The paper approaches the process of testing for analogue quality transmission over plastic optical fiber (POF) system. For this purpose, we have designed a transmitting/ receiving interface built around TO082 (a wide bandwidth dual JFET input operational amplifier, with low input current and voltage noise), with programmable amplification controlled by microcontroller. A signal generator injects standard audio signal and the microcontroller evaluates the attenuation caused by the POF in the case of new, and five-year use of optical fiber. The measurements prove the "aging" of the fibers, with deterioration of the attenuation parameter.
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