Light Receiving Device for Optical Space Communication
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Solution Overview
Problem
Existing optical space communication devices require large condensing lenses and high-sensitivity photodiodes, leading to increased costs and device size, as they struggle to efficiently receive spatial light without using a condensing lens.
Innovation Solution
A light receiving device comprising a first light guide body and a second light guide body, with directional reflection parts, that directionally guides signal light from the first light receiving surface to the second light receiving surface, allowing efficient light reception without the need for a condensing lens, using a cylindrical or ring-shaped configuration to enhance light collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large condensing lens is used to receive spatial light, then the amount of light received by the photoelectric conversion device increases, but the device size increases
Solution Approach 1:
The patent introduces a light guide body as an intermediary component between the spatial light and the photoelectric conversion device. The light guide body collects spatial light through its light receiving surface and guides it directionally to the photoelectric conversion device, eliminating the need for a large condensing lens while maintaining efficient light reception
Solution Approach 2:
The patent replaces the traditional mechanical condensing lens system with a light guide body that uses total internal reflection and directional guidance mechanisms to achieve light collection and concentration, thereby reducing device size while maintaining light reception efficiency
2Speed
If a low-capacitance photodiode is used for high-speed communication, then communication speed increases, but device cost increases
Solution Approach 1:
The light guide body acts as a mediator that concentrates spatial light onto the photodiode, enabling ordinary photodiodes to receive sufficient light intensity for high-speed communication without requiring expensive low-capacitance photodiodes
Solution Approach 2:
The patent changes the light reception parameter by using a light guide body with specific refractive index and geometric configuration to optimize light guidance efficiency, allowing standard photodiodes to achieve high-speed communication performance
3Quantity of substance
If a large lens aperture is used to increase light reception, then the amount of light received increases, but the device size increases
Solution Approach 1:
The light guide body serves as an intermediary that collects light over its receiving surface area and concentrates it onto a smaller active area of the photodiode, achieving high light reception efficiency without requiring a large aperture lens
Solution Approach 2:
The patent transitions from two-dimensional light collection at the lens aperture to three-dimensional light guidance within the light guide body, utilizing the volume of the light guide to concentrate light onto the photodiode surface, thereby decoupling light reception capability from device footprint
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 solution enables efficient reception of spatial light, reducing the need for expensive photodiodes and minimizing device size by effectively guiding and converting signal light into electric signals without relying on a condensing lens.
Implementation Method 1
a first light guide body including at least a first light receiving surface and a first emitting end and directionally guiding signal light entering from the first light receiving surface to the first emitting end
Implementation Method 2
a light receiver including a light receiving part connected to the second emitting end and converting the signal light received by the light receiving part into an electric signal
Data Source
AI summary
In order to efficiently receive spatial light without using a condensing lens, this light receiving device comprises: a first light guide body that has at least a first light receiving surface and a first light emission end and guides, in an oriented manner, signal light entering from the first light receiving surface to the first light emission end; a second light guide body that has at least a second light receiving surface and a second light emission end, the second light receiving surface being connected to the first light emission end, and that guides, in an oriented manner, signal light entering from the second light receiving surface to the second light emission end; and a light receiver that has a light receiving part connected to the second light emission end and that converts the signal light received by the light receiving part to an electrical signal.