Planar Lightwave Circuit Coupling Tube Adhesive Placement
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Solution Overview
Problem
Existing optical communication systems face challenges in efficiently and easily connecting and disconnecting optical fibers to planar lightwave circuits (PLCs) without degrading light transmission, as conventional connectors often require complex alignment and adhesives that can interfere with signal passage.
Innovation Solution
A planar lightwave circuit (PLC) with a directly attached coupling tube, where the adhesive is strategically applied to avoid the optical aperture's cross-section, allowing for maximum light transmission and easy attachment/detachment of optical fibers, and a method to position and fix the tube based on optimal light transfer measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive is used to fix the coupling tube to the PLC surface, then the connection stability is improved, but the light transmission through the optical aperture is degraded
Solution Approach 1:
The adhesive is applied selectively to specific regions of the PLC surface where mechanical bonding is needed, while deliberately excluding the optical aperture region. This local differentiation allows the adhesive to provide connection stability without interfering with light transmission through the aperture.
Solution Approach 2:
The coupling tube fixation system is segmented into two functional zones: an adhesive-bonded region for mechanical stability and a non-adhesive optical aperture region for light transmission. This segmentation allows each zone to optimize its specific function without compromise.
2Reliability
If conventional connectors are used to couple optical fibers to PLCs, then the connection reliability is improved, but the ease of connection and disconnection is worsened
Solution Approach 1:
The coupling tube is merged directly with the PLC surface through selective adhesive bonding, creating an integrated assembly that eliminates the need for separate connector components. This merging simplifies the overall structure and enables easier connection and disconnection while maintaining reliability.
Solution Approach 2:
The complex alignment and coupling mechanisms of conventional connectors are extracted and replaced with a simplified direct-attachment system. The coupling tube is positioned and fixed directly to the PLC surface, removing unnecessary intermediate components and steps.
3Ease of manufacture
If adhesive is applied to the entire PLC surface including the optical aperture region, then the manufacturing simplicity is improved, but the light transmission quality is worsened
Solution Approach 1:
The adhesive application process incorporates local quality control by applying adhesive only to non-optical regions of the PLC surface. This selective application maintains manufacturing simplicity while ensuring optimal light transmission quality through the aperture region.
Solution Approach 2:
The coupling tube acts as an intermediary structure that bridges the adhesive-bonded regions and the optical aperture. It provides mechanical support and alignment while allowing light to pass through the aperture without adhesive interference.
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
Enables efficient and easy connection/disconnection of optical fibers to PLCs while maintaining high light transmission, ensuring the adhesive does not interfere with signal passage and allowing for precise alignment for optimal performance.
Implementation Method 1
The adhesive is substantially absent from a region of the PLC surface which is within a cross section of the coupling tube lumen
Data Source
AI summary
A planar lightwave circuit (PLC) is disclosed having fixed thereto a coupling tube for coupling an optical fiber. The PLC comprises a planar optical substrate having in it an optical waveguide having an optical aperture located on an edge surface of the optical substrate and a tube formed having a lumen dimensioned to receive an optical fiber ferrule and an edge surface fixed to the substrate edge surface so that a cross section of the lumen at the edge surface is aligned with the optical aperture.