ABSTRACT
The actual performance of an installed link is frequently different from the designed performance. Initially, there is a larger link margin than there will be at the end of life. It is important that both components and the installed link undergo testing to verify functional operation. Additional testing may be performed over the life of the system to ensure continued functional operation. Component testing is performed prior to installation of the components into a link. Acceptance testing of functional module sets begins with power testing of the transmitter. Fiber acceptance testing also begins with power testing. Link testing is an integral part of the installation process. Link performance testing is done to verify the transmission quality. Optical component testing uses calibrated power sources and optical power meters. Optical link testing is performed using an optical time domain reflectometer. The most commonly used piece of test equipment is the optical power meter.
