Optical Line Terminal Fiber Recognition via Embedded Identification Signals
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Solution Overview
Problem
Current fiber recognition systems require collaboration between two operators, leading to potential misjudgments and high labor costs, especially in long optical network links, and cause service interruptions when adding new users, as they are independent of the OLT device and lack information about the OLT port connected to the fiber.
Innovation Solution
A fiber recognition system where the optical line terminal (OLT) generates and transmits optical signals carrying identification information about the fiber, including port details, using coding schemes like PN sequence and sine signal combination coding, allowing a single operator to identify fibers using a fiber recognition instrument connected to the OLT, eliminating the need for the light source device to be independent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two operators collaborate to recognize fibers by connecting light source device and fiber recognition instrument at both ends, then fiber tracking can be completed, but labor cost increases and misjudgment occurs especially in long optical network links
Solution Approach 1:
The patent extracts the light source function from the independent light source device and integrates it into the OLT device. The OLT generates optical signals with identification information embedded, eliminating the need for a separate light source device at the central office end. This reduces operational complexity while maintaining recognition accuracy through automated signal generation and information embedding.
Solution Approach 2:
The OLT device is enhanced to perform multiple functions: it serves as both the network management device and the light source for fiber recognition. By generating optical signals that carry identification information about OLT ports, the OLT becomes a multi-functional device that eliminates the need for separate recognition equipment at the central office, reducing both device and operational complexity.
2Measurement precision
If independent light source device transmits specific signals for fiber recognition, then fiber identification can be achieved, but information about OLT port connected to fiber cannot be known
Solution Approach 1:
The OLT device preliminarily embeds identification information about OLT ports into the optical signals before transmission. This preliminary action ensures that when the optical signal reaches the fiber recognition instrument, the identification information is already present and can be directly extracted, eliminating information loss and enabling complete fiber traceability from OLT port to remote end.
3Ease of operation
If operator unplugs fiber from OLT port to connect light source device for recognition, then fiber can be identified, but existing user service is interrupted
Solution Approach 1:
The patent merges the fiber recognition function with the existing OLT device and its optical signal transmission capability. By using the OLT's own optical signals that already traverse the fiber connections, the system enables fiber identification without physically disconnecting any fibers. This integration allows recognition operations to proceed while maintaining service continuity for existing users.
Data Source
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AI summary
Embodiments of the present invention disclose a fiber recognition method, an optical line terminal, and a system. The method includes: obtaining, by an optical line terminal, identification information of a fiber connected to an optical line terminal and to be recognized; generating, by the optical line terminal, a data frame that includes the identification information of the fiber to be recognized; transmitting, by the optical line terminal, optical signals that are generated according to the data frame to the fiber to be recognized, so as to make a fiber recognition instrument implement identification for the fiber to be recognized. The present invention can implement fiber recognition easily and conveniently. When a new ONU user is added to a distributed network, service interruption can also be avoided for a user who is normally using a service, and the cost is low.