Title :
All-Optical RZ-DPSK WDM to RZ-DQPSK Phase Multiplexing Using Four-Wave Mixing in Highly Nonlinear Fiber
Author :
Lu, Guo-Wei ; Abedin, Kazi Sarwar ; Miyazaki, Tetsuya
Author_Institution :
Nat. Inst. of Inf. & Commun. Technol., Tokyo
Abstract :
We propose and experimentally demonstrate an all-optical phase multiplexing scheme using four-wave mixing in a highly nonlinear fiber. Two 10-Gb/s pi/2-shifted return-to-zero (RZ) differential phase-shift-keying (DPSK) wavelength-division-multiplexing (WDM) signals are successfully phase-multiplexed into a 20-Gb/s RZ differential quadrature phase-shift-keying signal with a negative 1.6-dB power penalty. With more input DPSK WDM signals, the proposed scheme can be applied to obtain a multilevel phase-shift-keying signal with increased capacity and enhanced spectral efficiency.
Keywords :
differential phase shift keying; multiwave mixing; optical fibre communication; optical modulation; phase modulation; quadrature phase shift keying; wavelength division multiplexing; all-optical RZ-DPSK WDM; all-optical phase multiplexing; bit rate 10 Gbit/s; bit rate 20 Gbit/s; four-wave mixing; power penalty; return-to-zero differential quadrature phase-shift-keying; spectral efficiency; wavelength-division-multiplexing; Differential quadrature phase shift keying; Four-wave mixing; Optical fibers; Optical signal processing; Optical wavelength conversion; Phase modulation; Phase shift keying; Signal generators; WDM networks; Wavelength division multiplexing; Differential phase-shift keying (DPSK); differential quadrature phase-shift keying (DQPSK); four-wave mixing (FWM); optical fiber communications; phase modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.905199
