Pluggable Optical Module Plastic EMI Shielding
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Solution Overview
Problem
Optical communications modules face challenges in electromagnetic interference (EMI) shielding, particularly at high frequencies, and require costly metal housings and complex latching mechanisms, which increase costs and reduce mounting density.
Innovation Solution
A pluggable optical communications module design using a plastic body with integrated EMI shielding that eliminates the need for metal housings and complex latching mechanisms, employing a plastic EMI shield and electrical interface for 90° turns, reducing costs and increasing mounting density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal housings and complex latching mechanisms are used for EMI shielding, then EMI protection is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the latching mechanism from the housing structure, implementing it as a separate, simplified beam component that deflects to engage with the cage. This separation allows the housing to focus on EMI shielding while the independent beam handles mechanical retention, reducing overall complexity.
Solution Approach 2:
The patent replaces the traditional complex mechanical latching system with a simplified spring-loaded beam mechanism. The beam deflects under insertion force and engages with the cage through simple geometric interaction, eliminating the need for complex mechanical linkages and reducing moving parts.
2Object-affected harmful factors
If metal housings are used for EMI shielding, then EMI protection is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a composite construction where a plastic housing provides the structural framework and is supplemented with EMI shielding materials (such as conductive coatings or metallic meshes) applied to specific surfaces. This composite approach achieves effective EMI protection while significantly reducing material costs compared to solid metal housings.
Solution Approach 2:
Instead of using metal throughout the entire housing, the patent applies EMI shielding properties locally to specific areas where radiation escape is most problematic. This selective application of shielding materials optimizes EMI protection while minimizing material costs and manufacturing complexity.
3Productivity
If module density is increased by using closer spacing, then productivity is improved, but EMI interference between adjacent modules increases
Solution Approach 1:
The patent introduces EMI shielding structures (such as conductive barriers or Faraday cage elements) as intermediary components between adjacent optical modules. These intermediaries block electromagnetic fields from propagating between neighboring modules, enabling closer spacing without compromising signal integrity or increasing 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
The solution effectively limits EMI leakage while reducing module costs and increasing bandwidth by using a plastic body with integrated EMI shielding and simplified latching, enabling efficient high-frequency operation without the need for metal housings or complex latching mechanisms.
Implementation Method 1
an EMI shield (60) secured to a back portion of the module body (10a)
Data Source
AI summary
An optical communications system and a pluggable optical communications module for use in the system are provided. The configuration of the pluggable optical communications module is such that no optical turn in any light path is required. Embodiments of the optical communications module include an EMI shielding solution and an electrical interface for electrically interfacing an electrical subassembly (ESA) of the module with a system printed circuit board (PCB) in a way that obviates the need for an optical turn.