PROBLEM TO BE SOLVED: To provide an 'all optical' converter for converting an NRZ format input signal into an RZ format output signal.;SOLUTION: This is a converter of an NRZ signal with a bit duration T, which comprises an interferometer structure 10 having two pieces of arms 9, 11 provided with media 13, 15 of which the refractive indices vary according to optical power passing therethrough. The NRZ signal to be converted are inputted to the arms 9, 11, respectively. An output signal 7 of the interferometer structure is re-inputted to a piece of arm 11 via a means for delaying by T/2. Then, the signal of the output part 7 is an NRZ signal converted according to RZ format.;COPYRIGHT: (C)2002,JPO
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