MEMS VOA Optical Switch Assembly for OPM Reliability
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Solution Overview
Problem
Conventional mechanical switches in optical performance monitor (OPM) assemblies for fiber optic networks have a short service life due to high fatigue stresses, necessitating frequent replacements.
Innovation Solution
An N×1 optical switch assembly using micro-electro-mechanical system (MEMS) variable optical attenuators (VOAs) that are optically coupled to input ports and a combiner, allowing for reliable operation with reduced actuation displacement and fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical switches are used in OPM assemblies, then the device can be manufactured with simpler technology, but the service life is limited due to high fatigue stresses from continuous cycling
Solution Approach 1:
The patent replaces conventional mechanical switches with MEMS-based optical switching elements. The MEMS device uses electrostatic actuation to deflect a mirror, routing optical signals without mechanical contact wear. This substitution of mechanical switching with electrostatically-controlled optical switching eliminates the fatigue stress problem while maintaining the switching function, thereby extending service life from millions of cycles to potentially billions of cycles.
Solution Approach 2:
The patent changes the operating parameters of the switching mechanism by using electrostatic fields instead of mechanical contact. The MEMS mirror is actuated by applying voltage to create electrostatic force, which deflects the mirror to redirect light. This parameter change from mechanical force to electrostatic force fundamentally alters the wear characteristics and extends the device service life.
2Productivity
If mechanical switches cycle continuously to monitor multiple optical lines, then real-time monitoring capability is achieved, but fatigue stress increases reducing service life
Solution Approach 1:
The patent replaces the mechanically-cycling switch with a MEMS-based optical switch that uses electrostatic actuation. The MEMS mirror can be rapidly deflected between positions to route signals from different optical input ports to the OPM. This electrostatic actuation mechanism maintains the real-time monitoring capability while eliminating mechanical contact fatigue, allowing for extended service life even with continuous cycling required for monitoring multiple optical lines.
3Reliability
If frequent replacement of mechanical switches is performed to maintain reliability, then system reliability is maintained, but maintenance time and operational disruption increase
Solution Approach 1:
The patent replaces mechanical switches with MEMS-based optical switching elements that have significantly extended service lives. The MEMS device uses electrostatic actuation without mechanical contact, eliminating the wear mechanism that limits conventional switch life. This substitution reduces maintenance frequency from potentially yearly replacements to much longer intervals, thereby reducing maintenance time and operational disruption while maintaining high reliability.
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 MEMS VOA switch assembly significantly extends the service life of the switch assembly by minimizing fatigue stresses, enabling more reliable real-time monitoring and management of fiber optic networks.
Implementation Method 1
N micro-electro-mechanical system (MEMS) variable optical attenuators (VOAs), where each MEMS VOA is optically coupled to a respective optical input port
Data Source
AI summary
The present invention provides a switch assembly for use with a single-port OPM to realize a multi-port OPM having improved reliability. In one embodiment, an N×1 optical switch assembly, wherein N is an integer greater than one, is provided. The optical switch assembly includes N optical input ports, N micro-electro-mechanical system (MEMS) variable optical attenuators (VOAs), where each MEMS VOA is optically coupled to a respective optical input port and is operable between an on position and an off position, and an N×1 optical combiner optically coupled to the N MEMS VOAs. Each MEMS VOA is configured to transmit an optical signal from a respective one of the optical input ports to the N×1 optical combiner in the on position and to not transmit the optical signal in the off position.