Optical Splitter Branching Ratio Adjustment for PON Ranging
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Solution Overview
Problem
Conventional PON systems face challenges in maintaining optimal reception sensitivity when a new ONU is connected, leading to difficulties in ranging due to the adjustable branching ratio of optical splitters, especially in uneven user distributions.
Innovation Solution
An optical communication system with a single unequal branch optical splitter capable of varying its branching ratio, coordinated with a control apparatus to adjust the light branching ratio automatically upon new ONU connection, ensuring proper ranging and extending transmission distances or increasing connectible users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the branching ratio of the optical splitter is adjusted to extend transmission distance or increase connectible users, then the transmission reach or number of connectible users is improved, but reception sensitivity deteriorates
Solution Approach 1:
The optical splitter is designed with dynamically adjustable branching ratios, allowing the system to adapt the light distribution according to the actual number of connected ONUs and their distances from the OLT. This dynamic adjustment capability enables the system to optimize both transmission distance and reception sensitivity under different operating conditions, resolving the contradiction between extending transmission reach and maintaining reception quality.
Solution Approach 2:
The system changes the branching ratio parameter of the optical splitter based on the detected number of connected ONUs and their ranging distances. By adjusting this key parameter, the system can extend transmission distance when needed while maintaining adequate reception sensitivity, thus resolving the technical contradiction between these two opposing requirements.
2Reliability
If the branching ratio is fixed to maintain reception sensitivity, then reception sensitivity is improved, but adaptability to new ONU connections deteriorates
Solution Approach 1:
The system automatically detects when a new ONU is connected through the ranging function, measures the transmission distance, and autonomously adjusts the branching ratio of the optical splitter without requiring manual intervention. This self-service capability ensures both maintained reception sensitivity and adaptability to new connections, as the system dynamically optimizes itself based on real-time network conditions.
Solution Approach 2:
The system uses the ranging function to obtain feedback information about the number of connected ONUs and their distances from the OLT. Based on this feedback, the control apparatus automatically adjusts the branching ratio to maintain optimal reception sensitivity while adapting to new connections. This closed-loop feedback mechanism resolves the contradiction between fixed performance and adaptability.
3Reliability
If manual adjustment of branching ratio is performed, then reception sensitivity is optimized, but operation complexity increases
Solution Approach 1:
The system performs automatic detection and adjustment of the branching ratio using the ranging function and control apparatus, completely eliminating the need for manual intervention. This automation maintains optimal reception sensitivity while significantly reducing operation complexity, as the system self-configures based on the actual number of connected ONUs and their distances.
Data Source
AI summary
In order to solve the problems described above, an object of the present invention is to provide an optical communication system and a control method that automatically adjust a branching ratio of an optical splitter in accordance with a connection of a new ONU. An optical communication system according to the present invention causes an operation system or a DBA (Dynamic Bandwidth Allocation) function and a determining unit of a branching ratio of an optical splitter to cooperate with each other, adjusts the branching ratio so as to enable ranging with an active ONU, and takes into consideration an initial connection sequence through which an ONU is newly connected.