title: High-speed addition/subtraction/complement/doubling of quaternary numbers using optical nonlinearities and DQPSK signals.
abstract: We propose an innovative approach to implementing multiple arithmetic functions of quaternary numbers using optical nonlinearities and differential quadrature phase-shift keying (DQPSK) signals. By adopting 100 Gbit/s DQPSK signals (A, B) and exploiting nondegenerate four-wave mixing (FWM) for addition/subtraction and degenerate FWM for complement and doubling in a single highly nonlinear fiber, we demonstrate 50 Gbaud/s simultaneous quaternary addition (A+B), dual-directional subtraction (A-B, B-A), complement (-A, -B), and doubling (2B). Power penalties less than 4 dB (addition), 3 dB (dual-directional subtraction), 2 dB (complement), and 3.1 dB (doubling) are observed at a bit-error rate of 10(-9).
authors.affiliation: Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China. jwang@mail.hust.edu.cn
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Scott R
authors.initials: SR
authors.lastname: Nuccio
authors.forename: Jeng-Yuan
authors.initials: JY
authors.lastname: Yang
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Wu
authors.forename: Antonella
authors.initials: A
authors.lastname: Bogoni
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner