Optical Circuit Polarization Rotation Separation Element
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Solution Overview
Problem
Existing optical circuits face challenges in providing polarization-independent output light, as they often require complex configurations involving Faraday rotators, polarization beam splitters, and half-wave plates, which complicate miniaturization and increase size due to the need for multiple optical paths and components.
Innovation Solution
The optical circuit employs a polarization rotation/separation element and attenuation elements to spatially separate and convert input light into a single polarization direction, with phase shifters to match phases, and attenuation elements to adjust optical power, allowing for polarization-independent output without the need for complex additional components like Faraday rotators and polarization beam splitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Faraday rotators, polarization beam splitters, and half-wave plates are used to provide polarization-independent output light, then the polarization independence is achieved, but the device complexity and size increase due to multiple optical paths and components
Solution Approach 1:
The patent combines the polarization rotation function and polarization separation function into a single integrated polarization rotation/separation element. This element directly converts input light with arbitrary polarization states into linearly polarized light with a specific polarization direction, eliminating the need for separate Faraday rotators, polarization beam splitters, and half-wave plates. The merging of functions reduces the number of optical components and simplifies the optical path while maintaining polarization independence.
Solution Approach 2:
The polarization rotation/separation element serves multiple functions simultaneously: it rotates polarization, separates polarization components, and outputs linearly polarized light. This multi-functional element replaces multiple specialized components (Faraday rotator for rotation, polarization beam splitter for separation, half-wave plate for alignment), thereby reducing device complexity while achieving the same polarization-independent output.
2Adaptability or versatility
If Faraday rotators, polarization beam splitters, and half-wave plates are used to provide polarization-independent output light, then the polarization independence is achieved, but the device size increases due to multiple optical paths and components
Solution Approach 1:
The patent merges multiple polarization control functions into a single polarization rotation/separation element, eliminating the need for multiple separate optical components and their associated optical paths. This integration directly reduces the physical volume required for the device while maintaining the capability to handle light with arbitrary polarization states and output linearly polarized light.
3Adaptability or versatility
If multiple optical paths and components are used to provide polarization-independent output light, then the polarization independence is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent integrates polarization rotation and separation functions into a single element, reducing the number of components that need to be manufactured and assembled. This simplification of the component structure and reduction in part count directly improves ease of manufacture while still achieving polarization-independent output light.
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 configuration enables the generation of polarization-independent output light with adjusted optical power, contributing to the miniaturization of optical integrated circuits by simplifying the optical path and reducing component count, while maintaining the required optical power for optical functional elements.
Implementation Method 1
a polarization rotation/separation element that spatially separates and outputs a first component which is a component in a first polarization direction, out of input light; and a second component obtained by converting a component in a second polarization direction orthogonal to the first polarization direction, out of the input light, into a component in the first polarization direction
Data Source
AI summary
An optical circuit includes: a polarization rotation/separation element that spatially separates and outputs a first component which is a component in a first polarization direction, out of input light, and a second component obtained by converting a component in a second polarization direction orthogonal to the first polarization direction, out of the input light, into a component in the first polarization direction; a multiplexer that is disposed on an output side of the polarization rotation/separation element, and multiplexes the first component and the second component; and at least one attenuation element that is disposed on the output side of the polarization rotation/separation element, and attenuates any optical power of one of the first component and the second component, both of the first component and the second component, and multiplexed light multiplexed by the multiplexer.