KR19990004648A - Manufacturing method of fiber pigtail for optical communication module - Google Patents

Abstract

The present invention relates to a fabrication method of a fiber pigtail for an optical communication module used as a light source in an optical communication system. A laser diode of a TO-CAN type installed in a center of an upper surface of the header to generate light used as a carrier; A first cylindrical shape surrounding a TO-CAN type laser diode and having one end surface coupled to the header; A fiber pigtail for an optical communication module having a metal cylinder coupled to an opposite end surface of the first ferrule, and having a second ferrule interposed therebetween with a fiber for coupling the light scanned from the laser diode with an optical fiber. Sealing process is performed to combine the first ferrule and the header.

Description

Manufacturing method of fiber pigtail for optical communication module.

The present invention relates to an optical communication system, and more particularly, to a manufacturing method of a fiber pigtail for an optical communication module used as a light source in an optical communication system.

Recently, an optical communication system capable of transmitting input information to a wide band using light as a carrier has been put into practical use. In such an optical communication system, a fiber pigtail is used as a light source for converting an input electrical signal into an optical signal and outputting the optical signal. It is used.

1 is a cross-sectional view showing a fiber pigtail for an optical communication module according to the prior art, as shown, the fiber pigtail is a header (1) that serves as a support, and is installed on the header (1) A TO-CAN type laser diode 2 for generating a light source, a first cylindrical ferrule 3 installed on an outer circumferential surface thereof to protect the TO-CAN type laser diode 2, and the first It is installed on the ferrule 3, and consists of a second ferrule 5 having a fiber 4 for coupling the light transmitted from the laser diode 1 to the optical fiber.

In the above, the first ferrule 3 is welded and fixed with the header 1, and the second ferrule 5 is also welded and fixed with the first ferrule 3.

However, the conventional fiber pigtail for the optical communication module as described above combines the first ferrule and the header through a welding process, resulting in a long overall process time and a poor appearance. In addition, since the welding process is a process of joining a specific point in the interface between dissimilar materials, the coupling force of the fiber is changed when the first ferrule fixed from the outside is weak because the fixing force of the first ferrule fixed on the header is weak. There was a problem that the reliability of the fiber pigtail is reduced.

Accordingly, the present invention is to couple the first ferrule on the header, but by fully coupling them through a sealing process, it is possible to increase the holding force of the first ferrule and to prevent the coupling efficiency of the fiber from being changed. An object of the present invention is to provide a method of manufacturing a fiber pigtail for an optical communication module.

1 is a view for explaining a fiber pigtail for an optical communication module according to the prior art.

2 and 3 are views for explaining a manufacturing method of a fiber pigtail for an optical communication module according to an embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

11: header 12: laser diode in the form of a TO-CAN

13: Ferrule 1 14: Ferrule 2

15: fiber

The above object is a header serving as a support; A laser diode of a TO-CAN type installed in a center of an upper surface of the header to generate light used as a carrier; A first cylindrical shape surrounding a TO-CAN type laser diode and having one end surface coupled to the header; A fiber pigtail for an optical communication module having a metal cylinder coupled to an opposite end surface of the first ferrule, and having a second ferrule interposed therein with a fiber for coupling the light scanned from the laser diode with an optical fiber.

It is achieved by a fiber pigtail fabrication method for an optical communication module according to the present invention, characterized in that the sealing process is carried out to couple the first ferrule and the header.

According to the present invention, by coupling the header and the first ferrule through the sealing process, it is possible to prevent the fiber coupling from twisting, thereby improving the coupling efficiency.

(Example)

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

2 and 3 are views for explaining a manufacturing method of a fiber pigtail for an optical communication module according to an embodiment of the present invention. First, referring to FIG. 2, a carrier wave is used on a header 11 serving as a support. The laser diode 12 of the TO-CAN type for generating the light is provided. Here, the laser diode 12 of the TO-CAN type is a form in which the laser diode is surrounded by a metal can, and a ball lens for collecting light emitted from the laser diode and irradiating the fiber to the center of the upper surface of the metal can is provided. The ball lens is attached to the metal can through a Hermatic sealing process that couples dissimilar materials by applying or removing pulse waves while increasing contact resistance between dissimilar materials.

Subsequently, the laser diode 12 of the TO-CAN type is covered by a first cylindrical ferrule 13 having a metal cylinder with a through hole for passing the light scanned from the laser diode. The interface between the headers is joined by a sealing process using a projection sealer. Here, as a method for coupling the first ferrule 13 and the header 11, a welding process for coupling only a predetermined number of specific contacts among their interfaces is conventionally performed. Since the process is carried out, the first ferrule 13 is more reliably fixed on the header 11, whereby the optical axis of the light generated from the laser diode is shaken due to external stress, resulting in a decrease in the coupling efficiency of the fiber. Can be prevented and aesthetically clean bonds can be made.

Subsequently, referring to FIG. 3, a second ferrule 14 having a through hole communicating with the through hole thereof is provided on the first ferrule 13, and the first ferrule 13 is installed inside the second ferrule 14. A fiber 15 is installed at the end of the through hole to couple the light transmitted from the laser diode to the optical fiber. Here, the second ferrule 14 and the fiber 15 are subjected to a welding process using a laser in a state in which they are aligned on the upper surface of the first ferrule 13 so that the light scanned from the laser diode reaches the fiber accurately. It is coupled to the upper surface of the first ferrule 13.

As described above, the manufacturing method of the fiber pigtail for the optical communication module of the present invention through the sealing process of the header installed with the laser diode of the TO-CAN type and the first ferrule installed to protect the TO-CAN type laser diode. By coupling, the fixing force between the header and the first ferrule can be increased, thereby preventing the fiber coupling efficiency caused by external stress from being lowered, thereby improving the reliability of the fiber pigtail.

Meanwhile, although specific embodiments of the present invention have been described and illustrated, modifications and variations can be made by those skilled in the art. Accordingly, the following claims are to be understood as including all modifications and variations as long as they fall within the true spirit and scope of the present invention.

Claims (2)

A header serving as a support; A laser diode of a TO-CAN type installed in a center of an upper surface of the header to generate light used as a carrier; A first cylindrical shape surrounding a TO-CAN type laser diode and having one end surface coupled to the header; A fiber pigtail for an optical communication module having a metal cylinder coupled to an opposite end surface of the first ferrule, and having a second ferrule interposed therein with a fiber for coupling the light scanned from the laser diode with an optical fiber. And a sealing process for coupling the first ferrule and the header to fabricate a fiber pigtail for an optical communication module. The method of manufacturing a fiber pigtail for an optical communication module according to claim 1, wherein said sealing step is performed using a projection sealer.