Dual Light Deflection Elements for Optical Switch Power Stabilization
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Solution Overview
Problem
Optical switches using light deflection devices with electro-optic crystals face challenges in controlling deflection angles with precision over a wide range, leading to power losses and DC drift, which hinders the stabilization of output light power during switching operations.
Innovation Solution
The implementation of a dual light deflection element system, where a first light deflection element provides coarse adjustment and a second light deflection element offers fine adjustment of the deflection angle, utilizing separate drive voltages to maximize output power and mitigate DC drift, with control circuits managing these voltages to optimize switching performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single light deflection element is used to cover a wide deflection angle range, then the switching response speed is improved, but the precision of deflection angle control deteriorates leading to power losses
Solution Approach 1:
The light deflection function is segmented into two independent elements: a first light deflection element for coarse adjustment covering a wide angle range, and a second light deflection element for fine adjustment providing precise control. This segmentation allows each element to optimize for its specific function, resolving the contradiction between wide-range switching speed and precision control.
2Adaptability or versatility
If the drive voltage range is widened to cover all output ports, then the adaptability to different output destinations is improved, but the control precision deteriorates due to voltage errors
Solution Approach 1:
The drive voltage control is segmented into two stages: the first light deflection element handles large voltage changes for coarse positioning across different output ports, while the second light deflection element handles small voltage adjustments for precise angle control. This segmentation resolves the contradiction between wide adaptability and control precision.
Solution Approach 2:
The second light deflection element acts as an intermediary that compensates for the imprecision of the first element. By adding fine adjustment capability after coarse positioning, the system achieves both wide adaptability and high precision control.
3Device complexity
If a single light deflection element is used, then the device complexity is reduced, but the ability to stabilize output power during DC drift deteriorates
Solution Approach 1:
The light deflection system is segmented into two elements with distinct functions: the first element provides the primary deflection and switching response, while the second element specifically compensates for DC drift by providing continuous fine adjustment. This segmentation enables the system to maintain output power stability without significantly increasing overall complexity.
Solution Approach 2:
The second light deflection element effectively implements a feedback mechanism where the fine adjustment continuously compensates for drift in the first element's output, ensuring stable power delivery to the selected output port despite changes in the primary deflection element's characteristics.
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 precise control of deflection angles over a wide range, minimizing power losses and stabilizing output light power even during DC drift occurrences, thereby enhancing the response performance of optical switches.
Implementation Method 1
a light deflection device 101 has a ferroelectric crystal 102 possessing an electro-optic effect... When a drive voltage is supplied to the electrodes 103, light entering one side face 102-3 of the crystal 102 can be deflected by means of the electro-optic effect
Data Source
AI summary
An optical switch which minimizes losses in the power of output light while enabling deflection of light within a range of comparatively large deflection angles used for setting switching among output ports. The optical switch is configured to have a first light deflection element deflecting the input light at an angle appropriate to a position of an designated port with an applied first drive voltage; and a second light deflection element finely adjusting a deflection angle of the light output from the first deflection element to the designated port with an applied second drive voltage such that power of light output from the designated port becomes maximum.