Polarization Holding Fiber Angle Adjustment via Multi-Wavelength Sensitivity
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Solution Overview
Problem
Existing methods for adjusting the axial angle of a polarization holding fiber in optical receivers face challenges in achieving high accuracy due to limitations in minimizing crosstalk, especially near the minimum point of crosstalk, which affects the optimization of the adjustment process.
Innovation Solution
A method and apparatus that input multiple lights with different wavelengths into a polarization holding fiber, detect their intensities, calculate an adjustment value for the fiber's angle based on the intensity ratio, and adjust the angle accordingly, without relying on crosstalk measurements, using a polarizer and polarization controller to maximize light receiving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If crosstalk measurement method is used to adjust polarization holding fiber angle, then adjustment can be performed, but high adjustment accuracy cannot be achieved near minimum crosstalk point
Solution Approach 1:
The patent changes the measurement parameter from crosstalk (which has a flat minimum making precise adjustment difficult) to light receiving sensitivity (which has a sharp maximum enabling precise adjustment). By measuring the light receiving sensitivity at multiple wavelengths and determining the adjustment value that maximizes this parameter, the system achieves high precision angle adjustment without relying on crosstalk minimization.
2Measurement precision
If master polarization holding fiber is used for crosstalk measurement, then axial angle can be adjusted, but adjustment accuracy is lost when fiber is mounted via PBS component
Solution Approach 1:
The patent extracts the measurement function from the crosstalk measurement method that requires a separate master fiber, and instead uses the light receiving sensitivity of the optical receiver itself as the measurement parameter. This eliminates the need for a master polarization holding fiber and allows direct adjustment of the polarization holding fiber angle even when mounted via PBS component, maintaining both measurement precision and manufacturing ease.
3Device complexity
If single wavelength light is used for adjustment, then measurement is simple, but adjustment precision is insufficient
Solution Approach 1:
The patent segments the measurement process by using multiple wavelengths of light instead of a single wavelength. By inputting lights with different wavelengths (e.g., wavelength1 and wavelength2) and measuring the light receiving sensitivity at each wavelength, the system obtains multiple data points that enable more precise determination of the optimal adjustment value, thereby improving angle adjustment precision while maintaining manageable measurement complexity.
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 precise adjustment of the polarization holding fiber's angle, enhancing the light receiving sensitivity and reducing offset errors, thereby optimizing the polarization alignment without using crosstalk, leading to improved performance in optical receivers.
Implementation Method 1
a polarization holding fiber configured to receive a light emitted from a light source
Implementation Method 2
a polarizer configured to be irradiated with the light output from the polarization holding fiber
Data Source
AI summary
An optical receiver is disclosed. The optical receiver includes a polarization holding fiber configured to receive a light emitted from a light source and a polarizer configured to be irradiated with the light output from the polarization holding fiber. A method for adjusting the optical receiver comprises: inputting a plurality of lights having different wavelengths to a polarization holding fiber; detecting intensities of a plurality of lights output from the polarization holding fiber; calculating an adjustment value for an angle of the polarization holding fiber based on a ratio between the detected intensities of the plurality of lights; and adjusting the angle of the polarization holding fiber based on the calculated adjustment value.