Converter of an NRZ signal with a bit duration T comprising an interferometric structure (10) with two arms (9, 11) equipped with a medium (13, 15) with an index that varies depending on the optical power passing through the said medium. The NRZ signal to be converted is input into each of the arms (9, 11). The output signal (7) from the structure is reinput through a means (16) introducing a delay of T/2 in one of the arms (11).;The signal at the output (7) is then the NRZ signal converted to the RZ format.
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