Optical Receptacle Ceramic Sleeve Press-Fit Design
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Solution Overview
Problem
Conventional metal optical receptacles suffer from EMI noise issues due to their conductive nature, which degrades signal quality in high-speed optical communication systems, and the press-fitting process for ceramic sleeves is prone to cracking under precise dimension control requirements.
Innovation Solution
The optical receptacle design features a sleeve with separate press-fitting portions along the optical axis, where the insulating sleeve is press-fitted into a metal housing and a metal stopper is press-fitted into a non-overlapping portion of the sleeve, preventing axial overlap and potential cracking, while maintaining electrical isolation through the use of insulating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic sleeve is press-fitted into a metal holder and a metal stopper is press-fitted into the same portion of the sleeve, then the electrical isolation and structural assembly are achieved, but the ceramic sleeve is prone to cracking due to overlapping press-fitting stresses
Solution Approach 1:
The ceramic sleeve is divided into two distinct portions along its axial direction: a first portion for press-fitting into the metal holder and a second portion for press-fitting the metal stopper. These portions are arranged non-overlappingly, so that the press-fitting operations occur at different locations along the sleeve's axis, preventing stress concentration and cracking at any single point.
2Strength
If a metal receptacle is used for optical coupling, then the structural strength and assembly are achieved, but EMI noise is generated and signal quality is degraded
Solution Approach 1:
The harmful conductive property is extracted from the critical optical coupling region by introducing a ceramic sleeve between the metal holder and the optical components. The ceramic material provides electrical insulation, isolating the optical path from EMI noise generated by the metal receptacle and driving signals, while the overall structural strength is maintained through the metal holder and stopper components.
Solution Approach 2:
The receptacle structure employs a composite design combining metal components (holder and stopper) for structural strength with a ceramic sleeve for electrical insulation. This composite construction allows the metal parts to provide mechanical support while the ceramic portion prevents EMI noise transmission, achieving both strength and noise reduction requirements.
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
This configuration effectively reduces the risk of cracking in brittle ceramic sleeves during press-fitting and provides electrical isolation between the package and the metal housing, mitigating EMI noise interference and enhancing signal quality in optical communication modules.
Implementation Method 1
the sleeve made of insulating material and the metal holder 43 is physically separated from the metal flange 44, the ferrule 47 may be electrically isolated from the package of the optical module
Implementation Method 2
The rigid sleeve 42, made of ceramics, is press-fitted into the metal holder 43, while, the sleeve 42 receives in a rear portion thereof the metal stopper 45 by press-fitting
Implementation Method 3
the inside member is shrunk as well as the outside member is expanded by the press-fitting
Data Source
AI summary
An optical receptacle for an optical subassembly is disclosed. The receptacle includes a sleeve made of brittle insulating material, for instance, a ceramics to electrically isolate the housing of the receptacle from the package for a semiconductor device. The receptacle disclosed has an arrangement that prevents the sleeve, even made of brittle material, from cracking. A portion of the sleeve is press-fitted into the housing, while, the metal stopper is press-fitted into another portion of the sleeve, which is apart from the former portion. Accordingly, the sleeve may be escaped from receiving the pressure from both the inside and the outside at the same time, which prevents the sleeve from cracking.