Piezoelectric Mirrors on Organic Substrates for Optical Routing
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Solution Overview
Problem
Current fiber optic communication networks face bottlenecks due to the need for optical-electrical-optical (OEO) conversion at each router, which is power intensive and costly, and silicon-based MEMS devices are expensive and limited in scalability due to high-temperature processing requirements.
Innovation Solution
Piezoelectrically actuated mirrors are fabricated on organic substrates, allowing for cost-effective and scalable optical routing by using lower-temperature processing and integrating large arrays of steerable mirrors directly into the substrate, eliminating the need for additional assembly and packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon-based MEMS devices are used for optical routing, then optical switching capability is achieved, but manufacturing cost and device complexity increase due to expensive silicon substrates and high-temperature processing
Solution Approach 1:
The patent changes the temperature parameter from high-temperature (silicon-based) processing to low-temperature (organic substrate) processing. This allows the use of cheaper organic substrates instead of expensive silicon substrates while maintaining the optical switching capability through piezoelectric actuation at lower temperatures.
Solution Approach 2:
The patent replaces expensive silicon substrates with cheaper organic substrates. The organic substrates, being less costly and suitable for low-temperature processing, enable more economical manufacturing of optical routing devices while achieving the same functional performance.
2Reliability
If silicon-based MEMS devices are used for optical routing, then optical switching is enabled, but scalability is limited due to wafer size constraints
Solution Approach 1:
The patent transitions from wafer-level fabrication (two-dimensional scaling limited by wafer size) to substrate-level integration. By using organic substrates that can be manufactured in larger formats, the device can scale beyond the constraints of traditional silicon wafer dimensions, enabling integration of larger arrays of mirrors.
Solution Approach 2:
The organic substrate serves multiple functions: it provides the mechanical support structure, enables low-temperature piezoelectric processing, and allows for large-scale integration. This multi-functional approach eliminates the need for separate packaging and assembly steps required by silicon-based devices.
3Reliability
If piezoelectric layers are annealed at high temperatures to crystalize them, then piezoelectric properties are achieved, but organic substrates are damaged or melted
Solution Approach 1:
The patent replaces thermal annealing (heat-based crystallization) with alternative methods such as solvent annealing or vapor-phase crystallization. These methods enable the piezoelectric layer to achieve proper crystalline structure and piezoelectric properties without subjecting the organic substrate to damaging high temperatures.
Solution Approach 2:
The patent changes the crystallization method from thermal (high-temperature) to non-thermal or low-temperature processes. By using solvent annealing or other low-energy crystallization techniques, the piezoelectric layer can be properly formed while keeping the substrate temperature within safe limits for organic materials.
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 reduces manufacturing costs, increases switching capacity, and eliminates the OEO conversion bottleneck by enabling efficient optical routing with smaller, more cost-effective optical routers that can integrate a large number of mirrors on a single organic substrate.
Implementation Method 1
Piezoelectrically actuated mirrors are fabricated on organic substrates
Data Source
AI summary
Embodiments of the invention include an optical routing device that includes an organic substrate. According to an embodiment, an array of cavities are formed into the organic substrate and an array of piezoelectrically actuated mirrors may be anchored to the organic substrate with each piezoelectrically actuated mirror extending over a cavity. In order to properly rout incoming optical signals, the optical routing device may also include a routing die mounted on the organic substrate. The routing die may be electrically coupled to each of the piezoelectrically actuated mirrors and is able to generated a voltage across the first and second electrodes of each piezoelectrically actuated mirror. Additionally, a photodetector may be electrically coupled to the routing die. According to an embodiment, an array of fiber optic cables may be optically coupled with one of the piezoelectrically actuated mirrors and optically coupled with the photodetector.