Device and method for online preparation of FBG (fiber bragg grating) array and automatic wavelength switching

A fiber grating array and automatic switching technology, which is applied in cladding optical fiber, optical waveguide, optical, etc., can solve the problems of difficult to achieve fast switching of mask plates, affect the quality of grating, and slow start-stop speed, etc., to achieve convenient optical path adjustment, The effect of good repeatability and fast switching speed

Active Publication Date: 2017-11-10
WUHAN UNIV OF TECH
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Problems solved by technology

[0004] Chinese patent application CN105259610A invented a multi-wavelength orderly switching device and method for online preparation of fiber grating arrays. Double dovetail tracks are adopted. This structure

Method used

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  • Device and method for online preparation of FBG (fiber bragg grating) array and automatic wavelength switching
  • Device and method for online preparation of FBG (fiber bragg grating) array and automatic wavelength switching
  • Device and method for online preparation of FBG (fiber bragg grating) array and automatic wavelength switching

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Embodiment 1

[0035] A device for automatically switching wavelengths for on-line preparation of fiber grating arrays, including: a photoelectric encoder for sending pulse signals according to the rotation angle of the active pulley of the wire drawing tower, the pulse signal period corresponds to the minimum resolution of the light length, and the minimum resolution is based on the photoelectric code The code number of the device and the radius of the active traction wheel are determined; the pulse counter is used to count the pulse signal; the phase mask array includes the substrate, and the phase masks arranged at intervals on the substrate according to the grating sequence to be written The interference area is used to cooperate with the laser pulse emitted by the excimer laser to complete the writing of the grating; the moving mechanism is used to adjust the position of the phase mask array so that the phase mask interference area is sequentially aligned with the excimer laser for gratin...

Embodiment 2

[0037] The invention provides an on-line device for automatically switching wavelengths of fiber grating arrays, such as figure 1 As shown, it includes a photoelectric encoder for sending pulse signals according to the rotation angle of the active pulley of the drawing tower. The pulse signal period corresponds to the minimum resolution of the fiber length. The minimum resolution is based on the code number of the photoelectric encoder and the radius of the active pulley Determine; the pulse counter is used to count the pulse signals; the phase mask array 3 includes a substrate 301, and phase mask interference regions 302 arranged at intervals on the substrate 301 according to the grating order to be written are used for Cooperate with the laser pulses emitted by the excimer laser to complete the writing of the grating; the moving mechanism is used to adjust the position of the phase mask array 3, so that the phase mask interference area 302 is sequentially aligned with the exc...

Embodiment 3

[0041] Using the device for automatically switching wavelengths of fiber grating arrays on-line prepared in Embodiment 2, this embodiment provides a method for automatically switching wavelengths, such as figure 2 As shown, it includes the following steps:

[0042] S1. During the fiber drawing process, the photoelectric encoder sends a pulse signal according to the rotation angle of the active traction wheel of the drawing tower. The pulse signal period corresponds to the minimum resolution of the fiber length. The minimum resolution is based on the code number of the photoelectric encoder and the radius of the active traction wheel OK; the minimum resolution is calculated according to the following formula:

[0043] r=2*π*R / N,

[0044] In the formula, r is the arc length interval of the signal sent by the photoelectric encoder, that is, the minimum resolution; R is the radius of the active traction wheel; N is the number of pulse signals sent by the photoelectric encoder fo...

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Abstract

The invention provides a device for the online preparation of an FBG (fiber bragg grating) array and automatic wavelength switching, and the device comprises a photoelectric encoder which is used for transmitting a pulse signal according to the rotating angle of a driving traction wheel of a wire drawing tower; a pulse counter; a phase mask plate array; a mobile mechanism which is used for adjusting the position of the phase mask plate array, enabling phase mask interference regions to be sequentially aligned with molecular lasers for grating scribing according to a sequence. When a count value of the pulse counter reaches a set value, the laser emits the laser pulse, and a linear motor moves the phase mask plate. According to the invention, the phase mask interference regions are arranged according to the sequence. Through obtaining a fiber drawing length, the device controls the laser emission of the molecular lasers and the movement of the moving mechanism, enables the phase mask plate array to move accurately according to the design requirements. The device is high in switching speed, is good in repeatability, and is high in precision.

Description

technical field [0001] The invention belongs to the field of optical fiber grating preparation, in particular to a device and method for automatically switching wavelengths for on-line preparation of optical fiber grating arrays. Background technique [0002] With the continuous expansion of the application scale of optical fiber sensors, the rapid enhancement of sensing capabilities, and the increasing variety of sensing types, optical fiber sensing technology is continuously developing in the direction of high performance, densification and networking, and a new generation of large-capacity dense optical fiber sensor networks is being developed. It has become a major topic of the new wave of informationization. [0003] Fiber Bragg Grating is a new generation of optical passive devices that has developed very rapidly in recent years. It has the advantages of simple manufacture, good stability, small size, flexible use, easy integration with optical fibers, and the ability ...

Claims

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Application Information

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IPC IPC(8): G02B6/02G03F7/00
CPCG02B6/02123G02B6/02138G03F7/0005
Inventor 唐健冠商福发郑洲刘传广邓艳芳杨明红王洪海甘维兵
Owner WUHAN UNIV OF TECH
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