Title :
An all-optical XOR logic gate for high-speed RZ-DPSK signals by FWM in semiconductor optical amplifier
Author :
Deng, Ning ; Chan, Kit ; Chan, Chun-Kit ; Chen, Lian-Kuan
Author_Institution :
Dept. of Inf. Eng., Chinese Univ. of Hong Kong
Abstract :
All-optical exclusive-OR (XOR) logic gate is a basic and crucial element for optical signal processing. We propose and demonstrate a novel high-speed all-optical XOR gate based on four-wave mixing (FWM) in a semiconductor optical amplifier, with optical return-to-zero differential phase-shift keying (RZ-DPSK) input signals. With this constant-envelope modulation format, the patterning effect-induced signal degradation in semiconductor optical amplifier (SOA) is alleviated. The proposed XOR gate can accommodate both two-input and three-input logic operations, which offer better flexibility for cascaded all-optical processing. Experimental demonstrations at 10- and 20-Gb/s verified the logic integrity of the proposed XOR gate. In addition, the XOR output tolerance against temporal misalignment among the data inputs is also experimentally investigated
Keywords :
differential phase shift keying; logic gates; multiwave mixing; optical fibre communication; optical logic; optical modulation; semiconductor optical amplifiers; 10 Gbit/s; 20 Gbit/s; FWM; RZ-DPSK signal; all-optical XOR logic gate; optical return-to-zero differential phase-shift keying; optical signal processing; patterning effect; semiconductor optical amplifier; Differential phase shift keying; Four-wave mixing; High speed optical techniques; Logic gates; Nonlinear optics; Optical mixing; Optical modulation; Optical signal processing; Semiconductor optical amplifiers; Stimulated emission; All-optical logic gate; differential phase-shift keying (DPSK); exclusive OR (XOR); four-wave mixing (FWM); optical signal processing; semiconductor optical amplifier (SOA);
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2006.876603
