OSC Polarization Detection for High-Resolution Fiber Event Sensing
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Solution Overview
Problem
Existing optical sensing technologies in communication networks struggle with high costs and limited spatial resolution in detecting environmental disturbances due to background noise and lack of spatial information, making it difficult to accurately detect events like earthquakes and vibrations in optical fibers.
Innovation Solution
A detection device utilizing non-coherent detection of optical supervisory channel (OSC) signals to determine the state of polarization (SOP) in optical fiber spans, integrating with existing OSC modules for cost-effective high spatial resolution event detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coherent transmission systems are used to obtain SOP information for event detection, then event detection capability is improved, but the system becomes susceptible to background noise interference and provides limited spatial information
Solution Approach 1:
The patent extracts only the necessary SOP information from the OSC signal through non-coherent detection, separating the useful polarization state data from the noisy coherent transmission system. This allows event detection to be performed using only the essential parameters without being affected by background noise from the main data transmission.
2Reliability
If specialized equipment is used to generate light pulses for OTDR technology, then fiber fault detection capability is improved, but system cost and complexity increase
Solution Approach 1:
The patent makes the OSC signal serve multiple functions: it carries both data transmission information and SOP sensing information. By using the existing OSC infrastructure for dual purposes, the system eliminates the need for specialized detection equipment while maintaining fiber event detection capability.
Solution Approach 2:
The OSC signal automatically provides sensing functionality without requiring external specialized equipment. The existing OSC infrastructure serves itself by enabling SOP-based event detection through non-coherent detection, eliminating the need for separate fault detection systems.
3Device complexity
If non-coherent detection is used on OSC signals, then system cost and complexity are reduced, but measurement precision of SOP information may be affected
Solution Approach 1:
The patent changes the detection parameter from coherent detection to non-coherent detection, which simplifies the system architecture. Despite this parameter change, the system maintains sufficient measurement precision by focusing on SOP tracking for event detection rather than requiring full coherent signal reconstruction.
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 accurate detection of environmental events with high spatial resolution by directly detecting OSC signals, reducing complexity and cost while improving event detection capabilities in optical networks.
Implementation Method 1
a polarization beam splitter for decomposing at least a portion of the OSC signal into a first sensing signal and a second sensing signal, wherein the first sensing signal and the second sensing signal have a first polarization direction and a second polarization direction, respectively
Implementation Method 2
each of the first detector, second detector, and third detector may comprise a photoelectric conversion device and a power meter
Data Source
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AI summary
An optical network system and a signal detection device, a detection method, a computer-readable medium, and a computer program product applied therein are disclosed. An exemplary detection device may comprise: a receiving module configured to receive optical supervisory channel (OSC) signals transmitted via an optical fiber span; a sensing module connected to the receiving module, configured to perform a non-coherent detection on at least a portion of the OSC signal; and a signal processing module configured to determine the state of polarization (SOP) information of the OSC signal based on the results of the non-coherent detection.