VCSEL structures is essential for reliable high-bit-rate operation.

Purpose of the Study:

  • To investigate the effectiveness of an elevated oxide-layer structure in suppressing turn-off-induced abnormalities in VCSELs.
  • To compare the transient responses of conventional and elevated oxide-layer VCSELs.
  • To analyze the impact of current and bit rate on the suppression of turn-off effects.

Main Methods:

  • Fabrication and characterization of elevated oxide-layer VCSELs with a specific cavity-oxide spacing (9λ/4).
  • Comparison of turn-off transient responses between conventional and elevated oxide-layer VCSELs (approx. 6.6 μm aperture diameter).
  • Analysis of "on"-"off" current dependence and bit rate dependence of timing jitters.

Main Results:

  • The elevated oxide-layer structure effectively suppresses secondary pulsations, bumps, and tails during turn-off.
  • Turn-off-induced pulsations were reduced to less than half compared to conventional VCSELs.
  • Timing jitters showed improved stability at higher bit rates with the elevated structure.

Conclusions:

  • The elevated oxide-layer design is a viable strategy for mitigating turn-off-induced issues in VCSELs.
  • This structural modification enhances the operational stability and reliability of VCSEL transmitters.
  • Further research can explore variations in oxide layer spacing for optimized performance.