Optical Fiber Identifier Using AC-Coupling for High-Speed Signal Detection
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Solution Overview
Problem
Conventional Optical Fiber Identifiers (OFIs) are inadequate for detecting high-speed signals in new fiber optic communication systems, such as passive optical networks, due to limited bandwidth and sensitivity, leading to inaccurate detection of disconnected fibers and increased disruption in service.
Innovation Solution
A new Optical Fiber Identifier with enhanced sensitivity and bandwidth, capable of distinguishing between upstream and downstream signals by using AC-coupling, filters, and power detectors to accurately identify high-speed signals, and a plunger mechanism for bending fibers to prevent ambient light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional OFI bandwidth is limited to 0-2 Khz for detecting low-speed signals, then sensitivity for low-speed signals is improved, but the ability to detect high-speed signals deteriorates
Solution Approach 1:
The patent implements dynamically adjustable bandwidth filtering that can adapt between narrowband (0-2 Khz) mode for low-speed signal detection and wideband mode for high-speed signal detection. The filter bandwidth is changed based on the detected signal characteristics, allowing the device to optimize sensitivity for the current operating conditions while maintaining versatility across different signal types.
Solution Approach 2:
The patent changes the operational parameters of the OFI by adjusting the filter bandwidth and coupling method (AC vs DC) based on the signal being detected. For high-speed signals, the bandwidth parameter is increased and AC-coupling is used, while for low-speed signals, the bandwidth is reduced and DC-coupling is used, thereby resolving the contradiction between sensitivity and adaptability.
2Measurement precision
If DC-coupling is used to increase sensitivity for low-frequency signals, then sensitivity is improved, but the ability to handle high-speed signals deteriorates
Solution Approach 1:
The patent dynamically switches between DC-coupling and AC-coupling modes based on the signal frequency. For low-frequency signals, DC-coupling is activated to maximize sensitivity. For high-speed signals, AC-coupling is activated to maintain the ability to detect rapid signal changes, thereby resolving the contradiction between sensitivity and detection speed through dynamic mode switching.
Solution Approach 2:
The patent changes the coupling parameter of the detection circuit based on the signal characteristics. The coupling method is adjusted from DC to AC depending on the signal bandwidth, allowing the system to optimize both sensitivity for low-frequency signals and speed for high-speed signals by parameter adaptation rather than fixed configuration.
3Device complexity
If conventional OFI is used for high-speed signal detection, then device simplicity is maintained, but detection accuracy for high-speed signals deteriorates
Solution Approach 1:
The patent enhances the OFI with multi-functionality by adding adjustable bandwidth filtering and selectable coupling methods (AC/DC) to a single device. This allows the same device to accurately detect both low-speed and high-speed signals without requiring separate specialized instruments, thereby improving detection accuracy while maintaining relative device simplicity through integrated multi-functional design.
Solution Approach 2:
The patent introduces dynamic control capabilities (adjustable filter bandwidth and coupling mode switching) that allow the device to adapt its complexity level based on the detection task. For simple low-speed signal detection, the device operates in a simpler mode, while for high-speed signals, it automatically configures more complex filtering and coupling parameters, thus improving accuracy without permanently increasing device complexity.
4Speed
If high bandwidth is used to detect high-speed signals, then detection capability for high-speed signals is improved, but electrical noise increases
Solution Approach 1:
The patent dynamically adjusts the filter bandwidth parameter based on the detected signal characteristics. When high-speed signals are detected, the bandwidth is increased to capture the signal content. When only low-speed signals are present, the bandwidth is reduced to minimize electrical noise. This adaptive parameter adjustment resolves the contradiction between detection capability and noise generation by making noise minimization a dynamic rather than static design constraint.
Solution Approach 2:
The patent implements dynamic bandwidth filtering that can switch between narrow and wide bandwidth modes based on real-time signal analysis. This dynamic approach allows the system to optimize the trade-off between signal detection capability and electrical noise by adjusting the filter characteristics in response to the actual signal being detected, rather than being fixed at a high bandwidth that would continuously generate excess noise.
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 high-speed signals, reducing the time and cost associated with identifying disconnected fibers, minimizing service disruptions, and improving network management by accurately tracking connected and disconnected lines.
Implementation Method 1
A plunger is provided which can be moved towards the detecting portion to bend the optical fiber
Implementation Method 2
a detecting portion that detects a signal originating from a first end of the optical fiber and a signal originating from a second end of the optical fiber
Data Source
AI summary
Provided is a signal identifying apparatus for an optical fiber that includes a detecting portion capable of detecting a signal originating from a first end of the optical fiber and a signal originating from a second end of the optical fiber. Additionally, the signal identifying apparatus includes an identifying portion that identifies a desired signal by separating the signal originating from the first end of the optical fiber from the signal originating from the second end of the optical fiber.