MEMS Mirror Drift Compensation in Optical Circuit Switches
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Solution Overview
Problem
Optical circuit switches using MEMS mirror arrays face challenges with mirror element drift due to mechanical stress relief and trapped charge, leading to performance degradation and interference with new connections, especially when residual drift is not compensated.
Innovation Solution
The implementation of a position optimizer and drift compensator within the optical circuit switch controller, which periodically adjusts mirror element positions and accounts for residual drift by maintaining a drift history table to provide compensated voltages, ensuring accurate connection establishment and minimizing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mirror element positions are adjusted to compensate for drift, then connection reliability is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The drift compensator proactively adjusts mirror element positions by predicting drift based on historical data stored in the drift history table, rather than waiting for connection failures to occur. This preliminary compensation maintains connection reliability while using a relatively simple controller architecture.
Solution Approach 2:
The system uses its own operational history (drift history table) to compensate for its own drift issues. The drift compensator analyzes past drift patterns and automatically adjusts mirror positions without requiring external intervention or complex external control systems.
2Loss of time
If drift compensation is implemented for all mirror elements, then connection establishment time is reduced, but energy consumption increases due to frequent adjustments
Solution Approach 1:
The drift compensator applies compensation selectively rather than continuously to all mirror elements. It uses the drift history table to identify which mirror elements require adjustment and applies corrections only when and where needed, reducing unnecessary energy consumption while still maintaining fast connection establishment.
3Manufacturing precision
If residual drift is compensated using historical data, then manufacturing precision requirements are relaxed, but measurement precision requirements increase
Solution Approach 1:
The system implements a feedback mechanism where the drift history table stores information about actual drift occurrences. The drift compensator continuously monitors mirror element positions, compares them against historical data, and makes adjustments based on measured drift patterns. This feedback loop allows the system to compensate for manufacturing variations through precise measurement and correction of actual drift.
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 solution effectively compensates for mirror element drift, maintaining connection reliability and reducing the time required to establish new connections by accounting for both accumulated and residual drift, thereby enhancing the overall performance and stability of the optical circuit switch.
Implementation Method 1
A typical optical circuit switch may have a plurality of ports and be capable of selectively connecting any port to any other port in pairs
Implementation Method 2
mirror element drift due to mechanical stress relief and trapped charge
Implementation Method 3
mirror element drift due to mechanical stress relief and trapped charge
Data Source
AI summary
Methods of operating an optical circuit switch and optical circuit switches are disclosed. To make a connection between a first port and a second port, baseline voltages may be determined, baseline voltages being voltages that, if respectively applied to one or more electrode coupled to a first mirror element uniquely associated with the first port and one or more electrode coupled to a second mirror element uniquely associated with the second port, cause the first and second mirror elements to rotate to make the connection in the absence of accumulated mirror element drift. Accumulated drift data associated with one or both of the first mirror element and the second mirror element may be retrieved from a memory. One or more of the baseline voltages may be modified based on the accumulated drift data to provide corrected voltages, and the corrected voltages may be applied to the electrodes.