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Large-range adjustable optical attenuation unit based on cascaded optical filters and control method

A dimming attenuation and optical filter technology, applied in optical components, optical waveguide coupling, optics, etc., can solve problems such as poor attenuation repeatability, lower attenuation accuracy, and small dynamic range, so as to reduce quantity, improve attenuation accuracy, The effect of avoiding errors

Active Publication Date: 2020-12-04
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Disadvantages of adjustable optical attenuators on the market: 1. The dynamic range of the existing high-precision adjustable optical attenuators is very small, about 60dB; 2. The existing large dynamic adjustable optical attenuators are due to mechanical The air travel difference generated during the operation of the transmission device leads to poor attenuation repeatability; 3. The existing large dynamic adjustable optical attenuator has no optical fiber connection between the two filters, which generates stray light and reduces the attenuation accuracy; 4. Now Some attenuation unit control methods of adjustable optical attenuators will generate errors at the switching point of filter rotation and will also reduce attenuation accuracy

Method used

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  • Large-range adjustable optical attenuation unit based on cascaded optical filters and control method
  • Large-range adjustable optical attenuation unit based on cascaded optical filters and control method

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Effect test

Embodiment 1

[0018] One embodiment of the present invention is to propose a wide range adjustable light attenuation unit based on cascade filters, such as figure 1 As shown, it includes: the motor 14, the first filter 31 are coaxial with a gear of the conveyor belt 13, the second filter 32 is coaxial with another gear of the conveyor belt 13, the two gears are driven by the conveyor belt 13, and the first filter The optical sheet 31 and the second optical filter 32 can rotate at the same speed at the same time to realize the light attenuation function. After the attenuation value of the optical attenuator is set, the rotation of the motor shaft drives the first optical filter 31 and the second optical filter 32 driven by the conveyor belt to rotate simultaneously. After the motor 14 stops rotating, the optical path is aligned with the coating area of ​​the corresponding attenuation value, and the light After being collimated by the first optical collimator 21 , the light is attenuated by t...

Embodiment 2

[0021] On the basis of Embodiment 1, in order to improve the attenuation accuracy of the optical attenuator, the present invention also proposes a control method for the optical attenuation unit based on the above-mentioned cascade filter-based wide-range adjustable optical attenuation unit, specifically Steps such as Figure 1-Figure 2 Shown:

[0022] Step 1: Utilize based on such as figure 1 The wide-range adjustable light attenuation unit based on the cascaded optical filter is the same as that in Embodiment 1, connected to the optical path, the light source input is connected to the optical input port 10, and the optical output port 12 is connected to the next-level optical path;

[0023] Step 2: Set the light attenuation value V;

[0024] Step 3: Calculate the attenuation value U=V / 2 corresponding to each filter; since the belt drive is used to control the rotation of the filter, the two filters will rotate at the same angle, so each filter achieves The falloff value i...

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Abstract

The invention discloses a large-range adjustable optical attenuation unit based on cascaded optical filters and a control method. According to the unit, a motor, a first optical filter and a gear of aconveyor belt are coaxial, a second optical filter and the other gear of the conveyor belt are coaxial, and the two gears are in transmission through the conveyor belt. The first optical filter 1 andthe second optical filter can rotate at the same speed at the same time, and the light attenuation function is achieved. After the attenuation value of the optical attenuator is set, the motor shaftrotates to drive the first optical filter and the second optical filter driven by the conveyor belt to rotate at the same time, after the motor stops rotating, the optical path is aligned with the coating area with the corresponding attenuation value, light is collimated by the first optical collimator, and light attenuation is achieved through the first optical filter, the spatial light path andthe second optical filter. And finally, the attenuated light is obtained through convergence of the second optical collimator. According to the novel light attenuation unit, the attenuation accuracy is improved through the stray light absorption device and the control method.

Description

technical field [0001] The present invention relates to the technical field of adjustable light attenuators, in particular to a cascaded filter-based wide-range adjustable light attenuation unit and a control method. Background technique [0002] With the advent of the 5G era, optical communication technology has become the main field of competition for major communication companies, and adjustable optical attenuators have become the main test instruments in the field of optical communication, and the market demand is very large. At the same time, adjustable optical attenuators are also widely used in optical device production testing, teaching research and other fields. The optical attenuation unit of the adjustable optical attenuator is its core component. The quality of the optical attenuation unit design and the reliability of its control method determine the performance index of the adjustable optical attenuator. [0003] Disadvantages of adjustable optical attenuators...

Claims

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Application Information

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IPC IPC(8): G02B6/26G02B26/00G02B7/00
CPCG02B6/266G02B26/008G02B7/006
Inventor 张一琪徐玉华尹炳琪徐桂城鞠军委吕振川谭景甲
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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