Optical fiber delay device

Abstract

The invention relates to a fiber time delaying device. The device comprises a petal ring column formed by a plurality of arc blocks pieced together. A fiber can be wound on the outer circumferential wall of the petal ring column along the circumferential direction. The device also comprises an adjustment mechanism which is arranged to drive each arc block to move outward along the radial direction so that the fiber wound around the outer circumferential wall of the petal ring column can be stretched by the radially expanded petal ring column. The device can stretch the fiber and change the delaying time of the fiber continuously so that adjustment of the time delay is continuous.

Description

technical field [0001] The invention relates to the technical field of optical fiber delay line devices, in particular to an optical fiber delay device for optical fiber delay line devices. Background technique [0002] Optical fiber delay line devices are widely used in optical fiber sensors, optical encoders, optical decoders or optical buffers and other equipment. The fiber delay device composed of optical fiber is the core component of the fiber delay line device, and the adjustment range of its delay time directly determines the performance of the fiber delay line device. [0003] The delay time mainly depends on the length of the fiber and the refractive index of the fiber. The optical fiber delay device of the existing optical fiber delay line device mainly selects optical fibers of different lengths or different optical waveguides (affecting the refractive index) by cascading optical switches, so as to obtain different delay times. However, since the number of dela...

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Problems solved by technology

However, since the number of delay times of the optical fiber delay device is equal to the number of optical fibers, the value of the delay time is in one-to-one correspondence with the length of the optical fiber, so that the adjustment of the delay time is a discrete form of adjustment

[0004] For example, an existing optical fiber delay device consisting of optical fiber A and optical fiber B, wherein the delay time corresponding to optical fiber A is X, and the corresponding delay time of optical fiber B is Y, when the optical fiber delay device passes through cascaded optical switches When fiber A is selected, the delay time of the fiber delay device is X, and when the fiber delay device selects fiber B through the cascaded optical switch, the delay time of the fiber delay device is Y, because the cascaded optical switch has been There is no other choice, resulting in the adjustment range of the fiber optic delay device only including the two discrete points of delay time X and delay time Y, and it is impossible to obtain any delay time between X and Y

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