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Journal Article ONU Discovery Using Multiple Subchannels for Seamless Service Support in Long-Reach OFDMA-PON
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Authors
Hakjeon Bang, Kyeong-Hwan Doo, Jonghyun Lee, Sangsoo Lee
Issue Date
2014-09
Citation
Optics Express, v.22, no.18, pp.22133-22145
ISSN
1094-4087
Publisher
Optical Society of America(OSA)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1364/OE.22.022133
Abstract
In a passive optical network (PON), discovery is a process that detects and registers newly connected optical network units (ONUs). A long-reach PON requires a longer discovery window, e.g., at least 1 ms for 100 km, due to the increased round-trip time between an optical line terminal (OLT) and an ONU. The longer discovery window consumes more network resources and issues longer service-interruption time. From this motivation, for a long-reach orthogonal frequency-division multiple access (OFDMA)-PON, we propose a discovery method using multiple subchannels, where each subchannel consists of one or several subcarrier(s). Compared to discovery using a single channel, the proposed discovery method can increase the number of successfully detected ONUs at the same resources (i.e., for a discovery window) and ensure seamless service support to already registered ONUs, by assigning some subchannels for discovery and the remainder for data transmission. We analyze the discovery efficiency (i.e., the number of successfully detected ONUs in the discovery process) based on a probability and optimize the discovery window size by numerical simulations.
KSP Keywords
Data transmission, Discovery method, Discovery process, Interruption time, Network resources, Numerical simulation(Trnsys16), Optical Line Terminal, Optical Network Units(ONU), Orthogonal frequency division multiple access passive optical network(OFDMA-PON), Passive optical network (pon), Round-trip time(RTT)
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CC BY