JP2006078956A - Method and apparatus for manufacturing optical fiber grating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber grating manufacturing method and apparatus that are simple and sure without requiring vibration measures or the like. <P>SOLUTION: An optical fiber is coated in its circumference with a thermoplastic ultraviolet ray transmitting resin (S110); the thermoplastic ultraviolet ray transmitting resin coating is heated and softened (S120); and a phase modulation pattern mold carved with a phase modulation pattern is pressed against the resin coating (S130) to transfer the phase modulation pattern. Then, a grating is written in the optical fiber by irradiating it with a laser beam through the phase modulation pattern so transferred (S160). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical fiber grating manufacturing method and an optical fiber grating manufacturing apparatus that are suitable for manufacturing optical fiber gratings used in the fields of optical information communication, optical measurement, and the like.

  Conventionally, as a method for manufacturing an optical fiber grating, there is known a method in which an optical fiber is irradiated with ultraviolet light through a quartz phase mask to create a periodic refractive index change in the optical fiber (see, for example, Patent Document 1). .

Also proposed is a method of manufacturing a grating by coating an optical fiber with an ultraviolet transmissive resin and irradiating ultraviolet light from above the coating through a quartz phase mask (see, for example, Patent Document 2 and Patent Document 3). ).
Japanese Patent No. 2929569 JP 2001-281472 A JP 2002-82234 A

  In the phase mask method in which the grating is fabricated by irradiating ultraviolet light through a quartz phase mask, the contrast of the periodic refractive index change becomes worse if the position of the phase mask and the optical fiber shifts during exposure. This causes deterioration of the grating characteristics.

  For example, in order to produce a grating that reflects in the 1550 nm band, which is most often used in optical communications, a grating with a period of about 0.5 microns is necessary, and in order to perform stable exposure, a position on the order of several tens of nanometers is required. Control is required.

  For this reason, as shown in Japanese Patent Application Laid-Open No. 2003-29057, measures such as fixing the optical fiber by a special device have been required. In addition, since the positional relationship between the phase mask and the optical fiber changes due to ambient vibrations and temperature changes, measures such as vibration suppression and temperature management are required.

  In the case of interference exposure by the phase mask method, the phase mask and the optical fiber need to be placed at a close distance of several tens of microns to several hundreds of microns, and accurate position adjustment is necessary.

  Furthermore, since the distance between the phase mask and the optical fiber is short, there is a problem that dirt and foreign matters on the surface of the optical fiber adhere to the phase mask due to laser irradiation during exposure, and the characteristics of the phase mask deteriorate. In particular, when an optical fiber is coated with an ultraviolet transmissive resin, phase mask deterioration due to the coating resin during exposure has hindered mass production.

  The present invention has been made in view of the above, and an object of the present invention is to provide a simple and reliable optical fiber grating manufacturing method and an optical fiber grating manufacturing apparatus that do not require vibration countermeasures and temperature management.

  The optical fiber grating manufacturing method of the present invention uses the optical fiber whose periphery is coated with a thermoplastic ultraviolet transparent resin, and the phase modulation pattern mold in which periodic grooves corresponding to the period of the grating are softened by heating is used. And a step of pressing the plastic ultraviolet transmissive resin, a step of removing the phase modulation pattern mold from the thermoplastic ultraviolet transmissive resin, and a step of irradiating the optical fiber with the laser through the transferred phase modulation pattern. .

  The optical fiber grating manufacturing method of the present invention is characterized by having a step of diffusing hydrogen or deuterium in the optical fiber as a step before irradiating the optical fiber with a laser.

  Further, the optical fiber grating manufacturing method of the present invention includes a step of melting and drawing an optical fiber preform and feeding the optical fiber, a step of coating the periphery of the optical fiber with a thermoplastic ultraviolet transparent resin, and a period of the grating A step of pressing the phase modulation pattern mold in which periodic grooves corresponding to the above are softened by heating, the process of removing the phase modulation pattern mold, and the light passing through the transferred phase modulation pattern And a step of irradiating the fiber with the laser.

  Further, the optical fiber grating manufacturing apparatus of the present invention includes an optical fiber delivery unit that sends out an optical fiber coated with a thermoplastic ultraviolet ray transmitting resin, and the thermoplastic ultraviolet ray that coats the optical fiber delivered from the optical fiber delivery unit. A heating unit that heats and softens the transparent resin, and a phase modulation pattern mold in which a periodic groove corresponding to the period of the grating is pressed against the thermoplastic ultraviolet transparent resin that has been softened, and the thermoplastic ultraviolet transparent resin in the longitudinal direction An embossing part for transferring a phase modulation pattern to the optical fiber, a laser generating part for generating a laser for irradiating the optical fiber, and an optical fiber winding part for winding up the optical fiber on which a grating is formed by the laser irradiation. It is characterized by doing.

  In addition, the optical fiber grating manufacturing apparatus of the present invention includes a furnace core tube that melts and draws an optical fiber preform, and sends the optical fiber, a furnace tube heating part that heats the furnace core tube, and a thermoplastic material around the optical fiber. A phase modulation pattern consisting of a thermoplastic UV transparent resin tank for coating the UV transparent resin, a heating part for heating and softening the cured thermoplastic UV transparent resin, and a periodic groove corresponding to the period of the grating is provided. Cylindrical pattern roller engraved on the surface, and a cylindrical shape having a peripheral surface facing in parallel with the peripheral surface of the pattern roller, and pressurizing the phase-modulation pattern onto the softened thermoplastic ultraviolet transparent resin A pressure roller, a laser generating unit for generating a laser for irradiating the optical fiber, and an optical fiber on which a grating is formed by the laser irradiation. Characterized by comprising an optical fiber take-up unit for taking up the driver.

  According to the method for producing an optical fiber grating of the present invention, a phase modulation pattern is transferred to a thermoplastic ultraviolet transparent resin covering the periphery of the optical fiber, and a laser is irradiated to the optical fiber through the transferred phase modulation pattern. In addition, an optical fiber grating can be manufactured easily and reliably without performing temperature control and the like.

  Further, according to the optical fiber grating manufacturing apparatus of the present invention, since the phase modulation pattern is transferred to the thermoplastic ultraviolet transmitting resin covering the periphery of the optical fiber, even if the optical fiber moves or vibrates during the exposure. The interference pattern in the optical fiber does not shift, and an optical fiber grating can be manufactured easily and reliably without taking measures against vibration and temperature control.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Example 1
Example 1 of the optical fiber grating manufacturing method of the present invention will be described with reference to the flowchart shown in FIG. 1 and FIG.

  First, in step S110, as shown in FIG. 2A, the periphery of the optical fiber 1 is coated (coated) with a thermoplastic ultraviolet transmitting resin 11 made of, for example, a fluorine-based resin.

  Here, as a coating method, a part of the optical fiber coated with a normal ultraviolet curable resin is removed and a thermoplastic ultraviolet transmitting resin is coated on the part (recoating method), and the optical fiber is a base material. There is a method of coating when drawing from.

  The method of coating at the time of drawing from the base material has an advantage that the breaking strength of the optical fiber is hardly deteriorated because it is not necessary to remove the coating at the time of exposure. Further, since the coating removal process and the recoating process are not required, man-hours can be reduced, and an inexpensive optical fiber grating can be manufactured.

  On the other hand, the recoating method has an advantage that a normal optical fiber can be used because only a part of the thermoplastic ultraviolet transmitting resin is used.

  Next, in step S120, as shown in FIGS. 2B, 2C, and 2D, the coated portion is heated to a temperature at which the coated thermoplastic ultraviolet transmitting resin 11 is softened. Here, the temperature needs to be not less than the softening temperature and not more than the decomposition temperature (about 100 ° C. to 200 ° C.) of the thermoplastic ultraviolet transparent resin 11. Heating is performed by placing the softened heating portion 14 of the optical fiber 1 on the V groove of the heater 2 having a V groove. The softened state refers to a state that is soft enough to transfer the phase modulation pattern in the next step.

  Next, in step S130, as shown in FIGS. 2C and 2D, the phase modulation pattern mold 3 is pressed against the softened heating portion. As the phase modulation pattern mold 3, a conventional quartz phase mask can be diverted, but unlike ordinary exposure, it is not necessary to transmit ultraviolet light unlike quartz, so a material other than quartz (for example, silicon) is used. May be used.

  Next, in step S140 and step S150, as shown in FIG. 2E, the softening heating portion 14 is cooled to the curing temperature as necessary, and the phase modulation pattern mold 3 is removed. This is because if the phase modulation pattern mold 3 is removed while the thermoplastic ultraviolet transmissive resin 11 is too soft at a high temperature, the resin remains in the grooves of the phase modulation pattern mold 3 and the phase modulation pattern cannot be transferred.

  Next, in step S160, the optical fiber 1 is irradiated with the ultraviolet laser 4 through the transferred phase modulation pattern portion 15, as shown in FIG. The ultraviolet light laser 4 is irradiated from the side on which the phase modulation pattern is engraved. As the laser, an excimer laser, a second harmonic of an argon laser, a second harmonic of a copper vapor laser, a fourth harmonic of a YAG laser, or the like can be used.

  The ultraviolet light laser 4 that has passed through the phase modulation pattern unit 15 is diffracted and separated into ± first-order light 5. However, as shown in FIG. 2G, interference fringes occur where the ± first-order light 5 overlaps. This creates a periodic pattern of ultraviolet light. Then, the refractive index of the core 12 of the optical fiber 1 periodically rises corresponding to the intensity distribution of the ultraviolet laser 4, and the grating 16 is completed in the core 12 of the optical fiber 1 as shown in FIG. To do.

  The optical fiber 1 to be used is only required to be sensitive to ultraviolet light, but it is desirable that the optical sensitivity is high. For example, before step S110, between step S110 and step S120, between step S150 and step S160. By introducing a process of performing hydrogen treatment for diffusing hydrogen or deuterium into the optical fiber 1 at a stage before exposure, such as a gap, the characteristics of the optical fiber 1 can be improved.

When the wavelength λ of the ultraviolet laser 4 used for exposure and the refractive index n of the thermoplastic ultraviolet transmitting resin 11 are used, the groove depth d after the phase modulation pattern transfer shown in FIG.
d = λ / (2 (n−1)) (Formula 1)
When the phase modulation pattern mold 3 that satisfies the above is used, the diffraction efficiency of the zero-order light 6 shown in FIG. 2G can be reduced. Decreasing the zero-order light 6 is desirable because the ± first-order light 5 becomes strong and the grating 16 can be produced efficiently. However, even if the zero-order light 6 is present, the grating 16 can be manufactured if the ± first-order light 5 is present, and therefore this condition does not necessarily have to be satisfied.

  According to the present embodiment, since the optical fiber 1 and the phase modulation pattern portion 15 are integrated, it is not necessary to use a phase mask at the time of exposure, and it is not affected by ambient vibrations or temperature changes. There is no need for temperature control. Further, it is not necessary to control the distance between the phase mask and the optical fiber.

  Further, since it is not necessary to remove the coating during exposure, there is no deterioration in the strength of the optical fiber.

(Example 2)
Next, Embodiment 2 of the optical fiber grating manufacturing method of the present invention will be described based on the flowchart shown in FIG.

  In this example, the recoat method was adopted. First, in step S310, a coating of a single mode optical fiber (manufactured by Fujikura: trade name Guide Guide (registered trademark) -SM) was removed by 5 cm, and an ultraviolet light transmitting fluororesin was coated on the coating removal portion. As a coating method, coating was performed by a dice method using a solution obtained by dissolving an ultraviolet light transmitting fluororesin in a solvent. Thereafter, the recoat portion was heated at 200 ° C. for 10 minutes in order to completely evaporate the solvent and cure the fluororesin. The outer diameter of the recoat portion was 160 μm.

  The used ultraviolet light transmission type fluororesin has a tensile modulus of 1000 MPa and a resin decomposition temperature of 390 ° C.

  Next, in step S320, the portion coated in step S310 was heated to 120 ° C. to soften the ultraviolet light transmissive fluororesin. An electric heater was used for heating.

  Next, in step S330, the phase modulation pattern mold was pressed against the coating portion heated and softened in step S320. A quartz phase mask was used as the phase modulation pattern type. This phase mask is a mask in which a phase modulation pattern having a period of 1.06 μm and a groove depth of 270 nm is engraved over a length of 30 mm.

  Thereafter, in step S340, the process waited until the coating portion decreased to the curing temperature, and in step S350, the phase modulation pattern mold was removed. Since the heated portion was thin with an outer diameter of 160 μm and the heat capacity was small, the temperature decreased to room temperature in about 5 seconds. Since the fracture elongation of the used fluororesin was 140% or more and the breaking strength was as high as 20 MPa, the resin was broken and the phase pattern was transferred to the resin portion without remaining in the phase mask groove.

Thereafter, in step S360, the second harmonic (wavelength 244 nm) of an argon ion laser is irradiated from the phase modulation pattern transfer side of the optical fiber coating portion, and a grating is written in the optical fiber by diffraction by the phase modulation pattern on the coating surface. . The power density at the irradiated portion of the laser used was 200 mW / mm ² , and a laser spot having a diameter of about 0.5 mm was moved over the phase modulation pattern transfer portion 30 mm to obtain a grating having a length of 30 mm. As a result, a grating having a reflectance of 0.1% and a center wavelength of 1543 nm was successfully produced.

(Example 3)
Next, Example 3 of the optical fiber grating manufacturing method of the present invention will be described based on the flowchart shown in FIG.

  First, in step S410, a single-mode optical fiber (manufactured by Fujikura: trade name Future Guide (registered trademark) -SM) is left in a hydrogen atmosphere at 55 ° C. and 30 MPa for 5 days to sufficiently diffuse hydrogen to the optical fiber core. I let you.

  Thereafter, in steps S420 to S470, processing similar to that in steps S310 to S360 of Example 2 was performed to form a grating.

  Thereafter, in step S480, the optical fiber including the coated portion is heated at 120 ° C. for 12 hours, and the hydrogen diffused in the optical fiber in step S410 is re-diffused into the atmosphere, thereby reducing the hydrogen concentration in the optical fiber. . As a result, a grating having a reflectance of 99% and a center wavelength of 1545 nm was successfully produced.

Example 4
Next, Embodiment 4 of the optical fiber grating manufacturing method of the present invention will be described based on the flowchart shown in FIG. 5 and FIG.

  First, in step S510, the optical fiber was coated with an ultraviolet transmissive fluororesin as a coating layer when forming the optical fiber preform into a fiber by drawing.

  Here, the drawing method will be described with reference to the drawing device shown in FIG. The optical fiber preform 71 is gradually fed into the core tube 72 at a constant speed, and the optical fiber 79 obtained by heating and melting the tip is cooled and solidified by the cooling unit 74, and a thermoplastic ultraviolet transparent resin tank In order to coat the surface with a fluororesin at 75 and completely evaporate and harden the solvent, the heating unit 76 was heated at 300 ° C. for 10 seconds during drawing. The cured optical fiber 79 was taken up by a take-up bobbin 78 through a take-up machine 77. The outer diameter of the recoat portion of the optical fiber 79 was 180 μm.

  The refractive index distribution and additives of the optical fiber are equivalent to those of a single mode optical fiber (manufactured by Fujikura: trade name Guide Guide (registered trademark) -SM). The tensile elastic modulus of the used fluororesin is 1000 MPa, and the resin decomposition temperature is 390. ° C.

  Next, in step S520, the optical fiber manufactured in step S510 was left in a hydrogen atmosphere at 55 ° C. and 30 MPa for 5 days to sufficiently diffuse hydrogen to the optical fiber core portion.

  Thereafter, in steps S530 to S580, processing similar to that in steps S430 to S480 of Example 3 was performed. As a result, a grating having a reflectance of 99% and a center wavelength of 1545 nm was successfully produced.

(Example 5)
Next, Example 5 of the optical fiber grating manufacturing apparatus of the present invention will be described with reference to FIG.

  FIG. 7 shows the configuration of Embodiment 5 of the optical fiber grating manufacturing apparatus of the present invention. An optical fiber delivery unit 82 for feeding out an optical fiber 81 coated with a thermoplastic ultraviolet transmitting resin by rotating a drum, and a V-groove. , A phase modulation pattern mold 84 in which periodic grooves corresponding to the period of the grating written to the optical fiber 81 are engraved, a laser generator 85 for generating a laser, and the laser generator 85 And a mirror 86 for reflecting the laser in a right angle direction, and an optical fiber winding portion 88 for winding the optical fiber 81 on which the grating is written by the laser irradiation by rotating the drum.

  Here, the basic operation of the optical fiber grating manufacturing apparatus of the present embodiment will be described. The optical fiber delivery unit 82 sends out the optical fiber 81 covered with the thermoplastic ultraviolet ray transmitting resin from the drum. The heater 83 places the optical fiber 81 in the V-groove, and heats the coated portion to a temperature at which the thermoplastic ultraviolet transmitting resin covering the optical fiber 81 is softened.

  Further, the phase modulation pattern mold 84 is pressed against the softened heated portion to transfer the phase modulation pattern to the thermoplastic ultraviolet ray transmitting resin.

  On the other hand, the laser generator 85 generates a laser toward the mirror 86. The mirror 86 reflects the laser in a right angle direction and irradiates the portion of the optical fiber 81 where the grating is written with the laser.

  The optical fiber winding unit 88 winds the optical fiber 81 on which the grating is written by being irradiated with a laser onto a drum.

  According to the present embodiment, since the phase modulation pattern is transferred to the thermoplastic ultraviolet transparent resin covering the periphery of the optical fiber 81, even if the optical fiber 81 moves or vibrates during the exposure, the interference pattern in the optical fiber. The optical fiber grating can be easily and reliably manufactured without causing a shift and without taking measures against vibration and temperature control.

  Further, since the exposure can be performed while moving the optical fiber 81, continuous flow exposure is possible, and the efficiency of the optical fiber grating manufacturing operation can be improved.

(Example 6)
Next, Embodiment 6 of the optical fiber grating manufacturing apparatus and manufacturing method of the present invention will be described with reference to FIGS.

  FIG. 8 shows the configuration of Embodiment 6 of the optical fiber grating manufacturing apparatus of the present invention. A core tube 93 that melts and draws the optical fiber preform 91 and feeds the optical fiber 92, and a core that heats the core tube 93 are shown. A tube heating unit 94, a cooling unit 95 that cools the drawn optical fiber 92, a thermoplastic UV transmitting resin tank 96 that coats the periphery of the optical fiber 92 with a thermoplastic UV transmitting resin, and the periphery of the optical fiber 92 A first heating unit 97 that heats and cures the thermoplastic ultraviolet transmitting resin to be coated, a second heating unit 98 that heats and softens the cured thermoplastic ultraviolet transmitting resin, and a grating that writes to the optical fiber 92 A cylindrical pattern roller 99 in which a phase modulation pattern composed of periodic grooves corresponding to the period of the pattern is engraved on the peripheral surface, and parallel to the peripheral surface of the pattern roller 99 A cylindrical pressure roller 100 having opposing circumferential surfaces and pressurizing the phase-modulation pattern onto the soft thermoplastic ultraviolet transparent resin, a laser generator 101 for generating a laser, and a laser generator 101 A mirror 102 that reflects the laser beam emitted from the optical fiber in a right angle direction, a take-up machine 104 that takes up the optical fiber 92, and an optical fiber winding unit 105 that winds the optical fiber 92 by rotating a drum.

  Here, an optical fiber grating manufacturing method by the optical fiber grating manufacturing apparatus of the present embodiment will be described based on the configuration diagram shown in FIG. 8 and the flowchart shown in FIG.

  First, in step S <b> 910, the core tube 93 heated by the core tube heating unit 94 melts and draws the optical fiber preform 91 and sends out the optical fiber 92. The cooling unit 95 cools and solidifies the drawn optical fiber 92.

  Next, in step S920, the thermoplastic ultraviolet transmissive resin tank 96 coats the periphery of the optical fiber 92 with the thermoplastic ultraviolet transmissive resin, and the first heating unit 97 heats the thermoplastic ultraviolet transmissive resin to completely remove the solvent. Volatilize to cure. Thereafter, in step S930, the second heating unit 98 further heats and softens the thermoplastic ultraviolet transparent resin.

  Thereafter, in step S940, the optical fiber 92 passes through the gap between the peripheral surface of the pattern roller 99 and the peripheral surface of the pressure roller 100, and the optical fiber 92 is pressed against the phase modulation pattern carved on the peripheral surface of the pattern roller 99. As a result, the phase modulation pattern is transferred to the softened thermoplastic ultraviolet transparent resin.

  In step S950, the laser generating unit 101 generates a laser, and the mirror 102 reflects the laser in a right angle direction and irradiates the portion of the optical fiber 92 where the grating is written.

  Then, the optical fiber 92 on which the grating is written by being irradiated with the laser is wound around the drum of the optical fiber winding unit 105 through the take-up machine 104.

  According to the present embodiment, the drawing of the optical fiber 92 and the formation of the grating can be performed with one apparatus, so that the efficiency of the optical fiber grating manufacturing work can be improved.

It is a flowchart which shows the preparation procedure in Example 1 of the optical fiber grating preparation method of this invention. It is the schematic explaining the preparation procedure in Example 1 of the optical fiber grating preparation method of this invention. It is a flowchart which shows the preparation procedure in Example 2 of the optical fiber grating preparation method of this invention. It is a flowchart which shows the preparation procedure in Example 3 of the optical fiber grating preparation method of this invention. It is a flowchart which shows the preparation procedure in Example 4 of the optical fiber grating preparation method of this invention. It is the schematic which shows the structure of the drawing apparatus used in Example 4 of the optical fiber grating manufacturing method of this invention. It is the schematic which shows the structure of Example 5 of the optical fiber grating production apparatus of this invention. It is the schematic which shows the structure of Example 6 of the optical fiber grating production apparatus of this invention. It is a flowchart which shows the optical fiber grating preparation procedure by the optical fiber grating preparation apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,79,81,92 Optical fiber 11 Thermoplastic ultraviolet transparent resin 12 Core 13 Cladding 14 Softening heating part 15 Phase modulation pattern part 16 Grating 2, 83 Heater 3, 84 Phase modulation pattern type 4 Ultraviolet light laser 5 ± primary light 6 0th order light 71, 91 Optical fiber preform 72, 93 Core tube 73, 94 Core tube heating unit 74, 95 Cooling unit 75, 96 Thermoplastic UV transparent resin tank 76 Heating unit 77, 104 Take-up machine 78 Winding bobbin 82 Optical fiber delivery unit 85, 101 Laser generation unit 86, 102 Mirror 88, 105 Optical fiber winding unit 97 First heating unit 98 Second heating unit 99 Pattern roller 100 Pressure roller

Claims (5)

Using an optical fiber whose periphery is coated with a thermoplastic ultraviolet transparent resin, a process of pressing the phase modulation pattern mold in which a periodic groove corresponding to the period of the grating is engraved against the thermoplastic ultraviolet transparent resin softened by heating,
Removing the phase modulation pattern mold from the thermoplastic ultraviolet transparent resin;
And a step of irradiating the optical fiber with a laser through the transferred phase modulation pattern.   2. The optical fiber grating manufacturing method according to claim 1, further comprising a step of diffusing hydrogen or deuterium in the optical fiber as a step before irradiating the optical fiber with a laser. A process of melting and drawing the optical fiber preform and feeding the optical fiber;
A process of coating a thermoplastic ultraviolet transparent resin around the optical fiber;
A step of pressing a phase modulation pattern mold in which a periodic groove corresponding to the period of the grating is engraved against the thermoplastic ultraviolet transparent resin softened by heating;
Removing the phase modulation pattern mold;
And a step of irradiating the optical fiber with a laser through the transferred phase modulation pattern. An optical fiber delivery section for delivering an optical fiber coated with a thermoplastic ultraviolet transparent resin;
A heating unit that heats and softens the thermoplastic ultraviolet transmitting resin that covers the optical fiber delivered from the optical fiber delivery unit;
A mold pressing portion for pressing the phase modulation pattern mold in which periodic grooves corresponding to the period of the grating are softened against the thermoplastic ultraviolet transparent resin softened and transferring the phase modulation pattern to the thermoplastic ultraviolet transparent resin in the longitudinal direction;
A laser generator for generating a laser for irradiating the optical fiber;
An optical fiber grating manufacturing apparatus comprising: an optical fiber winding unit that winds an optical fiber on which a grating is formed by laser irradiation. A furnace tube that melts and draws the optical fiber preform and delivers the optical fiber;
A core tube heating section for heating the core tube,
A thermoplastic ultraviolet transmissive resin tank for coating the periphery of the optical fiber with a thermoplastic ultraviolet transmissive resin;
A heating section for heating and softening the cured thermoplastic ultraviolet transparent resin;
A cylindrical pattern roller in which a phase modulation pattern composed of periodic grooves corresponding to the period of the grating is engraved on the peripheral surface;
A cylindrical pressure roller that has a peripheral surface that faces the peripheral surface of the pattern roller in parallel and pressurizes the softened thermoplastic ultraviolet transmitting resin so as to transfer a phase modulation pattern;
A laser generator for generating a laser for irradiating the optical fiber;
An optical fiber grating manufacturing apparatus comprising: an optical fiber winding unit that winds an optical fiber on which a grating is formed by laser irradiation.

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