What will be measured is only the detector output, meaning the 15-nsec pulse. Again, I only care about the timestamp of the pulse.

I have attached a simple block diagram of my system that should clarify things.

I am a graduate student doing an experiment in quantum cryptology. I will describe the experimental setup and then say what it is I am looking for. I have a pulsed laser, operating at 10kHz (that's a 100usec period). Each pulse is 4.1 nsec wide and is later attenuated to achieve (theoretically) one ...