PON Switch Signal Regeneration for Distance and Split Ratio Limits
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Solution Overview
Problem
Current Passive Optical Network (PON) technologies face limitations in network flexibility, signal degradation over distance, and upgradeability, particularly in Fiber To The Home (FTTH) and Fiber To The Building (FTTB) deployments, where signal split ratios and distance constraints limit network capacity and user connectivity.
Innovation Solution
A network switching apparatus with optical ports configured for point-to-multipoint communication according to PON protocols, including converters to switch between optical and Ethernet signals, and a packet switch that forwards data units based on header information, enabling flexible protocol conversion and regeneration of signals to overcome distance and split ratio limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If point-to-multipoint optical communication signals are transmitted over long distances in PON networks, then network coverage is extended, but signal degradation occurs
Solution Approach 1:
The patent introduces an intermediary device (PON switch or OLT with switching capability) that acts as a signal regeneration point in the optical network. This intermediary receives degraded optical signals, converts them to electrical signals for processing and regeneration, then converts them back to optical signals for further transmission. This mediator restores signal quality without requiring complete retransmission, thereby extending network coverage while maintaining signal integrity over long distances.
2Productivity
If high split ratios are used to increase network capacity, then more users can be connected, but signal degradation and network performance deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the optical network into multiple segments or domains, each managed by a PON switch or OLT with switching capability. Instead of using a single high split ratio that causes signal degradation, the network is segmented into multiple lower split ratio domains. Each segment maintains better signal quality, and the overall network capacity is achieved by combining multiple segments. This allows high network capacity while maintaining signal quality through distributed switching and signal regeneration at segment boundaries.
3Adaptability or versatility
If protocol conversion between PON and Ethernet is implemented, then network flexibility and upgradeability are improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing the PON switch or OLT to perform multiple functions within a single device: optical signal reception, electrical signal conversion, packet switching, protocol conversion between PON and Ethernet, and optical signal transmission. By consolidating these functions into a universal device, the patent achieves high network flexibility and upgradeability while managing device complexity through integrated design. The single device can adapt to different network configurations and protocols without requiring separate dedicated components for each function.
Data Source
AI summary
A Passive Optical Network (PON) Switch which breaks down and regenerates a point to multipoint optical communication signals that are compliant with a PON protocol between an Optical Line Terminal (OLT) and an Optical Network Unit (ONU) by performing a conversion between optical communication signals compliant with PON protocol and data units compliant with Ethernet protocol.