A parallel the optical transmission module (14) with a generating circuit for optical data (22, 23), the respective optical data signals in accordance with a parallel data channels (ch0 – ch3) is generated, characterized in thatthe parallel optical transmission module further comprises:a pattern generating circuit (27, 28, 29), which generates an optical specimen signal; andan optical mixer (30, 31), which is connected with the generating circuit for optical data and of the pattern generating circuit is connected, and the optical specimen signal by means of each of the parallel data channels, regardless of whether the optical mixer the optical data signals from the generating circuit for optical data or not, wherein the optical mixer the optical specimen signal to the optical data signals multiplexes, if the optical mixer the optical data signals from the generating circuit for optical data.
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