Optical Transmission Module Light-Shielding Members Stray Light
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Solution Overview
Problem
In optical transmission modules with multiple light-emitting and light-receiving elements, leakage light from adjacent elements can interfere with precise monitoring, making it difficult to maintain constant light intensity due to densely packed components.
Innovation Solution
The optical transmission module incorporates light-shielding members on the light-receiving elements, avoiding their light-receiving surfaces to prevent stray light interference, and may include a beam splitter to direct light for accurate monitoring, with light-shielding resin used for effective light blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple light-emitting elements and light-receiving elements are densely provided in one package, then the miniaturization of the optical transmission module is achieved, but leakage light or stray light from adjacent light-emitting elements may be incident on light-receiving elements, causing monitoring precision to deteriorate
Solution Approach 1:
A light-shielding member is introduced as an intermediary element between the light-emitting elements and light-receiving elements. This member selectively blocks stray light paths while allowing the intended light signals to pass through to the light-receiving elements, thereby maintaining monitoring precision in a compact configuration
Solution Approach 2:
The light-shielding member is positioned and shaped to provide localized shielding only in specific directions where stray light originates from adjacent elements. The shielding is not complete or omnidirectional, but rather targeted to specific angular regions, allowing the module to maintain compact size while protecting against problematic light paths
2Measurement precision
If light-shielding members are added to prevent stray light interference, then light monitoring precision is improved, but device complexity increases
Solution Approach 1:
The light-shielding member is integrated with the light-receiving element structure rather than being a separate, complex assembly. The shielding function is combined with the mounting substrate or housing, creating a unified component that provides both mechanical support and optical shielding without requiring additional independent structures
Solution Approach 2:
The light-shielding member is implemented using simple, inexpensive materials such as opaque paint, black epoxy resin, or thin metal foils that can be easily applied during the packaging process. These materials provide effective shielding without requiring precision-machined metal components or complex optical elements
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 allows each light-receiving element to accurately monitor light outputs from light-emitting elements, ensuring the intensity of emitted light is maintained consistently, even in the presence of stray light, thereby enhancing the reliability of the optical transmission.
Implementation Method 1
light-shielding members provided on the plurality of light-receiving elements while avoiding the light-receiving surfaces
Implementation Method 2
a beam splitter splitting the light emitted from each of the plurality of light-emitting elements
Data Source
AI summary
An optical transmission module that converts an electric signal to an optical signal and outputs the optical signal, including: a package; a plurality of light-emitting elements each emitting light in the interior of the package; a plurality of light-receiving elements each including a light-receiving surface on which a portion of the light is incident in the interior of the package, for monitoring light outputs of the plurality of light-emitting elements; and light-shielding members provided on the plurality of light-receiving elements while avoiding the light-receiving surfaces.