Fiber-Enabled Backfeed Network Architecture for HFC Upgrades
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Solution Overview
Problem
The existing Hybrid Fiber-Coax (HFC) network architecture faces challenges in meeting growing bandwidth demands due to limited capacity and the need for costly and time-consuming upgrades to Fiber-to-the-Home (FTTH) architecture, with significant transitory costs and downtime associated with migrating to Node+0 (N+0) architecture.
Innovation Solution
A novel network architecture that gradually upgrades to an N+0 system with reduced transitory costs, achieved by converting existing HFC networks to a Fiber-Enabled Backfeed (BFF) topology, where fiber is extended deeper into the network, removing active RF amplifiers, and using compact nodes with Gray Optics Aggregation, allowing for increased modulations and frequencies, and reducing the number of active elements and tap faceplate changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If HFC network is upgraded to FTTH architecture to meet growing bandwidth demands, then network capacity is improved, but upgrade costs and time increase significantly
Solution Approach 1:
The patent extends fiber optic cables deeper into the HFC network ahead of time, creating a Fiber-Enabled Backfeed architecture that prepares the infrastructure for future N+0 deployment. By pre-installing fiber to amplifier locations and converting them to compact nodes, the network is upgraded incrementally without requiring complete replacement, thus reducing both upgrade time and costs while still achieving enhanced network capacity.
2Quantity of substance
If HFC network is migrated to N+0 architecture by removing all RF amplifiers, then network capacity is improved, but transitory costs and service disruption increase
Solution Approach 1:
Instead of immediately removing all RF amplifiers in a complete N+0 migration, the patent implements a partial action by converting only selected amplifiers to compact nodes at strategic locations. This incremental approach allows the network to achieve enhanced capacity in served areas while maintaining backward compatibility and service continuity in other areas, avoiding the transitory costs and disruptions of a full network overhaul.
3Quantity of substance
If fiber is extended deeper into HFC network to compact nodes, then network capacity is improved, but device complexity increases
Solution Approach 1:
The patent designs compact nodes that perform multiple functions: they serve as optical network units (ONUs) for fiber-to-coax conversion, RF amplifiers for signal boosting, and backfeed transmitters for upstream communication. By consolidating these functions into single multi-functional devices, the architecture achieves enhanced network capacity without proportionally increasing device complexity, as each compact node replaces multiple separate components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the number of active elements and tap faceplate changes, lowers upgrade costs and time, and enhances network capacity, enabling future bandwidth expansions while minimizing disruption to existing services.
Implementation Method 1
an optical network unit (ONU) portion (82) connected to two RF modules (84, 86)
Implementation Method 2
a laser (94) receives signals from WDM (90) and forwards them to the RF module (84)
Implementation Method 3
which includes a wavelength division multiplexer (90) that multiplexes/demultiplexes received signals into various frequency bands
Data Source
AI summary
A CATV system having an aggregator node and at least one compact node. The aggregator node receives downstream signals from a head end and sends upstream signals to the head end. The at least one compact node receives downstream signals from the aggregator node and send upstream signals to the aggregator node. The at least one compact node sends the downstream signal received from the aggregator node to a subscriber positioned in the upstream direction relative to the compact node.