Optical delay line made by Rayscience is offered in both manual or DC servo-motor, which can adjust all kind of optical distance as you request,

this max optical distance is more over 180mm. Delay line features lower insertion loss, precision adjustment based on micro level, high reliability.

Delay lines are offered using Singlemode fiber, PM fiber. Through RS232 series cable, it can easily to realize this PC-based long-distance controlling,

Which can assure to precisely control optical distance and time adjusting.