Fiber Optic Switching Alignment Using Dual Phase Light Modulators
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Solution Overview
Problem
Fiber optic switching devices with phase light modulators face challenges in aligning input and output fibers and modulators, leading to reduced signal strengths and increased bit error rates due to misalignments.
Innovation Solution
A method and device using two phase light modulators with phase elements, where initial and corrected settings are calculated to align optical signals, minimizing displacement from the center of output fibers by estimating and adjusting phase element settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spatial distances between input fibers, output fibers, and PLMs are increased to reduce misalignments, then alignment precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating corrected phase element settings based on estimated position displacements before actual signal transmission. The system estimates misalignment positions and computes compensation values in advance, allowing the optical signal to be properly aligned without requiring precise physical positioning of components.
Solution Approach 2:
The patent changes the phase parameters of the PLM elements dynamically to compensate for spatial misalignments. By adjusting the phase shift values of individual phase elements based on calculated correction values, the system compensates for position displacements without physically moving components, thus maintaining alignment precision while avoiding increased device complexity.
2Reliability
If phase element settings are adjusted to correct signal position displacement, then signal alignment is improved, but processing time and computational complexity increase
Solution Approach 1:
The system performs preliminary estimation of position displacement and pre-calculates corrected phase settings before actual signal routing is needed. This allows the alignment correction to be prepared in advance, minimizing the time required during actual signal transmission while maintaining reliable signal alignment.
Solution Approach 2:
The patent replaces mechanical alignment adjustment with computational phase modulation. Instead of physically adjusting component positions, the system uses digital calculation to determine corrected phase settings, which are then applied electronically to the PLMs. This substitution significantly reduces processing time compared to mechanical adjustment methods.
3Ease of operation
If initial phase element settings are used without correction, then device operation is simplified, but signal strength and alignment precision deteriorate
Solution Approach 1:
The system performs self-alignment by automatically estimating position displacements and calculating corrected phase settings without external intervention. The fiber optic switching device self-corrects for misalignments through computational processing, maintaining ease of operation while improving signal strength and alignment precision through automatic compensation.
Solution Approach 2:
The system implements feedback by using the estimated position displacement information to calculate and apply corrected phase settings. The displacement estimation serves as feedback that drives the correction process, allowing the system to automatically adjust phase elements to compensate for misalignments while maintaining simple 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
The method and device improve signal alignment, reducing misalignments and bit error rates by ensuring the corrected signal image is centered and focused on the intended output fiber, enhancing signal strength and reducing cross-talk.
Implementation Method 1
The first PLM has first phase elements, each of which modifies a phase of the optical signal, and the second PLM has second phase elements with similar functionalities
Data Source
AI summary
An example device includes an input fiber array having input fibers. In operation, the input fiber array receives input light and generates an optical signal based on the input light. The device also includes first and second phase light modulators (PLMs). The first PLM has first phase elements configured to be optically coupled to the input fiber array, and the second PLM has second phase elements configured to be optically coupled to the first PLM. In operation, the first PLM receives the optical signal and directs the optical signal toward the second PLM. The device also includes an output fiber array having output fibers. In operation, the second PLM directs the optical signal toward the output fiber array, and the output fiber array generates a signal image based on the optical signal.