Method for audibly measuring optical efficiency in an installed fiber optic link

摘要: A method for introducing errors into a digital fiber optic communication link so that small analog changes in optical transmission efficiency can be determined by the audible error rate. The comprises providing transmitter with test channel provides pseudorandom encoded through coupled cables. signal is sent cables and received receiver which introduces measures errors. split processed clock recovery circuit lowpass filter. obtains optimal sampling point. filter filters data timing adjustment relative to recovered signal. retimes filtered comparator. variable allowing measurements. bit rate tester produces sounds whose frequency content related Optimal manipulating their associated ferrules until have lowest frequencies.