JPH05341151A - How to connect optical components and optical fibers - Google Patents

Abstract

PURPOSE:To provide a method for connecting an optical component to an optical fiber, whereby fusion is achieved at good controllability. CONSTITUTION:In a connecting method including forcing the end face of an optical component 10 made of quartz material into abutting contact with that of an optical fiber 5 and fusing the optical component 10 to the optical fiber 5 by application of a carbon dioxide laser beam 4 to the abutting portion, the clad 8 of the optical fiber 5 is projected from the junction face of the optical component 10 and along the direction in which the carbon dioxide laser beam 4 is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end face of an optical component made of a silica-based material and an end face of an optical fiber, and the joint part is irradiated with carbon dioxide laser light to fuse the optical component and the optical fiber. And a method for connecting an optical component and an optical fiber.

[0002]

2. Description of the Related Art Optical parts using quartz as a material are phosphorus,
By using impurities such as boron, germanium, titanium, and fluorine as dopants, the refractive index with respect to light can be arbitrarily controlled, so that an optical waveguide with low loss can be provided.

Recently, communication optical components such as an optical branching device, a wavelength multiplexer / demultiplexer, and an optical filter in which an optical waveguide is processed with high accuracy and high density by using photolithography have been actively developed.

Generally, a carbon dioxide gas laser is used for fusion bonding of a silica-based optical component (having an optical waveguide) and a silica-based optical fiber. The carbon dioxide laser has a wavelength of 10.
Since it is 6 μm and is well absorbed by the quartz material, it is an optimum heat source for fusing. Moreover, by collecting the carbon dioxide gas laser light with the lens, it is possible to irradiate an arbitrary portion of the material with a minute spot to selectively melt the material.

FIG. 11 is an external perspective view of an example of an optical component, and FIGS. 12 and 13 are side views for explaining a conventional method for connecting an optical component and an optical fiber.

As shown in FIG. 11, the optical component 1 is made of a silica-based material, and has a core 2 for transmitting light (in the waveguide shown by a broken line) and a silica-based material. The cladding 3 has a low refractive index and is formed so as to surround these cores 2.

Both end surfaces 1a and 1b of the optical component 1 are upper surfaces 1c.
It is cut at a right angle with respect to, is mirror-polished, and the core 2 is exposed.

As shown in FIG. 12, the end surface 1 of the optical component 1 is
The carbon dioxide laser light 4 focused by the lens 3 into a spot shape is used for a, and the core 6 of the optical fiber 5 and the core 2 of the optical component 1 are fused so as to be coaxial. At this time, the height of the upper surface of the optical component 1 at the joint portion 7 projects from the upper surface of the optical fiber 5, and the spot of the carbon dioxide laser light 4 irradiates the boundary line of the joint portion 7 in the arrow P ₁ direction.

In some cases, as shown in FIG. 13, the height of the upper surface of the optical component at the joint and the height of the upper surface of the optical fiber are equal.

FIG. 14 is a plan view showing the irradiation state of spots of carbon dioxide laser light on the joint between the optical fiber and the optical component.

As shown in the figure, the carbon dioxide laser beam 4 is irradiated so that the center of the spot 4a is located at the joint 7 between the optical component 1 and the optical fiber 5.

[0012]

However, since the silica-based material used for the optical component 1 and the optical fiber 5 has a high absorption rate for the carbon dioxide gas laser light 4, most of the irradiated carbon dioxide laser light 4 is quartz. It is absorbed near the surface of the system material (see FIGS. 15 (a) and 15 (b)).

Therefore, the temperature of the surface of the quartz material irradiated with the carbon dioxide laser beam 4 rapidly rises, and the quartz melts and fusion proceeds, whereas the inside and the back of the quartz material Only a small amount of energy not absorbed on the surface and energy due to heat conduction from the surface can be contributed.

Incidentally, FIG. 15A is a schematic diagram showing the relationship between the optical fiber and the carbon dioxide laser light, and FIG. 15B is a schematic view showing the relationship between the optical component and the carbon dioxide laser light. In FIGS. 9A and 9B, each arrow P ₂ indicates the distribution of carbon dioxide laser light.

Since the optical fibers 5 and the optical waveguide 1 are formed so that the claddings 3 and 8 surround the cores 2 and 6, the carbon dioxide gas laser light 4 from the surface irradiates the claddings 3 and 8. There is a problem that a difference occurs between the melting temperature and the melting temperatures of the cores 2 and 6. That is, even if the surfaces of the clads 3 and 8 are sufficiently melted by being irradiated with the carbon dioxide laser beam 4, the melting is insufficient near the cores 2 and 6 and the back side of the joint (the lower side of the figure). The mechanical strength will deteriorate.

On the contrary, when the carbon dioxide laser beam 4 is sufficiently irradiated to sufficiently melt the back side of the joint portion 7, deformation due to excessive melting occurs from the surface to the cores 2 and 6.
There is a problem that the optical transmission loss at the fused portion increases.

Therefore, an object of the present invention is to solve the above problems and to provide a method of connecting an optical component and an optical fiber in which fusion is performed with good controllability.

[0018]

In order to achieve the above-mentioned object, the first invention of the present application is to make an end surface of an optical component made of a silica-based material and an end surface of an optical fiber abut against each other, and a carbon dioxide gas laser at a joint thereof. In a connection method of irradiating light to fuse an optical component and an optical fiber, the cladding end surface of the optical fiber is projected toward the carbon dioxide laser light irradiation direction side from the joint surface of the optical component and fused.

According to a second aspect of the present invention, the end faces of an optical component made of a silica-based material and the end face of an optical fiber are abutted against each other, and a carbon dioxide gas laser beam is applied to the joint to fuse the optical component and the optical fiber. In the connection method for attachment, the spot center of the carbon dioxide laser light with which the joint is irradiated is shifted in the optical axis direction from the joint surface on the optical component side and then irradiated.

According to a third aspect of the present invention, the end faces of an optical component made of a silica-based material and the end face of an optical fiber are abutted against each other, and a carbon dioxide gas laser beam is irradiated to the joint to fuse the optical component and the optical fiber. In the splicing connection method, after the end face of the optical fiber is heat-treated, the optical parts are butted and fused with carbon dioxide laser light.

According to a fourth aspect of the present invention, the end face of an optical component made of a quartz material and the end face of an optical fiber are butted against each other,
In the connection method of irradiating the joint part with a carbon dioxide laser beam to fuse the optical component and the optical fiber, another carbon dioxide gas laser beam is used together with the carbon dioxide gas laser beam, except the irradiation direction of the carbon dioxide gas laser beam around the joint part. And the density of carbon dioxide laser light is smaller than the density of other carbon dioxide laser light.

According to a fifth aspect of the present invention, the end faces of an optical component made of a silica-based material and the end face of an optical fiber are abutted against each other, and a carbon dioxide gas laser beam is irradiated to the joint to fuse the optical component and the optical fiber. In the connection method of bonding, the carbon dioxide laser light irradiation part is melted by spraying a gas for cooling.

[0023]

According to the first invention of the present application, since the cladding of the optical fiber is projected toward the carbon dioxide laser light irradiation direction side from the joint surface of the optical component, the irradiation amount of the carbon dioxide laser light near the end face of the optical fiber is reduced. The amount of carbon dioxide gas laser light reaching the core increases from the core to the back side, and the difference in melting rate decreases.

According to the second invention of the present application, since the spot center of the carbon dioxide laser light applied to the joint is displaced in the optical axis direction on the optical component side, the heat capacity of the optical component and the heat capacity of the optical fiber are obtained. The melting of both end faces proceeds at the same rate with good controllability.

According to the third aspect of the present invention, since the end face of the optical fiber is heat-treated, the cladding has a curvature and has a curvature, and when the optical components are butted, a gap is formed and the carbon dioxide laser beam is irradiated. The area is increased, and the melting of the joint is sufficiently advanced.

According to the fourth invention of the present application, since the carbon dioxide laser beam to the joint is irradiated from not only one direction but also the other direction, the optical component and the optical fiber are uniformly melted.

According to the fifth aspect of the present invention, since the gas is blown onto the carbon dioxide laser light irradiation portion, local excessive melting of the fusion portion is prevented and the temperature in the depth direction becomes uniform.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory view of a first embodiment of a method for connecting an optical component and an optical fiber according to the present invention. The same reference numerals are used for the members common to the conventional example.

In the figure, 10 indicates an optical component, and 5 indicates an optical fiber. The optical component 10 includes, for example, a core (waveguide) 11 that transmits light for optical communication and a clad 12 formed so as to surround the core 11 (substantially the same shape as the optical component shown in FIG. 11). The end surface 10a of the optical component 10 where the optical fiber 5 is joined is perpendicular to the upper surface 10c and is mirror-polished, and the core 11 is exposed on the end surface 10a. On the end face 10a of such an optical component (on the right side of the drawing) 10, the cladding 8 of the optical fiber 5 is provided.
Of the optical fiber 5 and the core 1 of the optical component 10 so that the upper surface of the optical component 10 protrudes from the upper surface 10c of the optical component 10.
1 and 1 are butted so as to be coaxial with each other.

The core 6 of the optical fiber 5 and the core 11 of the optical component 10 are aligned with each other by monitoring the light output from the optical fiber side on the core side of the optical component with a measuring device (not shown). Done.

The carbon dioxide laser light 4 in the form of a spot which is condensed by the lens 3 made of ZnSe, for example, is projected onto the clad 8 of the optical fiber 5 at the joint 13 where the optical component 10 and the optical fiber 5 are butted against each other. Irradiation is performed in the direction of arrow P ₁ from the side (upper side of the figure).

As a result, the clad 12 of the optical component 10 and the clad 8 of the optical fiber 5 are fused together, and the core 11 of the optical component 10 and the core 6 of the optical fiber 5 are fused together.

The optical component 10 and the optical fiber 5 are made of a quartz material, and the carbon dioxide laser light 4 is in a single mode described later.

Next, the operation of the embodiment will be described.

The cladding 8 of the optical fiber 5 is the optical component 10
Since it protrudes from the upper surface 10c of the carbon dioxide laser light toward the irradiation direction side, the irradiation amount of the carbon dioxide laser light 4 near the right end face of the optical fiber 5 increases, and the arrival amount of the carbon dioxide laser light 4 from the vicinity of the core 6 to the back side is increased. It improves and the melting rate difference decreases. As a result, the optical fiber 5 and the optical component 10 are evenly fused at the joint 13 between the optical fiber 5 and the optical component 10.

Next, specific numerical values will be described, but the present invention is not limited thereto.

The height of the core 11 of the optical component 10 is about 9 μm.
m, the height from the core 11 to the upper surface 10c of the clad 12 is about 8 μm, the core diameter of the optical fiber 5 is about 9 μm and the clad diameter is about 125 μm, the clad 8 of the optical fiber 5 is more than the clad 12 of the optical component 10. It projects about 50 μm. When the joint portion 13 is irradiated with the carbon dioxide laser light 4 in this state, the clad 8 near the core 6 of the optical fiber 5 and the clad 12 of the optical component 10 are sufficiently melted, and the back side of the optical fiber 5 (bottom of the figure). Since sufficient energy reaches the side), the optical signal transmission loss due to fusion is 0.5d.
It was possible to form the permanent connection part which could be suppressed to B or less and which was excellent in mechanical strength.

In the above, according to the present embodiment, the clad 8 of the optical fiber 5 is projected from the joint portion 13 of the optical component 10 toward the irradiation direction side of the carbon dioxide gas laser light 4 and fused, so that the optical fiber 5 and the optical component are joined. Fusing with 10 is performed with good controllability.

FIG. 2 is an explanatory diagram showing another configuration example of the first embodiment.

The difference from the embodiment shown in FIG. 1 is that the thickness of the clad 22 is thin only in the vicinity of the joint portion 21 of the optical component 20. Also in the configuration example, as in the embodiment shown in FIG. 1, the clad 8 near the core 6 of the optical fiber 5 and the clad 22 and the core 23 of the optical component 20 are sufficiently melted, and the back side of the optical fiber 5 is formed. Since sufficient energy reaches the optical fiber 5, the optical fiber 5 and the optical component 20 are fused together with good controllability.

FIG. 3 is an explanatory diagram for explaining the second embodiment.

In the embodiment shown in FIG. 1, an example in which the optical fiber 5 is projected in the irradiation direction at the melting points of the optical fiber 5 and the optical component 20 has been described, but the joining surfaces of the optical fibers are the same and carbon dioxide laser light is used. The fusion is also improved by displacing the spot center of the above from the fusion portion to the optical component side.

In the figure, 5 indicates an optical fiber, and 3
0 indicates an optical component.

Here, the single mode carbon dioxide gas laser beam 4 has a Gaussian distribution type energy distribution as shown in FIG. This distribution is substantially maintained even if the carbon dioxide gas laser light 4 is condensed using the lens 3 made of ZnSe. That is, in the single mode carbon dioxide gas laser beam 4, the effective power density tends to increase as it approaches the center of the spot 4a. FIG. 4 is a diagram showing the relationship between the distance from the spot center of the carbon dioxide laser light used in this embodiment and the energy.

Therefore, the spot 4 of the carbon dioxide laser beam 4
By displacing the center of a toward the optical component side with respect to the joint portion 31, it is possible to irradiate the optical fiber 5 with the peripheral portion of the Gaussian-distributed carbon dioxide gas laser light, that is, the portion with low power density. The excessive melting of No. 5 can be suppressed.

Further, if the difference in heat capacity between the optical fiber 5 and the optical component 30 is corrected and the shift amount is set so that the temperature of both the optical fiber 5 and the optical component 30 rises substantially uniformly, the fusion with low loss is achieved. You can get a part.

Further, the shift amount ΔL of the center of the spot 4a of the carbon dioxide laser 4 to be irradiated is 100 μm to 900 μm.
And set the power density of carbon dioxide laser light 4 to 1.3 ×
By setting it to 10 ² W / cm ^{2 to} 1.5 × 10 ³ W / cm ² , melting of the quartz-based material proceeds with good controllability, so that the fused portion is excessively melted and loss is increased. It is possible to obtain a fused portion having low loss and high mechanical strength (fusion loss of about 0.2 dB, tensile strength of about 700).
g).

FIG. 5 is an explanatory diagram for explaining the third embodiment.

The difference from the embodiment shown in FIG. 1 is that the end surface of the optical fiber is heat-treated to have a curvature before the optical fiber is fused and bonded to the optical component.

In FIG. 5, reference numeral 40 denotes an optical component having the same structure as the optical component 1 shown in FIG. 11, and 41 denotes an optical fiber having the same structure as the optical fiber 5 shown in FIG. ..

The optical fiber 41, after being cut by an optical fiber cutter (not shown), is heat-treated at the tip by, for example, a flame of arc discharge, and the cutting surface 41a is melted to have a curvature in the periphery.

The core 4 of the optical fiber 41 that has been heat-treated
2 is aligned with the core 43 of the optical component 40 so as to be coaxial with each other, and then the joint portion 44 is irradiated with the carbon dioxide gas laser beam 4 to perform fusion bonding, which results in a connection as shown in FIG. It was That is, the core 42, the core 43, and the clad 45
And the clad 46 is fused. Incidentally, FIG. 6 is a connection state diagram by the method shown in FIG.

When fusion was carried out in this manner, the splice loss was 0.2 dB / piece and the tensile strength was 1.5 kg. However, the cutting surface 4 of the optical fiber 41
If 1a is not heat-treated, splice loss is 0.2d.
The tensile strength was only 0.4 Kg, although it was the same as B / ke. This is because the carbon dioxide gas laser beam 4 is irradiated from above the joint, so that when the fusion at the point A is insufficient, a sharp angle V
Character-shaped gaps may occur, and in this case, when the optical fiber 41 is pulled, stress may be concentrated at point B and break. However, in the above method, the angle of the V-shaped gap is obtuse, and even if the optical fiber 41 is pulled, the tensile force is dispersed, so that high strength can be obtained.

In general, the fusion with the carbon dioxide gas laser beam 4 changes the temperature of the quartz glass irradiated with the carbon dioxide gas laser beam 4 due to a slight wavelength variation. However, by performing the pretreatment as described above, the strength is less likely to be deteriorated even if a portion where the fusion is insufficient is generated.

The thickness of the cladding layer 45 is about 20 μm.
The relative refractive index difference (Δn) between the cores 42 and 43 was 0.3%, and a 1.3 μm band single mode optical fiber was used as the optical fiber 41. Further, in the present embodiment, the heat treatment of the optical fiber 41 is performed using arc discharge, but the present invention is not limited to this, and a hydrogen oxygen flame or the like may be used to provide curvature.

FIG. 7 is an explanatory view for explaining the fourth embodiment, and FIG. 8 is a view showing an optical fiber and an optical component after fusion bonding by the method shown in FIG.

The feature in the figure is that the carbon dioxide laser light 4
Together with another carbon dioxide laser light 50,
1 is the center, and the carbon dioxide laser beam 4 is also irradiated from a direction other than the irradiation direction.

The carbon dioxide laser beam 4 is applied from above to the joining portion 51.
In some cases, the fusion of the back side of the optical fiber 5 may be insufficient when irradiating the surface. In order to prevent this insufficient fusion, the carbon dioxide gas laser beam is irradiated not only from the upper side but also from other directions.

In FIG. 7, 52 is a carbon dioxide laser beam 5
A lens for collecting 0 is shown. The power density of the carbon dioxide laser beam 4 irradiating the joint portion 51 from above is 3 × 10 ² W / c.
m ^{2 to} 7 × 10 ² W / cm ^2, and the power density of the carbon dioxide laser light 50 irradiating the joint 51 from below is 1 ×.
It was set to 10 ² W / cm ² to 4 × 10 ² W / cm ² .

First, a carbon dioxide gas laser beam 5 having a power density of about 2.1 × 10 ² W / cm ² is applied from the lower side of the silica-based optical component.
0 is kept on the joint 51 for about 1.5 seconds, and then the power density is about 4.5 × 10 from the upper side of the optical component 10.
^The joint portion is irradiated with carbon dioxide gas laser light 4 of ² W / cm ² . As a result, the carbon dioxide laser light 4 from above is also applied to the portion where the energy is difficult to reach, so that the joint 5
The contact portion 1 melts smoothly, and the optical fiber 5 and the optical component 10 are sufficiently fused as shown in FIG. Note that FIG. 7 shows a case where the present invention is applied to the first embodiment shown in FIG. 1, but the present invention is not limited to this, and it is also applicable to the second and third embodiments.

FIG. 9 is an explanatory diagram for explaining another configuration example related to the fourth embodiment.

In the figure, a silica-based optical component 62 is mounted on a metal block 61 fixed in a package 60. The core 6 of the optical fiber 5 (optical axis is perpendicular to the paper surface) is abutted so as to be coaxial with the core (optical axis is perpendicular to the paper surface) 63 exposed at the end (front surface) of the optical component 62. The optical component 62 is formed of a core 63 as a waveguide and a clad 64 surrounding the core 63 and having a lower refractive index than the core 63.

From two directions diagonally above the abutting portion of the optical fiber 5 and the optical component 62, the power density is about 1.5 × 1.
Carbon dioxide gas laser beams 65 (direction of arrow P ₄ ) and 66 (direction of arrow P ₅ ) of 0 ² W / cm ² are respectively collected by a ZnSe lens (not shown), and irradiated at the abutting portion for about 1 second. Then, the power density is about 4.
Carbon dioxide gas laser beam 4 of 0 × 10 ² W / cm ² is condensed by a ZnSe lens (not shown) and is irradiated on the abutting portion. As a result, the butted portion is melted smoothly, and the optical fiber 5 and the optical component 62 are fused. At this time, the fusion loss was about 0.2 dB, and the tensile load resistance was about 1.5 Kg.

FIG. 10 is an explanatory diagram for explaining the fifth embodiment.

The difference from the embodiment shown in FIG. 1 is that the surface of the joint is forcibly cooled by spraying a gas for cooling the carbon dioxide laser light irradiation portion.

In FIG. 10, reference numeral 70 designates a blowing nozzle for blowing a gas for cooling.

The optical component 10 comprises, for example, a rectangular core 11 having a cross section of about 9 μm × 9 μm on a quartz substrate having a thickness of about 1 mm.
And a clad 12 that embeds the core 11 to a height of about 10 μm. On the end face on the left side of the quartz optical component 10, a core 6 having a diameter of about 9 μm and a diameter of about 125 μm are provided.
The 1.3 μm single-mode optical fiber 5 for the 1.3 μm band, which is composed of the cladding 8 of m, is adjusted so that the optical axes thereof are coaxial with each other. In this state, He gas is supplied from the optical component 10 side toward the optical fiber 5 side in the direction of arrow P ₇ at about 10 min / min.
spray cc. At this time, the opening diameter of the spray nozzle 70 was about 2 mm, and it was held at a height of 1 mm from the clad 12 of the optical component 10. Power density of about 5.9 from above
When irradiated with a carbon dioxide gas laser beam 4 of × 10 ² W / cm ² , the fusion loss was about 0.3 dB, and the tensile withstand load was about 1.4.
A fused portion of Kg was obtained.

In the present invention, the cladding surface of the optical fiber and the cladding surface of the optical component coincide with each other in the second invention, but the invention is not limited to this, and the cladding of the optical fiber may be projected.

[0070]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) An optical fiber made of a quartz material,
It is possible to perform fusion bonding with an optical component made of a quartz-based material and having a waveguide with low loss and excellent mechanical strength.

(2) It is possible to improve the reliability and the life of the fused silica optical device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of a method for connecting an optical component and an optical fiber according to the present invention.

FIG. 2 is an explanatory diagram showing another configuration example of the first embodiment shown in FIG.

FIG. 3 is an explanatory diagram for explaining a second embodiment of a method for connecting an optical component and an optical fiber according to the present invention.

FIG. 4 is a diagram showing a relationship between a distance from a spot center of carbon dioxide laser light used in this example and energy.

FIG. 5 is an explanatory diagram for explaining a third embodiment of a method for connecting an optical component and an optical fiber according to the present invention.

FIG. 6 is a connection state diagram showing connection by the method shown in FIG.

FIG. 7 is an explanatory diagram for explaining a fourth embodiment.

8 is a diagram showing an optical fiber and an optical component after fusion bonding by the method shown in FIG.

FIG. 9 is an explanatory diagram illustrating another configuration example according to the fourth embodiment.

FIG. 10 is an explanatory diagram for explaining a fifth embodiment of the present invention.

FIG. 11 is an external perspective view of an example of an optical component used in this example and a conventional example.

FIG. 12 is a side view for explaining a conventional method for connecting an optical component and an optical fiber.

FIG. 13 is a side view for explaining a conventional method for connecting an optical component and an optical fiber.

FIG. 14 is a plan view showing an irradiation state of spots of carbon dioxide laser light on a joint portion of an optical fiber and an optical component.

FIG. 15A is a schematic diagram showing a relationship between an optical fiber and carbon dioxide laser light, and FIG. 15B is a schematic diagram showing a relationship between optical components and carbon dioxide laser light.

[Explanation of symbols]

 3, 52 lens 4, 50, 65 carbon dioxide laser light 4a spot 5, 41 optical fiber 6, 11, 23, 42, 43, 63 core 8, 12, 22, 45, 46, 64 clad 10, 20, 30, 40, 62 Optical components 10a, 10b End surface 10c Upper surface 13, 21, 44, 51 Joining portion 60 Package 61 Metal block 70 Blowing nozzle

Claims (10)

[Claims] 1. A connection method in which an end face of an optical component made of a quartz-based material and an end face of an optical fiber are abutted against each other, and a carbon dioxide gas laser beam is irradiated to the joint portion to fuse the optical component and the optical fiber. A method for connecting an optical component and an optical fiber, characterized in that a clad end face of the optical fiber is projected toward a carbon dioxide gas laser beam irradiation direction side from a joint surface of the optical component and fused. 2. The optical component and the optical fiber according to claim 1, wherein the protrusion amount of the clad of the optical fiber with respect to the joint surface of the optical component is within a range of 30 μm to 60 μm. Connection method. 3. A connection method in which an end face of an optical component made of a quartz-based material and an end face of an optical fiber are abutted against each other, and a carbon dioxide laser beam is irradiated to the joint portion to fuse the optical component and the optical fiber. A method for connecting an optical component and an optical fiber, wherein the spot center of the carbon dioxide laser light with which the joint portion is irradiated is shifted in the optical axis direction from the joint surface on the side of the optical component and then irradiated. 4. The deviation of the spot center of the carbon dioxide laser light is set from 100 μm to 900 μm, and the power density of the carbon dioxide laser light is 1.3 × 10 ² to 1.
The method for connecting the optical component and the optical fiber according to claim 3, wherein the setting is made up to 5 × 10 ³ W / cm ² . 5. A connection method in which an end face of an optical component made of a quartz-based material and an end face of an optical fiber are abutted against each other, and a carbon dioxide gas laser beam is irradiated to the joint portion to fuse the optical component and the optical fiber. After the heat treatment of the end face of the optical fiber, the optical components are butted and fused with the carbon dioxide gas laser beam to connect the optical component and the optical fiber. 6. The method of connecting an optical component and an optical fiber according to claim 5, wherein the end surface of the optical fiber is provided with a curvature by using arc discharge or hydrogen-oxygen flame. 7. The carbon dioxide gas laser beam is used together with another carbon dioxide gas laser beam to irradiate from a direction other than the irradiation direction of the carbon dioxide gas laser beam around the joint. Item 7. A method for connecting the optical component according to any one of items 6 and the optical fiber. 8. A connection method in which an end face of an optical component made of a quartz-based material and an end face of an optical fiber are abutted against each other, and a carbon dioxide laser beam is irradiated to the joint portion to fuse the optical component and the optical fiber. The carbon dioxide gas laser beam is used together with the carbon dioxide gas laser beam to irradiate from a direction other than the irradiation direction of the carbon dioxide gas laser beam around the joint, and the density of the carbon dioxide gas laser beam is set to the density of the other carbon dioxide gas laser beam. A method for joining an optical component and an optical fiber, which is characterized by being made smaller. 9. A connection method in which an end face of an optical component made of a quartz-based material and an end face of an optical fiber are abutted against each other, and a carbon dioxide gas laser beam is irradiated to the joint portion to fuse the optical component and the optical fiber together. A method for connecting an optical component and an optical fiber, characterized in that the carbon dioxide laser light irradiation portion is fused while being blown with a gas for cooling. 10. The method for connecting an optical component and an optical fiber according to claim 9, wherein an inert gas such as helium, argon, or nitrogen is used as a gas blown onto the carbon dioxide laser beam irradiation portion.