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All-Optical RZ-to-NRZ Conversion of Advanced Modulated Signals

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5 Author(s)
Groumas, P. ; Photonic Commun. Res. Lab., Nat. Tech. Univ. of Athens, Athens, Greece ; Katopodis, V. ; Kouloumentas, C. ; Bougioukos, M.
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A generic scheme for return-to-zero (RZ) to nonreturn-to-zero (NRZ) format conversion of optical signals is analyzed. It relies on a simple delay interferometer with frequency periodicity twice as high as the input symbol rate and a subsequent optical band-pass filter. Simulation results at 40 Gbaud indicate the compatibility of the technique with a variety of advanced modulation formats. RZ-to-NRZ conversion of 40 Gb/s differential phase shift keying signals is experimentally demonstrated with 1.5 dB power penalty compared to the back-to-back measurement.

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 3 )