Title :
40 Gbit/s, 16-ary (4 bit/symbol) optical modulation/demodulation scheme
Author :
Sekine, K. ; Kikuchi, N. ; Sasaki, S. ; Hayase, S. ; Hasegawa, C. ; Sugawara, T.
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
fDate :
3/31/2005 12:00:00 AM
Abstract :
A practical 16-ary amplitude-phase-shift-keying (16APSK) optical modulation/demodulation scheme (4 bit/symbol) with a combination of multilevel amplitude and phase modulations is proposed, and its feasibility is successfully demonstrated for the first time. The spectral width of return-to-zero 16APSK signal is only 0.27 nm (33.75 GHz) at 20 dB down, even with 40 Gbit/s modulation.
Keywords :
amplitude shift keying; optical modulation; phase shift keying; 40 Gbit/s; amplitude-phase-shift-keying; multilevel amplitude modulation; optical modulation/demodulation; phase modulation; return-to-zero 16APSK;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20050383
