Survivable network architectures for WDM PON

In-Service Fault Localization in WDM Passive Optical Networks

“…Two WDM-PONs can be mutually protected and fiber loss of the two WDM-PONs can be monitored simultaneously. Protection fibers in our case can be minimized as compared with previous self-protection schemes [1,2]. Fiber failure localization and automatic protection switching monitoring in ONUs are realized at CO in real-time without interrupting customer service after failure has occurred.…”

“…Service will be interrupted during fiber fault localization process after a fiber link failure. Some self-protection schemes [1,2,6] have been proposed to provide uninterruptible service based on their presented network architectures. However, no real-time cost effective inservice fault localization scheme has been reported.…”

“…Automatic protection switching in ONUs provides uninterruptible service for PON subscribers in case of fiber failure. Protection fibers are minimized compared with previous schemes [1,2]. A fault monitoring unit located at central office (CO) can locate fiber failure and monitor automatic protection switching in ONUs in real-time when fiber failure occurs.…”

A novel survivable WDM passive optical networks

“…Recently, a large number of self-protection schemes have been proposed [10]- [18]. These protection schemes are designed to protect feeder fiber and/or distribution fibers for WDMPONs.…”

“…The protection schemes mentioned above are single-PON based protection scheme. In order to improve protection efficiency, multiple-PON based mutually protected scheme was also proposed in [17,18]. In these schemes, multiple PONs are connected by extra fibers and protected mutually.…”