Light Emission Module Compact Layout via Mirror Reflection
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Solution Overview
Problem
Conventional light emission modules in high-speed optical transmission systems have an increased size due to the large width caused by the placement of a monitor photodiode behind the laser diode and the laser diode driver, which results in an excessive distance between the two components, affecting signal transmission quality.
Innovation Solution
A light emission module design that includes a base with a laser diode driver, a laser diode, a monitor photodiode, and a reflecting mirror, where the monitor photodiode and laser diode are positioned near the front end of the laser diode driver, and the reflecting mirror is placed between the rear side of the laser diode and the monitor photodiode to reflect light emitted from the rear side of the laser diode to the monitor photodiode, minimizing the distance between the laser diode and the laser diode driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the monitor photodiode is disposed right behind the rear side of the laser diode, then the monitor photodiode can detect the light leaked from the rear side of the laser diode, but the width of the light emission module is overly large which increases the size of the light transceiver
Solution Approach 1:
The monitor photodiode is positioned at the front end of the laser diode driver rather than behind the laser diode, changing the spatial dimension of detection. The reflecting mirror redirects light from the rear side of the laser diode to the front-positioned monitor photodiode, achieving monitoring function while reducing module width
Solution Approach 2:
A reflecting mirror is introduced as an intermediary component to redirect the light path. The mirror reflects light emitted from the rear side of the laser diode to the light receiving surface of the monitor photodiode, enabling the monitor photodiode to be positioned at the front end of the driver instead of behind the laser diode
2Reliability
If the laser diode driver is disposed at a lateral side of the laser diode to minimize the distance between them, then the signal transmission quality is improved, but the width of the light emission module is overly large
Solution Approach 1:
The monitor photodiode and laser diode are positioned at the front end of the laser diode driver, changing the spatial arrangement from a behind-positioning to a front-positioning configuration. This allows the driver to be placed laterally close to the laser diode without increasing overall module width
3Object-affected harmful factors
If the light receiving surface of the monitor photodiode is tilted relative to the emission axis of the laser diode, then light reflection back to the laser diode is prevented, but the complexity of the arrangement is increased
Solution Approach 1:
The reflecting mirror serves as an intermediary that handles the light redirection function. The mirror can be tilted at an angle of 20-60 degrees to prevent light reflection back to the laser diode, while the monitor photodiode itself maintains a simpler front-facing position at the front end of the driver
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 the size of the light emission module by minimizing the width of the base and shortening the distance between the laser diode and the laser diode driver, while maintaining the functionality of the monitor photodiode to monitor the laser diode operation, thereby improving signal transmission quality.
Implementation Method 1
The reflecting mirror is disposed between the rear side of the laser diode and the monitor photodiode for reflecting a light emitted from the rear side of the laser diode to a light receiving surface of the monitor photodiode
Data Source
AI summary
A light emission module includes a base, a laser diode driver, a laser diode, a monitor photodiode and a reflecting mirror. The laser diode driver, the laser diode and the monitor photodiode are disposed on the base. The monitor photodiode and the laser diode are located close to a front end of the laser diode driver. A rear side of the laser diode faces the laser diode driver. The reflecting mirror is disposed between the rear side of the laser diode and the monitor photodiode for reflecting a light emitted from the rear side of the laser diode to a light receiving surface of the monitor photodiode.