JPH0429208A - Semiconductor laser module - Google Patents

Abstract

PURPOSE:To reduce the number of parts and the man-hour of assembling by constituting a radiant light coupling means, which is provided between a laser diode and a ferrule, of a short-sized ferrule through which a specific coupling optical fiber is inserted. CONSTITUTION:A coupling optical fiber 11 whose one end facing a laser diode 17 is worked into a spherical surface is incorporated in a short-sized ferrule 12 centered with a high precision, and this ferrule 12 is inserted through a receptacle 14, and the other end of the coupling fiber 11 is optically ground together with the end face of the short-sized ferrule 12. One end face of the ferrule 16 incorporating the optical fiber 15 is worked into the spherical surface, and the ferrule 16 is inserted through the receptable 14 so that it is physically brought into contact with the short-sized ferrule 12. Thus, the number of parts and the man-hour of assembling are reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a semiconductor laser module for optical communication, and in particular, to a semiconductor laser module for optical communication, which efficiently couples a semiconductor laser diode and an optical fiber, and makes it possible to attach and detach the optical fiber. Semiconductor laser module.

[Conventional technology]

2. Description of the Related Art Conventionally, a removable connector type semiconductor module has been known as a means for connecting removable optical fibers in optical transmission devices, input/output terminals, etc. of optical communication systems.

FIG. 3 shows the structure of such a conventional connector-removable semiconductor module.

A ferrule 3 containing an optical fiber \2 is inserted into the receptacle 1. Emitted light 5 from the laser diode 4 is coupled to the optical fiber 2 by a lens 6 via a glass spacer 7. The end face of this optical fiber 2 is processed into a spherical shape. The glass spacer 7 is a means for preventing reflected light from reaching the laser diode 4 at the end face of the optical fiber, and is formed so that one end facing the incident side of the emitted light is inclined with respect to the optical axis.

Further, the other end of the glass spacer 7 and the end face of the optical fiber 2 are in physical contact.

[Problem to be solved by the invention]

By the way, the conventional connector-removable semiconductor module described above requires a lens 6 for coupling the emitted light from the laser diode 4, a glass spacer 7 for preventing reflection of the emitted light, and a means for holding the glass spacer 7. . Therefore, the number of parts increases and the glass spacer 7
It takes a lot of man-hours to process the end face so that it is inclined with respect to the optical axis, and the cost is relatively high.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a semiconductor module that can reduce the number of parts and man-hours, thereby reducing costs.

[Means to solve the problem]

The present invention provides a connector-removable semiconductor laser module that integrates a laser diode, means for coupling emitted light from the laser diode, and a receptacle in which a ferrule containing an optical fiber can be attached and detached. and a coupling optical fiber whose one end facing the laser diode is processed into a spherical shape and whose other end is in physical contact with the end face of the optical fiber inside the ferrule, and It is constructed with a short ferrule in which a fiber is housed, thereby reducing the number of parts and the number of assembly steps, thereby achieving the above object.

〔Example〕

Embodiments of the present invention will be described below with reference to FIG.

In FIG. 1, a coupling optical fiber 11 having a spherical tip, one end facing the laser diode side being processed into a spherical shape, is housed in a precisely centered short ferrule 12, and is held in a receptacle 14 by a holding means 13. Decorated. The other end of this coupling fiber 11 is optically polished together with the end surface of the short ferrule 12.

Further, one end surface of the ferrule 16 containing the optical fiber 15 is processed into a spherical shape, and is inserted into the receptacle 14 so as to be in physical contact with the end surface of the short ferrule 12. The laser diode 17 is housed in a laser diode package 18, and emitted light from the laser diode 17 is coupled to the optical fiber 15 via the coupling fiber 11.

Thus, the emitted light from the laser diode 17 is coupled to the optical fiber 15 via the coupling fiber 11, but in this case, the coupling fiber 11 and the optical fiber 15, which are in physical contact, connect the laser diode 17. The reflected light of the emitted light from the laser diode 1
7 is prevented from reaching 7.

Therefore, according to the connector-removable semiconductor module of this embodiment, it is possible to omit the conventionally required lens for coupling the emitted light, and the glass spacer for preventing the reflection of the emitted light is also unnecessary.

Therefore, the holding means for the glass spacer can be omitted, and the number of parts can be reduced accordingly. Extra processing such as tilting the end face of the glass spacer with respect to the optical axis can also be omitted, making it possible to reduce the number of man-hours, resulting in lower costs. can be achieved. In addition,
Compared to an optical system using a conventional coupling lens, it is possible to shorten the optical length, and there are also advantages such as contributing to miniaturization of a connector-attached semiconductor module.

In the above embodiment, the short ferrule 12, the receptacle 14, the means for connecting the laser diode punch, etc. were configured to have a wide degree of freedom, but as shown in FIG. The diode package 18 and the receptacle 14 are fixed by the fixing means 1.
It is desirable to fix it by a welding part 20 for YAG laser welding via a welding part 9 . According to such a configuration, in addition to the above-mentioned effects, advantages such as improved coupling efficiency can be obtained.

[Effects of the Invention] As explained above, according to the present invention, by providing a coupling fiber with a spherical tip and bringing the coupling fiber and the optical fiber into physical contact,
It becomes possible to omit the coupling lens, the glass spacer, the means for holding the glass spacer, etc., thereby reducing the number of parts and assembly man-hours, resulting in effects such as cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a semiconductor module according to the present invention, FIG. 2 is a sectional view showing another embodiment of the present invention,
FIG. 3 is a sectional view showing a conventional semiconductor module. 11 Coupling fiber 12 Short ferrule 13 Support means 14 Receptacle 15 Optical fiber 16 Ferrule 17 Laser diode 18 Laser diode package 19 Fixing means 20 Welding part

Claims (1)

[Claims] In a connector-removable semiconductor laser module that integrates a laser diode, a coupling means for emitted light from the laser diode, and a receptacle in which a ferrule containing an optical fiber can be attached and detached, there is provided a receptacle between the laser diode and the ferrule. The coupling means for synchrotron radiation provided in the ferrule includes a coupling optical fiber whose one end facing the laser diode is processed into a spherical shape and whose other end is in physical contact with the end face of the optical fiber inside the ferrule, and this coupling optical fiber is installed inside the ferrule. A semiconductor laser module comprising: a short ferrule; and a short ferrule.