Rotatable Beam Splitter for Compact Polarization Control
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Solution Overview
Problem
Conventional polarization control methods in optical fiber networks are cumbersome, costly, and large in size due to the need for multiple paddles or piezoelectric devices, which complicates polarization control and increases the size and expense of polarization diverse detection systems.
Innovation Solution
A rotatable beam splitter is used to control polarization by rotating with respect to the fast and slow axes of the optical fiber, eliminating the need for paddle controllers and piezoelectric devices, and requiring only one degree of freedom for full polarization power balancing, allowing for compact and cost-effective polarization rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional polarization control methods using multiple paddles or piezoelectric devices are used, then polarization control capability is achieved, but device complexity and size increase
Solution Approach 1:
The patent combines polarization control and polarization separation functions into a single rotatable beam splitter component. By rotating the beam splitter about the optical axis, both polarization rotation and polarization diverse detection are achieved simultaneously, eliminating the need for separate paddle controllers and reducing system complexity while maintaining full polarization control capability
Solution Approach 2:
The rotatable beam splitter serves multiple functions: it acts as a polarization controller through rotation, serves as a polarization separator for diverse detection, and enables power balancing between channels. This multi-functionality replaces what previously required multiple specialized components, reducing overall device complexity
2Adaptability or versatility
If conventional polarization control methods are used, then polarization control is achieved, but system size and cost increase
Solution Approach 1:
The patent merges polarization control and separation functions into one compact rotatable beam splitter assembly, eliminating the need for large paddle controllers and multiple discrete components. This integration dramatically reduces the overall system volume while maintaining full polarization control and diverse detection capabilities
Solution Approach 2:
The patent extracts and eliminates unnecessary components such as low bend loss fiber and multiple paddle controllers from the system. By using a standard beam splitter that can be simply rotated, the system removes bulky elements while retaining essential polarization control functionality
3Measurement precision
If conventional polarization diverse detection schemes are used, then polarization response monitoring is achieved, but optical loss increases
Solution Approach 1:
The rotatable beam splitter simultaneously performs polarization control and polarization separation for diverse detection. By integrating both functions in one component, the system eliminates additional optical interfaces and components that would otherwise introduce extra insertion losses, thereby reducing total optical loss while maintaining monitoring precision
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 enables efficient and compact polarization control, reducing optical loss and cost by eliminating the need for low bend loss fiber and minimizing the number of axes of motion, while ensuring balanced optical power between S and P channels in polarization diverse detection schemes.
Implementation Method 1
A rotatable beam splitter is used to control polarization by rotating with respect to the fast and slow axes of the optical fiber
Implementation Method 2
A PBS is composed of a birefringent crystal, where one axis of the crystal has a different index of refraction compared to the other axis of the crystal
Implementation Method 3
Polarization control can be performed by inducing a phase shift between light transmitted along the fast and slow axis in an optical fiber
Data Source
Figure 1~2
Figure 3~6
Figure 5A~5C
AI summary
An apparatus for separating polarization of light includes a rotatable beam splitter including an input for receiving light with a first polarization and an output for outputting light with a second polarization different from the first polarization. Rotation of the rotatable beam splitter changes the first polarization of the input light to the second polarization of the output light. An optical network and method are also set forth.