Optical Transmission Apparatus Polarization Fluctuation Estimation
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Solution Overview
Problem
Conventional optical transmission systems face challenges in accurately estimating the occurrence portion of polarization state fluctuations in optical fibers, which can lead to errors in polarization demultiplexing due to polarization rotation during signal transmission.
Innovation Solution
An optical transmission apparatus that uses a wavelength light source to output light beams with different wavelengths, a circulator to direct these beams through an optical fiber, and a signal processing circuit to estimate polarization fluctuations by analyzing reflected light, converting time-dependent polarization states into distance-dependent states to identify fluctuation points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical time domain reflectometers (OTDRs) are used to observe polarization state fluctuation, then the occurrence portion of fluctuation can be identified, but the measurement accuracy for short-time fluctuations is insufficient
Solution Approach 1:
The patent uses multiple light beams with different wavelengths to create multiple copies of the measurement process simultaneously. By injecting light beams at multiple wavelengths into the optical fiber and analyzing the reflected light from each wavelength, the system can detect polarization fluctuations at different time points, effectively copying the measurement process to capture short-time fluctuations that a single-wavelength OTDR would miss.
Solution Approach 2:
The patent employs periodic injection of light beams at different wavelengths to systematically probe the optical fiber over time. The signal processing circuit analyzes the reflected light from each wavelength in a periodic sequence, allowing reconstruction of polarization state changes over time and space, thereby improving both measurement precision and temporal resolution.
2Measurement precision
If multiple measurement devices are deployed to improve detection accuracy, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent makes a single optical transmission apparatus perform multiple measurement functions by using multiple light beams with different wavelengths. The same apparatus can measure polarization fluctuations at multiple points along the optical fiber simultaneously by analyzing the reflected light from each wavelength, eliminating the need for multiple separate OTDR devices while maintaining high measurement precision.
Solution Approach 2:
The patent combines multiple measurement capabilities into a single integrated system. By merging the functions of multiple wavelength-specific measurements into one optical transmission apparatus with a signal processing circuit capable of analyzing reflected light from multiple wavelengths, the system achieves the measurement precision of multiple devices without the complexity and cost of deploying separate measurement equipment.
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
This approach allows for accurate estimation of polarization fluctuation occurrences along the optical fiber, reducing the need for multiple measurement devices and lowering costs while maintaining high accuracy in detecting short-time fluctuations.
Implementation Method 1
a light source configured to output a plurality of light beams having different wavelengths to an optical fiber
Implementation Method 2
a receiver configured to receive, from the optical fiber, a reflected light beam corresponding to each of the wavelengths of the plurality of light beams
Implementation Method 3
a signal processing circuit configured to estimate a polarization fluctuation portion based on a polarization state of the received reflected light beam corresponding to each of the plurality of wavelengths
Data Source
AI summary
An optical transmission apparatus, includes, a light source configured to output a plurality of light beams having different wavelengths to an optical fiber, a receiver configured to receive, from the optical fiber, a reflected light beam corresponding to each of the wavelengths of the plurality of light beams, and a signal processing circuit configured to estimate a polarization fluctuation portion based on a polarization state of the received reflected light beam corresponding to each of the plurality of wavelengths.