Light-Receiving Module Lens Separation for Heat Management
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Solution Overview
Problem
Conventional light-receiving modules fail due to heat generation when strong light is input, causing excessive photocurrent.
Innovation Solution
A light-receiving module design where the optical fiber stub is held separated from the lens with curved surfaces on both sides, allowing light to be condensed and spread within the lens, shifting the focal position and reducing current density when strong light is input, preventing device failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the optical fiber stub is held in contact with the lens, then light transmission efficiency is improved, but heat generation causes the light-receiving device to fail when strong light is input
Solution Approach 1:
The patent introduces an intermediary structure (receptacle holder with separation mechanism) between the optical fiber stub and the lens. This intermediary maintains a controlled separation that prevents direct contact while still allowing effective light transmission, thereby avoiding heat generation issues without compromising optical efficiency
Solution Approach 2:
The patent transitions from a contact-based arrangement to a separated arrangement by utilizing the spatial dimension. By positioning the optical fiber stub at a distance from the lens along the optical axis, the design creates a gap that prevents heat transfer while maintaining optical functionality through proper optical path design
2Reliability
If the optical fiber stub is separated from the lens, then heat generation is prevented, but light transmission efficiency may deteriorate
Solution Approach 1:
The patent employs curved surfaces on both the incident and emission sides of the lens. These curved surfaces are designed to focus light onto the light-receiving device while accommodating the separation between the optical fiber stub and the lens. The curvature enables the lens to converge light rays effectively even when the light source is separated, maintaining transmission efficiency without contact
Solution Approach 2:
The patent optimizes parameters such as the separation distance between the optical fiber stub and lens, the curvature radii of the lens surfaces, and the focal length to achieve the desired balance. By carefully adjusting these parameters, the system maintains effective light transmission while preventing heat generation through separation
3Power
If strong light is input to the light-receiving device, then signal strength is improved, but excessive photocurrent and heat generation cause device failure
Solution Approach 1:
The patent converts the harmful effect of heat generation into a beneficial self-regulating mechanism. When strong light is input, the heat generated at the condensation point inside the lens causes the refractive index to vary, which automatically shifts the focal position and spreads the beam. This prevents excessive photocurrent and protects the device, turning the harmful heat into a protective feedback mechanism
Solution Approach 2:
The patent exploits the temperature-dependent refractive index change of the lens material. As heat generates at the condensation point during strong light input, the refractive index parameter changes dynamically, causing the focal position to shift and the beam to spread. This parameter change provides automatic protection against device failure while maintaining normal operation under moderate light conditions
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
The module effectively prevents failure of the light-receiving device by spreading the light beam and decreasing current density when strong light is input, utilizing a lens with refractive index variation to manage heat and maintain functionality.
Implementation Method 1
a lens including an incident-side curved surface, an emission-side curved surface, and a barrel provided between the incident-side curved surface and the emission-side curved surface; and a receptacle holder holding the receptacle so that the lens and the optical fiber stub are not in contact but separated from each other
Implementation Method 2
When light out from the optical fiber stub enters the lens through the incident-side curved surface, the light is condensed inside the lens and then spreads again, and the light out from the emission-side curved surface is condensed onto a light-receiving surface of the light-receiving device
Implementation Method 3
when strong light is input, the vicinity of a condensation point inside the lens is heated and the refractive index varies, which shifts the focal position of light emitted from the lens
Implementation Method 4
a light-receiving device; a receptacle including an optical fiber stub
Data Source
AI summary
A receptacle (6) includes an optical fiber stub (7). A lens (5) includes an incident-side curved surface (9), an emission-side curved surface (10), and a barrel (11) provided between the incident-side curved surface (9) and the emission-side curved surface (10). A receptacle holder (8) holds the receptacle (6) so that the lens (5) and the optical fiber stub (7) are not in contact but separated from each other. When light out from the optical fiber stub (7) enters the lens (5) through the incident-side curved surface (9), the light is condensed inside the lens (5) and then spreads again, and the light out from the emission-side curved surface (10) is condensed onto a light-receiving surface of the light-receiving device (2).