A 10 Gb/s Passive-Components-based WDM-TDM Reconfigurable Optical Access Network Architecture

Abstract

Abstract:We propose a cost-effective, reconfigurable optical access network by employing passive components in the remote node and dual conventional optical transceivers in ONUs. The architecture is demonstrated with bidirectional transmission at 10 Gb/s.

Flexible TDMA/WDMA passive optical network: Energy efficient next-generation optical access solution

“…The passive components based reconfigurable remote node designs are proposed in [25]. The authors of [25] propose passive reconfigurable optical access network (PROAN) in which ONUs are relocated in a subset of two wavelength pairs (each pair contains a downstream and an upstream wavelength). These subsets overlap cyclically in order to enable flexible bandwidth rearrangement.…”

“…The passive components based reconfigurability, however, imposes a higher insertion loss penalty. The active components based re-configurable solutions are proposed in [26] and [27]. The solution proposed in [26] uses an array of SOAs to provide a fully flexible solution.…”

Flexibility Level Adjustment in Reconfigurable WDM-TDM Optical Access Networks

“…In the first option, the ONU selects the working wavelength channel among several or all wavelength channels by tunable filters (for downstream) and tunable lasers (for upstream). The passive RN can broadcast [15] or multicast wavelength channels to ONUs [16], [17]. This option allows the use of passive ODN but requires expensive ONUs and excessive power budget.…”

“…However, the ONU reallocation time is not always zero and not the same for different architectures and depends on the protocol employed. For instance, the ONU reallocation time can be zero if a make-before-break reallocation can be realized in the architecture proposed in [16]. In other architectures, the reallocation time cannot be zero as the laser tuning time should be considered.…”

“…This fact supports the need for reconfigurable 0733-8724/$31.00 © 2012 IEEE Reconfigurability comes with certain complexities, implying higher costs, which up to now is the biggest obstacle to enable flexibility in WDM-TDM PONs. In the literature, there are extensive studies proposing reconfigurable architectures focusing on functionality [13]- [15], cost-effectiveness [16], [17], migration [18], and the enabling devices [19]. These architectures certainly have different levels of flexibility, thus leading to different performance and cost.…”