This paper describes measurement equipment developed for evaluating transmission characteristics of long optical transmission line. The equipment for the transmission bandwidth measurement is stabilized by coupling an oblique-cut fiber to a laser diode and by superimposing a low frequency signal onto the baseband signal. Optical loss in 5 km a transmission line can be measured using the optical time domain reflectometer with a gated photomultiplier and digital averaging. An optical fiber identifier, utilizing radiation power due to fiber bends, is also described.
|Number of pages||13|
|Journal||Reports of the Electrical Communication Laboratory|
|Publication status||Published - 1981 Jan 1|
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