English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The FTTH (Fiber To The Home) market currently needs new network maintenancetechnologies that can, economically and effectively, cope with massive fiberplants. However, operating these networks requires adequate means for aneffective monitoring cost. Especially for troubleshooting faults that areassociated with the possibility of remote identification of fiber breaks, whichmay exist in the network. Optical Time Domain Reflectometry (OTDR) techniquesare widely used in point-to-point optical network topologies. Nevertheless, ithas major limitations in tree-structured PONs (Passive Optical Networks), whereall different branches backscatter the light in just one conventional OTDRtrace with combined signals arriving on the OLT (Optical Line Terminal) side.Furthermore, passive power splitters used in FTTH networks input largeattenuation, impoverishing the reflected signal. This makes the identificationof the very branch affected by the problem practically impossible, whenconsidering conventional analyses. The use of constraint-based techniques havebeen applied in a large amount of applications for Engineering Design, wherethe duties imposed for graphics and equations constraints result in valuedfeatures to CAD/CAE software capabilities. Currently, it provides a fasterdecision making capacity for engineers. This work applies the constraint basedapproach along with a Differential Evolutionary Algorithm to separate thesuperimposed OTDR signals, after the splitters of a FTTH Passive OpticalNetworks. This research introduces a new set of algorithms performing acoupling to an Optical Network (ON) CAD Design with its correspondent OTDRmeasurement signal, considering its geographical distribution branches ofdifferent lengths after the splitter. Results of this work are presented in aFTTN (Fiber To The Node) prototype arrangement, using a 1:8 passive powersplitter.

Applying a Differential Evolutionary Algorithm to a Constraint-based  System to support Separation of OTDR Superimposed Signal after Passive  Optical Network Splitters