Method for positioning initial position of attenuation piece of mechanical variable optical attenuator

By adopting a dual-end shaft motor and a two-stage positioning system in a mechanical dimmable optical attenuator, high-precision positioning of the initial position of the attenuator is achieved, which solves the problem of inaccurate positioning in the prior art and improves the attenuation accuracy and repeatability.

CN119717251AActive Publication Date: 2025-03-28CHINA ELECTRONIS TECH INSTR CO LTD
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Patent Information

Application Number
CN202411959747.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-28
Estimated Expiration
2044-12-30

AI Technical Summary

Technical Problem

When the existing mechanical dimmable optical attenuator is started, the initial position position of the attenuator is inaccurate, resulting in inaccurate key technical indicators such as attenuation accuracy, linearity and insertion loss, and poor repeatability.

Method used

A double-end shaft-output motor with reduction ratio and a two-stage positioning system are adopted. The first-stage positioning system is roughly positioned through the optocoupler device and the motor's broken step rotation, and the second-stage positioning system uses the CHI signal of the encoding system for precise positioning to ensure the stability of the initial position of the attenuation plate.

Benefits of technology

It improves the positioning accuracy of the initial position of the attenuation plate, ensures the attenuation accuracy and repeatability indicators of the dimmable optical attenuator, and improves the stability and consistency of the instrument.

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Abstract

The invention belongs to the technical field of attenuation slices of variable optical attenuators, and particularly relates to an initial position positioning method for an attenuation slice of a mechanical variable optical attenuator, initial positioning of the attenuation slice is realized by using an attenuation slice initial position positioning system, and the attenuation slice initial position positioning system comprises a motor, a light blocking slice, an optocoupler device, a coding disc and a coding module; according to the method, two-stage positioning is achieved through inconsistent rotating speeds of the two ends of the double-end output shaft motor, the attenuation piece is roughly positioned through a level conversion signal of an optocoupler by adopting a motor broken-step rotating mode in the first stage, and the initial position of the attenuation piece is accurately positioned through a CHI signal of a coding system in the second-stage positioning system. According to the invention, the two-stage positioning system is adopted, and the response time of the coding system can reach the ns stage, so that the initial position positioning precision of the attenuation slice is further improved, and the attenuation accuracy and repeatability index of the variable optical attenuator are ensured.
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