PON Coexistence Element for Multi-Band Wavelength Aggregation
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Solution Overview
Problem
Conventional PON systems face challenges in efficiently combining different optical services with non-overlapping wavelength bands, particularly when legacy services migrate to higher data rates, leading to conflicts in wavelength usage.
Innovation Solution
A coexistence element within a passive optical network that includes multiple input communication ports for receiving optical communications across various wavelength bands and an output port to transmit combined optical communications over a single fiber, utilizing wavelength division multiplexing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If legacy services migrate to higher data rates using the same wavelength band, then data rate is improved, but wavelength band conflicts occur with new optical services
Solution Approach 1:
The patent segments the optical fiber transmission capacity by dividing the spectrum into multiple wavelength bands (e.g., C-band and L-band). Legacy services are assigned to one band while new services use another band, allowing simultaneous operation without wavelength conflicts. This segmentation enables both legacy and new services to coexist on the same fiber infrastructure.
Solution Approach 2:
The patent introduces an additional dimension for service differentiation by utilizing multiple wavelength bands instead of relying solely on a single band. By transitioning from single-band to multi-band operation, the system can accommodate both legacy and new services in different spectral dimensions, resolving the wavelength band conflict while maintaining high data rates.
2Adaptability or versatility
If multiple optical services are transmitted over separate optical fibers, then wavelength band conflicts are avoided, but fiber utilization efficiency deteriorates
Solution Approach 1:
The patent merges multiple optical services carrying different wavelength bands into a single optical fiber using wavelength division multiplexing (WDM). The coexistence element combines the C-band and L-band signals from separate input fibers and transmits them through a single output fiber, thereby consolidating fiber usage while maintaining wavelength band compatibility for different services.
Solution Approach 2:
The patent creates a universal optical fiber transmission system that can simultaneously carry multiple wavelength bands and support both legacy and new optical services. The coexistence element acts as a multi-functional device that handles wavelength conversion, multiplexing, and service aggregation, enabling a single fiber to serve multiple purposes and multiple services simultaneously.
3Quantity of substance
If coexistence elements are designed to combine PON services, then fiber utilization is improved, but complexity of handling multiple wavelength bands increases
Solution Approach 1:
The patent introduces a coexistence element as an intermediary device between the optical line terminal and the optical network unit. This mediator handles the complexity of multi-band wavelength management by providing wavelength conversion and multiplexing functions, thereby simplifying the overall system architecture while achieving efficient fiber utilization. The intermediary absorbs the complexity rather than distributing it throughout the network.
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
Enables efficient coexistence and transmission of multiple optical services with different wavelength bands over a single optical fiber, addressing compatibility issues and enhancing fiber utilization.
Implementation Method 1
utilizing wavelength division multiplexing techniques
Data Source
AI summary
A coexistence element within a passive optical network (PON) includes a housing having a plurality of input communication ports. Each input communication port is configured to receive, via a separate optical fiber, optical communications each having a wavelength within a particular wavelength band corresponding to a particular optical service. At least one of the input communication ports is configured to receive optical communications having wavelengths within two or more different wavelength bands. The housing also includes an output communication port configured to transmit, via a single optical fiber, the optical communications from each of the plurality of input communication ports.