Wavelength Router Bandwidth Allocation in Passive Optical Networks
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Solution Overview
Problem
Current passive optical networks (PONs) face inefficiencies in bandwidth allocation, particularly in access networks, where demand for higher bandwidth exceeds the capacity provided by existing solutions like Power-Splitting PONs and WDM PONs, leading to bottlenecks and increased costs for network operators.
Innovation Solution
A method for transmitting traffic in multiple PONs by using multiple wavelengths, where subsets of ONUs share specific wavelengths across different PONs, allowing for dynamic bandwidth allocation based on usage patterns, thereby optimizing bandwidth usage without the need for extensive upgrades or additional transmitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wavelength division multiplexing PON (WDMPON) is used to increase downstream capacity dramatically, then bandwidth capacity is improved, but cost increases prohibitively and capacity far exceeds current demand
Solution Approach 1:
The patent applies universality by enabling a single PON infrastructure to serve multiple functions and multiple PONs simultaneously. By allowing ONUs from different PONs to share wavelengths dynamically, the system achieves multi-functionality where the same physical infrastructure supports multiple logical networks with different bandwidth requirements, eliminating the need for separate dedicated wavelengths for each PON.
Solution Approach 2:
The patent implements dynamics through dynamic bandwidth allocation where subsets of ONUs can share specific wavelengths based on real-time usage patterns. The system dynamically adjusts which ONUs access which wavelengths at different times, allowing business and residential PONs to share infrastructure efficiently without requiring static dedicated wavelengths for each PON type.
2Productivity
If Power-Splitting PONs are used to provide greater bandwidth at the access network, then bandwidth is improved compared to copper networks, but demand continues to grow for higher bandwidth beyond what PSPONs can provide
Solution Approach 1:
The patent enables the access network infrastructure to serve multiple PONs and multiple wavelength requirements simultaneously. By allowing wavelength sharing across different PONs with different bandwidth demands, the system achieves versatility in accommodating various bandwidth requirements without requiring separate dedicated infrastructure for each PON.
Solution Approach 2:
The system dynamically allocates wavelength resources based on actual bandwidth demand. Business PONs and residential PONs can share wavelengths at different times based on their usage patterns, allowing the network to adapt to growing bandwidth demands without requiring proportional increases in physical infrastructure.
3Productivity
If hybrid PON (HPON) is used to increase downstream capacity between PSPON and WDMPON, then bandwidth is improved, but some operators believe HPONs provide greater bandwidth than presently desired and seek upgrade solutions that more closely meet bandwidth needs
Solution Approach 1:
The patent implements dynamic bandwidth allocation where operators can adjust wavelength sharing arrangements based on actual demand. Subsets of ONUs can share wavelengths during specific time periods, allowing operators to fine-tune bandwidth allocation to match actual usage patterns rather than providing fixed over-provisioned capacity.
Solution Approach 2:
The system allows dynamic changes in bandwidth allocation parameters by adjusting which ONUs share which wavelengths at different times. This enables operators to modify bandwidth distribution without changing the physical infrastructure, allowing precise matching of bandwidth provision to actual demand patterns.
Data Source
AI summary
In accordance with the teachings of the present invention, a system and method for transmitting traffic in a plurality of passive optical networks (PONs) is provided. In a particular embodiment, a method for transmitting traffic in a plurality of passive optical networks (PONs) includes transmitting traffic at a first wavelength and at a second wavelength from an optical line terminal (OLT). The method also includes combining the traffic in the first wavelength and the traffic in the second wavelength and splitting the combined traffic into a plurality of copies. The method further includes forwarding a first copy to a first wavelength router at a first distribution node and forwarding a second copy to a second wavelength router at a second distribution node, wherein the first wavelength router is coupled to a first set of optical network units (ONUs) and the second wavelength router is coupled to a second set of ONUs. The method additionally includes routing the first copy such that only a subset of one or more ONUs in the first set of ONUs receives the traffic in the first wavelength and only a subset of one or more ONUs in the first set of ONUs receives the traffic in the second wavelength. The method also includes routing the second copy such that only a subset of one or more ONUs in the second set of ONUs receives the traffic in the first wavelength and only a subset of one or more ONUs in the second set of ONUs receives the traffic in the second wavelength.