Over the years, I have found chemical visibility to be a real advantage. In a glass bubbler, you can confirm proper chemical level, confirm a uniform bubble stream, and view the chemical color. (A color change may indicate delivery system corrosion.) Glass bubblers offer these additional benefits:

  • The bubble stream can be observed and frit plugging can be detected, rather than assuming all is well.
  • POCl3 is not compatible with stainless steel for long durations. If you use this liquid and have a stainless steel gas delivery system, you may want to install a glass bubbler to create a hybrid system.
  • O rare occasions, you may want to increase the chemical temperature in the bubblers above 40 degrees C. This practice can pull metal ions from stainless steel and into your bubble stream. Clearly, this can degrade the fiber’s optical properties and should be considered when choosing an MCVD system.


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