KR20060048180A - Fabrication method for all fiber type optical element using laser micro-machining - Google Patents

Abstract

According to the present invention, a laser ablation is performed directly on a partial coating of an optical fiber to expose a dissipation field in the optical fiber. Type) device is provided. The working length of the dissipation field formed by laser ablation can be controlled by changing the bending radius of the optical fiber. After the ablation, the optical fibers are joined to each other, and the optical fiber coupler, the optical fiber add drop multiplexer, the Mach-Zehnder filter, Optical fiber elements, such as optical fiber fringe, can be manufactured.

Laser micromachining, all-optical fiber, add-drop multiplexer, optical color dispersion

Description

FABRICATION METHOD FOR ALL FIBER TYPE OPTICAL ELEMENT USING LASER MICRO-MACHINING}

1A and 1B illustrate a manufacturing method of a conventional side polished optical fiber coupler;

2 is a structural diagram of an optical fiber coupler according to an embodiment of the present invention;

3A and 3B are structural diagrams of an optical fiber coupler according to another embodiment of the present invention;

3c is a structural diagram of an optical fiber coupler having an optical fiber fringe effect according to the present invention;

Figure 4a and 4b is an illustration showing another manufacturing method of the all-optical fiber device by the laser micromachining process of the present invention,

5a is a photograph of an optical fiber ablation cross section produced using the laser microfabrication processing method of the present invention;

5b is a photograph of a laser ablation center zone,

5C is a photograph of a laser ablation edge zone,

6a and 6b is an exemplary view applying the manufacturing method of the all-optical fiber type device by the laser micromachining of the present invention,

7 is an exemplary diagram of a 2x2 optical fiber coupler and a 4x4 optical fiber coupler fabricated using the laser ablation method of the present invention;

8 is an exemplary diagram of an NxN optical fiber coupler fabricated using the laser ablation method of the present invention;

9A is an exemplary diagram of an optical fiber add drop multiplexer fabricated using the laser ablation method of the present invention.

9B is an exemplary diagram of an optical fiber add drop multiplexer fabricated using the laser ablation method of the present invention.

10 is an illustration of an adjustable optical fiber add drop multiplexer fabricated using the laser ablation method of the present invention.

11A and 11B are illustrations of optical fiber fringes produced using the laser ablation method of the present invention.

12 is an illustration of another type of optical fiber add drop multiplexer fabricated using the laser ablation method of the present invention.

<Explanation of symbols for the main parts of the drawings>

11, 21, 22, 41, 52, 61, 62, 73: optical fiber

12: quartz substrate

13, 30, 31, 32, 33, 70, 80, 81: fiber coupler

211, 221, 241, 412: fiber core

212, 222, 242, 411: covering part

23, 53: fusion zone

24, 63: coupling zone

413: ablation

414, 74: dissipation field exposed surface

415 radius of curvature

42: first laser

43: reflector

44, 46: convex lens

45: second laser

47: screen

48: third laser

49: photodetector

71, 72: optical fiber element

83, 84, 87: Fiber Optic Add Drop Multiplexer

85: optical fiber fringe

90: optical color dispersion material

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all-fiber type device by a laser micromachining process and a manufacturing method thereof, and more particularly to a manufacturing method of an all-optical fiber type device manufactured by performing a micromachining process by a laser ablation method. .

The side polished fiber coupler is manufactured by Prof. Stanford University. It was first proposed by Shaw Lab.

1A and 1B illustrate a conventional method of manufacturing a side polished optical fiber coupler. As shown in Fig. 1A, an optical fiber 11 is embedded in a quartz substrate 12 and polished to a few micrometers away from the fiber core with respect to the coating portion thereof, and then the side polishing as shown in Fig. 1B. The optical fiber elements are overlapped with each other to form the optical fiber coupler 13. The loss is very low (<0.5 dB) and also has the advantage that the spectral ratio can be adjusted. However, due to the short polishing length, there is a drawback that the refractive index needs to be matched with the liquid and the manufacturing cost is high. For this reason, the optical fiber coupler of the above type has low environmental stability and commercial value. Many companies around the world produce this type of fiber coupler, but all use the same type of adjustable fiber coupler as polarized fiber.

Such an example is described in R.A. Burgh, G. Kotler, and H.J. Shaw, Single-mode fiber optic directional coupler, Electron. Lett., Vol. 16, pp. 260-261, 1980, and Michel Digonnet, and H.j. Shaw, Wavelength multiplexing in single-mode fiber couplers, Appl. Opt. vol. 22, pp. 484-491, 1983.

The method of fabricating a fused fiber coupler using a flame was first proposed by Kawasaki, which is already the mainstream manufacturing technology of the fiber coupler because the manufacturing method is simple and quick. The manufacturing method of fusion using a flame is very simple, and it is also possible to manufacture various other optical fiber elements, such as an optical fiber polarizer, a polarizer, a wavelength multiplexer / demultiplexer, a filter, and the like. However, this method does not produce more advanced fiber because of the fatal flaw. In other words, the two optical fibers have an asymmetrical cross-section of the optical fiber coupler during the fusion tension, so that the light in the same polarization mode has different coupling coefficients. It becomes very large and results in a condition in which a certain length of non-identical polarized light is forever simultaneously present. In this case, channel isolation of the optical fiber becomes very poor. However, since the channel spacing is also determined by the long and short length of the coupler's working length, it is not very easy to fabricate a fiber coupler with narrow channel spacing and high channel isolation using this method. In addition, the combustion of the flame generates a large amount of water vapor, which infiltrates into the optical fiber when the optical fiber is tensioned, causing optical loss near the 1.38 占 퐉 wavelength. For this reason, the method is not suitable for the production of low density wavelength division multiplexing (CWDM) optical fiber devices.

Regarding the fabrication of a fusion type optical fiber coupler using the flame as described above, B.S. Kawasaki, K.O. Hill, and R.G. Lamont, Biconical-taper single-mode fiber coupler, Opt. Lett., Vol. 6, pp. 327-328, 1981, and Michael Eisenmann, and Edgar weidel, Single-mode fused biconical couplers for wavelength division multiplexing with channel spacing between 100 and 300 nm, J. Lightwave Technol., Vol. 6, pp. 113-119, 1988, and Katsumi Morishita, and Katsuyoshi Takashina, Polarization properties of fused fiber couplers and polarizing beam splitters, J. Lightwave Technol., Vol. 9, pp. 1503-1507, 1991, and T.L. Wu, and H.C. Chang, Rigorous analysis of form birefringence of fused fiber couplers, Electron. Lett., Vol. 30, pp. 998-999, 1994.

Because side polished and fused types have their own advantages and drawbacks, C.V.Cryan fused the side polished fiber elements to improve the stability of the side polished fiber coupler. However, the optical fiber polishing technique developed by them is to grind the optical fiber by using grinding grindstone, and when the optical fiber is fused, it is added by the sol-gel process to add the liquid liquid silicon dioxide. The polishing interface must be replenished. Although this method improves the stability of the side polished optical fiber, the fabrication method is not good, and since they do not present a method of fabricating the optical taper, it is impossible to adjust the spectral ratio and the wavelength selection characteristic and is not practical.

An example like this is C.V. Cryan, and C.D. Hussey, Fused-polished singlemode fiber couplers, Electron. Lett., Vol. 28, pp. 204-205, 1992, and C.V. Cryan, J.M. Lonergan, and C.D. Hussey, Overcoming the effects of polishing induced stress when fabricating fused polished couplers, Electron. Lett., Vol. 29, pp. 1243-1244, 1993.

Taiwan Patent Publication No. 493090 (a microfiber coupler and its manufacturing method) simultaneously fuses two side polished optical fibers by using the above side polishing and fusion technology and combines them into one, and then adds fine-tuning tensile motion. The required spectral ratio was obtained by adjusting the phase relationship of the two feature modes. In the fabrication of this kind of coupler, the purpose of the tensioning operation of the optical fiber is merely to fine tune the phase difference between the two feature modes of the optical fiber coupling section, so that the output light is output from the same terminal. Therefore, the fiber core of the optical fiber is not destroyed during the stretching process. As a result, the first and second fiber core structures exist in the optical fiber coupler portion, and the conduction of the optical signal basically performs a guiding effect by using the fiber core. However, the fabrication process of the side polish element of the optical fiber takes too long. In addition, it is of low industrial value because of the need to use large amounts of abrasive and highly accurate silicon chip slits.

U.S. Patent No. 511090 (Methods and apparatus for making optical fiber couplers) uses a semi-molecular laser to ablate a partial coating of the optical fiber to the inclined portion of the fiber core and then stop to form a notch of one strand. The technique which makes it is disclosed. When a separate signal laser light is incident on the optical fiber notch in the oblique direction, the stop point is determined, and at the same time, the amount of signal light energy entering the optical fiber terminal is measured by a photodetector, and once the energy exceeds the threshold, ablation operation of the laser light is performed. Notify to stop. This structure is used simultaneously in the fabrication of optical fiber couplers. However, because the laser light ablates the optical fiber to form a notch, and the thickness of the coating part is suddenly changed, the size of the optical mold field is suddenly changed to cause the coupling shape of the advanced mode, causing serious light loss. Moreover, the thickness of the remaining cladding cannot be taken into account because the laser ablation depth is determined only by the magnitude of the incident energy of the signal laser light. In addition, when such a structure is used as the optical fiber coupler, the coupling constant of the optical fiber coupler is not high because the transmission constant of the signal laser light and the transmission constant of the fiber core transmission light do not coincide. In this citation example, the coating part used for ablation of the quasi-molecular laser is a high molecular polymer material and is different from the coating part of quartz glass fiber which is generally known, and the quasi-molecular laser is used to avoid photosensitive phenomenon to the fiber core. It should not be used for photosensitive fibers.

Accordingly, the present applicant, in view of the drawbacks of the prior art, has been intensively tested and studied, and has submitted the following "method of fabricating an all-optical fiber device by laser microfabrication process" of the present invention.

The present invention has been made to solve the above problems, the present invention is to perform a laser ablation directly on the coating portion of the optical fiber to expose the dissipation field of the optical fiber, the cutting depth of the coating portion is a separate laser light interference pattern It is an object of the present invention to provide a method for fabricating an all-optical fiber device by laser micromachining processing, which is calculated at intervals.

In laser ablation, the optical fiber may slowly change the depth of the cladding to be excised and must remain curved to avoid the occurrence of optical consumption. The ablation length of the optical fiber is controlled by changing the radius of curvature of the optical fiber. In addition, if ablation is performed on an optical fiber in which the laser light is not curved, a coating portion after ablation is formed in a shape in which the radiance gradually changes so as to avoid the optical consumption by programming a moving route of the light beam. do. By using the dissipation field type side-removing optical fiber element, the main passive element of the optical fiber such as dissipation field type optical fiber coupler, optical fiber add drop multiplexer, optical fiber filter, optical polarizer, optical amplifier, optical laser and optical fiber fringe can be manufactured.

According to one aspect of the present invention, there is provided a method of fabricating an all-optical fibrous device by laser micromachining according to the present invention, comprising the steps of: (a) providing at least one fiber having a fiber core and a coating portion; Cutting the covering portion with a laser beam to form a dissipation field exposed surface, and simultaneously injecting a second laser beam into the dissipation field exposed surface; and (c) forming an interference fringe obtained by reflecting by the second laser beam. Determining a depth at which the first laser beam is to ablate the covering portion at intervals.

The step (b) is performed by cutting the covering portion with the first laser beam and rotating the optical fiber to form a ring-shaped optical fiber dissipation field exposed surface, and the covering portion with the first laser beam. Determining the length of the first laser beam to ablate the coated portion by the radius of curvature at the time of bending the optical fiber, and the first laser beam to ablate the coated portion. Previously, the method further includes reflecting the first laser beam by at least one reflector, and moving or rotating the reflector to include the dissipation field exposure surface in the ablation range of the first laser beam.

In addition, the manufacturing method of the optical fiber coupler according to the present invention comprises the steps of (a) providing a positive fiber having a fiber core and a coating portion, respectively, (b) cutting the coating portion of the optical fiber with the first laser beam to dissipate Forming a field exposure surface and simultaneously incident the second laser beam to the dissipation field exposure surface; and (c) the first laser beam is spaced apart from an interference pattern obtained by reflecting by the second laser beam. Determining a depth to cut the cladding, (d) repeating steps (b)-(c) for another optical fiber, (e) fusing and bonding the dissipation field exposed surface of the positive fiber And forming an optical fiber coupler by stretching.

The step (b) is performed by cutting the covering portion with the first laser beam and rotating the optical fiber to form a ring-shaped optical fiber dissipation field exposed surface, and the covering portion with the first laser beam. Determining the length of the first laser beam to ablate the coated portion by the curvature radius during bending of the optical fiber, and the first laser beam to ablate the coated portion upon ablation. Prior to reflecting the first laser beam by at least one reflector and concentrating the first laser beam with at least one lens before the first laser beam ablates the covering portion. It further comprises the step of ablation.

In addition, the method of manufacturing the optical fiber add-drop multiplexer according to the present invention comprises the steps of (a) providing a positive fiber having a fiber core and a coating portion, respectively, and (b) removing the coating portion of the optical fiber with a first laser beam. Ablation to form a dissipation field exposed surface and incident a second laser beam on the dissipation field exposed surface; and (c) the first laser beam at an interval of an interference fringe reflected by the second laser beam. Determining a depth to ablate the coating portion; (d) performing steps (b) to (c) on the other optical islands in duplicate; and (e) adhesively bonding the exposed field exposed surface of the positive fiber Fusing, forming (f) an optical fiber fringe in the fiber core, and (g) constructing an optical fiber add-drop multiplexer by tensioning the optical fiber to adjust optical properties. It is characterized by losing.

The optical fiber add drop multiplexer is constituted by a plurality of optical fiber add drop multiplexers formed in series.

In addition, the method of manufacturing the adjustable fiber optic add-drop multiplexer according to the present invention comprises the steps of (a) providing a positive fiber having a fiber core and a coating portion, respectively, and (b) the coating of the optical fiber with a first laser beam. Cutting off the portion to form a dissipation field exposed surface and simultaneously entering the second laser beam on the dissipation field exposed surface; and (c) at an interval between the interference fringes obtained by reflecting by the second laser beam. 1 determine the depth at which the laser beam will ablate the cladding, and (d) repeat steps (b)-(c) for the other optical fiber and at the same time form a deeper depth of the cut off portion of the cladding. (E) bonding and fusing the dissipation field exposed surface of the positive fiber to form voids in different portions of the optical fiber, and (f) forming an optical chromatic dispersion material into the cavity. It characterized in that the filling obtained by comprising the step of configuring said tunable type optical fiber add-drop multiplexers.

The optical color dispersion material is a high molecular polymer, and / or the refractive index of the optical color dispersion material changes with temperature.

In addition, the method of fabricating an optical fiber fringe according to the present invention comprises the steps of: (a) providing at least one optical fiber having a fiber core and a coating portion, and (b) cutting the coating portion at intervals with a first laser beam. Forming a plurality of dissipation field exposed surfaces and incident a second laser beam on the dissipation field exposed surfaces; and (c) the first laser beam at intervals between the interference fringes reflected by the second laser beam. And determining the depth at which the coating portion is to be excised to construct the optical fiber fringe.

In the step (b), the optical laser fringe is vertically formed by gradually changing the depth at which the first laser beam cuts off the coating portion by the step (c).

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to the configuration and operation according to an embodiment of the present invention.

There are various other methods for manufacturing the all-optical fiber device by the laser micromachining treatment according to the present invention, which will be described below by way of example.

2 is a structural diagram of an optical fiber coupler capable of producing an all-optical fiber type device by a microfabrication process according to the present invention. Referring to the structure of the optical fiber coupler 20 of FIG. 2, the manufacturing method of the all-optical fiber type device by the microfabrication process according to the present invention will be described.

First, the optical fiber 21 and the optical fiber 22 are prepared. Among them, the optical fiber 21 is composed of a fiber core 211 and the coating portion 212, the optical fiber 22 is composed of a fiber core 221 and the coating portion 222. Then, the covering portions 212 and 222 are ablated using a laser to form two dissipation field exposed surfaces, and the covering portions 212 and 222 are exposed to the light dissipation fields of the optical fibers 21 and 22. After annealing is performed, the two dissipation field exposed surfaces are again fixed and overlapped together to form a fusion zone 23.

Then, the purge gas is evenly distributed around the fusion zone 23 and the fusion zone 23 is fused using an arc higher than 1500 ° C., thereby coupling the coupling to the optical fiber 21 and the optical fiber 22. Generate. During the coupling process, the fiber core 211 and the fiber core 221 are adjusted by gradually tensioning the optical fiber 21 and the optical fiber 22 by tension using a step motor to adjust the length of the coupling region 24. ) Is slowly tapered to form a fiber core 241. At this time, since the fiber core 241 has already lost the guiding effect, eventually the fiber cores 211 and 221 of the partial covering part 242 located in the coupling zone 24 of the covering parts 212 and 222. ) Will act as a guide effect instead.

After obtaining the predetermined spectral ratio, the length adjusting operation of the coupling region 24 is immediately stopped. Sealing is performed on the coupling region 24 using the final sealing layer (not shown) to form the optical fiber coupler 20. As the material for producing the sealing layer, a metal, ceramic, glass, a polymer material or a material having a temperature compensation action may be selected.

The manufacturing method of the present invention is not limited to two optical fibers. That is, the 6x6 optical fiber coupler 31 (see FIG. 3B) may be formed using three optical fibers in addition to the 4x4 optical fiber coupler 30 shown in FIG. 3A, or may be manufactured using a larger number of optical fibers. .

Here, it should be noted that when the ablation is performed more smoothly for two or more optical fibers by the laser ablation method, the optical fiber couplers 32 and 33 as shown in FIG. 3C may be formed, and the optical fiber coupler 31 may be formed. A fringe effect occurs in at least one ablation surface where the functional optical fiber coupler 32 or 33 is adhesively bonded to each other. That is, the optical fiber coupler which has an optical fiber fringe can be manufactured by the manufacturing method which cuts smoothly in this way.

According to the present invention, it is possible to solve the problem of channel isolation occurring when the fused tensile optical fiber coupler is applied to anisotropic polarization and narrowing / polarization of narrow channels. First, in a conventional commercial product, not only can a channel space of up to about 1480/1550 about 70 nm be formed, but the channel spacing at this time is already lowered by 12-15 dB. The channel spacing of the 1310/1550 coupler of the present invention can be formed up to 30 dB. In addition, when applied to the harmonics / offsets of narrow channels, the prior art causes the channel spacing to be poor and the coupling coefficients of the floating polarized light due to the highly asymmetrical structure of the coupler itself. In such a situation, since the length of the optical fiber action must be made very long because it is applied to the harmonic / offset of a narrow channel, a serious phase difference occurs due to the bipolar polarized light, thereby deteriorating the channel spacing. The coupler of the present invention solves this point.

In addition, the present invention solves the problem of the instability of the optical fiber coupler and the effective effective length in the conventional side grinding type. C.V.Cryan has already proposed the concept of fusion side polished fiber coupler in 1992. However, their fiber-optic polishing method uses a grinding grindstone to effectively form a long working length, and compensates for the difficult problem of fusing a bright fiber by adding one layer of liquid silicon dioxide. . In addition, although the effective action length is formed very long by performing the tensioning operation on the fused side polished optical fiber coupler, it is not described to manufacture the narrow channel optical fiber combiner by coupling the guide effect action to the coating part. . On the other hand, since the optical fiber coupler according to the present invention can be said to have a circular symmetrical shape, the optical fiber coupler is a symmetrical shape of a circular cross-sectional view of the optical fiber after fusion stretching, and does not form a structure like a conventional dumbbell shape. Therefore, the channel spacing does not become thermally nitrided even when the optical fiber is stretched for a very long time because the anisotropy of the coupling coefficient and the polarized light is not caused. Furthermore, the cross section of the optical fiber maintains a circular shape even if it is heated and stretched for a long time. Therefore, according to the present invention, it is possible to manufacture a narrow channel or low-resonance optical fiber coupler, very suitable for the use of high-density optical communication system, and can solve the problem of the conventional manufacturing technology related to all-optic fiber coupler.

In addition, if a material such as an optical amplification medium, optical nonlinear material, optical chromatic dispersion material, optical birefringent material, liquid crystal or photonic crystal is installed on the cross-section of the laser ablation optical fiber and then subjected to sealing again, another form of An optical fiber type device can be manufactured.

Figure 4a is an exemplary view showing another manufacturing method of the all-optical fiber device by the laser micromachining process of the present invention. The device used in FIG. 4A includes an optical fiber 41 having a covering portion 411 and a fiber core 412, a first laser 42, a reflector 43, a convex lens 44, a second laser 45, The convex lens 46, the screen 47, the third laser 48 and the photo detector 49.

In FIG. 4A, first, the covering portion 411 is partially cut out using the first laser 42, and the concentration of the reflected light and the convex lens 43 is caused by the movement or rotation of the reflector 43 during the ablation process. The full range 413 including the dissipation field exposed surface 414 is ablation.

Then, the coating portion to be cut off by the first laser 42 by the interference fringe spacing obtained through the convex lens 46 and the second laser 45 to the dissipation field exposure surface 44 through the screen 47 ( 411 is determined. In addition, in the case where the optical fiber 41 is bent in the form having the radius of curvature 415 before the ablation, the coating portion 411 to be excised with the first laser 42 by controlling the radius of curvature 415 when the ablation is performed again. The length of is determined.

Figure 4b is an exemplary view showing another manufacturing method of the all-optical fiber device by the laser micromachining process of the present invention. Although the same reference numerals are used for the same elements as those in FIG. 4A, in FIG. 4B, when the optical fiber 41 is ablated using the first laser 42, the optical fiber 41 is rotated to form a ring on the optical fiber 41. The dissipation field exposed surface 414 of is shown.

FIG. 5A is a photograph of a fiber ablation cross section fabricated using the method, FIG. 5B is a photograph of a laser ablation center zone, and FIG. 5C is a photograph of a laser ablation edge zone.

6A and 6B are exemplary views showing the application surface of the manufacturing method of the all-optical fiber type device by the laser micromachining process according to the present invention. By using the above ablation method, two optical fibers 61 and 62 after ablation are fabricated, and the coupling sections 63 may be formed by adhesively bonding the ablation portions to each other and heating and fusing them. In addition, tensioning the coupling regions 63 can change the optical coupling ratio. Of course, it is also possible to use directly without performing a tensioning operation.

7 is an exemplary view showing a 2x2 optical fiber coupler and a 4x4 optical fiber coupler fabricated using the laser ablation method of the present invention.

The 2x2 optical fiber coupler 70 fabricates the optical fiber element 71 by using the laser ablation method to bond the two ablation portions of the optical fiber element 71 having the same structure to each other, and then to fuse and pull the fiber cores. (712) Made to lose its original function.

Then, the 4x4 optical fiber coupler 80 bonds the two optical fiber elements in the same manner as the fabrication method of the 2x2 optical fiber coupler, and then performs laser ablation thereon. Thereafter, two identical structures are overlapped with each other and then manufactured by performing fusion and tension.

8 is an exemplary diagram (7x7 is illustrated in the drawing) of an NxN optical fiber coupler fabricated using the laser ablation method of the present invention.

The NxN optical fiber coupler 81 is manufactured by fabricating the optical fiber elements 71 by the ring-shaped laser ablation method as described above, and then performing fusion and tensioning by bonding the cut portions of the N optical fiber elements 71 to each other.

9A is an exemplary diagram of an optical fiber add drop multiplexer fabricated using the laser ablation method of the present invention. Similarly, two optical fiber elements 71 are first produced by the above laser ablation method. Then, the cut portions of the two optical fiber elements 71 are adhesively bonded to each other to form the optical fiber fringe 82 in the coupling region, and then the optical fiber add drop multiplexer 83 is manufactured by performing fusion and tension again.

9B is an exemplary diagram of a tandem optical fiber add drop multiplexer fabricated using the laser ablation method of the present invention. As shown, the tandem optical fiber add drop multiplexer fabricated using the inventive laser ablation method is constructed by two optical fiber add drop multiplexers bonded to each other at the output / input stage.

10 is an exemplary diagram of an adjustable fiber optic add drop multiplexer fabricated using the laser ablation method of the present invention. Similarly, although the adjustable optical fiber add-drop multiplexer manufactured using the laser ablation method of the present invention manufactures two optical fiber elements 71 and 72 by the laser ablation method as described above, the distance between the interference fringes is controlled. The difference is that the cutting depth of the optical fiber 72 is cut relatively deep. When the two optical fiber elements 71 and 72 are bonded to each other in this manner, voids are formed by the difference in depth, and the optical chromatic material 90 (for example, a polymer) in which the refractive index changes with temperature in the voids after fusion again Polymer, etc.) to form an adjustable fiber optic add drop multiplexer 84.

11A is an exemplary view of an optical fiber fringe fabricated using the laser ablation method of the present invention. The optical fiber fringe 85 manufactured using the laser ablation method of the present invention cuts the optical fiber 73 at intervals with a first laser using the laser method, and then, the plurality of dissipation field exposed surfaces 74 are disposed thereon. It is produced by forming. In addition, if the depth of ablation is gradually changed during ablation with a first laser, an optical fiber fringe 86 having a dissipation field exposed surface 74 in a vertical shape may be manufactured as shown in FIG. 11B.

12 is an illustration of another type of adjustable fiber optic add drop multiplexer fabricated using the laser ablation method of the present invention. As shown, after the two optical fiber fringes 85 of FIG. 11A are adhesively bonded and fused together, a plurality of pores therein are filled with an optical color dispersion material whose refractive index changes with temperature, thereby adjusting the adjustable optical fiber add. The drop multiplexer 87 is manufactured.

As described above, the present invention performs laser ablation directly on the partial coating of the optical fiber to expose the dissipation field in the optical fiber, and the optical fiber type by laser micromachining treatment which can be known by measuring the laser beam interference fringe spacing depth. Provided is a method of fabricating an element. The working length of the dissipation field formed by laser ablation can be controlled by changing the radius of curvature of the optical fiber. After the lateral ablation, the optical fibers are joined together, and the optical fiber coupler, the optical fiber add drop multiplexer, and the Mach- are generated by coupling to the dissipation field of the optical fiber, followed by heat fusion or fusion taper. Optical devices such as Zehnder filters and optical fiber fringes can be fabricated.

In the detailed description of the present invention as described above, specific embodiments of the present invention have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

In the present invention as described above, by performing laser ablation directly on the partially coated portion of the optical fiber to expose the dissipation field in the optical fiber, the optical fiber type by the laser micromachining process can be known by measuring the laser beam interference fringe spacing depth Provided is a method of fabricating an element. In addition, the working length of the dissipation field formed by laser ablation can be controlled by changing the radius of curvature of the optical fiber. After the lateral ablation, the optical fibers are joined together, and the optical fiber coupler, the optical fiber add drop multiplexer, and the Mach- are generated by coupling to the dissipation field of the optical fiber, followed by heat fusion or fusion taper. Optical devices such as Zehnder filters and optical fiber fringes can be fabricated.

Claims (14)

(a) providing at least one fiber having a fiber core and a cladding portion, (b) cutting the covering portion with a first laser beam to form a dissipation field exposed surface and simultaneously entering a second laser beam into the dissipation field exposed surface; and (c) determining a depth at which the first laser beam cuts off the covering portion at intervals of the interference fringes reflected by the second laser beam. Manufacturing method of all-optical fiber type device. According to claim 1, wherein step (b), Cutting the covering portion with the first laser beam and simultaneously rotating the optical fiber to form a ring-shaped optical fiber dissipation field exposed surface; Cutting the coating portion with the first laser beam and simultaneously bending the optical fiber, and determining a length for the first laser beam to cut the coating portion by a radius of curvature during the bending of the optical fiber; Reflecting the first laser beam by at least one reflector before the first laser beam ablates the covering portion; Moving or rotating the reflector to include the dissipation field exposed surface in the ablation range of the first laser beam. (a) providing both optical fibers each having a fiber core and a cladding portion, (b) cutting off the covering portion of the optical fiber with the first laser beam to form a dissipation field exposed surface and simultaneously incident the second laser beam to the dissipation field exposed surface; (c) determining a depth at which the first laser beam ablates the covering portion at intervals of an interference fringe reflected by the second laser beam, (d) repeating steps (b) to (c) for the other optical fiber; (e) forming an optical fiber coupler by adhesively bonding, fusing and stretching the dissipation field exposed surfaces of both optical fibers. The method of claim 3, wherein step (b) comprises: Cutting the covering portion with the first laser beam and simultaneously rotating the optical fiber to form a ring-shaped optical fiber dissipation field exposed surface; Cutting the coating portion with the first laser beam and simultaneously bending the optical fiber, and determining a length for the first laser beam to cut the coating portion by a radius of curvature during the bending of the optical fiber; Reflecting the first laser beam by at least one reflector before the first laser beam ablates the covering portion; And cutting off the covering portion by concentrating the first laser beam with at least one lens before the first laser beam has ablated the covering portion. The method of claim 4, wherein step (b) comprises: Moving or rotating the reflector to include the dissipation field exposure surface in the ablation range of the first laser beam. (a) providing at least one optical fiber having a fiber core and a cladding portion; (b) forming a dissipation field exposed surface which winds the optical fiber by cutting the coated portion with the first laser beam and simultaneously rotating the optical fiber; (c) determining a depth at which the first laser beam ablates the covering portion at intervals between the interference fringes reflected by the second laser beam; (d) repeating steps (b) to (c) for each optical fiber, (e) forming the optical fiber coupler by adhesively bonding the dissipated field exposed surface of the all-optical fiber to fuse and stretch the optical fiber coupler. (a) providing a positive fiber having a fiber core and a coating portion, respectively; (b) cutting off the covering portion of the optical fiber with a first laser beam to form a dissipation field exposed surface and simultaneously injecting a second laser beam to the dissipation field exposed surface; (c) determining a depth at which the first laser beam ablates the covering portion at intervals between the interference fringes reflected by the second laser beam; (d) repeating steps (b) to (c) for the other optical fiber; (e) adhesively bonding and fusing the dissipation field exposed surface of the positive fiber, (f) forming an optical fiber fringe in the fiber core, and (g) constructing an optical fiber add drop multiplexer by tensioning the optical fiber to adjust optical properties. The method of claim 7, wherein And said optical fiber add drop multiplexer is constituted by a plurality of optical fiber add drop multiplexers formed in series. (a) providing a positive fiber having a fiber core and a coating portion, respectively; (b) cutting off the covering portion of the optical fiber with a first laser beam to form a dissipation field exposed surface and simultaneously incident the second laser beam to the dissipation field exposed surface; (c) determining a depth at which the first laser beam ablates the covering portion at intervals between the interference fringes reflected by the second laser beam; (d) repeating steps (b)-(c) for the other optical fiber and at the same time forming a deeper depth of the cut-out portion of the coating portion; (e) bonding and fusing the dissipation field exposed surface of the positive fiber to form voids in portions having different depths of the optical fiber; and (f) filling said voids to form said adjustable fiber optic add-drop multiplexer. 10. The method of claim 9, wherein the optical color dispersion material is a polymer polymer and / or the refractive index of the optical color dispersion material varies with temperature. (a) providing at least one optical fiber having a fiber core and a cladding portion; (b) cutting the covering portion at intervals with a first laser beam to form a plurality of dissipation field exposed surfaces and simultaneously injecting a second laser beam into said dissipation field exposed surfaces; (c) determining the depth at which the first laser beam cuts off the covering portion at intervals between the interference fringes reflected by the second laser beam to form the optical fiber fringe. How to make a fringe. The method of claim 11, wherein step (b) comprises: And (c) forming the optical fiber fringe in a vertical shape by gradually changing the depth at which the first laser beam cuts off the covering portion. (a) providing an optical fiber having two optical fiber fringes according to claim 12, (b) bonding and fusing the positive fiber to form a plurality of voids on the exposed surface of the plurality of dissipation fields between the optical fiber fringes; (c) forming an adjustable fiber optic add-drop multiplexer by filling an optical chromatic dispersion material into the plurality of voids. The method of claim 13, Wherein said optical chromatic dispersion is a polymeric polymer and / or the refractive index of said optical chromatic dispersion varies with temperature.

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