Thermal Isolating Optical Joint for Variable Attenuator Multiplexers
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Solution Overview
Problem
In complex optical networks, thermal conductivity between silicon components and across optical seams in variable optical attenuator multiplexers leads to temperature fluctuations, affecting the optical properties of components, necessitating heat sinking and power management to maintain proper operating temperatures.
Innovation Solution
The integration of thermal isolators, such as gaps and trenches in the optical seams, reduces thermal transmission between silicon components while maintaining optical connectivity, using optical adhesives to form seams that are both optically and thermally conductive but include thermal isolation features like v-shaped gaps and trenches to minimize thermal cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical adhesive is used to form seams between silicon components, then optical connectivity is achieved, but thermal conductivity causes temperature fluctuations and thermal cross-talk
Solution Approach 1:
The optical seam is segmented into two distinct regions: a first portion with high optical transmission for maintaining optical connectivity, and a second portion with reduced thermal conductivity for minimizing thermal cross-talk. This segmentation allows the seam to simultaneously achieve both optical performance and thermal isolation between adjacent optical components.
Solution Approach 2:
Different portions of the optical seam are assigned different functional qualities: the first portion is optimized for optical transmission while the second portion is optimized for thermal isolation. This local differentiation of properties enables the single seam structure to fulfill dual functions of optical coupling and thermal management.
2Temperature
If heat sinking is added to maintain operating temperatures, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The thermal management function is extracted from the bulk material properties and concentrated into the interface region at the optical seam. By modifying only the seam structure to provide thermal isolation, the patent eliminates the need for additional heat sinking structures while maintaining temperature stability across the device.
Solution Approach 2:
The optical seam itself acts as an intermediary element that performs dual functions: transmitting optical signals while simultaneously providing thermal isolation. This intermediary structure at the interface between components replaces the need for separate thermal management components.
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 effectively maintains a consistent operating temperature across the optical components, reducing the need for extensive heat sinking and power management, thereby enhancing the stability and efficiency of the variable optical attenuator multiplexer.
Implementation Method 1
optical adhesive to form an optical seam
Implementation Method 2
silicon is a relatively good thermal conductor, thermal conductivity between chips and across the optical seam
Implementation Method 3
thermal isolating optical joint reduces thermal transmission across optical joints
Data Source
AI summary
A variable optical attenuator multiplexer having at least one thermal isolating optical joint. The variable optical attenuator multiplexer including a plurality of planar lightwave circuit components, such as, for example a combination of an array waveguide grating, a variable optical attenuator, and/or a power monitor. The planar lightwave circuit components are joined with an optical adhesive. The components may be thermally isolated by the formation of a widened space or gap between the component joints, and/or by creating a trench in the optical adhesive.