Optical Switch Micro Mirror Cross-Talk Correction
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Solution Overview
Problem
Conventional optical switch systems using micro mirrors face challenges in reducing electrical cross-talk between neighboring mirrors, leading to angle shifts and increased insertion loss, which are difficult to correct without increasing mounting area or cost.
Innovation Solution
An optical switch system with a storage unit for connection information, a correction quantity calculator, and a drive output unit that adjusts micro mirror angles to correct for cross-talk, using a cross-talk table and filtering processes to minimize mechanical resonance and optimize control angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If micro mirrors are downsized to reduce mounting area, then compact size is achieved, but electrical cross talk between neighboring mirrors increases causing angle shift
Solution Approach 1:
The system pre-calculates and stores correction quantities for angle shifts caused by electrical cross talk in a lookup table during the design phase. During operation, the control device simply retrieves the appropriate correction value based on the desired mirror angle, eliminating the need for real-time complex calculations or additional sensors.
Solution Approach 2:
The control device adjusts the driving voltage applied to each micro mirror by adding a correction quantity to the theoretical voltage value. This parameter modification compensates for the angle shift caused by electrical cross talk, ensuring the mirror reaches the precise target angle despite the harmful electromagnetic interference from neighboring mirrors.
2Measurement precision
If mirror angle sensor is mounted in each micro mirror to reduce cross talk influence, then control accuracy is improved, but mounting area and cost increase
Solution Approach 1:
The invention extracts the angle measurement function from physical sensors mounted on each mirror and relocates it to a centralized control device. The control device calculates the actual angle by processing the driving voltage information and retrieving correction quantities from stored data, eliminating the need for individual sensors on each micro mirror.
Solution Approach 2:
Instead of using physical sensors to directly measure mirror angles, the system creates a virtual model of the mirror positions through calculation. The control device computes the actual angle by combining the theoretical angle (based on driving voltage) with the pre-stored correction quantity, effectively copying the measurement function into the control algorithm rather than using physical sensing elements.
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 system effectively corrects angle shifts due to cross-talk without increasing mounting area or cost, resulting in a low-loss optical switch system with improved accuracy and reduced insertion loss.
Implementation Method 1
each of the mirrors has a reflection plane whose angle can be controlled. Optical signals entered from a plurality of input ports are reflected by the plurality of micro mirrors
Data Source
AI summary
An optical switch system has a plurality of micro mirrors arranged in a plane, and an angle of each of the micro mirrors can be controlled for reflecting an optical signal entered from one or more input ports so that the reflected optical signal enters a selected output port of one or more output ports. The optical switch system includes a storage portion for storing connection information between the input port and the output port, a correction quantity obtaining portion for obtaining a correction quantity for a cross talk generated between neighboring micro mirrors among the plurality of micro mirrors, a computing portion for determining a controlling quantity of the micro mirror in accordance with the connection information and the correction quantity, and a drive output portion for driving the micro mirror in accordance with the controlling quantity.