JPH0815581A - Optical module - Google Patents

Abstract

(57) [Summary] [Purpose] The fiber fixing part is free from breakage and damage,
It is an optical module with a beautiful appearance. [Structure] An optical module in which an optical element used for optical communication or the like is optically coupled to an optical fiber 7 via a lens 5 or the like. A rigid cover 3 for covering the structure for fixing the optical fiber 7 is provided. The inner diameter of the cover 3 is larger than that of the fixing structure of the optical fiber 7, and has a size capable of forming a gap. An engagement portion is provided on the inner diameter of the cover 3. A cover fixing engagement structure 2 having an outer diameter corresponding to the inner diameter and meshing with the engagement portion is formed on the frame of the module case 1. The cover 3 is fixed to the cover fixing engagement structure 2, and the fixed portion of the optical fiber 7 is covered with the cover 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling device for a semiconductor laser and a single mode optical fiber, an optical module, an optical module case and the like.

[0002]

2. Description of the Related Art Conventionally, for example, in optical communication, an optical module in which an optical waveguide element such as a light source, a receiver, an optical amplifier, and an optical fiber as an information transmission medium are optically coupled is used. In such an optical module, it is important that the optical coupling between the optical waveguide and the optical fiber is performed with high efficiency and that the change with time is small. Therefore, in the assembly process of the optical module,
The module case is fixed as a structure by a thermal adhesive or laser welding. FIG. 3 is a diagram for explaining a conventional technique. FIG. 3A is a perspective view showing the module case 50, a rod lens 51, and an optical fiber 53 which are integrated, and FIG. 3B is a sectional view of the assembled state. Shows. Rod lens 51
The optical fiber 53 with the ferrule 52 is assembled and integrated with the fiber fixing component 54 using an adhesive.
As shown in FIG. 3, a hollow cylindrical protrusion is formed on the side surface of the module case 50. At the end face of the protrusion, position adjustment is performed in a plane perpendicular to the optical axis, and the rod lens 51 and the optical fiber 53 are aligned with the optical axis of the semiconductor laser by aligning the optical axes of the rod lens 51 and the optical fiber 53. It is fixed by welding.

Further, as another conventional example, there is a treatment of a fiber output section by a rubber cover 55 as shown in FIG.
The fiber 53 assembled as in the prior art example has a rubber cover 55 at the portion protruding from the module case 50.
And the ends are narrowed to prevent the fiber 53 from fluttering. Moreover, since the fiber 53 is not attached randomly from the opening at the end of the case 50 but is smoothly changed to the thickness of the fiber 53, the appearance is also cleanly treated.

[0004]

However, in the above-mentioned conventional example, since the optical fiber fixing portion serving as an input / output end of light is exposed from the module case, it is easy to receive an external force directly. In addition, the appearance was rough because the assembly part was exposed.

[0005]

SUMMARY OF THE INVENTION In the present invention, a protective cover is provided to cover a part exposed from the case with a space. At this time, the cover must be more firmly fixed to the case in order to let the force escape to the case when an external force acts on the cover. Therefore, a protective cover was assembled by fitting such as a fixing screw and a spline to the portion where the optical fiber is fixed, to secure the mechanical strength and adjust the appearance.

More specifically, the optical module of the present invention is an optical module in which an optical element used for optical communication or the like is optically coupled to an optical fiber via a lens or the like, and has a structure for fixing the optical fiber. Has a rigid protective cover that covers the inner diameter of the optical fiber and has a larger gap than the optical fiber fixing structure, is threaded, and has a structure that corresponds to this inner diameter and is a male screw for fixing the cover. It is characterized in that it is formed in the frame of the module case, the cover is screwed and fixed there, and the fixed portion of the optical fiber is covered with the cover.

An optical module in which an optical element used for optical communication or the like is optically coupled to an optical fiber via a lens or the like, and has a rigid protective cover for covering a structure for fixing the optical fiber. , Its inner diameter is larger than the optical fiber fixing structure, and a spline is provided, and a cover fixing spline structure having an outer diameter corresponding to this inner diameter is formed on the frame of the module case. The cover is fitted in and fixed to, and the fixed portion of the optical fiber is covered with the cover. Furthermore, an optical module in which an optical element used for optical communication or the like is optically coupled to an optical fiber through a lens or the like,
It has a rigid protective cover that covers the structure for fixing the optical fiber, its inner diameter is larger than the structure for fixing the optical fiber, and it has an engaging part, and has an outer diameter corresponding to this inner diameter. A cover fixing engagement structure that meshes with the engagement portion is formed on a frame of the module case, the cover is fixed to the frame, and the fixed portion of the optical fiber is covered with the cover.

The protective cover of the present invention is a rigid cover for covering a structure for fixing an optical fiber in an optical module in which an optical element used for optical communication or the like is optically coupled to the optical fiber through a lens or the like. And its inner diameter is larger than that of the optical fiber fixing structure,
An engagement portion is provided, and the engagement portion is fixed to a frame of a module case having an outer diameter corresponding to the inner diameter and a cover fixing engagement structure that meshes with the engagement portion.

The optical module case of the present invention is an optical module case in which an optical element used for optical communication or the like is optically coupled to an optical fiber through a lens or the like.
The frame of the optical module case is a rigid protective cover that covers the structure for fixing the optical fiber, and the engaging cover is provided so that its inner diameter is larger than that of the structure for fixing the optical fiber and a gap is formed. The cover fixing engagement structure having an outer diameter corresponding to the inner diameter of the optical module case is formed on the frame of the optical module case.

[0010]

[Embodiment 1] FIG. 1 is a view showing a first embodiment of the present invention well, and FIG. 1 (a) is a layout drawing when assembling a protective cover.
(B) is a cross-sectional view when the assembly is completed. The module case 1 is provided with a cylindrical step having a diameter larger than the outer diameter of the cylindrical projection 1a at the case connection portion of the cylindrical projection 1a for welding and fixing the fiber fixing component 8 prepared on the side surface of the module case 1. , A screw 2 is cut on its side surface. After fixing the fiber fixing component 8 in which the rod lens 5 and the optical fiber 7 with the ferrule 6 are integrated to the cylindrical protrusion 1a of the module case 1, the metal protective cover 3 is screwed into the protective cover fixing screw 2. Protective cover 3
Is formed to have sufficient strength. Optical fiber 7
The rubber cover 4 having the taper portion is finally fixed to the protective cover 3 by the claw portion 3a provided at the end of the cylindrical portion at the end portion of the protective cover 3 in order to cleanly treat the end portion from which the is taken out. .

With the above-mentioned structure, even if the optical fiber fixing portion serving as an input / output end of light is exposed from the module case 1 and is easily subjected to an external force directly, this portion has a sufficient strength, so that the light guide of the device is prevented. The optical coupling between the waveguide and the optical fiber 7 is not disturbed. Further, since the rubber cover 4 having the taper portion is covered, the appearance of the assembly portion is also clean.

[0012]

[Other Embodiments] FIG. 2 is a view showing a second embodiment of the present invention well. FIG. 2 (a) is a layout of the protective cover 9 when assembled, and the rubber cover 4 is the same as that of the first embodiment. (B) is a sectional view for explaining a fitting state when the protective cover 9 is assembled. Similar to the first embodiment, a cylindrical step having a diameter larger than the outer diameter of the cylinder is provided at the case connecting portion of the cylindrical projection 11a for welding and fixing the fiber fixing component 8 prepared on the side surface of the module case 11. , Prepare the spline 10 on the side surface thereof. As shown in FIG. 2B,
The protective cover 9 is provided with splines 12 corresponding to the splines 10 provided on the case 11. In order to process the end portion where the optical fiber 7 is taken out, the rubber cover 4 is finally fixed by the claw portion 9a provided on the cylindrical portion at the end portion of the protective cover 9. The same effects as those of the first embodiment are also obtained by this embodiment.

[0013]

As described above, according to the present invention, a screw or the like is provided on the side surface of the case, which is the exit of the optical fiber which is the input / output end of light, and the cover of metal or the like having sufficient strength is covered therewith. . Since the metal cover is firmly fixed with screws, even if an external force is applied to the optical fiber attachment part, the force can be released to the case, and the fiber fixing part will not break or cause optical coupling. Free from damaging damage. Also, without exposing the work traces that fixed the parts,
The appearance will be beautiful.

[Brief description of drawings]

1A and 1B are diagrams showing a first embodiment of the present invention, in which FIG. 1A is a layout diagram when a protective cover is assembled, and FIG. 1B is a sectional view when the assembly is completed.

2A and 2B are views showing another embodiment, FIG. 2A is a layout view when assembling a protective cover, and FIG. 2B is a cross-sectional view of a portion where a case and the protective cover are fixed when assembly is completed.

FIG. 3 is a diagram for explaining a conventional technique.

FIG. 4 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 1, 11 Module case 1a, 11a Protective cover cylindrical part 2 Protective cover set screw 3, 9 Protective cover 3a, 9a Protective cover claw part 4 Rubber cover 5 Rod lens 6 Ferrule 7 Optical fiber 8 Ferrule fixed part 10, 12 Spline

[Procedure amendment]

[Submission date] August 8, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (6)

[Claims] 1. An optical module in which an optical element used for optical communication or the like is optically coupled to an optical fiber through a lens or the like, and has a rigid cover for covering a structure for fixing the optical fiber, Its inner diameter is larger than the fixing structure of the optical fiber and has a gap, and is threaded, and a structure corresponding to the male screw for fixing the cover having an outer diameter corresponding to this inner diameter is formed on the frame of the module case, An optical module in which a cover is screwed and fixed there, and a fixed portion of the optical fiber is covered with the cover. 2. An optical module in which an optical element used for optical communication or the like is optically coupled to an optical fiber via a lens or the like, and has a rigid cover for covering a structure for fixing the optical fiber, Its inner diameter is larger than the optical fiber fixing structure, and a spline is provided, and a cover fixing spline structure having an outer diameter corresponding to this inner diameter is formed on the frame of the module case. An optical module in which a cover is fitted and fixed, and a fixed portion of the optical fiber is covered with the cover. 3. An optical module in which an optical element used for optical communication or the like is optically coupled to an optical fiber via a lens or the like, and has a rigid cover for covering a structure for fixing the optical fiber, The inner diameter of the cover is larger than that of the optical fiber fixing structure, an engaging portion is provided, and the cover fixing engaging structure that has an outer diameter corresponding to this inner diameter and meshes with the engaging portion of the module case is An optical module comprising a frame, a cover fixed to the frame, and a fixed portion of an optical fiber covered with the cover. 4. The optical module according to claim 1, further comprising a rubber cover attached to a tip portion of the cover. 5. A protective cover for covering a structure for fixing an optical fiber in an optical module in which an optical element used for optical communication or the like is optically coupled to the optical fiber via a lens or the like, the inner diameter of which is a light cover. A frame of a module case in which an engaging portion is provided with a size larger than that of the fixing structure of the fiber, and an engaging structure for fixing the cover that has an outer diameter corresponding to the inner diameter and meshes with the engaging portion is formed. Protective cover that is fixed to. 6. An optical module case in which an optical element used for optical communication or the like is optically coupled to an optical fiber via a lens or the like, and a frame of the optical module case has a structure for fixing the optical fiber. Which has an outer diameter corresponding to the inner diameter of the protective cover in which the inner diameter of the protective cover is larger than that of the optical fiber fixing structure and the engaging portion is provided, and meshes with the engaging portion. An optical module case, wherein a cover fixing engagement structure is formed on a frame of the optical module case.