The paper concludes that the "transient saturation" phenomenon can happen when optocouplers are used in serial communication port and binary output port.

In order to detect the presence of burst noise in optocoupler device accurately and objectively, a new method was put forward based on singularity of noise.

The paper introduces the time synchronization conception of the IRIG-B format code and its module constructions which include microprocessor, level converter and optically coupled isolator.