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Fiberoptic raster band width tuning device

A fiber grating and tuning device technology, which is applied in the fields of optics, nonlinear optics, optical waveguide coupling, etc., can solve the problem of no technical reports of fiber grating bandwidth tuning devices, and achieves a simple structure, a large bandwidth range, and easy system integration. Effect

Inactive Publication Date: 2004-11-10
NANKAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The search results show that there is no technical report on the fiber grating bandwidth tuning device that is consistent with it

Method used

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  • Fiberoptic raster band width tuning device
  • Fiberoptic raster band width tuning device
  • Fiberoptic raster band width tuning device

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Embodiment Construction

[0020] figure 1 It is a schematic diagram of the fiber grating bandwidth tuning principle

[0021] Where: (a) the elastic beam is not bent, (b) the elastic beam is bent.

[0022] exist figure 2 In the structural diagram of the fiber Bragg grating bandwidth tuning device, the fiber Bragg grating bandwidth tuning device includes fiber grating, elastic beam, bracket, force application bolt, fixing bolt, outer frame, fiber coupler, photodetector, light source, matching liquid, grating paste There are two ways of location, specifically:

[0023] Mode 1: The elastic beam is a simply supported beam (2), the fiber grating (1) is pasted on the side of the center of the beam, the two ports on the same side of the fiber coupler (8), and one end is connected to the optical fiber obliquely pasted on the side of the elastic beam The single-mode optical fiber (7) drawn from the grating is connected, and the other end is placed in the matching liquid (11); and the two ports on the other s...

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Abstract

The invention relates to an optical fiber grating bandwidth tuning device, specially applying to tune the bandwidths of single or many optical fiber gratings, including optical fiber grating, elastic beam, single mode optical fiber, optical fiber coupler, matching liquid, etc. It pastes the optical fiber Prague grating on a side surface of the adjustable-curvature rectangular elastic beam by special glue in the inclined direction, makes the axis of the grating and the neutral surface of the elastic beam form a certain included angle and ensures the midpoint of the grating precisely situated on the neutral surface of the elastic beam. It has two grating pasting modes: if the elastic beam is a simple strutbeam, the grating is pasted on the side surface in the middle of the beam; if the elastic beam is a cantilever beam, the grating is pasted on the side surface near to the fixed end of the beam. When the elastic beam bends in the elastic range, because the layers at all heights on the beam produce different strains so as to cause the period change of all the grids on two sides of the grating center, it makes the grating generate strain gradient axially, accordingly resulting in the width change of the optical fiber grating. By changing the curvature of the elastic beam, it can implement the high-precision tuning of the optical fiber grating.

Description

technical field [0001] The invention relates to a device for tuning the bandwidth of a fiber grating, in particular a device suitable for tuning the bandwidth of a single or multiple fiber gratings. Background technique [0002] Fiber Bragg grating is a new type of optical passive device, which is widely used in the fields of optical fiber communication and optical fiber sensing because of its excellent characteristics. Using the sensitive effect of fiber grating frequency selection characteristics on strain and temperature, many physical quantities can be sensed and measured, and various physical quantities (such as strain, stress, displacement, curvature, weight, voltage, current, magnetic field, air pressure, acceleration, etc.) can be designed and realized. etc.) and high-precision sensing measurement with automatic temperature compensation; conversely, by controlling the strain and temperature of the fiber grating, its wavelength and bandwidth can also be tuned, and tun...

Claims

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Application Information

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IPC IPC(8): G02B6/34G02F1/01
Inventor 张伟刚开桂云董孝义
Owner NANKAI UNIV
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