Hi all

https://osioptoelectronics.com/technology-corner/frequently-asked-questions/position-sensing-devices.aspx

Hamamatsu produces PSDs. Many photo detectors at CERN are made by Hanamatsu as well as Lead Glass and other photonic stuff.

https://www.hamamatsu.com/us/en/index.html

There should be something usable.

Also a laser can be modulated with different high frequencies and by comparing the phase between these modulated frequencies one can get the time of flight, hence the position.
It should be possible to modulate a fiber transmitter for 100km monomode 1310nm fiber with a pulsecode signal and to decode the signal using the receiver of the fiber trx.
So fiber trx used are quite cheap. Fiber patch cord also.
So it is just a matter of how to control the fiber trx at low level and how to feet a "datastream" to it that will reveal time delays if one xors txdata and rxdata using fast ecl logic and some serdes approach.

Cheers

Luja

On January 26, 2022 7:32:09 AM GMT+01:00, "David Lanzendörfer" <leviathan@libresilicon.com> wrote:

Hi
What about just buying a new cheap Chinese laser diode and a photo diode and
then putting a mirror onto the lense carrier, which reflects the laser diode 
beam back to the photo diode next to the laser diode?

Cheers
-lev
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