A technician is using an Optical Time Domain Reflectometer (OTDR) to troubleshoot a newly-installed single-mode fiber link that is not performing up to expected specifications. The OTDR report shows a significant spike followed by a drop in signal level at a certain distance from the start. What is the MOST likely cause of this specific pattern in the OTDR trace?
There is a poor splice at the indicated distance.
The fiber has been cleanly cut at the indicated distance.
There is a macrobend near the OTDR's starting point.
The fiber connector at the start point is dirty.