Title :
All-Optical Logic Gate for XOR Operation Between 40-Gbaud QPSK Tributaries in an Ultra-Short Silicon Nanowire
Author :
Zuoshan Yin ; Jian Wu ; Jizhao Zang ; Deming Kong ; Jifang Qiu ; Jindan Shi ; Wuyi Li ; Shile Wei ; Jintong Lin
Author_Institution :
State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
We demonstrate an all-optical XOR logic gate for 40-Gbaud quadrature phase-shift keying (QPSK) tributaries in a silicon nanowire for the first time. The XOR logic operation is realized based on four-wave mixing (FWM) in the C-band. Experimental results show negligible power penalty at a bit error ratio (BER) of 10-6 compared with the back-to-back signals. The BER floor appears at BER of 10-6 for both I and Q tributaries of the logic operation, and the main reasons are the optical signal-to-noise ratio (OSNR) deterioration caused by nonlinear loss due to free carrier absorption (FCA) and two-photon absorption (TPA) and the cross-phase modulation (XPM)-induced phase impairments.
Keywords :
elemental semiconductors; integrated optics; multiwave mixing; nanophotonics; nanowires; optical logic; optical losses; optical modulation; optical noise; phase modulation; quadrature phase shift keying; semiconductor quantum wires; silicon; two-photon processes; C-band; FCA; FWM; OSNR; QPSK tributaries; Si; TPA; XPM; all-optical XOR logic gate; bit error ratio; cross-phase modulation; four-wave mixing; free carrier absorption; nonlinear loss; optical signal-to-noise ratio; phase impairments; quadrature phase-shift keying; two-photon absorption; ultrashort silicon nanowire; Bit error rate; Logic gates; Nonlinear optics; Optical fiber amplifiers; Optical filters; Phase shift keying; Silicon; Silicon nanophotonics; four wave mixing; nanowires; ultrafast nonlinear processes;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2014.2319101
