Roland Lieger

Fully-passive resiliency switch for agile PON restoration

We present a network recovery concept based on fully-passive inline demarcation nodes powered through energy scavenging at low optical feed level of -10dBm. Protection switching in 10.7 ms is experimentally demonstrated at the PON feeder.

Passive ROADM Flexibility in Optical Access With Spectral and Spatial Reconfigurability

An energy-aware solution for physical-layer reconfigurability in metro-access networks is presented. The dynamicity of optical switching is introduced in nodes that are perceived as fully-passive by the network. Energy scavenging at low optical feed level of -10dBm supports field-deployment without local electrical power supply. Two types of network nodes are demonstrated experimentally. First, a resilience node is evaluated for fast protection switching in 10.7 ms at the feeder segment. Optical switching is further exploited for the purpose of dynamic allocation of spectral slices and routing in a new class of reconfigurable optical add-drop multiplexer. The spectral bandwidth of drop segments can be extended on demand while intranetwork communication among different segments of the access network is also enabled. Finally, we discuss the potential for realizing self-powering by means of tapping optical signals traversing the access network rather than utilizing a dedicated pump source.

Fully passive resiliency node for optical access [Invited]

A novel resiliency node for access network restoration is presented. Rather than using electrically powered nodes in an otherwise fully passive fiber plant, the proposed node is optically fed. The incorporation of energy scavenging mechanisms and optoelectronics with low power consumption guarantee operation at low optical feed levels of -10 dBm. Feeder protection for optical access is experimentally demonstrated that features a fast switching time of 10.7 ms in interaction with a control plane. Finally we identify options for self-pumping of the network node through simple optical power tapping of feeder and drop signals.

Fully-passive ROADM for flexible in metro-access networks

A virtually passive ROADM for dynamic spectrum allocation and lightpath provisioning among drop ports is experimentally demonstrated. Passiveness is granted by means of energy harvesting at a low optical feed level of -9 dBm.