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Optical amplification in Er/Yb silicate slot waveguide.

Ruimin Guo1, Bing Wang, Xingjun Wang

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing, China.

Optics Letters
|May 5, 2012
PubMed
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Active slot waveguides with erbium/ytterbium silicate achieved 1.7 dB signal enhancement. Defects in silicon limit amplification, but annealing improves performance by enhancing pump light propagation and excitation.

Area of Science:

  • Photonics and optical engineering.
  • Materials science for optoelectronics.

Background:

  • Integrated photonics requires efficient optical amplifiers.
  • Erbium-doped materials are crucial for 1.53 µm optical amplification.
  • Slot waveguide structures offer enhanced light-matter interaction.

Purpose of the Study:

  • To fabricate and characterize active slot waveguides for optical amplification.
  • To investigate the impact of defects on waveguide performance.
  • To explore methods for improving optical gain.

Main Methods:

  • Fabrication of slot waveguides by embedding Er/Yb silicate in silicon.
  • Optical pumping at 1476 nm to achieve signal enhancement at 1.53 µm.
  • Analysis of photoluminescence spectra and decay curves to identify defect-related issues.

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Main Results:

  • Observed 1.7 dB signal enhancement in a 6 mm-long slot waveguide.
  • Determined peak Er emission cross-section (7.53×10⁻²¹ cm²) and excited Er ion fraction (0.17).
  • Identified silicon defects as a limiting factor for optical amplification and lifetime.

Conclusions:

  • Annealing treatment partially corrects defect-induced distortions, improving pump light propagation and excitation.
  • Defects significantly reduce ion lifetime and hinder further optical amplification in the active slot waveguides.
  • Optimizing material quality and fabrication processes is essential for realizing high-performance silicon-based optical amplifiers.