Fiber-to-Chip Alignment via Lid Groove and Substrate Rib Engagement

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Solution Overview

Problem

Existing methods for optical coupling between optical fibers and semiconductor chips require complex and expensive interlocking features, leading to increased manufacturing costs and complexity.

Innovation Solution

A passive alignment technique using a lid member with grooves and a substrate with ribs, where the grooves on the lid member engage with the ribs on the substrate to align optical fibers with waveguides, allowing for precise optical alignment without the need for precise machining or expensive parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If precisely-machined interlocking features are used for optical coupling, then alignment precision is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:
Improvealignment precisionVSAvoiddevice complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The lid member is divided into multiple grooves that each receive individual optical fibers, while the substrate is divided into multiple ribs that engage with corresponding grooves. This segmentation allows each fiber to be independently positioned and aligned, achieving precise optical coupling without requiring complex interlocking features across the entire assembly.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The grooves in the lid member and ribs on the substrate serve as intermediary alignment features. These simple geometric forms mediate the alignment between optical fibers and waveguides, replacing the need for complex precisely-machined interlocking features while maintaining alignment precision.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Manufacturing precision

If precisely-machined interlocking features are used for optical coupling, then alignment precision is improved, but manufacturing cost increases

Engineering Contradiction:
Improvealignment precisionVSAvoidmanufacturing cost
Core Design Contradiction:
Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The alignment function is segmented into simple grooves and ribs that can be manufactured using standard processes. Each groove-rib pair independently handles alignment for its corresponding fiber-waveguide connection, enabling cost-effective manufacturing while maintaining precision.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The grooves and ribs are simple geometric features that can be manufactured at low cost using standard fabrication processes. These simple alignment features replace expensive precisely-machined interlocking components, significantly reducing manufacturing cost while maintaining alignment precision.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

3Stability of the object's composition

If complex interlocking features are used, then alignment stability is improved, but ease of manufacture deteriorates

Engineering Contradiction:
Improvealignment stabilityVSAvoidease of manufacture
Core Design Contradiction:
Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The alignment system is segmented into multiple independent groove-rib pairs, each providing stable alignment for its corresponding fiber. This segmentation achieves overall alignment stability through the collective effect of multiple simple features rather than relying on complex interlocking mechanisms.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The grooves and ribs act as intermediary features that provide stable alignment through simple geometric engagement. This intermediary approach achieves alignment stability without requiring complex interlocking features, greatly simplifying the manufacturing process.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS10656339B2Fiber to chip alignment using passive vgroove structures
Publication Date: 2020.05.19 CISCO TECHNOLOGY INC
  • US10656339B2 patent drawing
  • US10656339B2 patent drawing
  • US10656339B2 patent drawing

AI summary

An apparatus comprises a plurality of optical fibers and a lid member having one or more surfaces with grooves formed therein. The lid member defines a first plurality of grooves that are each dimensioned to partly receive an optical fiber of the plurality of optical fibers. The apparatus further comprises a substrate comprising a plurality of waveguides arranged at a predefined depth relative to a reference surface of the substrate, and a plurality of ribs extending from the reference surface. Each rib of the plurality of ribs is dimensioned to engage with a respective groove of a second plurality of grooves of the lid member. Engaging the plurality of ribs of the substrate with the second plurality of grooves of the lid member provides an optical alignment of the plurality of optical fibers with the plurality of waveguides.