## Abstract

A multifunctional optical signal processing scheme for 10-Gbaud quadrature phase shift keying (QPSK) and binary phase shift keying (BPSK) signals based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF) is proposed. Wavelength-division-multiplexing (WDM) multicast, wavelength conversion, modulation format conversion, and hybrid modulation format exclusive-OR (HMF-XOR) logic gates are realized simultaneously by simulation. One-to-three WDM multicast of 20-Gbps QPSK signals are achieved paying the optical signal-to-noise ratio (OSNR) penalties $<0.8\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{dB}$ at the bit error rate (BER) of ${10}^{-3}$. The converted BPSK signals with high performance are obtained; they are generated from wavelength conversion of 10-Gbps BPSK and format conversion from 20-Gpbs QPSK. In the case of HFM-XOR logic gates, we discuss the extension application in all-optical encryption. Therefore, both theoretical analysis and simulation results are conducted to analyze the feasibility of the dual-channel all-optical encryption for QPSK and BPSK signals. The OSNR penalties of decrypted QPSK and BPSK signals at the BER of ${10}^{-3}$ are 1 dB and 0.7 dB, respectively. The concentrated constellations and clear eye diagrams indicate the high performance of decrypted signals.

© 2018 Optical Society of America

Full Article | PDF Article**OSA Recommended Articles**

Danshi Wang, Min Zhang, Jun Qin, Guo-Wei Lu, Hongxiang Wang, and Shanguo Huang

Opt. Express **22**(18) 21847-21858 (2014)

Min Zhang, Yue Cui, Yueying Zhan, Zhiguo Zhang, and Xue Chen

Appl. Opt. **54**(25) 7813-7819 (2015)

Guo-Wei Lu, Jun Qin, Hongxiang Wang, XuYuefeng Ji, Gazi Mohammad Sharif, and Shigeru Yamaguchi

Opt. Express **24**(3) 2299-2306 (2016)