On the Fly All-Optical Packet Switching Using Hybrid WDM/OCDMA Labeling

• Published in: Optics communications 2014-02, Vol.312, p.175-184
• Main Authors: Brahmi, Houssem, Giannoulis, G., Menif, Mourad, Katopodis, D., Kalavrouziotis, D., Kouloumentas, Christos, Groumas, Panos, Kanakis, Giannis, Stamatiadis, Christos, Avramopoulos, H., Erasme, Didier
• Format: Article
• Language: English
• Subjects: Engineering Sciences; Optics; Photonic
• ISSN: 0030-4018; 1873-0310

We introduce a novel design of an all-optical packet routing node that allows for the selection and forwarding of optical packets based on the routing information contained in hybrid wavelength division multiplexing/optical code division multiple access (WDM/OCDMA) labels. A stripping paradigm of optical code-label is adopted. The router is built around an optical-code gate that consists in an optical flip–flop controlled by two fiber Bragg grating correlators and is combined with a Mach–Zehnder interferometer (MZI)-based forwarding gate. We experimentally verify the proof-of-principle operation of the proposed self-routing node under NRZ and OCDMA packet traffic conditions. The successful switching of elastic NRZ payload at 40 Gb/s controlled by DS-OCDMA coded labels and the forwarding operation of encoded data using EQC codes are presented. Proper auto-correlation functions are obtained with higher than 8.1 dB contrast ratio, suitable to efficiently trigger the latching device with a contrast ratio of 11.6 dB and switching times below 3.8 ns. Error-free operation is achieved with 1.5 dB penalty for 40 Gb/s NRZ data and with 2.1 dB penalty for DS-OCDMA packets. The scheme can further be applied to large-scale optical packet switching networks by exploiting efficient optical coders allocated at different WDM channels.