A linear continuously adjustable light attenuation unit

Abstract

The invention provides a linear type continuous variable optical attenuation unit which mainly consists of a linear module, a strip-shaped optical filter, two optical fiber collimators, a motor and a photoelectric encoder, wherein the two optical fiber collimators are respectively arranged at middle positions of two corresponding frames of the linear module and are aligned with each other; a precision lead screw and a slide block are arranged on the linear module; the strip-shaped optical filter is fixed on the slide block of the precision lead screw; one end of the motor is connected with the photoelectric encoder, and the other end of the motor is connected with the precision lead screw; the strip-shaped optical filter is driven to move between the two optical fiber collimators by utilizing rotation of the motor, the position of the strip-shaped optical filter is encoded by utilizing the photoelectric encoder, and the strip-shaped optical filter is accurately positioned, so that continuous and accurate attenuation of optical power is realized. By adoption of the scheme, the insertion loss of the novel optical attenuation unit system is reduced, and the reliability of the system is improved; the return loss of the optical attenuation unit is increased, and a front-loading light path is protected.

Description

technical field [0001] The invention belongs to the technical field of adjustable light attenuation, and in particular relates to a linear continuously adjustable light attenuation unit. Background technique [0002] Adjustable optical attenuator is one of the commonly used instruments in optical fiber communication systems. Its main function is to accurately attenuate the intensity of optical signals. It is widely used in teaching experiments, R&D and production testing of optical devices, and construction and maintenance of optical fiber communication networks. The optical attenuation unit is the core component of the adjustable optical attenuator, and the quality of its design will directly affect the level of various performance indicators of the adjustable optical attenuator. [0003] Traditional optical attenuation units such as figure 1 As shown, the incident light is collimated by the fiber collimator, attenuated by two circular filters, and finally enters the outpu...

AI Technical Summary

Problems solved by technology

[0004] The traditional optical attenuation unit has the following disadvantages: On the one hand, due to the use of two filters, the traditional optical attenuation unit will inevitably produce power jumps when performing 10dB step shifts. For some test occasions, this situation is unacceptable; on the other hand, the traditional optical attenuation unit needs two filters and two motors, which not only increases the insertion loss, but any problem with any one of the filters or motors will affect the performance of the attenuator. normal operation, reducing the reliability of the instrument

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