Polarization Beam Splitter Rotator Structure for TE TM Mode Purification
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Solution Overview
Problem
Optical devices in fiber optic telecommunications often introduce errors due to inefficiencies in splitting and rotating TE and TM polarization modes, leading to suboptimal performance and increased costs.
Innovation Solution
A polarization beam splitter-assisted polarization rotator-polarization beam combiner structure that splits, rotates, and recombines TE and TM modes to separate and purify the primary modes, reducing error components and enhancing homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polarization beam splitter is used to split TE and TM modes, then the polarization modes can be manipulated independently, but error components are introduced due to inefficient splitting
Solution Approach 1:
The patent extracts and removes error components from the optical signal using a second polarization beam splitter. The system separates the desired polarization modes from the error components introduced by the first beam splitter, effectively taking out the harmful elements from the signal path.
Solution Approach 2:
Polarization rotators are introduced as intermediary devices between the beam splitters to rotate the polarization states of error components, enabling their separation from the main signal. This intermediary action facilitates the removal of error components through the second beam splitter.
2Ease of operation
If a polarization rotator is used to rotate polarization modes, then the modes can be redirected, but error components are introduced due to inefficient rotation
Solution Approach 1:
The patent extracts error components generated by the polarization rotator using the second polarization beam splitter. By rotating the error components to different polarization states and separating them, the system removes these harmful elements while preserving the main signal.
Solution Approach 2:
The system implements a feedback mechanism where error components are continuously identified, rotated to appropriate states, and removed. This closed-loop approach ensures that polarization errors are actively managed and eliminated from the signal path.
3Adaptability or versatility
If polarization modes are split and rotated, then independent manipulation is achieved, but the device complexity increases
Solution Approach 1:
The patent segments the optical system into distinct functional modules: a first polarization beam splitter for initial separation, polarization rotators for state modification, and a second polarization beam splitter for error removal. This segmentation allows independent optimization of each component while achieving overall system functionality.
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
The solution effectively purifies the optical signal by separating undesired polarization errors, resulting in a highly purified primary output with only second-order error modes remaining, thereby improving the performance and reducing costs associated with polarization sensitivity.
Implementation Method 1
Light is a vector field that has two primary and orthogonal polarization states or vector directions. Generally, the polarization states are referred to as the S and P polarizations in free space optics, or the TE (Transverse Electric) and TM (Transverse Magnetic) modes of optical waveguides.
Implementation Method 2
An apparatus and method for substantially removing the error components of an optical signal from the primary orthogonal components
Data Source
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AI summary
A polarization beam splitter-polarization rotator-polarization beam combiner optical structure comprising a pair of polarization rotators having a polarization beam splitter associated with the input ends of the two polarization rotators, and a polarization beam combiner associated with output ends of the two polarization rotators, and a method of purifying a light signal comprising TE and TM modes by disassociating the primary TE and TM modes from first order splitter and rotation error components.