KR0151083B1 - Laser diode modulepackage - Google Patents

Abstract

According to the invention, the main body 31; A plurality of leads; A laser light generation laser diode 33; A laser light focusing lens 34; An isolator 35; Pigtail 36; An optical fiber 39; A sleeve member 38; In a laser diode module package having a spacer member 37 disposed between an end of the pigtail 36 and an end 40 of the body 31, the spacer member 37 has one end 41. ) Is a convex curved surface and the other end 42 is a hollow cylinder formed in a plane, and the curved surface of the sphere having a concave shape corresponding to the end 41 which is the curved surface of the spacer member 37 is A laser diode module package is provided, which is formed at the end 40 of the body 31. In the laser diode module package according to the present invention, the connection state of the pigtail to the main body can be controlled through a single spacer having an end of the sphere, so that the efficiency and quality of product production can be improved.

Description

Laser Diode Module Package

1 (a) is a plan view of a laser diode module package according to the prior art.

FIG. 1 (b) is a front sectional view of the package shown in FIG. 1 (a).

2 (a) is a perspective view of a spacer of the prior art.

FIG. 2 (b) is a plan view and a front view of FIG. 2 (a).

3 is a front cross-sectional view of a laser diode module package according to the present invention.

4 is a front and side cross-sectional view of a spacer according to the present invention.

* Explanation of symbols for main parts of the drawings

11: body 12: lead

13: laser diode 16: pigtail (pigtail)

17: spacer 18: sleeve

31 body 33 laser diode

36: Pigtail 37: spacer

The present invention relates to a laser diode module package for an optical communication, and more particularly to a spacer of a novel type that can be easily performed to align the body and the pigtail part by adjusting the angle and length of the optical axis. A laser diode module having a spacer is provided.

The laser diode module package is a device that generates a package optical signal through the package diode according to the input and output of the electrical signal, and delivers it through the optical fiber. The optical signal generated by the laser diode is focused step by step through an optical system including a lens and the like, and is transmitted to the optical fiber fixed at a predetermined angle by a pigtail. The coupling angle of the pigtail to the module package in the delivery of laser light generated from the laser diode serves as an important parameter in the transmission of the optical signal. This is because the coupling loss occurs because of the optical nature of the laser, which is outside the optimum coupling angle. In general, the coupling angle of the pigtail to the package body is adjusted using a spacer, and when the adjustment of the coupling angle is completed, the pigtail is fixed by YAG welding.

1 (a) and 1 (b) show a plan view and a front sectional view of a laser diode module package according to the prior art, respectively. The laser diode module package 10 is provided with a laser diode 13, a first lens 14 and an isolator 15 inside the package main body 11, and a pigtail at the end of the main body 11; (pigtail, 16) is connected. The pigtail 16 is assembled with a second lens and ferrule (not shown) together with the optical fiber 19. A plurality of leads 12 are provided outside the main body 11, and electrical signals input and output through the leads 12 generate laser light from the laser diode 13. The laser light is primarily focused by the first lens 14 to form parallel light, and the isolator 15 prevents the laser light from being reflected back.

The pigtail 16 is connected to the end of the main body 11 in a state coupled to the inside of the sleeve 18. In order to connect the pigtail 16 to the end of the main body 11, it is necessary to adjust the optical axis so as to exhibit the maximum efficiency in laser light transmission. As can be seen from the figure, the pigtail 16 is connected while being inclined at a predetermined angle with respect to the main body 11. As a means for maintaining the inclination, a spacer 17 as shown in Fig. 2A is used. The spacer 17 is in the form of an arc cut from a ring having a predetermined thickness at a predetermined angle, and is inserted between the end of the package body 11 and the end of the sleeve 18. Since the connection strength of the pigtail 16 is a very sensitive variable for the sensitivity characteristic of optical communication, various kinds of spacers 17 having different thicknesses and angles are used.

In the spacer 17 which is conventionally used in the prior art, two kinds of angles (0) of 45 degrees and 90 degrees of the arc shown in FIG. 2 (b) are used, and thickness of 0.01 mm to 0.2 mm for each angle is used. Six spacers are used. In actual use of spacers, a number of spacers are inserted between the ends of the body and the sleeves so as to obtain the required connection angle. When the angle adjustment of the pigtail 16 is completed, YAG welding is performed to fix the pigtail.

As described above, the laser diode 13, the first lens 14, and the pigtail 16 constitute a series of optical systems, in which the sensitivity characteristics may vary according to each position variation. Therefore, it takes considerable time to adjust the position between these elements, and the coupling loss occurs even in the displacement of the optical axis generated during the welding process after the adjustment. Due to these effects, there is a problem that the temperature characteristics and reliability of the product are lowered, and the cost is increased due to the manufacture of a large amount of spacers, productivity is improved by automatic assembly, and uniformity and stabilization of characteristics are difficult.

The present invention has been made to solve the above problems, an object of the present invention is to provide a laser diode package module that is easy to adjust the connection state of the pigtail to the main body.

Another object of the present invention is to provide a laser diode package module having a novel spacer so that the connection state of the pigtail to the main body can be easily adjusted.

Another object of the present invention is to provide a laser diode package module having an integrated spacer.

It is another object of the present invention to provide a laser diode package module having a novel sleeve which is easy to adjust the connection state of the pigtail to the main body.

In order to achieve the above object, according to the present invention, the main body; A plurality of leads for inputting and outputting electrical signals; A laser diode installed inside the main body to generate laser light according to the electric signal; A lens for connecting the laser light; An isolator for preventing retroreflection of the laser light; A pigtail connected to an end of the main body; An optical fiber whose end is fixed inside the pigtail; A sleeve member having the pigtail inserted therein; A laser diode module package having a spacer member disposed between an end of the pigtail and an end of the main body, wherein the spacer member is a convex shape of which one part is convex, the other end being a flat hollow As the cylindrical cylinder, there is provided a laser diode module package, wherein an end of a pigtail is inserted inside the hollow, and a curved surface of a sphere having a concave shape corresponding to the end of the spacer member is formed at the end of the main body. .

According to another feature of the invention, by changing the connection state of the end of the spacer to the end of the main body, it is possible to adjust the rotation angle and the inclination angle of the pigtail relative to the main body.

According to another feature of the invention, the hollow inner diameter of the spacer member is formed larger than the outer diameter of the pigtail, and by changing the contact state between the planar end of the spacer member and the end of the sleeve member in contact therewith The connection state of the pigtail on a plane perpendicular to the longitudinal direction of the pigtail may be adjusted.

According to another feature of the invention, the longitudinal connection state of the pigtail can be adjusted by moving the pigtail in the longitudinal direction with respect to the sleeve.

According to another embodiment of the invention, the main body; A plurality of leads for inputting and outputting electrical signals; A laser diode installed inside the main body to generate laser light according to the electric signal; A lens for focusing the laser light; An isolator for preventing retroreflection of the laser light; A pigtail connected to an end of the main body; An optical fiber whose end is fixed inside the pigtail; A sleeve member having the pigtail inserted therein; In a laser diode module package having a spacer member disposed between an end of the pigtail and an end of the main body, the spacer member has one end thereof in the form of a plane and the other end thereof as a curved surface of a concave sphere. A hollow cylinder formed, wherein an end of the pigtail is inserted into the hollow, and a curved surface of a sphere having a convex shape corresponding to the end of the spacer member is formed at the end of the sleeve member. Packages are provided.

According to another feature of the invention, by changing the connection state of the sleeve member to the end of the spacer member, it is possible to adjust the rotation angle and the inclination angle of the pigtail relative to the main body.

Hereinafter, the present invention will be described in more detail with reference to an embodiment shown in the accompanying drawings.

3 is a front cross-sectional view of a laser diode package module according to the present invention. The diode package module 30 has a laser diode 33, a first lens 34, and an isolator 35 installed inside the pigtail 31 in the main body 31. On the outside, a plurality of leads for inputting and outputting electric signals are provided. The sleeve 38 is coupled to the outside of the pigtail 36 fixed to the end of the optical fiber 39, the pigtail 36 and the sleeve 38 is capable of relative movement in the longitudinal direction.

According to the present invention, the spacer 37 coupled to the outer end of the pigtail 36 has a curved surface which is part of a sphere, as shown in FIG. 4, and the other end ( 42 is a hollow cylinder having a plane. The end portion 41, which is in the form of a curved surface, preferably has the shape of a hemisphere. The curved end 41 of the spacer 37 is coupled to the end 40 of the package body 31. The end of the package body 31 has a concave spherical curved shape corresponding to the curved end 41 of the spacer 37. Therefore, the spacer 37 may be connected to the package body 31 at any angle within a predetermined range. Preferably, the hollow inner diameter of the spacer 37 is larger than the outer diameter of the pigtail 36, and the pigtail 36 may move in the radial direction in the hollow of the spacer 37.

Assembly of the pigtail 36 to the package body 31 is performed as follows. First, the laser diode 33, the first lens 34, the isolator 35, and the like are assembled to the package body 31, and the spacer 37 is coupled to the end portion 40 of the package body 31. In addition to the above, the sleeve 38 is fitted to the outside of the pigtail 36 assembled with the optical fiber 39, ferrules and the like. Next, the end of the pigtail 36 is inserted into the spacer 37. As shown in FIG. 3, the end of the sleeve 38 is in contact with the planar end 42 of the spacer 37.

After the pigtail 36 is inserted into the hollow of the spacer 37, the connection state of the pigtail 36 is adjusted. The connection state adjustment with respect to the plane perpendicular to the longitudinal direction of the pigtail 36 is possible by adjusting the contact state between the planar end 42 of the spacer 37 and the end of the sleeve 38. That is, since the pigtail 36 can move inside the hollow of the spacer 37, it can be adjusted by changing the contact surfaces between the spacer 37 and the ends of the sleeve 38 to be offset from each other. In addition, adjustment of the connection state of the pigtail 36 with respect to the longitudinal direction is attained by moving the pigtail 36 in the longitudinal direction using the sleeve 38 as a guide. The rotation of the pigtail 36 relative to the body 31 and the adjustment of the inclination angle of the pigtail 36 relative to the body 31 are the spherical end 40 of the body 31 and the spherical shape of the spacer 37. It becomes possible by changing the contact state between the edge parts 41 mutually.

When adjustment of the optical alignment state of the pigtail 36 with respect to the main body 31 is completed as above, YAG welding is performed primarily between the spacer 37 and the sleeve 38. FIG. Thereafter, YAG welding is performed secondly between the sleeve 38 and the pigtail 36. Welding between the sleeve 38 and the pigtail 36 is through a separate hole formed in the sleeve 38. After the above primary and secondary welding is made, the welding between the spacer 36 is made through a separate hole formed in the sleeve 38. After the above primary and secondary welding is made, the connection of the pigtail is completed by performing final TAG welding between the spacer 36 and the end portion 40 of the main body 31.

Although not shown in the drawings, as an embodiment of the present invention, one end of the sleeve may be formed in a spherical surface. In this embodiment, the end of the spacer connecting to the end of the body is formed in a plane, and the end of the spacer in contact with the sleeve has a curved surface of the sphere in a concave shape. The end of the sleeve connecting with the concave curved end of the spacer has the curved surface of the sphere as a corresponding convex shape. Pigment connection angle adjustment and rotation state adjustment are made possible by adjusting the connection state of the sleeve to the spacer.

In the diode module package according to the present invention, the connection state of the pigtail to the main body can be adjusted very easily and accurately through a single spacer having a spherical end, thereby improving the efficiency and quality of product production. In addition, the use of a new spacer, which is easier to handle than a conventional spacer, it is possible to automate the production of the product and improve the productivity through it. In addition, the sensitivity characteristics of the optical communication can be uniform and stabilized, there is an advantage that the optical loss is minimized.

Claims (6)

A main body 31; A plurality of leads for inputting and outputting electrical signals; A pigtail diode 33 installed inside the main body 31 to generate laser light according to the electric signal; A lens 34 for focusing the pigtail light; An isolator (35) for preventing back reflection of the pigtail light; A pigtail (36) connected to an end portion (40) of the body (31); An optical fiber (39) whose ends are fixed inside the pigtail (36); A sleeve member 38 into which the pigtail 36 is inserted; In a pigtail diode module package having a spacer member 37 disposed between an end of the pigtail 36 and an end 40 of the body 31, the spacer member 37 has one end thereof. The convex shape 41 is a curved surface of a sphere, and the other end 42 is a hollow cylinder formed in a plane, and the end of the pigtail 36 is inserted inside the hollow, and the curved surface of the spacer member 37 is formed. A laser diode module package, characterized in that a curved surface of a sphere having a concave shape corresponding to the end portion (41) is formed at the end portion (40) of the body (31). The rotation of the pigtail 36 relative to the main body 31 according to claim 1, by changing the connection state of the end 41 of the spacer 37 to the end 40 of the main body 31. Laser diode module package, characterized in that the adjustable angle and tilt angle. 2. The sleeve according to claim 1, wherein the hollow inner diameter of the spacer member 37 is larger than the outer diameter of the pigtail 36, and the sleeve 42 is in contact with the planar end 42 of the spacer member 37. By changing the contact state between the ends of the member 38, the connection state of the pigtail 36 in a plane perpendicular to the longitudinal direction of the pigtail 36 can be adjusted. . The laser diode module package according to claim 1, wherein the longitudinal connection state of the pigtail (36) can be adjusted by moving the pigtail (36) in the longitudinal direction with respect to the sleeve (38). A main body 31; A plurality of leads for inputting and outputting electrical signals; A laser diode (33) installed inside the main body (31) to generate laser light in accordance with the electrical signal; A lens (34) for focusing the laser light; An isolator (35) for preventing retroreflection of the laser light; A pigtail (36) connected to an end portion (40) of the body (31); An optical fiber (39) whose ends are fixed inside the pigtail (36); A sleeve member 38 into which the pigtail 36 is inserted; In a laser diode module package having a spacer member 37 disposed between an end of the pigtail 36 and an end 40 of the body 31, the spacer member 37 has one end 41. ) Is a planar shape, and the other end 42 is a hollow cylinder formed of a curved surface of a concave sphere. The end of the pigtail 36 is inserted into the hollow and is a curved surface of the spacer member 37. A laser diode module package, characterized in that a curved surface of a sphere having a convex shape corresponding to an end portion (42) is formed at an end portion of the sleeve member (38). The angle of rotation of the pigtail 36 with respect to the body 31 by changing the connection state of the sleeve member 38 to the end 42 of the spacer member 37. Laser diode module package, characterized in that the inclination angle can be adjusted.