Toward Low-Latency Services over PON using OCDMA Private Networks
Steevy J. Cordette
TL;DR
Addressing ultra-low-latency requirements in passive optical networks, the paper proposes OCDMA-based multiple private networks to implement Virtual GE-PONs that emulate service-based VLANs in the optical domain. The core idea is to assign a unique OCDMA codeword to each private network, enabling PN-confined communications and distributing the access delay across virtualized DBAs. The strategy introduces a dual-geometry traffic partition—LLV-GE-PON for latency-sensitive flows and HLV-GE-PON for non-critical or quiet-time tasks—thus reducing DBA-induced delays and potentially eliminating the standard ONU discovery quiet windows. The approach leverages known MAI performance trade-offs and thresholding for larger PN counts, aiming to deliver near-zero additional latency for critical services in future PON deployments. Overall, the proposed architecture promises to improve URLLC provisioning over GE-PON by offering virtualized, per-service private networks with dedicated DBA and traffic steering.
Abstract
An low-latency service scheme is proposed over Passive Optical Network (PON). The Optical Code Division Multiplexing Access (OCDMA) technique is used to define multiple private networks serving as Virtual GE-PON that mimic the service-based VLAN (S-VLAN) in the optical domain.