KR20220039250A - Appratus and Method for high-speed Manufacturing Fiber Bragg Grating using laser micro-scanning technology - Google Patents

Abstract

The present invention relates to an apparatus and method for high-speed manufacturing an optical fiber bragg grating using a laser micro-scanning technology. The apparatus comprises: a light source radiating a laser beam for processing; a scanner reflecting the laser beam radiated from the light source in a pre-set direction to scan the laser beam by a pre-set area; an object lens focusing the laser beam incident through the scanner to radiate the laser beam on a location for processing an optical fiber; a scanning adaptor making the laser beam reflected from the scanner incident to an opening unit of the object lens; and a stage settling and moving the optical fiber in a pre-set moving speed and moving direction.

Description

Appratus and Method for high-speed Manufacturing Fiber Bragg Grating using laser micro-scanning technology

The present invention relates to an apparatus and method for high-speed manufacturing of an optical fiber Bragg grating using laser micro-scanning technology for manufacturing a fiber Bragg grating by directly processing a fine grating on an optical fiber.

The content described in this section merely provides background information on an embodiment of the present invention and does not constitute the prior art.

Fiber Bragg grating (FBG), which is formed by irradiating an optical fiber with UV light through a phase mask, applies the principle of a thin film filter to the optical fiber, and applies UV light to the optical fiber itself. By irradiating it, a periodic refractive index change can be made to reflect light of a specific wavelength. However, despite excellent characteristics, FBG has disadvantages in that it is difficult to reduce its size due to the characteristics of optical fibers, integration with other optical devices is difficult, and mass production is not easy.

1 is a view for explaining an apparatus for manufacturing an optical fiber Bragg grating according to the prior art.

As shown in FIG. 1 , an apparatus for fabricating an optical fiber Bragg grating includes a laser light source 11 , a mirror 12 , a cylindrical lens 13 , and a phase mask 14 .

The laser light source 11 irradiates laser light of an ultraviolet wavelength band through the phase mask 14 to the core of the optical fiber 10 supported by a support means (not shown).

The laser light irradiated from the laser light source 11 is changed at right angles by the mirror 12 and becomes parallel light by the cylindrical lens 13 . In this case, the cylindrical lens 13 may have a focal length of 30 cm.

A line is focused in the longitudinal direction of the optical fiber by the cylindrical lens 13 , and the laser light passing through the cylindrical lens 13 is irradiated to the optical fiber through the phase mask 14 . At this time, the left and right adjustment of the laser light is made using the angle of the mirror 12 , and the supporting means (not shown) supporting the mirror 12 , the cylindrical lens 13 , the phase mask 14 and the optical fiber 10 is All can be mounted on the same rail to improve alignment.

The portion irradiated with laser light in the ultraviolet wavelength band increases the refractive index of the optical fiber core, and this portion is called a grating. Each periodic grating reflects a part of the traveling light, and when the grating period is about half the wavelength of the incident light, when all the reflected light signals are combined by coherence, it becomes one large reflected light at a specific wavelength. , this is called the Bragg condition, and the reflected wavelength is called the Bragg wavelength. Light having a wavelength other than the Bragg wavelength is transmitted out of phase. Therefore, only light having a wavelength that satisfies the Bragg condition is affected, and reflection occurs in the opposite direction to the incident direction.

The FBG produced by this phase mask method reacts the material contained in the optical fiber with laser light to produce a microlattice by changing the optical fiber's composition. will be greatly influenced by In addition, since the conventional optical fiber Bragg grating has to be manufactured using only an optical fiber containing germanium (Ge) that responds to a laser beam of an ultraviolet wavelength band, the FBG is inevitably dependent on the material doped in the optical fiber.

An object of the present invention is to produce an FBG by periodically generating a microlattice directly inside an optical fiber using a laser scanning processing method to which an objective lens is applied according to an embodiment of the present invention in order to solve the above problems.

However, the technical task to be achieved by the present embodiment is not limited to the technical task as described above, and other technical tasks may exist.

As a technical means for achieving the above technical problem, a high-speed manufacturing apparatus of an optical fiber Bragg grating using a laser micro-scanning technique according to an embodiment of the present invention includes: a light source for irradiating a laser beam for processing; a scanner that reflects a laser beam irradiated from a light source in a preset direction to scan a preset area; an objective lens for focusing the laser beam incident through the scanner and irradiating it to a processing position of the optical fiber; a scanning adapter for injecting the laser beam reflected from the scanner into the opening of the objective lens; and a stage for seating and moving the optical fiber at a preset moving speed and moving direction.

The scanning adapter includes a first lens disposed on an optical path of the light source and the scanner to focus a laser beam that is irradiated from the light source and is incident on the scanner, and converts the laser beam reflected from the scanner into parallel light. and a second lens made of , and a third lens for changing the optical path of the laser beam reflected from the scanner in the direction of the opening of the objective lens.

A high-speed manufacturing apparatus of an optical fiber Bragg grating using a laser micro-scanning technology moves the optical fiber to a processing position through position control of the stage, performs pattern processing with a preset processing line width and processing depth inside the optical fiber, and It is characterized in that it includes a control unit for controlling the operation of each configuration so that the pattern processing is repeated more than a preset number of times to generate a fine grid.

On the other hand, in the high-speed manufacturing method of the optical fiber Bragg grating using the laser micro-scanning technology for manufacturing the optical fiber Bragg grating using the objective lens according to an embodiment of the present invention, a) When the laser beam for processing is irradiated, the irradiation performing a scanning process of scanning a preset area by reflecting the laser beam in a preset direction; b) changing the path of the laser beam to be incident into the opening of the objective lens through a scanning adapter that converts the laser beam reflected through the scanning process into parallel light; c) focusing the laser beam incident through the scanning adapter with an objective lens and irradiating it with an optical fiber placed on a stage; and d) manufacturing a fiber Bragg grating by repeatedly processing a pattern having a predetermined processing line width and processing depth a predetermined number of times according to the processing direction of the stage to generate a fine grid. could be a way

In step b), a focus is set at a processing position for creating a fine grating inside the optical fiber, and the property and path of the laser beam are determined using at least one lens so that the laser beam is focused on the set focus area. characterized by change.

On the other hand, in the optical fiber manufacturing system according to another embodiment of the present invention, in the optical fiber manufacturing system for manufacturing an optical fiber using a laser micro-scanning technology, the core and the surrounding surrounding the core are formed by melting and withdrawing the optical fiber base material. an optical fiber manufacturing apparatus for manufacturing an optical fiber including a clad; and a high-speed manufacturing apparatus for an optical fiber Bragg grating using laser micro-scanning technology installed at an end of the optical fiber manufacturing apparatus to form a Fiber Bragg grating (FBG) on the optical fiber.

According to the above-described means for solving the problems of the present invention, the present invention can produce a FBG by directly creating a microlattice inside an optical fiber using a laser scanning processing method to which an objective lens is applied, and does not depend on the material doped in the optical fiber There is an effect that can be usefully used for the use of optical fiber sensors.

1 is a view for explaining an apparatus for manufacturing an optical fiber Bragg grating according to the prior art.
2 is a diagram illustrating a configuration of a high-speed manufacturing apparatus for an optical fiber Bragg grating using a laser micro-scanning technique according to an embodiment of the present invention.
3 is a diagram illustrating the configuration of a scanner according to an embodiment of the present invention.
4 is a view showing one light path of a laser irradiated from a high-speed manufacturing apparatus of an optical fiber Bragg grating using a laser micro-scanning technique according to an embodiment of the present invention.
5 is an exemplary view showing a processing result of an object by the high-speed manufacturing apparatus of an optical fiber Bragg grating using a laser micro-scanning technique according to an embodiment of the present invention.
6 is a flowchart illustrating a high-speed manufacturing method of an optical fiber Bragg grating using a laser micro-scanning technique according to an embodiment of the present invention.
FIG. 7 is a view showing the manufacturing result of the optical fiber Bragg grating according to FIG. 6 .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is "connected" with another part, this includes not only the case of being "directly connected" but also the case of being "electrically connected" with another element interposed therebetween. . In addition, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated, and one or more other features However, it is to be understood that the existence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

The following examples are detailed descriptions to help the understanding of the present invention, and do not limit the scope of the present invention. Accordingly, an invention of the same scope performing the same function as the present invention will also fall within the scope of the present invention.

In addition, each configuration, process, process or method included in each embodiment of the present invention may be shared within a range that does not technically contradict each other.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram showing the configuration of an apparatus for high-speed manufacturing of an optical fiber Bragg grating using laser micro-scanning technology according to an embodiment of the present invention, and FIG. 3 is a diagram showing the configuration of a scanner according to an embodiment of the present invention. am.

Referring to FIG. 2 , an apparatus 100 for high-speed manufacturing of an optical fiber Bragg grating using laser micro-scanning technology includes a light source 110 , a scanner 120 , a micro-scanning adapter 130 , an objective lens 140 , and a stage 150 . and a control unit (not shown).

The light source 110 irradiates a laser beam for processing a fine grating inside the optical fiber 160 . Here, the light source 110 may be a microwave laser.

The scanner 120 scans by adjusting the direction of the laser beam irradiated from the light source 110 . The scanner 120 reflects the laser beam irradiated from the light source 110 and incident (the -x-axis direction in FIG. 2 ) in a preset direction (the -y-axis direction in FIG. 2 ). At this time, the scanner 120 finely adjusts the reflection angle according to the control of the controller (not shown) to adjust the position where the laser beam reflected in a preset direction is incident on the micro-scanning adapter 130 . The configuration of the scanner 120 is illustrated in detail in FIG. 2 .

As shown in FIG. 3 , the scanner 120 includes a mirror 210 , a beam splitter 220 , and motors 230 and 235 .

The mirror 210 reflects the laser beam that is irradiated from the light source and has passed through the beam splitter 220 in the direction of the beam splitter 220 again.

The beam splitter 220 passes the laser beam irradiated from the light source and reflects the laser beam reflected from the mirror 210 . The beam splitter 220 has a reflection angle for reflecting the laser beam in the direction in which the micro-scanning adapter 130 is located (the -y-axis direction in FIGS. 2 and 3), and the reflection angle is within a range preset by the motor 235. This adjustment changes the direction of the reflected laser beam. FIG. 2 illustrates that the beam splitter 220 adjusts the reflection angle in the x-axis direction by the motor 235, but is not limited thereto, and can also be adjusted in the z-axis direction. That is, since the beam splitter 220 can adjust the reflection angle on the x-z plane, the laser beam reflected in the -y axis can be scanned within a preset area (the adjustment range of the reflection angle). However, when the beam splitter 220 adjusts the reflection angle beyond the preset range, the laser beam cannot be incident on the objective lens 140, which will be described later, by adjusting the reflection angle within the preset range to scan the laser beam.

Motors 230 and 235 provide power to enable mirror 210 and beam splitter 220 to move. In particular, the motor 235 is mounted on the beam splitter 220 to provide power for the beam splitter 220 to adjust the reflection angle. As the beam splitter 220 adjusts the reflection angle by the motor 235, the laser beam can be scanned within a preset area, and the motor 230 moves the mirror 210 to the scanner 120. The overall direction of the laser beam reflected by the can be changed.

On the other hand, although FIG. 3 shows that the scanner 120 includes the mirror 120 and the beam splitter 220, it is not necessarily limited thereto, and a configuration capable of changing the direction of the laser beam incident in one direction (one For example, if it is implemented only with a plurality of mirrors) or a device (eg, a galvanometer scanner), it may be replaced with anything.

Referring back to FIG. 2 , the micro-scanning adapter 130 changes the nature and path of the laser beam reflected from the scanner 120 , and causes the laser beam to enter the aperture of the objective lens 140 . The laser beam reflected from the scanner 120 and scanned has a property of diverging light emitted by one component of the micro-scanning adapter 130 . However, when the light to be incident on the objective lens 140 is diverged, a sufficient amount of laser beam for processing is not incident on the objective lens 140 , so processing cannot be completed completely, and parts other than the objective lens 140 . There is a possibility that the laser beam emitted by the optical fiber Bragg grating may affect other components in the high-speed manufacturing apparatus 100 of the fiber Bragg grating or other parts other than the part being processed of the optical fiber 160 . In order to solve this problem, the micro-scanning adapter 130 changes the property of the scanned laser beam reflected from the scanner 120 into parallel light, and at the same time, the laser beam path is all incident into the opening of the objective lens 140 . change as much as possible.

The micro-scanning adapter 130 is connected to the scanner 120 by the connector 125 , and changes the property and path of the scanned laser beam reflected from the scanner 120 .

The objective lens 140 focuses the incident laser beam and irradiates it with the optical fiber 160 . The objective lens 140 receives the collimated light from the micro-scanning adapter 130 and focuses it onto the optical fiber 160 . However, since the laser beam incident to the objective lens 140 is scanned as much as a preset area by the scanner 120, the laser beam focused from the objective lens 140 is not irradiated with only one focus, but a preset area, Variable within the focal region set at the machining position to create a fine grating on the inside of the optical fiber, for example. Since the micro-scanning adapter 130 injects all the scanned laser beams reflected from the scanner 120 into the opening of the objective lens 140 , the high-speed manufacturing apparatus 100 of the optical fiber Bragg grating uses the objective lens 140 . Thus, it is possible to process a pattern with a constant interval, and at the same time, process it at a high speed using the scanner 120 . That is, by adjusting the laser line width by the objective lens 140 used in the micro-scanning adapter 130 , the optical fiber Bragg grating can be precisely processed to a desired processing line width and depth.

The stage 150 seats and moves the optical fiber 160 . The stage 150 moves the seated optical fiber 160 to a position for processing at the bottom of the objective lens 140 as the controller (not shown) precisely positionally controls the moving speed, the moving direction, and the like. In addition, the stage 150 moves the optical fiber to be exposed to a working position for processing of a different area when processing is completed in a certain area of the optical fiber 160, the FBG processing area, under the control of the controller (not shown), and the optical fiber When all processing is completed at 160, the optical fiber 160 is moved out of the working position.

A control unit (not shown) controls the operation of each component in the apparatus 100 for high-speed manufacturing of an optical fiber Bragg grating.

When the optical fiber 160 is to be processed, the controller (not shown) controls the light source 110 to irradiate the laser beam. When the fabrication of the fine gratings inside the optical fiber 160 is completed, the controller (not shown) controls the light source 110 to stop irradiating the laser beam.

The controller (not shown) adjusts the scanner 120 so that a fine grating can be manufactured inside the optical fiber without removing the coating of the optical fiber 160 . The controller (not shown) adjusts the scanner 120 to reflect the laser beam irradiated from the light source 110 in an appropriate direction for the microgrid production. In this case, continuous processing or high-speed processing of the fine grid inside the optical fiber is possible using the scanning speed of the control unit scanner 120 .

In addition, the controller (not shown) precisely positionally controls the stage 150 to move the optical fiber 160 to a working position for microgrid production, or a portion where the microgrid production of the optical fiber 160 is completed or finally FBG. The manufactured optical fiber 160 is moved out of the working position.

On the other hand, the high-speed manufacturing apparatus of the optical fiber Bragg grating using the laser micro-scanning technology may further include an illumination unit 170 and a camera unit 180 .

The illumination unit 170 irradiates illumination for confirming the surface state of the optical fiber 160 , and may irradiate illumination of a visible light wavelength band so that the user can confirm it.

The camera unit 180 receives the reflected light reflected from the optical fiber 160 and takes a picture. The illumination irradiated from the illumination unit 170 is irradiated to the optical fiber 160 by the micro scanning adapter 130 , and the reflected light reflected from the optical fiber 160 is photographed by the camera unit 180 via the micro scanning adapter 130 . . The camera unit 180 may display the captured laser scanning processed image as an image so that the user can check the current processing state, processing position, etc. of the optical fiber 160 in real time.

The user can check the current processing state of the optical fiber 160 through the laser scanning processed image captured by the camera unit 180 .

4 is a view showing one light path of the laser irradiated from the high-speed manufacturing apparatus of the fiber Bragg grating using the laser micro-scanning technology according to an embodiment of the present invention.

Referring to FIG. 4 , the laser beam irradiated from the light source 110 is irradiated in the form of parallel light.

Figure 4 (a) is a laser scanning processing method by a conventional laser processing apparatus, the laser beam scanned by the scanner 120 using an F-theta lens (F-theta lens) is placed on the object placed on the stage 150 is concentrated on processing.

The f-theta lens is designed to offset the phenomenon that the height of the image accelerates and increases as the height of the image increases further away from the center by adding an appropriate level of cylindrical distortion at the lens design stage. is calculated as However, the ftheta lens has a limitation in precision processing because the laser beam is incident with an inclination from the outer part of the scanning area.

Figure 4 (b) is a laser scanning processing method in which the objective lens 140 is applied to the existing laser processing apparatus, by using the scanner 120 to adjust the direction of the laser beam, the direction of the laser beam with the objective lens It is irradiated to the object through (140). At this time, when the laser beam whose direction has been adjusted by the scanner 120 is out of a preset range, the laser beam is not incident on the objective lens 140 , and the light to be incident on the objective lens 140 is emitted and processing is performed. A sufficient amount of the laser beam for this purpose is not incident to the objective lens 140, so processing cannot be completed, and there is a concern that the laser beam halved in this way may affect other components or parts other than the processing part of the optical fiber 160. exists

Therefore, as shown in FIG. 4(c), in the present invention, the laser scanning processing method is implemented using the micro-scanning adapter 130 and the objective lens 140 so that the line width of the laser beam is reduced to a size of about 1 μm. It makes it possible to directly engrave fine gratings one by one into the optical fiber at high speed.

The first lens 310 in the micro-scanning adapter 130 is disposed in the middle of the optical path between the light source 110 and the scanner 120 to focus the laser beam to be incident on the scanner 120 . The first lens 310 focuses the laser beam so that the laser beam passing through the first lens 310 is focused between the scanner 120 and the second lens 320 through the scanner 120 .

The laser beam passing through the first lens 130 passes through the scanner 120 and is reflected in a preset direction (-y-axis in the present invention). At this time, according to the reflection angle of the scanner 120, the direction in which the laser beam is reflected is different within a preset range.

The laser beam reflected from the scanner 120 is irradiated in different directions, is focused at different points, diverges, and is incident on the second lens 320 . As described above, the laser beam passes through the first lens 310 and is focused between the scanner 120 and the second lens 320 . Accordingly, the laser beam focused at the front end (on the optical path) of the second lens 320 is dispersed again and is incident on the second lens 320 . In FIG. 3 , the laser beams irradiated in different directions are illustrated as diverging after forming different focal points, but the present invention is not limited thereto, and the laser beams may have optical paths each diverging after forming the same focal point. .

The second lens 320 changes the path and properties of the incident laser beam to make it enter the objective lens 140 . The second lens 320 transforms the incident divergent light into parallel light in terms of the properties of the laser beam, and in the optical path, the angle of refraction increases as the distance from the center of the second lens 320 increases, and finally the objective lens It is incident into the opening of 140 . Accordingly, any laser beam reflected in any direction from the scanner 120 is incident on the opening of the objective lens 140 in the form of parallel light.

The second lens 320 may be implemented as a single lens that transforms the incident divergent light into parallel light and at the same time increases the angle of refracting it from the center to the end of the lens, and transforms the incident divergent light into parallel light. It may be implemented with a plurality of lenses that refract at different angles depending on the lens and the incident position (the lens is refracted from the center to the end of the lens). When the second lens 320 is implemented with a plurality of lenses, various aberrations that are inevitably generated in each lens can be compensated for with each other.

The laser beam incident on the objective lens 140 is focused on the optical fiber 160 through the objective lens 140 .

A laser beam is scanned within a preset range by the scanner 120 , and since the scanned laser beam passes through the second lens 320 and is completely incident on the objective lens 140 , it is irradiated from the objective lens 140 . The laser beam can be changed within a preset range while being focused to a fine focus. Accordingly, the laser processing apparatus 100 can perform the processing precisely and at the same time, it is possible to perform the laser processing quickly.

5 is an exemplary view showing a processing result of an object by the high-speed manufacturing apparatus of an optical fiber Bragg grating using a laser micro-scanning technique according to an embodiment of the present invention.

The high-speed manufacturing apparatus for optical fiber Bragg gratings using laser micro-scanning technology can laser process various materials, such as silicon wafers, silica, and PCB substrates, in addition to FBG.

The high-speed manufacturing apparatus of the optical fiber Bragg grating has a laser output of 1.3W (objective lens), 2.4W (micro scanning adapter), a moving speed of the stage 150 is 20 mm/s, and a processing speed of the scanning adapter 130 with a mask. 500mm/s, processing length 100㎛, objective lens 140 is set to 20 magnification (NA-0.40). When the stage 150 moves once, the processing line width and depth are measured on the surface of the silica by changing the processing repetition of horizontally high-speed repetitive processing in the processing direction.

As shown in FIG. 5 , as the number of processing repetitions increases, it can be confirmed that the processing depth is deepened while maintaining the processing line width on the surface of the silica to some extent. As an example, in one-time processing using only the objective lens, processing results of a processing line width of 14.6 μm and a processing depth of 17.4 μm can be obtained (FIG. , a processing result with a processing depth of 38.4 μm can be obtained (FIG. 5(b)). However, a machining result of 15.2 μm in processing line width and 38.4 μm in processing depth can be obtained during one-time processing using the objective lens and micro-scanning adapter (FIG. 5(c)).

As described above, it can be seen that the processing result of processing the silica surface once using the micro-scanning adapter and the processing result of 24 repetitions of processing using the objective lens are the same. Therefore, according to the present invention, a fine grid having a desired processing depth can be manufactured in a short time by controlling the number of processing repetitions using the micro-scanning technology using an objective lens and a micro-scanning adapter, and periodic or several cycles by controlling the processing line width It is possible to fabricate a fine lattice of

6 is a flowchart illustrating a method for high-speed manufacturing of an optical fiber Bragg grating using a laser micro-scanning technique according to an embodiment of the present invention, and FIG. 7 is a view showing the manufacturing result of the optical fiber Bragg grating according to FIG. 6 .

Referring to FIG. 6 , in the high-speed manufacturing method of a fiber Bragg grating using laser micro-scanning technology, when a laser beam is irradiated from the light source 110 ( S1 ), the scanner 120 adjusts the direction of the laser beam irradiated from the light source. to scan (S2). At this time, the scanner 120 finely adjusts the reflection angle according to the control of the controller to adjust the position where the laser beam reflected in a preset direction is incident on the micro-scanning adapter 130 .

The micro-scanning adapter 130 changes the nature and path of the laser beam reflected from the scanner 120 to inject the laser beam into the opening of the objective lens 140 (S3). The objective lens 140 focuses the laser beam incident through the micro-scanning adapter 130 and irradiates it to the optical fiber 160 (S4). At this time, since the stage 150 is precisely position-controlled by the control unit and moved in the preset processing direction at a constant moving speed, the laser beam irradiated through the objective lens 140 is constant even in a state where the optical fiber is not removed. Through pattern processing having a processing line width and processing depth at intervals, a fine lattice is created inside the optical fiber, so that an optical fiber Bragg lattice can be manufactured (S5).

=1516nm)에서 광 손실이 4.3dB임을 알 수 있다. As shown in FIG. 7 , the wavelength of light reflected from the FBG can be analyzed by measuring the value of the FBG using an FBG interrogator.

=1516nm), it can be seen that the optical loss is 4.3dB.

As described above, the present invention is not a method of manufacturing FBG using a change in material components contained in an optical fiber, but a laser scanning processing method to which an objective lens is applied so that the processing line width of the laser beam is maintained within 1 μm. In order to make the stage move at a moving speed of 100 mm/s or more, the FBG is manufactured by directly processing the fine grating inside the optical fiber. Therefore, since the present invention does not depend on the material doped in the optical fiber, it can be usefully applied to various optical fiber sensors. Since the FBG is not used, the manufacturing cost of FBG can be reduced, and the manufacturing time can be shortened because precise positioning of optical components is not required.

On the other hand, in the present invention, when a microwave laser is used as a light source, since the material is absorbed only in the vicinity of the laser focal point, the coating of the optical fiber is not affected, and a microgrid can be manufactured inside the optical fiber without removing the coating of the optical fiber. In particular, in the present invention, when laser processing is performed only in the laser focus area through a high speed of a laser beam through a scanner and a micro-scanning adapter, and the focal point is located inside the optical fiber, processing can be performed only inside the optical fiber. Therefore, the present invention can prevent damage and disconnection of the optical fiber due to the removal of the coating during the manufacturing of the FBG, and eliminates the need for the existing coating operation when removing the coating of the optical fiber.

On the other hand, an optical fiber manufacturing system for manufacturing an optical fiber using a laser micro-scanning technology is a laser micro-fabrication system at the end of an optical fiber manufacturing apparatus that produces an optical fiber including a core and a clad surrounding the core in a manner that melts and draws out an optical fiber base material. By positioning the high-speed manufacturing apparatus 100 for fiber Bragg gratings using scanning technology, it is possible to form a Fiber Bragg grating (FBG) inside the optical fiber.

The embodiments of the present invention described above may also be implemented in the form of a recording medium including instructions executable by a computer, such as a program module executed by a computer. Such recording media includes computer-readable media, and computer-readable media can be any available media that can be accessed by a computer, and includes both volatile and nonvolatile media, removable and non-removable media. Computer readable media also includes computer storage media, which include volatile and nonvolatile embodied in any method or technology for storage of information, such as computer readable instructions, data structures, program modules, or other data. , including both removable and non-removable media.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: High-speed manufacturing apparatus of optical fiber Bragg grating using laser micro-scanning technology
110: light source
120: scanner
125: connection
130: micro scanning adapter
140: objective lens
150: stage
160: optical fiber
170: lighting unit
180: camera unit

Claims (10)

a light source for irradiating a laser beam for processing;
a scanner that reflects the laser beam irradiated from the light source in a preset direction to scan a preset area;
an objective lens for focusing the laser beam incident through the scanner and irradiating it to a processing position of the optical fiber;
a scanning adapter for injecting the laser beam reflected from the scanner into the opening of the objective lens; and
A high-speed manufacturing apparatus for an optical fiber Bragg grating using laser micro-scanning technology, comprising a stage for seating and moving the optical fiber at a predetermined moving speed and moving direction. According to claim 1,
The scanning adapter,
High-speed manufacturing of an optical fiber Bragg grating using laser micro-scanning technology, characterized in that it comprises a first lens disposed on the light path of the light source and the scanner to focus the laser beam irradiated from the light source and incident to the scanner Device. According to claim 1,
The scanning adapter,
A high-speed manufacturing apparatus for an optical fiber Bragg grating using laser micro-scanning technology, characterized in that it comprises a second lens that converts the laser beam reflected from the scanner into parallel light. According to claim 1,
The scanning adapter,
and a third lens for changing the optical path of the laser beam reflected from the scanner in the direction of the opening of the objective lens. According to claim 1,
The optical fiber is moved to the processing position through the position control of the stage, the pattern processing is performed with a predetermined processing line width and processing depth inside the optical fiber, and the pattern processing is repeated more than a predetermined number of times to obtain a fine grid. High-speed manufacturing apparatus of an optical fiber Bragg grating using laser micro-scanning technology, characterized in that it comprises a control unit for controlling the operation of each component so that the generated. According to claim 1,
High-speed manufacturing apparatus for fiber Bragg grating using laser micro-scanning technology, characterized in that the processing speed of the fiber Bragg grating is adjusted using the scanning speed of the scanner According to claim 1,
A high-speed manufacturing apparatus for an optical fiber Bragg grating using a laser micro-scanning technology, characterized in that by adjusting the line width of the laser beam using the objective lens, pattern processing is performed with a preset processing line width and processing depth inside the optical fiber. In the high-speed manufacturing method of an optical fiber Bragg grating using a laser micro-scanning technology for manufacturing a fiber Bragg grating using an objective lens,
a) when a laser beam for processing is irradiated, reflecting the irradiated laser beam in a preset direction to perform a scanning process of scanning a preset area;
b) changing the path of the laser beam to be incident into the opening of the objective lens through a scanning adapter that converts the laser beam reflected through the scanning process into parallel light;
c) focusing the laser beam incident through the scanning adapter by an objective lens and irradiating it with an optical fiber placed on a stage; and
d) manufacturing a fiber Bragg grating by repeating processing a pattern having a predetermined processing line width and processing depth a predetermined number of times according to the processing direction of the stage to generate a fine grid. A method for high-speed fabrication of optical fiber Bragg gratings using micro-scanning technology. 9. The method of claim 8,
Step b) is,
Setting a focus at a processing position for creating a fine grating inside the optical fiber, and changing the property and path of the laser beam using at least one lens so that the laser beam is focused on the set focus area A method for high-speed fabrication of fiber-optic Bragg gratings using laser micro-scanning technology. In the optical fiber manufacturing system for manufacturing an optical fiber using laser micro-scanning technology,
An optical fiber manufacturing apparatus for manufacturing an optical fiber including a core and a clad surrounding the core by melting and withdrawing the optical fiber base material; and
High-speed manufacturing of an optical fiber Bragg grating using the laser micro-scanning technology of any one of claims 1 to 7, which is installed at the end of the optical fiber manufacturing device to form a Fiber Bragg grating (FBG) on the optical fiber Device;
An optical fiber manufacturing system comprising a.

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