Title :
All-Optical RZ-to-NRZ Conversion of Advanced Modulated Signals
Author :
Groumas, Panos ; Katopodis, Vasilis ; Kouloumentas, Christos ; Bougioukos, Marios ; Avramopoulos, Hercules
Author_Institution :
Photonic Commun. Res. Lab., Nat. Tech. Univ. of Athens, Athens, Greece
Abstract :
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.
Keywords :
band-pass filters; differential phase shift keying; light interferometers; optical filters; optical frequency conversion; optical modulation; advanced modulated optical signals; all-optical RZ-to-NRZ conversion; bit rate 40 Gbit/s; delay interferometer; differential phase shift keying; frequency periodicity; nonreturn-to-zero format conversion; optical band-pass filter; power penalty; return-to-zero format conversion; symbol rate; Differential phase shift keying; Fluctuations; Optical filters; Optical interferometry; Optical modulation; Optical signal processing; Format conversion; higher order modulation formats; integrated optics; phase modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2174783
