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Abstract: In this paper, we analyze the survivability of wavelength division multiplexed (WDM) passive optical network (PON). We propose and experimentally demonstrate a novel survivable WDM-PON architecture with self-protection and in-service fault localization capabilities. Two WDM-PONs are combined together and multiple sub-ring architecture is formed. Protection switching is achieved automatically at optical network units (ONUs) when failure occurs. Fiber loss, fiber fault localization and automatic protection switching in each ONU are real-time monitored in central office (CO) without interrupting customer service. No signaling for failure notice or protection switching is required for either CO or ONUs. Extra fibers required for protection are minimized compared with previous protection schemes. The self-protection and in-service fault localization capabilities of the proposed WDM-PON architecture are experimentally verified. [Copyright &y& Elsevier]

Abstract: We have systematically studied the dispersion properties of a 40 channel×10 Gbit/s wavelength division multiplexed (WDM) transmission link using standard single mode fibre with all EDFA amplification, over 30×100 km spans. The dispersion map of the link was investigated by adding fibre sections with positive or negative dispersion at the transmitter, within each amplifier span, and at the receiver. Optimum combinations of these dispersive fibre lengths were found to significantly enhance the overall transmission performance. The dispersion slope mismatch between the transmission fibre and compensation fibre was investigated using the optimal dispersion map. The tolerable range of slope mismatches was found using a post-compensation method for individual channel compensation and overall channel compensation. [Copyright &y& Elsevier]