Grating type filter with adjustable spectrum shape

Abstract

The structure for preparing the grating type filter includes a laser, a mask, an optical fiber or optical wave-guide and a plane table. The mask is put above the optical fiber or wave-guide. The laser beam irradiates the mask perpendicularly. The optical fiber or optical wave-guide is fixed on the plane table. The mask and the optical fiber or optical wave-guide can rotate around the axis perpendicular to the plane table. The plane table, the mask and the laser beam can translate relative by the direction of the optical fiber or the wave-guide. The invention is suitable for preparing the grating type filter with adjustable spectrum shape on the photoconductive optical fiber or optical wave-guide. The invention provides the features of simple structure, low cost and can be applied to the optical communication area.

Description

technical field

[0001] The invention belongs to the field of optical applications, in particular to a grating filter whose spectrum shape can be adjusted. Background technique

[0002] Grating filters have the advantages of small size, simple structure, and low cost, and are widely used in optical communication and other fields.

[0003] At present, the grating-type filter is generally made of a mask by using a single-exposure method, that is, the mask is placed above the optical fiber or waveguide, and the mask is irradiated with laser light, so that the deflection of the optical fiber or waveguide changes periodically, and the grating filter is obtained. . The structure of the grating filter thus produced mainly includes a mask plate, an optical fiber or a waveguide, and a laser. The mask plate is placed on the optical fiber or waveguide, and the laser beam emitted by the laser is irradiated on the mask plate.

[0004] Under the condition that the refractive index of th...

Examples

Embodiment 1

[0019] In the process of designing a grating filter with adjustable spectral shape, we use a stepping motor to control the relative rotation between the mask 2 and the optical fiber or waveguide 3 and the relative translation between the platform 4, the mask 2, and the laser beam. For this purpose, a stepper motor is also included in the structure. The stepping motor can drive the mask plate 2 or / and the platform 4 to rotate through the transmission device, and drive the platform 4, the mask plate 2, and the laser 1 to move in translation.

Embodiment 2

[0021] The relative rotation between the mask plate 2 and the optical fiber or waveguide 3 and the relative translation of the platform 4, mask plate 2, and laser beam can be controlled by a stepping motor, that is, the structure includes a computer control system. The computer control system controls the relative rotation of the mask 2 or / and the platform 4 , and controls the relative translation of the platform 4 , the mask 2 and the laser 1 .

[0022] Therefore, the production of grating filters has high precision and accuracy. When making grating filters with different spectral shapes, we don't need to change the mask, just change the control program of the computer to achieve the goal.

technical field

[0001] The invention belongs to the field of optical applications, in particular to a grating filter whose spectrum shape can be adjusted. Background technique

[0002] Grating filters have the advantages of small size, simple structure, and low cost, and are widely used in optical communication and other fields.

[0003] At present, the grating-type filter is generally made of a mask by using a single-exposure method, that is, the mask is placed above the optical fiber or waveguide, and the mask is irradiated with laser light, so that the deflection of the optical fiber or waveguide changes periodically, and the grating filter is obtained. . The structure of the grating filter thus produced mainly includes a mask plate, an optical fiber or a waveguide, and a laser. The mask plate is placed on the optical fiber or waveguide, and the laser beam emitted by the laser is irradiated on the mask plate.

[0004] Under the condition that the refractive index of th...

Examples

Embodiment 1

[0019] In the process of designing a grating filter with adjustable spectral shape, we use a stepping motor to control the relative rotation between the mask 2 and the optical fiber or waveguide 3 and the relative translation between the platform 4, the mask 2, and the laser beam. For this purpose, a stepper motor is also included in the structure. The stepping motor can drive the mask plate 2 or / and the platform 4 to rotate through the transmission device, and drive the platform 4, the mask plate 2, and the laser 1 to move in translation.

Embodiment 2

[0021] The relative rotation between the mask plate 2 and the optical fiber or waveguide 3 and the relative translation of the platform 4, mask plate 2, and laser beam can be controlled by a stepping motor, that is, the structure includes a computer control system. The computer control system controls the relative rotation of the mask 2 or / and the platform 4 , and controls the relative translation of the platform 4 , the mask 2 and the laser 1 .

[0022] Therefore, the production of grating filters has high precision and accuracy. When making grating filters with different spectral shapes, we don't need to change the mask, just change the control program of the computer to achieve the goal.

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