Passive Optical Cross-Connection Network Latency Reduction
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Solution Overview
Problem
Current optical networks face challenges in reducing latency and network failures, as they rely on electronic cross-connects that are slow and costly, and existing optical switch designs are limited by their scalability and performance.
Innovation Solution
The implementation of passive optical cross-connection networks (POCXN) using a distributed architecture with passive optical splitters and interconnection stages that automatically distribute signals to all nodes without switching functions, combined with a High-Efficiency Distributed Access Protocol (HEDAP) for efficient data transfer and latency reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electronic cross-connects are used for optical switching, then signal routing capability is provided, but latency increases and cost increases
Solution Approach 1:
The patent replaces electronic switching mechanisms with purely optical switching using passive optical components (splitters, combiners, and optical paths). This substitution eliminates electronic-to-optical conversion delays and electronic signal processing latency, achieving lower latency optical switching while maintaining routing capability through optical domain operations.
Solution Approach 2:
The invention extracts and removes the active electronic switching fabric from the optical network architecture. By eliminating electronic cross-connects and their associated conversion processes, the system achieves direct optical switching with reduced latency, using only passive optical components to perform switching functions.
2Adaptability or versatility
If active electronic switches are deployed, then dynamic routing is achieved, but device complexity and cost increase
Solution Approach 1:
The passive optical network implements self-service through distributed addressing and routing protocols where each node independently determines its own routing path based on destination addresses. This eliminates the need for complex centralized electronic switching fabrics, reducing device complexity while maintaining routing flexibility through protocol-based address resolution and path selection.
Solution Approach 2:
The patent transitions from spatial switching in electronic fabrics to a different dimensional approach using optical time-division multiplexing and wavelength-division multiplexing. Routing flexibility is achieved through temporal and spectral dimensions rather than spatial electron beam deflection, simplifying the physical switching fabric while maintaining adaptability.
3Productivity
If optical switching is implemented, then bandwidth utilization improves, but network architecture complexity increases
Solution Approach 1:
The patent segments the optical network into hierarchical layers: passive optical access layer using splitters and combiners for broadcast/done, and higher-layer optical core for routed traffic. This segmentation allows bandwidth-efficient optical switching at the core while using simple passive components at the access layer, managing overall architecture complexity through functional decomposition.
Data Source
AI summary
Optical networking has become ubiquitous in providing low cost, high speed communications networks supporting our communication needs from FTTH through long haul to undersea. The large number of users and high speeds provided to each user fiber mean that information retrieval and routing functionality within the data centers hosting this information can become the bottleneck both in terms of speed and latency. According to embodiments of the invention the inventors present architectures based upon all-optical passive optical networks that support a distributive approach to latency reduction as well as protocols relating to their deployment. Beneficially, such POCXN concepts exploit optical components already supported by high volume manufacturing techniques as well as CWDM/DWDM techniques for throughput increase.