Optical Module Latch for Signal Ground Isolation
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Solution Overview
Problem
In optical communication systems, the signal ground of optical modules needs to be isolated from the chassis ground to prevent electro-magnetic interference (EMI) noise penetration, but existing mechanisms fail to effectively achieve this isolation due to the grounding of the cover and bush components.
Innovation Solution
An optical module design that incorporates an electrically insulating latch made of resin, which hooks between the metal bush and sleeve cover, ensuring electrical isolation between the signal ground and the chassis ground, thereby preventing EMI noise penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover and bush are both grounded to achieve stable grounding, then grounding reliability is improved, but electrical isolation between signal ground and chassis ground deteriorates
Solution Approach 1:
The latch acts as an intermediary component between the cover and bush, providing mechanical connection while maintaining electrical isolation through its insulating material composition, thus enabling both grounding stability and electrical isolation
2Object-affected harmful factors
If an insulating mechanism is introduced to isolate the cover from the bush, then electrical isolation is improved, but device complexity increases
Solution Approach 1:
The latch serves multiple functions simultaneously: it provides mechanical connection between cover and bush, maintains electrical isolation through insulating material, and ensures stable grounding of the bush to signal ground, thereby simplifying the overall structure while achieving isolation
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 design effectively isolates the signal ground from the chassis ground, preventing EMI noise from entering the optical module and ensuring reliable operation in electromagnetic interference-prone environments.
Implementation Method 1
a latch, which is made of electrically insulating material, typically resin, is put between the metal sleeve cover and the metal bush
Data Source
AI summary
An optical module with an improved coupling portion to couple an optical device with an external fiber is disclosed. The coupling portion includes a stub to secure a coupling fiber in a center thereof, a bush to support the stub, a sleeve to receive the stub in a portion thereof and an external ferrule in another portion, and a sleeve cover to cover the sleeve. The coupling portion further includes a latch put between the bush and the cover by being hooked with both the bush and the cover. The latch electrically isolates the bush from the cover even when the bush and the sleeve cover are made of metal.