High-order optical fiber multi-wavelength filter continuous tuning
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Solution Overview
Problem
High-order optical fiber multi-wavelength filters with two or more birefringent elements face challenges in achieving continuous wavelength tuning due to complexity in detecting appropriate combinations of wave plates and birefringent elements, making it difficult to efficiently process optical signals in optical network systems.
Innovation Solution
A high-order optical fiber multi-wavelength filter is designed with a polarization beam splitter, pairs of polarization controllers including wave plates, and polarization-maintaining fibers to continuously tune wavelengths by controlling the azimuth angle of wave plates, eliminating the need for an expensive birefringence modulator and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-order optical fiber multi-wavelength filter with two or more birefringent elements is used, then the filter's ability to process optical signals efficiently is improved, but the complexity of detecting appropriate combinations of wave plates and birefringent elements increases, making continuous wavelength tuning difficult
Solution Approach 1:
The filter system is divided into multiple independent birefringent elements (first PMF loop, second PMF loop) with distinct functions. Each element contributes to different aspects of wavelength filtering, allowing the complex high-order filter to be constructed from manageable segments that can be individually optimized and adjusted
Solution Approach 2:
Half-wave plates are introduced as dynamic adjustment elements that can continuously change the azimuth angle of polarization. This enables continuous wavelength tuning of the transmission spectrum by dynamically adjusting the orientation of the wave plates, transforming a static complex system into a dynamically adjustable one
2Adaptability or versatility
If traditional birefringence modulators are used for wavelength tuning, then wavelength tuning capability is achieved, but the cost of the system increases significantly
Solution Approach 1:
The patent replaces expensive birefringence modulators with inexpensive half-wave plates and polarization-maintaining fibers. These simpler, cheaper optical components achieve the same wavelength tuning function without requiring costly specialized devices, making the system more economically viable
Solution Approach 2:
Wavelength tuning is achieved by changing the azimuth angle parameter of the half-wave plates rather than using complex birefringence modulators. This parameter-based control approach uses simple rotational adjustment to achieve continuous wavelength tuning, avoiding the need for expensive active modulation devices
3Adaptability or versatility
If the azimuth angle of wave plates is controlled, then continuous wavelength tuning of the transmission spectrum is achieved, but the difficulty of determining the azimuth angle of each individual optical device increases
Solution Approach 1:
The system employs feedback mechanisms where the transmission spectrum characteristics are monitored and used to adjust the azimuth angles of the half-wave plates. This feedback loop enables automatic or semi-automatic determination of the required azimuth angles, reducing the manual calculation and measurement burden
Solution Approach 2:
Standardized azimuth angle configurations are established in advance for the half-wave plates based on the desired wavelength tuning range. These pre-determined angle settings simplify the setup process and reduce the complexity of real-time angle determination during operation
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 solution enables continuous wavelength tuning, expanding the application range and efficiency of high-order optical fiber multi-wavelength filters in fields like microwave and optical signal processing, multi-wavelength laser oscillation, and optical sensor demodulation, while reducing costs by avoiding the use of expensive birefringence modulators.
Implementation Method 1
a polarization beam splitter configured to form a polarization-diversity loop configuration by splitting light received from a broadband light source into two polarization components
Implementation Method 2
a pair of polarization-maintaining fibers configured to form interference spectrums by assigning phase differences through birefringence
Implementation Method 3
pairs of polarization controllers each including at least one wave plate in combination, and configured to change a polarization state of input light
Data Source
AI summary
A high-order optical fiber multi-wavelength filter includes a polarization beam splitter configured to form a polarization-diversity loop configuration by splitting light received from a broadband light source into two polarization components, combining circulated and input light of the two polarization components, and outputting the combined light, a pair of polarization controllers each including at least one wave plate in combination, and configured to change a polarization state of input light, and a pair of polarization-maintaining fibers configured to form interference spectrums by assigning phase differences through birefringence.