Wavelength Assignment for Multi-Operator PON Sharing
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Solution Overview
Problem
Current PON systems face challenges in supporting multiple operators using the same optical distribution network (ODN) without increasing costs or requiring advanced Dense WDM systems, as existing solutions do not consider network equipment features and may lead to inefficient bandwidth utilization.
Innovation Solution
A wavelength assignment scheme that interleaves upstream and downstream channels across multiple wavelength bands, using coarse WDM technology, allowing non-zero guard bands and aligning channels with CWDM technology to reduce costs and conform to typical GPON or XGPON designs, enabling multiple operators to share the same ODN while maintaining existing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple operators share the same ODN using existing wavelength assignment methods, then cost is reduced, but bandwidth utilization efficiency deteriorates due to lack of consideration for network equipment features
Solution Approach 1:
The patent applies parameter changes by optimizing wavelength assignment parameters to interleave upstream and downstream channels across multiple wavelength bands. This reconfiguration of wavelength parameters improves bandwidth utilization efficiency while maintaining multi-operator sharing capability on the same ODN infrastructure.
Solution Approach 2:
The patent segments the wavelength spectrum into multiple bands and interleaves upstream and downstream channels across these segments. This segmentation approach allows multiple operators to share the ODN efficiently by assigning specific wavelength segments to different operators while maintaining overall system productivity.
2Productivity
If Dense WDM systems are used to support multiple operators, then bandwidth capacity increases, but device complexity and cost increase
Solution Approach 1:
The patent makes the ODN infrastructure universal by enabling multiple operators to share the same physical network using coarse WDM technology. This multi-functional approach allows a single ODN to serve multiple operators with different service requirements without requiring separate Dense WDM systems for each operator, thereby reducing device complexity while maintaining adequate bandwidth capacity.
Solution Approach 2:
The patent employs cost-effective coarse WDM technology instead of expensive Dense WDM systems. By using readily available coarse WDM components and standard PON equipment, the solution achieves multi-operator support at lower cost and complexity, sacrificing some maximum bandwidth capacity for practical economic viability.
3Device complexity
If channels are assigned without interleaving, then device complexity is reduced, but interference between upstream and downstream channels increases
Solution Approach 1:
The patent segments the wavelength spectrum into multiple bands and interleaves upstream and downstream channels across these segments. This segmentation physically separates upstream and downstream transmissions in the wavelength domain, preventing interference while maintaining manageable device complexity through systematic channel assignment.
Solution Approach 2:
The patent resolves interference by moving from a single-dimension channel assignment to a multi-dimensional approach, interleaving channels across multiple wavelength bands. This dimensional expansion in the wavelength domain provides natural isolation between upstream and downstream channels, eliminating interference without increasing device complexity.
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 improves system efficiency, reduces costs, and supports more providers by effectively reusing existing ODN investments, aligning with standard PON system designs and preventing interference through appropriate channel placement and guard bands.
Implementation Method 1
the upstream and downstream channels are interleaved across a plurality of wavelength bands and comprise a sequence of alternating and contiguous upstream and downstream channels, are aligned with a plurality of wavelength division multiplexing (WDM) channels
Implementation Method 2
a plurality of band pass filters arranged and configured to pass a plurality of interleaved upstream and downstream channels
Data Source
AI summary
An apparatus comprising a plurality of optical line terminals (OLTs) corresponding to different providers that share an optical distribution network (ODN), a plurality of optical network units (ONUs) coupled to the OLTs via the same ODN and configured to communicate with the different OLTs using different corresponding pairs of upstream and downstream channels, wherein the upstream and downstream channels are interleaved across a plurality of wavelength bands and comprise a sequence of alternating and contiguous upstream and downstream channels, are aligned with a plurality of wavelength division multiplexing (WDM) channels, and satisfy a plurality of design requirements for the OLTs and ONUs.