Optical Module Beam Splitter Stray Light Suppression
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Solution Overview
Problem
Existing bidirectional optical modules face difficulties in reliably suppressing stray light and efficiently performing alignment work due to the need for precise positioning of stray light blocking members.
Innovation Solution
The optical module incorporates a beam splitter with a light absorbing/reflecting unit on its fourth surface, which splits incident light into transmitted and reflected components, allowing for effective absorption or reflection of stray light and facilitating efficient alignment by ensuring the light absorbing/reflecting unit can be placed on the fourth surface, thereby addressing stray light suppression and alignment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a stray light blocking member is used to suppress stray light, then stray light suppression is improved, but alignment work becomes difficult and inefficient due to the need for high positioning accuracy
Solution Approach 1:
The harmful function of the fourth surface (which causes stray light) is extracted and addressed by adding a light absorbing/reflecting unit specifically on that surface, separating the stray light problem from the main beam splitter component
Solution Approach 2:
A light absorbing/reflecting unit is introduced as an intermediary element on the fourth surface to handle stray light, mediating between the beam splitter and the surrounding environment to prevent stray light generation
2Object-affected harmful factors
If the light absorbing/reflecting unit is provided on the fourth surface of the beam splitter, then stray light is suppressed and alignment work is facilitated, but the device complexity increases
Solution Approach 1:
The light absorbing/reflecting unit is merged with the fourth surface of the beam splitter, combining multiple functions (beam splitting and stray light management) into a single integrated structure rather than adding separate components
Solution Approach 2:
The fourth surface of the beam splitter is given multiple functions: it serves as both a structural surface of the beam splitter and a substrate for the light absorbing/reflecting unit, enabling the same surface to handle both beam splitting and stray light suppression
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 suppresses stray light and enables efficient alignment work by ensuring the light absorbing/reflecting unit can be placed on the fourth surface of the beam splitter, improving the overall performance of the optical module.
Implementation Method 1
second split light reflected on the inner surface and emitted from the third surface
Implementation Method 2
first split light transmitted through the inner surface and emitted from the second surface
Implementation Method 3
light absorbing/reflecting unit provided on the fourth surface
Data Source
AI summary
An optical module according to one embodiment includes: a beam splitter having a first surface, a second surface facing the first surface, a third surface intersecting with the first surface, a fourth surface facing the third surface, and an inner surface formed within a region defined by the first surface, the second surface, the third surface, and the fourth surface; and a light receiving unit arranged at a position facing the third surface of the beam splitter. The beam splitter splits first incident light incident from the first surface into first split light transmitted through the inner surface and emitted from the second surface and second split light reflected on the inner surface and emitted from the third surface. The optical module includes a light absorbing/reflecting unit provided on the fourth surface.