PON Wavelength Bonding for Peak Data Rate
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Solution Overview
Problem
Passive Optical Networks (PONs) face challenges in meeting peak data rate demands, as the capacity between an Optical Line Terminal (OLT) and an Optical Network Unit (ONU) often exceeds the maximum capacity of a single wavelength, necessitating the use of multiple wavelengths to increase bandwidth.
Innovation Solution
The configuration of OLT and ONU using an OLT controller to enable wavelength bonding, where multiple wavelengths are assigned and synchronized to transmit data packets, allowing for simultaneous transmission of packet portions across multiple wavelengths, thereby doubling or increasing the effective peak data rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wavelengths are used to increase capacity, then the peak data rate is improved, but the device complexity increases
Solution Approach 1:
The patent segments data packets into multiple portions and transmits them simultaneously across multiple wavelengths (e.g., odd and even words on separate wavelengths). This segmentation allows the peak data rate to double or increase while maintaining manageable complexity through structured division of data flow.
Solution Approach 2:
The patent implements dynamic bandwidth allocation where the OLT controller dynamically assigns wavelengths and configures T-CONTs based on real-time traffic demands. This dynamic approach allows the system to adapt to varying data rate requirements without requiring permanent over-provisioning of complex wavelength bonding configurations.
2Area of stationary object
If multiple wavelengths are bonded together, then the bandwidth is improved, but the configuration and management complexity increases
Solution Approach 1:
The patent creates a universal T-CONT structure that can function in multiple modes: as a single-wavelength container for backward compatibility and as a multi-wavelength bonded container for high-rate services. This multi-functionality simplifies management by using a single container type for both scenarios, eliminating the need for separate configuration mechanisms.
Solution Approach 2:
The OLT controller acts as an intermediary that automatically manages wavelength assignment, T-CONT configuration, and bandwidth allocation. This centralized control simplifies the overall system by consolidating management functions at the OLT, reducing the burden on individual ONUs and simplifying deployment.
3Productivity
If wavelength bonding is implemented, then the peak data rate is doubled, but the latency may increase due to packet segmentation and reassembly
Solution Approach 1:
The patent performs preliminary actions by pre-configuring wavelength assignments and T-CONT mappings before data transmission begins. The OLT controller establishes the wavelength-to-T-CONT associations in advance, so that when packets arrive, they can be immediately segmented and transmitted without delay for configuration setup.
Solution Approach 2:
The patent maintains continuity of useful action by transmitting different portions of packets simultaneously across multiple wavelengths without interruption. The OLT continuously allocates bandwidth across bonded wavelengths, ensuring that data flow remains uninterrupted and latency is minimized while achieving doubled peak data rate.
Data Source
AI summary
Methods, systems, and apparatus for Passive Optical Network (PON) wavelength bonding are disclosed. In one aspect, a first frame of data to a first optical network unit (ONU) is transmitted by an optical line terminal (OLT) over a first wavelength. While the first frame of data is being transmitted to the first ONU over the first wavelength, a first portion of a second frame of data to a second ONU is transmitted by the OLT over a second wavelength. After transmission of the first frame of data over the first wavelength has completed and while the first portion of the second frame of data is still being transmitted to the second ONU over the second wavelength, a second portion of the second frame of data to the second ONU is transmitted by the OLT over the first wavelength.