ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Waveguiding Effect in Electroabsorption Modulators: Passivation Layers and Their Impact on Extinction Ratios

  • Received : 2004.05.06
  • Published : 2005.02.28
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Abstract

Waveguide structures of the stand-alone electroabsorption (EA) modulator and the electroabsorption modulated laser (EML) are investigated using the 3D beam propagation method. The EA waveguide structures with InP-based passivation layers show saturation in the extinction ratio (ER) due to the stray light traveling through the passivation layers. This paper demonstrates that narrower passivation layers suppress stray-light excitation in the EA waveguide, increasing the ER. A taper structure in the isolation section of the EML waveguide can reduce the mode mismatch and suppress the excitation of the stray light, increasing the ER further. Low-index-polymer passivation layers can confine the mode more tightly in the active waveguide, yielding an even higher ER.

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References

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