Passive Optical Switching Using MEMS Mirror Harvesting Light Power
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Solution Overview
Problem
Fiber optic networks face disruptions due to physical faults and power losses, which can lead to information transmission failures, and existing solutions lack effective passive and power-independent failover mechanisms.
Innovation Solution
A passive fiber optic switching (PFOS) device using a Micro-Electro-Mechanical System (MEMS) mirror switch that harvests power from light to automatically switch communication paths between redundant fibers, enabling failover without an external power supply, allowing continuous operation and maintenance time for network issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional active optical switching systems are used to detect faults and switch paths, then fault detection and path switching capability is achieved, but external power supply is required which reduces system reliability during power failures
Solution Approach 1:
The optical switching system harvests power from the optical signals passing through the fiber optic cable itself, eliminating the need for external power supplies. The system serves itself by converting a portion of the transmitted optical energy into electrical power to drive the switching mechanism, thereby maintaining reliability even during external power failures.
Solution Approach 2:
The patent replaces traditional mechanically actuated switches with optically-driven MEMS (Micro-Electro-Mechanical Systems) mirrors. These MEMS devices are actuated by electrostatic forces generated from harvested optical power, substituting complex mechanical switching mechanisms with simpler, more reliable optical-field-controlled mirrors that have no moving contacts.
2Extent of automation
If passive optical switching without power harvesting is implemented, then power independence is achieved, but automatic fault detection and switching capability is lost
Solution Approach 1:
The system uses MEMS mirrors that can be precisely controlled by electrostatic actuation fields generated from harvested optical power. This substitution enables automatic switching capability while consuming minimal power, as the MEMS devices require only micro-watt level power for actuation compared to traditional mechanical switches.
Solution Approach 2:
The system changes the operational parameters by using extremely low power levels for MEMS actuation. The electrostatic actuation of MEMS mirrors requires only a few micro-watts of power, which can be easily harvested from the optical signal itself, enabling automatic operation without external power while maintaining low energy consumption.
3Use of energy by stationary object
If optical power is harvested to power the switching mechanism, then power independence is achieved, but available optical power for signal transmission is reduced
Solution Approach 1:
The system extracts only a small fraction of the optical power needed for MEMS actuation (micro-watt level), leaving the vast majority of optical power available for signal transmission. This partial extraction approach ensures that power harvesting does not significantly impact the optical signal budget while still providing sufficient power for automatic switching operations.
Solution Approach 2:
The patent changes the power extraction parameters by using ultra-low power MEMS actuation that requires only micro-watts of optical power. This parameter change enables power harvesting without significantly depleting the optical signal, as the harvested power represents a negligible fraction of the total optical power in the fiber, typically less than 0.1 dB loss.
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 PFOS device ensures high uptime and network resilience by automatically switching to redundant paths, preventing outages and providing maintenance time by using self-sustained power from light, thus improving fiber optic network reliability.
Implementation Method 1
converting the split-off light to power (e.g., electrical current) at the optical sensor
Implementation Method 2
converting the split-off light to power (e.g., electrical current) at the optical sensor
Implementation Method 3
an optical switch, such as a Micro-Electro-Mechanical System (MEMS) mirror switch, that can change the working path by switching light
Data Source
AI summary
A passive fiber optic switching (“PFOS”) device may provide failover in a fiber optic network by switching a working path between different fibers of a redundant set of fibers. The PFOS device may operate passively (e.g., without an active, external, and/or continuous power supply) by harvesting the power that it needs from the light that passes over any one or more fibers that are connected to the PFOS device. The PFOS device may detect issues that disrupt signaling and/or light transmission on the working path based on quality (e.g., signaling and/or light properties) of the working path, and/or diagnostic messaging received from other devices on the working path. The PFOS device may include an optical switch, such as a Micro-Electro-Mechanical System (“MEMS”) mirror switch, that can change the working path by switching light to any fiber of the redundant set of fibers.