Thank you, action-or-reaction.

I followed the link "fiber optic coupler array" in your post. Scrolling down a few pages I read:

POET can be used to construct a variety of high performance transistor devices, such as complementary NHFET and PHFET unipolar devices as well as n-type and p-type HBT bipolar devices. POET can also be used to construct a variety of optoelectronic devices which include:

• • a thyristor VCSEL laser;
  • an NHFET laser;
  • an PHFET laser;
  • a thyristor optical detector;
  • an NHFET optical detector;
  • a PHFET optical detector;
  • a semiconductor optical amplifier (SOA) or a linear optical amplifier (LOA) based on either one (or both) of the n-type and p-type quantum well interfaces;
  • an absorption (intensity) optical modulators based on either one (or both) of the n-type and p-type quantum well interfaces;
  • a phase modulator based on either one (or both) of the n-type and p-type quantum well interfaces;
  • a waveguide switch; and
  • a passive waveguide.

Nice collection, IMO.

Wasn´t there a question at the board if the thyristor is the VCSEL (I am not a technician, sorry if its a dumb question)? Yes it is as written above.

Holk