Optical Transceiver Shielding for EMI Mitigation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Optical transceiver modules face challenges in maintaining optical efficiency and thermal management due to the close proximity of components, which leads to electromagnetic interference (EMI) and potential damage to wire bonds during assembly, affecting manufacturing yield and performance, especially at high data transfer rates.

Innovation Solution

Incorporating shielding members between the transmitter optical subassembly (TOSA) and receiver optical subassembly (ROSA) within a partitioned housing to minimize EMI and protect wire bonds from damage during assembly and operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If TOSA and ROSA are disposed in close proximity within the housing to increase channel density, then device integration is improved, but electromagnetic interference between the subassemblies increases

Engineering Contradiction:

Improvechannel densityVSAvoidelectromagnetic interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

A shielding member is introduced as an intermediary element between the TOSA and ROSA subassemblies. This shield acts as a mediator that blocks electromagnetic fields from one subassembly from interfering with the other, allowing both to operate in close proximity without mutual interference.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The housing is divided into separate compartments or regions, with the shielding member creating distinct electromagnetic zones for the TOSA and ROSA. This segmentation isolates the electromagnetic environments of each subassembly while maintaining physical integration within the same housing.

Inventive Principle:

Principle #1Segmentation

2Volume of moving object

If TOSA and ROSA are disposed in close proximity to reduce module size, then miniaturization is improved, but wire bonds are susceptible to damage during assembly

Engineering Contradiction:

Improvemodule sizeVSAvoidwire bond integrity

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The shielding member is positioned and secured within the housing before the TOSA and ROSA subassemblies are fully assembled. This preliminary placement creates a protective structure in advance that prevents wire bonds from being damaged during subsequent assembly operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The shielding member acts as a protective cushion or barrier that is in place before assembly operations occur. It prevents mechanical damage to wire bonds by providing a protective structure that absorbs or deflects potential impacts during the assembly process.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Object-affected harmful factors

If shielding members are added between TOSA and ROSA to reduce EMI, then electromagnetic interference is reduced, but device complexity increases

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidhousing structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The shielding member is designed to perform multiple functions simultaneously: it provides electromagnetic shielding between subassemblies, serves as a structural support element, and can act as a mounting surface for other components. This multi-functionality reduces the need for additional separate elements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The shielding member is integrated with the housing structure itself rather than being a separate add-on component. The shield is combined with existing housing elements, merging the shielding function into the overall housing design and reducing total component count.

Inventive Principle:

Principle #5Merging (Combining)

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 shielding solution increases manufacturing efficiency by preventing wire bond damage and enhances optical transceiver performance by reducing electromagnetic interference, enabling higher data transfer rates without compromising component integrity.

Implementation Method 1

a first shield coupled to at least one of the first housing portion or the second housing portion to reduce electromagnetic interference between the TOSA arrangement and the ROSA arrangement

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentUS10514515B2Techniques for shielding within an optical transceiver housing to mitigate electromagnetic interference between optical subassemblies disposed within the same

Publication Date: 2019.12.24 APPLIED OPTOELECTRONICS INC(US)

AI summary

An optical transceiver module is disclosed having a housing that includes at least a first housing portion and a second housing portion, each of the first and second housing portions including a base portion having at least one sidewall extending therefrom that defines a compartment. The first housing portion is configured to couple to the second housing portion to form a cavity therebetween. A transmitter optical subassembly (TOSA) arrangement coupled to the base portion of the first housing portion and is electrically coupled to a first flexible printed circuit (FPC). A receiver optical subassembly (ROSA) arrangement is coupled to the base portion of the second housing portion and is electrically coupled to a second FPC. A first shield coupled to at least one of the first housing portion or the second housing portion to reduce electromagnetic interference between the TOSA arrangement and the ROSA arrangement.