Naslov
Optical Coding for Enhanced Real-Time Dynamic Bandwidth Allocation in Passive Optical Networks

Autori
Fouli, Kerim ; Beriša, Tomaž ; Maier, Martin

Izvornik
Journal of lightwave technology (0733-8724) 27 (2009), 23; 5376-5384

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Dynamic bandwidth allocation (DBA); enabling technology; medium access control (MAC); optical coding (OC); passive optical network (PON); polling; quality-of-service (QoS) differentiation; signaling.

Sažetak
In this paper, optical pulse encoding and decoding technology is proposed to enable real-time signaling in a passive optical network (PON) setting. Unique optical codes are assigned to selected optical network units (ONUs) equipped with the corre- sponding encoders. An out-of-band pulse train is broadcast from the optical line terminal (OLT) and is modulated by ONU- based switches. The encoded reflections of pulses are thus used to update the status of the OC-enabled queues at the OLT in real time. We explore the enhanced PON architecture and define its major design parameters. Through extensive simulations, we investigate the design principles and limits of our system parameters. Through a performance comparison of native interleaved polling with adaptive cycle time with its OC- enhanced counterpart, we show that our OC enhancement breaks the fundamental delay lower bound associated to the polling cycle. We propose and investigate new dynamic bandwidth allocation (DBA) algorithms that exploit real-time queue updates enabled through OC-enhanced polling. We also explore the pay-as-you-grow implementation of OC-en- hanced polling to realize quality-of-service (QoS) differentiation, elaborate on possible migration paths from conventional PONs, and investigate absolute QoS performance guarantee improve- ments achieved through OC-enabled real- time DBA algorithms.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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