A detailed description of the experimental setup and
measurement results can be found in the article below:

Measurement of optical to electrical and electrical
to optical delays with ps-level uncertainty
published in Opt. Express 26, 14650-14660 (2018)
and is available under the Creative Commons
Attribution-ShareAlike 4.0 International License .

This method can be used to bootstrap the absolute
delay calibration of SFP receivers and transmitters.
https://www.ohwr.org/project/wr-calibration/wikis/Electrical-Optical-Optical-Electrical-(EO-OE)-Calibration On behalf of all authors,

Henk Peek