Magnetic-control variable optical attenuator based on magnetofluid and core-free optical fiber

Abstract

The invention relates to the field of optical fiber communication and optical fiber laser, and provides a non-mechanical variable optical attenuator which is simple in structure and easy to manufacture. According to the technical scheme, a magnetic-control variable optical attenuator based on magnetofluid and of a single mode-multimode-single mode structure comprises an input optical fiber, a multimode core-free optical fiber, the magnetofluid, an output optical fiber, a capillary, an electromagnet and a current source, wherein the input optical fiber and the output optical fiber are both standard single-mode optical fibers, optical signals enter the multimode core-free optical fiber from the input optical fiber, part of the multimode core-free optical fiber is arranged in the quartz capillary with an appropriate inner diameter and is filled with the magnetofluid so that the multimode core-free optical fiber can be fully immersed in the magnetofluid, the two ends of the quartz capillary are sealed through optical curing glue, the optical signals passing through the multimode core-free optical fiber are finally coupled into the output optical fiber and output, the magnetic induction intensity of the electromagnet is changed by adjusting the current of the current source, and therefore attenuation of the optical fibers are caused. The magnetic-control variable optical attenuator based on the magnetofluid and the core-free optical fiber are mainly applied to the occasions of laser and optical fiber communication.

Description

technical field [0001] The invention relates to the fields of optical fiber communication and optical fiber laser, in particular, the invention relates to a magnetic control adjustable optical attenuator based on magnetic fluid and coreless optical fiber. Background technique [0002] Optical attenuator is an important fiber optic passive device. According to whether the attenuation is tuned, it can be divided into fixed attenuator and adjustable attenuator. The adjustable attenuator can flexibly adjust the power of the optical signal in the optical fiber according to the needs, and is a very important component in the all-fiber network. Most of the existing tunable optical attenuators adopt a mechanical adjustment method, such as moving a gradient light absorption attenuator, or controlling the bending degree of an optical fiber by a mechanical method. However, the mechanical adjustment method has high requirements on the precision and stability of the mechanical transmiss...

AI Technical Summary

Problems solved by technology

However, the mechanical adjustment method has high requirements on the precision and stability of the mechanical transmission device, the manufacturing process is complicated, the cost is high, and the vibration of the attenuator during work will also cause instability and poor repeatability of the system loss.

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