Optical Receiver Beam Reducer for Low Reflected Return Light
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Solution Overview
Problem
Existing optical receivers face challenges in reducing reflected return light while maintaining high light receiving sensitivity, as simply arranging components with high accuracy can lead to excessive reflected light amounts on the light receiving element.
Innovation Solution
The optical receiver incorporates a beam reducer with an incident lens and an emitting lens, along with a light receiving element featuring a light receiving lens, to convert first collimated light into second collimated light of a smaller diameter, thereby reducing reflected return light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If components are arranged with high accuracy to achieve desired photoelectric conversion characteristics, then light receiving sensitivity is improved, but reflected return light amount increases excessively
Solution Approach 1:
A beam reducer is introduced as an intermediary component between the optical demultiplexer and the light receiving element. This beam reducer includes a first lens that condenses light from the optical demultiplexer and a second lens that emits collimated light toward the light receiving element. The beam reducer acts as a mediator that transforms the light path, reducing the diameter of collimated light before it reaches the light receiving element, thereby decreasing the reflected return light amount while maintaining proper optical coupling for high sensitivity reception.
Solution Approach 2:
The beam reducer changes the parameter of light diameter in the optical path. By condensing light with the first lens and then emitting collimated light with a smaller diameter through the second lens, the system modifies the light beam parameters (diameter, collimation) to reduce the amount of reflected light returning to the optical demultiplexer, while still ensuring adequate light coupling to the light receiving element for maintaining sensitivity.
2Object-generated harmful factors
If a beam reducer is introduced to reduce reflected return light, then reflected return light amount is reduced, but device complexity increases
Solution Approach 1:
The beam reducer merges two lens functions (condensing and collimating) into a single integrated component assembly. The first lens and second lens are positioned within the beam reducer housing, working together as a unified optical subsystem. This merging approach reduces the need for separate adjustment mechanisms and simplifies the overall optical path design compared to using multiple independent components.
Solution Approach 2:
The beam reducer serves as an intermediary that simplifies the optical path by providing a fixed, pre-configured light transformation function. Rather than requiring complex adjustment mechanisms to control light diameter and collimation, the beam reducer provides a straightforward mediating function that reduces reflected light while maintaining ease of assembly and alignment.
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 reduces reflected return light to 1/1000 or less of the original light amount, while preserving the light receiving sensitivity of the element.
Implementation Method 1
an incident lens condensing first collimated light having a first diameter to a focal point
Implementation Method 2
an emitting lens receiving light emitted from the incident lens and emitting second collimated light having a second diameter smaller than the first diameter
Implementation Method 3
a light receiving lens condensing the second collimated light
Data Source
AI summary
According to one embodiment, there is provided an optical receiver including: a beam reducer including an incident lens condensing first collimated light having a first diameter to a focal point, an emitting lens receiving light emitted from the incident lens and emitting second collimated light having a second diameter smaller than the first diameter, and a main body provided between the incident lens and the emitting lens, the main body having the focal point inside; and a light receiving element including a light receiving lens condensing the second collimated light and a light receiving portion receiving the light condensed by the light receiving lens.