JPH03259106A - Coupler for receptacle type photosemiconductor - Google Patents

Abstract

PURPOSE:To prevent a sleeve from damaging owing to the production of abrasion powder of the sleeve by making the sleeve of a material whose hardness is equal to or larger than that of a ferrule, fixing the sleeve to a receptacle housing made of a different material, and thus forming a receptacle. CONSTITUTION:The sleeve 19 is formed of a hardened material, such as zirconia ceramic and stainless steel, which is equal in hardness to or larger than the material of the ferrule ad united with a fitting part 17 by pressing, caulking, adhesion, etc., to form the receptacle. Then the ferrule is inserted into the sleeve 19 of the receptacle 20 ad united. Consequently, the production of the abrasion powder of the sleeve 19 is reduced in the insertion and extraction of the ferrule and the flawing of the outer peripheral surface of the sleeve 19 is reducible.

Description

[Detailed description of the invention]

[Field of Industrial Application] The present invention relates to a receptacle-type optical semiconductor coupler used for coupling a light emitting/receiving element and an optical fiber used in an optical communication device or the like. [Prior Art] An important requirement for optical communication devices is coupling between light emitting and light receiving elements and optical fibers. Therefore, optical couplers are classified into pigtail type, which is equipped with an optical fiber, and septacle type, in which an optical connector to which the optical fiber is connected can be attached and detached. In recent years, single-mode fibers have been developed for long-distance, large-capacity, and high-speed communications, and are becoming cheaper as demand increases. Since the core diameter of this single mode fiber is small, a pigtail type has been used rather than a receptacle type for attachment and detachment. However, in response to demands for smaller systems and lower costs, there has been an increasing demand for receptacle-type devices that can be coupled to single-mode fibers that allow for easy transmission path changes. Therefore, a conventional receptacle type optical semiconductor coupler will be explained using FIG. 2. The drawing is a cross-sectional view, and in the figure, 1 is a light-emitting element such as an edge-emitting semiconductor laser or a light-emitting diode, and 2 is a device that mounts this light-emitting element 1 and has a terminal for supplying current for operating the light-emitting element 1. package, 3 is light emitting element 1
This is a cap with a light-transmitting window for airtight protection. Reference numeral 4 denotes a lens, and although a gradient index lens is shown here, a convex lens or the like may also be used. Reference numeral 5 denotes a lens holder for this lens 4, to which the lens 4 is fixed by adhesive or solder, and the package 2 is further fixed by welding or the like. Reference numeral 6 designates a receptacle, which is provided with a sleeve 7 in the center of which is machined a precision hole of μ units, the inner end surface of the sleeve 7 serves as a stopper 8, and a connection screw 9 is cut on the outer periphery. Therefore, the light emitted from the light emitting element 1 and spread out is focused by the lens 4 and irradiated onto the point A on the same surface as the stopper 8. 10 is an optical connector, which has an optical fiber 11 fixed through the center and has a ferrule 12 whose outer shape is precisely machined;
A connection thread 13 is carved on the inside of the outer cylinder. The ferrule 12 of the optical connector 10 thus constructed is inserted into the sleeve 7 of the receptacle 6, the screw 13 of the optical connector 10 is screwed into the screw 9 of the receptacle 6, and the tip of the ferrule 12 is brought into contact with the stopper 8. A pressing spring (not shown) provided on the optical connector presses against the stopper 8 to hold the tip of the ferrule 12 in a fixed position, and to maintain stability even under the influence of vibrations and the like. In this state, the ferrule 12 is placed at point A where the light is focused on the light emitting element l.
Optical alignment is performed so that the centers of the tips of the optical fibers 11 coincide, and the contact surfaces of the lens holder 5 and receptacle 6 are fixed by YAG welding or the like to form an integral structure. [Problems to be Solved by the Invention] According to the prior art described above, when the optical fiber moves in the direction of the arrow as shown in FIG. 3, a coupling loss as shown in FIG. 4 occurs. For this reason, the sleeve is made of stainless steel and precision machined with a difference in diameter of about 1 μm from the ferrule to ensure reproducibility of attachment and detachment. Further, the material of the ferrule is usually stainless steel or zirconia ceramic. When the above-mentioned zirconia ceramic ferrule is repeatedly attached and detached from a stainless steel sleeve, there is a problem in that since zirconia ceramic is harder, abrasion particles from the sleeve are generated and damage the sleeve. . In addition, since 5US303 is used for the sleeve, the spot welding part will also be 5US303 when processing to make the body.
This may cause cracks to occur in the welded area. In addition, KOV, 5US304.5US630 for welding
There is also the problem that it becomes a difficult-to-cut material and is difficult to perform precision machining. [Means for Solving the Problems] The present invention has a lens holder that holds a lens, which has a light emitting element attached to one end thereof, a sleeve into which a ferrule of an optical connector is fitted to the other end, a stopper for the ferrule, and a screw for attaching the optical connector. In a receptacle-type optical semiconductor coupler in which a receptacle is fixed by welding or the like, the sleeve is made of the same material as the ferrule or a harder material, and the sleeve is integrally fixed to a receptacle housing made of a different material to form a receptacle. It is characterized by [Function] By molding the sleeve from a material that is the same as or harder than the ferrule, and fitting and fixing this sleeve into the fitting part formed on the receptacle housing, the receptacle housing and sleeve can be shaped as desired. The receptacle housing can be made of a material with excellent workability and weldability, and the sleeve can be made of a material with excellent wear resistance for the ferrule. [Example] An example of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view of the receptacle, and in the present invention, the light emitting element r'''1.
Since the lens 4, lens boulder 5, etc. are the same as those in the prior art example described in 10, a detailed explanation thereof will be omitted. In addition, the light "1; Actor 10 is the same as the conventional example described above,
The optical fiber 11 is passed through the center and fixed, and the external shape is precisely machined.
] - The material of the ferrule 12, which has a screw 13 for connection carved on the inside of the outer cylinder, the cover, and the rule, is made of stainless steel or zirconia ceramic. In the figure, 1.14 is a receptacle housing,

[There is a through hole 15 in the center of the connecting wall with the men's holder 5 facing the lens 4, and the inner surface of the connecting wall is a stopper 16, and the center of the through hole 15 in the same part as the stopper 16 At point A, the light emitted from the light emitting element 1 and spread out is the L lens 4.
The beam is narrowed down and irradiated. 17 is a fitting part into which the sleeve is fitted, 1) 3 is a screw for connecting the optical fiber 11, and the overall size is, for example, 5U5.
It is made of a material that has good workability and weldability, such as 303. 19 is a separate L7 three group, for example, Jirkogo,
The fitting part 174 is press-fitted or made of a hardened material such as Aceramink or Stain L/S, and is made of a material with a hardness equivalent to or harder than the material of the filter 12 mentioned above. The receptacle 20 is formed by fixing it with a metal or adhesive or the like to form a body. According to the above configuration, the ferrule 1 of the optical connector 10
2 is inserted into the sleeve 19 of the receptacle 20, and the tip of the ferrule 12 is brought into contact with the stopper 8 to be integrated. In this state, screw the screw 13 of the optical connector 0 on the screw 1 of the receptacle 20, perform optical alignment so that the center of the tip of the optical fiber 11 of the ferrule 12 coincides with point A, and mount the lens holder 5. The contact surfaces of the receptacle housing 14 and the receptacle housing 14 are fixed by YAG welding or the like to form an integral structure. [Effects of the Invention] According to the present invention described in detail above, a light emitting element is installed at the end of the lens holder, and an optical connector is installed at the other end. In an L-septacle-type optical semiconductor coupler, in which a sleeve into which the ferrule is fitted, a stopper for the ferrule, and an L-septacle having a screw for attaching the optical I connector are fixed by welding or the like,
If the sleeve is made of the same material as the ferrule or is made of a material with a higher hardness than the ferrule, the sleeve is fixed to the receptacle face piece made of a different material. This has the effect of reducing the generation of abrasion powder, reducing the possibility of damaging the outer circumferential surface of the sleeve, and eliminating the risk of lowering the joining accuracy of the optical connector. In addition, 1. The sleeve is manufactured separately from the receptacle facepiece,
By fixing them together afterwards, the sleeve part can be machined as a cylindrical body, which greatly improves the machining accuracy compared to the conventional all-in-one piece with a complicated shape. I will do it. In addition, it is possible to mold the receptacle housing with a material that is easy to weld to the lens holder and is easy to process, improving processing accuracy and making connections for welding the receptacle housing to the lens holder. This has the effect of greatly improving accuracy.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a fourth receptacle showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional example, FIG. The figure is a graph showing coupling loss. 1... Light emitting element 4... Lens 5... Lens holder 1, 0... Optical fiber 12... Ferrule 13... Screw 14... Receptacle housing 16... Stopper 17... Fitting part 8 - Screw - Sleeve 0 Receptacle

Claims (2)

[Claims] 1. A receptacle-type optical semiconductor combination in which a light emitting element is attached to one end of a lens holder that holds a lens, and a sleeve into which a ferrule of an optical connector is fitted to the other end, a ferrule stopper, and a receptacle with screws for attaching an optical connector are fixed by welding or the like. A receptacle-type optical semiconductor coupler, characterized in that the sleeve is made of the same or harder material than the ferrule, and the sleeve is integrally fixed to a receptacle housing made of a different material to form a receptacle. 2. 2. A receptacle-type optical semiconductor coupler according to claim 1, wherein the sleeve is made of zirconia ceramic or stainless steel hardened material.