Telescopic Core Cylinder Module for Optical Signal Isolation
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Solution Overview
Problem
Bi-directional Optical Sub-Assemblies (BOSA) face issues with surface reflections that increase noise and operational failures due to emitted light being reflected back into the housing, leading to decreased stability and lifespan of laser sources, and additional components like isolators and filters increase complexity and cost.
Innovation Solution
The optical sub-assembly incorporates a telescopic-shaped core cylinder module with tapered diameter core portions and a gel coating layer, which isolates optical signals by shrinking the area for reflected light to impinge on the light emitting device and absorbs reflected wavelengths, along with a wavelength filter and blocking filter to separate and block light paths effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional filters or isolators are added to block reflected light, then noise reduction and reliability improve, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple functions (filtering, isolation, light blocking) into a single integrated optical sub-assembly structure. The housing itself is designed to incorporate filtering features and light-blocking surfaces, eliminating the need for separate isolators and additional filters, thus reducing component count while maintaining reliability
Solution Approach 2:
The housing structure serves multiple functions simultaneously: it provides mechanical support, acts as a filter for reflected light, and incorporates light-blocking surfaces. This multi-functionality reduces the need for additional dedicated components, simplifying the overall device while improving operational stability
2Object-affected harmful factors
If additional filters are added to block reflected light, then noise reduction improves, but manufacturing complexity and cost increase
Solution Approach 1:
The filtering function is merged into the housing structure itself rather than being a separate component. The housing incorporates filtering features and light-blocking surfaces as integral parts of its design, simplifying manufacturing by reducing the number of assembly steps and components while effectively blocking reflected light noise
3Stability of the object's composition
If isolators are added to prevent reflected light, then laser source stability improves, but device complexity and size increase
Solution Approach 1:
The isolation function is merged into the housing structure through strategically designed light-blocking surfaces and filtering features. This integration eliminates the need for separate isolator components while maintaining laser source stability, thereby reducing structural complexity
4Duration of action of stationary object
If isolators are added to block reflected light, then operational lifespan of laser source improves, but device complexity and cost increase
Solution Approach 1:
The light-blocking and filtering functions are merged into the housing structure, providing protection for the laser source against reflected light without requiring additional isolator components. This integration extends laser source lifespan while keeping component count low
Solution Approach 2:
The housing serves as a multi-functional component that provides mechanical support, filters reflected light, and protects the laser source. This universality extends component lifespan while avoiding the need for additional protective components
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 reduces noise and operational failures by minimizing reflected light, maintaining reliability and stability without the need for additional components like isolators, thus reducing complexity and cost while ensuring focused light emission onto the optical fibre.
Implementation Method 1
a gel coating layer over an inner surface of the telescopic-shaped core cylinder module... absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions
Implementation Method 2
tapered diameter core portions... taperedly shrinking the area for reflected light to impinge on the light emitting device
Implementation Method 3
a wavelength filter, passing light at one wavelength while reflecting light at another wavelength
Data Source
AI summary
An optical sub-assembly comprising a filtering optical module, a light emitting module having a light emitting device (LED), at least a light receiving module, at least one wavelength filter, a fibre optic connector and cable having a fiber optic, and a telescopic-shaped core cylinder module having at least two tapered diameter core portions and at least a gel coating layer over an inner surface thereof is provided. A first optical signal of the light emitting device is directed to the tapered diameter core portions, the at least one wavelength filter, and onto the fibre optic. The telescopic-shaped core cylinder module is configured to perform isolation on optical signals via the tapered diameter core portions, taperedly shrinking the area for reflected light to impinge on the LED, and the at least a gel coating layer absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions.