Optical Fiber Frequency-Modulation Mapping from Scattered-Light Shifts
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Solution Overview
Problem
Existing methods for evaluating optical fiber link noise characteristics require lasers with small optical frequency fluctuations and can only measure frequency modulation of the entire optical transmission line, failing to assess specific sections.
Innovation Solution
A frequency modulation amount measuring device and method that measures optical spectral shift at desired positions in an optical transmission line, calculating frequency modulation amounts using optical spectral shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If end-to-end measurement method is used, then the entire optical transmission line can be measured, but the frequency modulation characteristics in a desired section cannot be measured
Solution Approach 1:
The patent divides the optical transmission line into multiple measurement sections by introducing a movable coupling point. This allows the measurement system to segment the entire fiber link into manageable sections, enabling frequency modulation characteristics to be measured at specific locations rather than only end-to-end. The coupling point can be positioned at different locations along the fiber to create different measurement sections.
Solution Approach 2:
The patent introduces a movable coupling point as an intermediary element between the light source and the optical transmission line. This coupling point acts as a mediator that can be repositioned along the fiber to enable measurement at different sections. The coupling point facilitates section-specific measurement by controlling which portion of the fiber is being measured at any given time.
2Measurement precision
If laser with small optical frequency fluctuations is used, then measurement sensitivity is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces a movable coupling point as an intermediary that enables the use of standard lasers with larger frequency fluctuations. By positioning the coupling point at specific locations, the system can measure frequency modulation characteristics without requiring the laser to maintain extremely stable frequency throughout the entire transmission line, thus reducing laser requirements while maintaining measurement sensitivity.
Solution Approach 2:
The patent changes the measurement approach by measuring optical spectral shift at the coupling point rather than relying on absolute frequency stability of the laser. This parameter change allows the system to measure frequency modulation characteristics using standard lasers with larger frequency fluctuations, as the measurement is based on relative spectral shifts at the coupling point rather than absolute laser frequency stability.
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 the measurement of frequency modulation characteristics distribution along the optical transmission line, identifying sections with poor characteristics without requiring lasers with small optical frequency fluctuations, thus enhancing measurement sensitivity and accuracy.
Implementation Method 1
measuring an optical spectral shift of scattered light at a position in an optical transmission line, and calculating a frequency modulation amount at the position, using the measured optical spectral shift
Data Source
AI summary
The present disclosure relates to a frequency modulation amount measuring device that measures an optical spectral shift of scattered light at a position in an optical transmission line, and calculates a frequency modulation amount at the position, using the measured optical spectral shift.