JPS58144806A - Coupling method of optical fiber and lens - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy in coupling of an optical fiber and a lens by adjusting an optical fiber for far IR light to the focus position of the lens, working the lens with CO2 laser light conducted to the fiber and inserting the fiber into the worked hole. CONSTITUTION:To determine the coupling position of an optical fiber 1 and a lens 2, the beam of light which is made incident to the lens 2 is conducted to an optical fiber 5 for far IR light and is made incident to an optical power meter 7 through a line monitor 8, then a fine adjuster 9 adjusts the position of the fiber 5. After the coupling position is determined, the light of a CO2 laser 6 is conducted to the fiber 5 which is already adjusted in the coupling position, and the end face of the lens 2 is worked by the CO2 laser 6 light radiated from the end part thereof. The fiber 1 is inserted into the hole formed on the surface of the lens 2 by the laser 6 light, and said part is reinforced with an adhesive 8 for reinformcement, whereby the coupling system of the fiber 1 and the lens 2 is constituted. The positioning accuracy of the coupling is thus improved and the deviation in the position after the coupling is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connector for an optical fiber via a lens, and to a method for coupling the lens to an optical fiber.

FIG. 1 shows an example of a combination of a conventional optical 7-eyeper and a lens. 1st I! In l, l is light 7 eye pa, house is lens, 8 is reinforcing adhesive, and number 4 is reinforcing group ^.

The joining position of Hikari 7 fiber 1 and lens 1 is adjusted using a fine adjustment table, and then reinforcing it with composite l1ll and Ushida et al.'s adhesive 8. The financial position is on the end surface of the lens′
Since it has a movable structure, the convergence line of the adhesive moves the light 7 eyelid, making it possible to couple it to the correct position.In addition, in such a bond, the temperature after bonding There was a drawback that good results could not be obtained against vibrations, shocks, etc. The present invention combines the optical 7-eyeper and the lens with high precision,
In order to remove the positional shift after coupling, the light rays converged by the lens are guided to the far-infrared optical 7-eyeper, the far-infrared optical fiber is adjusted to the position on the lens surface where the optical power is at its peak, and then, Using CO and laser light guided by a far-infrared optical fiber whose coupling position has been adjusted, a hole is made at the focal point on the lens surface by laser processing, the optical fiber is inserted into the hole, and the relative position of the optical fiber and lens is created. It is designed to perform target positioning and fixation. Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIGS. 2(a) and 2(b) show embodiments of the present invention, and 1
is an optical fiber, 3 is a lens (cylindrical), 8 is a synthetic 1fl
fl is a reinforcing adhesive such as solder, and 4 is a reinforcing metal fitting.

FIG. 8 shows the prefecture for positioning and drilling the holes shown in FIG. 2. In Figure 88, 5 indicates far infrared light 7 AiPaC, such as sulfide glass, fluoride glass,
Chalcogenide glass is used. As an example, the transmission wavelength range of the MuB-B system is S~1sAs-8e-Te, 1%
1 to 18p votes), 6 is a 00° laser (wavelength 1
0.6μ), 7 is an optical power meter (wavelength: 1.8μ),
S is a line monitor C optical directional coupling II), and 9 is a fine movement table.

To determine the coupling position of the light 7 eyeper 1 and the lens 3, the light il1 incident on the lens 3 must be
For example, for signal transmission, a wavelength of 1.8 μm) is guided to the far-infrared light 7 eyeper 6', and is incident on the optical power meter 7 via the line monitor 8. Adjust the position of the infrared optical fiber 6. After the binding position is determined, 00
．． The light from the laser 6 is guided to the far-infrared optical fiber 6 whose coupling position has been adjusted, and CO is emitted from the end of the far-infrared optical fiber.

The end face of the lens barrel is processed using laser light. At this time, the lens 3 is made of multi-component glass such as Selfoc lens or quartz glass with a cow spherical shape, so it is
．． The optical loss in the wavelength range of the laser is I O”~101
Since it is opaque at 0aB/i@, it absorbs a lot of light energy, and the surface of the lens 2 can be processed. 0
0. The optical fiber l is inserted into the hole formed on the lens surface by the laser beam, and the part is reinforced with an adhesive 8 such as synthetic am or glass solder to form a coupling system between the optical fiber l and the lens hole. By coupling in this manner, the relative positioning, fixing, and fixing of the optical fiber 1 and the lens 8 can be performed with high accuracy, and the optical fiber 1 is directly connected to the lens 3, making it possible to realize a coupling that is strong against temperature fluctuations, shocks, etc. .

As explained above, in the method of coupling an optical fiber and a lens according to the present invention, after adjusting the far-infrared original fiber to the focal position of the lens, the 00.00.degree. This coupling method uses a laser beam to process the lens surface, and then inserts and fixes the optical fiber into the processed hole, so the coupling positioning accuracy is high, and the position remains stable against external forces such as temperature fluctuations and shocks. Less misalignment, therefore less coupling loss,
This enables coupling with less fluctuation in optical loss.

[Brief explanation of the drawing]

81m is a diagram showing an example of the combination state of the conventional optical 7 eyeper and lens, FIG. 2 (aJ, (1)) is an actual example of the present invention, and FIG. In the diagram shown, 0 1... optical fiber, 3... cylindrical lens, 8...
4 strong adhesive, 4... Reinforcement hanger ^, S... Far infrared light 7 Eyepa, 6...00. 7... Optical power meter, 8... Line monitor, 9... Fine movement table. Patent applicant Nippon Telegraph and Telephone Public Corporation Figure 1 Figure 2 (a) (b) Figure 8

Claims (1)

[Claims] The rays from the LJlt source are focused by a lens and cht
In a method of coupling an optical fiber and a lens to guide it into an optical fiber, the light beam incident on the lens is condensed by the lens, and the light beam emitted from the opposite side of the lens is focused on the moving table. The light is guided to a far-infrared optical fiber fixed to the far-infrared optical fiber,
After adjusting the position of the far-infrared optical fiber rt11 by the fine movement table so that the intensity of the light beam guided to the far-infrared optical fiber becomes maximum, the direction of the light beam guided to the far-infrared light 7 eyeper Guide a laser beam from the end of the far-infrared optical fiber in the opposite direction, process the lens tube by laser processing, form a 6F hole for fixing the optical fiber, and insert the optical fiber into this hole. A method for coupling an optical fiber and a lens, comprising the steps of relative positioning and fixing of the optical fiber and the lens.