I am reading an analog design document that talks about the term QBD but does not elaborate what this is.
The design pertains to photonics function.

Can anyone take a guess what QBD could stand for?

 

https://en.wikipedia.org/wiki/QBD_(electronics)

 

https://www.allaboutcircuits.com/textbook/semiconductors/chpt-2/quantum-devices/

 

Thanks a lot. I did a bit of searching and it appears QBD stands for quadrature bias diode

 

QBD could stand for quantum barrier diode.

QBD stands for charge-to-breakdown.