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A DWDM/SCM self-healing architecture for broad-band subscriber networks

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3 Author(s)
Wen-Piao Lin ; Dept. of Electron. Eng., Chien Kuo Inst. of Technol., Changhua, Taiwan ; Ming-Seng Kao ; S. Chi

A high-capacity dense wavelength-division multiplexing/subcarrier multiplexing (DWDM/SCM) network based on a self-healing star-bus-ring architecture (SBRA) is proposed and demonstrated. This architecture has a star subnet on the upper level to be a high-capacity infrastructure for the network, several bus subnets on the middle level to offer broad-band channels for multiwavelength signals, and many ring subnets on the lower level to serve a number of nodes. We design remote nodes and bidirectional wavelength add-drop multiplexers (WADMs) by using simple optical switches to reconfigure the network under link failure. We further employ M-quadrature amplitude modulation (M-QAM) and frequency shift-keyed (FSK) signals for downstream and upstream channels, respectively. The SBRA ensures an optical-beat-interference-free (OBI-free) and high-reliability optical network. Finally, we set up an experimental network to demonstrate the feasibility of the proposed architecture.

Published in:

Journal of Lightwave Technology  (Volume:21 ,  Issue: 2 )