The Clock Recovery component works by comparing a reference signal to the output signal (both electrical). It will automatically adjust the output signal by shifting it. It also stores the time delay value in the result section (Check the Project Browser or right-click the component and navigate to Component Results).
If you are using OptiSystem 13 you should be able to open the attached project file, where I implemented the time delay component.
I would not worry about the DMD component if you are not working with multimodes.
Regards