Why does the OTDR pigtail fiber have a range of 1km
This ensures the entire link, including the end-of-fiber event, is clearly visible. If the pigtail is sufficiently long, 10 meters or so, VIAVI SolutionsTM Optical Time Domain Reflectometers (OTDRs) with pulses as short as 1 foot can perform these measurements. Depending upon their particular specifications and the actual distances involved, some instruments may or may not use. The actual resolution of the OTDR is usually thought of as its ability to distinguish between two points on the cable, like intermediate. 3 EDGE GmbH offers special "pre-fiber/post-fiber for OTDR measurements according to IEC standard for bridging the event dead zones and for protecting the device connectors".
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