Inter-OLT Communication via Integrated ONU for PON Interference
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Solution Overview
Problem
Multi-OLT passive optical networks face challenges in coordination and control, particularly in detecting and mitigating interference between OLTs, which affects upstream and downstream communications.
Innovation Solution
The system employs integrated ONUs within OLTs to detect interference by identifying rogue OLTs and transmitting corrective messages via well-defined PON management channels, allowing peer-to-peer communication between OLTs to resolve wavelength conflicts and maintain network integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple OLTs are deployed in a PON system to enable service provider sharing, then network capacity and service diversity are improved, but coordination complexity and interference control difficulty increase
Solution Approach 1:
The patent introduces an integrated ONU within each OLT that acts as an intermediary for inter-OLT communication. This intermediary component enables coordinated operation between multiple OLTs by handling wavelength assignment, interference detection, and control message exchange, thereby reducing the coordination complexity that would otherwise burden the OLTs directly
2Reliability
If OLTs transmit on different wavelengths to avoid interference, then communication reliability is improved, but wavelength allocation complexity and detection difficulty increase
Solution Approach 1:
The patent implements a feedback mechanism where the integrated ONU continuously monitors the optical spectrum for interference signals and reports back to the OLT. This feedback loop enables automatic detection of wavelength conflicts and triggers corrective actions such as wavelength reassignment, maintaining communication reliability while simplifying the detection process through automated monitoring
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 solution effectively mitigates interference by enabling OLTs to communicate and correct wavelength misconfigurations, ensuring reliable upstream and downstream data transmission in multi-OLT PON systems.
Implementation Method 1
a first OLT transceiver... a second OLT transceiver... determine an upstream wavelength corresponding to a second OLT... transmit data to the second OLT by the first OLT via the first ONU
Data Source
AI summary
A system comprising a first optical line terminal (OLT) comprising a first integrated optical network unit (ONU), and a first OLT transceiver, and a second OLT coupled to the first OLT, wherein the second OLT comprises a second integrated ONU, and a second OLT transceiver. Included is a first OLT comprising an optical transceiver, at least one processor coupled to the optical transceiver, wherein the processor working in conjunction with the optical transceiver is configured to determine an upstream wavelength corresponding to a second OLT, join, via a first ONU in the first OLT, the second OLT using the upstream wavelength corresponding to the second OLT, and transmit data to the second OLT by the first OLT via the first ONU, wherein the second OLT comprises a second ONU.