Abstract

This paper proposes a novel method for $\mathrm{N}:1$ optical line terminal (OLT) protection on wavelength-division-multiplexing/time-division-multiplexing passive optical networks (WDM/TDM-PONs). The $\mathrm{N}:1$ OLT protection scheme based on in-service wavelength tuning ($\lambda$-tuning) at optical network units (ONUs) provides reliable and cost-effective protection without the need for equipment specific to OLT protection on either the ONU or OLT side. Since the normal multipoint control protocol (MPCP) and backup wavelength pre-assignment are utilized, the proposed method significantly shortens the maximum protection time in $\mathrm{N}:1$ OLT protection. Results of trials on a 40 Gbit/s ($10\mathrm{Gbit}/\mathrm{s}\times 4$ wavelengths) system with 40 km single mode fiber (SMF) transmission show service interruption times of less than 50 ms at all times, even with the practical $\lambda$-tuning time of 30 ms. The system trials also verify that the proposed method assures service interruption times of less than 50 ms, even with the split ratio on a PON of up to 512. These results verify that the proposed method is promising for next-generation multiservice convergence access networks.

© 2015 Optical Society of America

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