JP2003295001A - Optical communication module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical communication module which is easily mounted on a system or the like and can cope with a reflow mounting and has a high optical coupling characteristic and high reliability. <P>SOLUTION: The optical communication module is provided with a receptacle type module package part A incorporating a light receiving element 8a or a light emitting element and an optical lens 7 and a ferrule guide part B which is fixed to the module package part and incorporates a structure having an optical fiber 1 with a ferrule for relay, which has an optical communication fiber 1c optically connectable to the light receiving element or the light emitting element in the center part, inserted therein from one end side of a split sleeve 3, and a ferrule 14b attached to the front end of an optical fiber with a connector for leading in or out an optical signal is inserted to the other end side of the split sleeve of the ferrule guide part B when the optical communication module is used. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical communication module, and more particularly to a structure for optically coupling an internal light receiving element or a light emitting element to an optical communication fiber inserted from the outside, for example, an optical receiving module and an optical transmitting module. , Optical transmission / reception composite modules and the like.

[0002]

2. Description of the Related Art In recent years, optical communication modules have been rapidly increased in capacity and speed, and have been integrated into a composite module that integrates transmission and reception and have been reduced in size. It has become mandatory.

On the other hand, in terms of reliability and economy, market demands are strict, and high reliability and low price products are required. This is due to the spread of advanced information networks as seen in the present Internet, and it is required to provide high-speed and large-capacity communication services at lower prices. Further, these communication networks are required to have high reliability because they will have a large-scale social impact if they are cut off due to a failure or the like.

The optical communication module, which is an important key device in optical communication, includes an optical receiving module for converting an optical signal into an electric signal and an optical transmitting module for converting an electric signal into an optical signal. Composite and miniaturized composite modules have been developed, such as transceiver modules that have both receivers.

Such optical communication modules are roughly classified by focusing on the structure of optical coupling. (1) A pigtail type optical fiber in which an optical fiber for guiding an optical signal is fixed (mounted) in advance, (2) There is a receptacle type in which an optical fiber with a connector is inserted and used at the time of use without fixing the optical fiber in advance.

(1) Regarding a pigtail type optical communication module.

In the structure of the pigtail type optical transmitter module, the laser light emitted from the laser diode LD is optically coupled to the core portion of the optical fiber in advance with high accuracy.

The structure of the pigtail type optical receiver module is fixed so as to collect an optical signal from an optical fiber on a light receiving portion of a photodiode PD which is a light receiving element with high accuracy.

As described above, the pigtail type module is optically coupled in advance with high accuracy.
Since it is firmly fixed by spot welding, laser welding, etc., it has an advantage that high reliability can be guaranteed.

However, the pigtail type optical communication module has a problem that it is difficult to automatically mount the module because the optical fiber is fixed in advance as described above. In addition, since high-quality optical fiber is coated with resin on the outside of the quartz fiber, it is vulnerable to heat, and it is difficult to perform reflow mounting using a reflow furnace with other parts, and manual mounting is required. is there.

On the other hand, in the current optical communication, a market of 10 Gbps has been established, and an optical communication module for 2.5 Gbps has a strict requirement for system price reduction while maintaining the conventional characteristics.

Therefore, in a situation where there is a strict demand for system price reduction while maintaining high speed, such as an optical communication module for 2.5 Gbps,
As described above, the pigtail type optical communication module is an obstacle to cost reduction.

(2) Receptacle type optical communication module.

Receptacle type optical communication is generally a fiberless module in which an optical fiber coated with a resin, which is weak against heat, is not fixed in advance. Since there is no problem like the pigtail type optical communication module described above, automatic mounting or Reflow mounting is possible.

However, when the optical communication module of the receptacle type is used by inserting an optical fiber with a connector at the time of use, the optical coupling accuracy depends on the mechanical precision, so that the coupling loss is high and the optical coupling accuracy (light receiving sensitivity) is high. Is not sufficiently obtained, and good optical coupling characteristics cannot be obtained.

In the present situation, the pigtail type optical communication module and the receptacle type optical communication module as described above are properly used by utilizing their respective characteristics. In other words, the pigtail type optical communication module with high optical precision is used for the part requiring high sensitivity and the part for high speed transmission, and the receptacle type optical communication module is used for the transmission at short distance. It is used for low-speed transmission and reception.

Next, the above-mentioned problems will be described in detail with reference to a conventional example of a receptacle type optical receiving module for 2.5 Gbps.

FIG. 8 (a) is a partially cut top view schematically showing the structure of a conventional receptacle type optical receiver module. FIG. 8B is an enlarged schematic sectional view of the structure of the ferrule guide portion in FIG. 8A.

FIG. 9 is a structural explanatory view schematically showing a state in which an optical fiber with a connector is optically coupled to the optical receiving module shown in FIG. 8 (a).

The receptacle connector shown in FIGS. 8 (a) and 8 (b) has a cylindrical connector fixing screw portion 5'having a fixing screw groove formed on the outer peripheral surface at one end side. A cylindrical split sleeve holding portion 2 is fixed inside the connector fixing screw portion 5 ′.
A split sleeve 3 and a cylindrical stopper metal 4 for preventing the split sleeve 3 for regulating the position of the split sleeve 3 in the lengthwise direction are incorporated inside.

Reference numeral 7 is a ball lens, 8a is a light receiving element, and 8b.
Is a carrier on which the light receiving element 8a is fixed and wiring for applying bias and extracting an electric signal to the light receiving element is performed. 9 is a substrate on which an electric circuit is formed. 10 is a TIA (transimpedance amplifier) for amplifying the electric signal. , 11 is a package body, 12 is an input / output pin for bias application or ground, and 13 is a glass sealing portion for insulating the input / output pin from the package body.

On the other hand, an optical fiber with a connector for introducing an optical signal is, as shown in FIG.
a, ferrule 14 attached to the tip of the optical fiber
b, a connector body 14c, a ferrule spring 14d for pushing out / maintaining fitting, a fixing screw portion 14e having a fixing screw groove formed on the inner peripheral surface, and a connector hood 14f.
The portion 14g of the ferrule end surface of the ferrule-equipped optical fiber, which has been polished, is the fixing screw portion 14.
Located in the center of e.

When using the above receptacle connector,
As shown in FIG. 9, when the fixing screw portion 5 ′ of the optical fiber with a connector is fitted to the connector fixing screw portion 5 ′, the ferrule 14 b is inserted into the split sleeve 3, and the ferrule 14 b is guided by the split sleeve 3. As a result, the ferrule end surface portion 14g advances to a position facing the ball lens 7 of the receptacle connector, and the optical coupling is enabled.

In this state, the optical signal transmitted by the optical fiber with a connector and emitted from the ferrule tip portion 14g passes through the ball lens 7 and the light receiving element 8a.
Is focused on. The electrical signal converted from the optical signal by the light receiving element 8a is input to the TIA 10, amplified, and output through the electrical circuit of the substrate 9.

The positional accuracy of the optical coupling shown in FIG. 9 is obtained by inserting a ferrule part using a standard optical fiber with a ferrule at the time of assembling the optical receiving module, and actually collecting the light to the light receiving element while inputting light. The light is fixed after being adjusted to have a desired characteristic.

However, the adjusting optical fiber and the optical fiber used in the actual system are not completely the same. Therefore, in actual use, a mechanical displacement of the optical fiber occurs, an optical coupling fixed during the adjustment is displaced, and the characteristics obtained during the adjustment may not be obtained.

That is, it is the split sleeve 3 and the split sleeve holding portion 2 that determine the direction of the light emitted from the ferrule tip portion 14g. However, since the split sleeve 3 needs some play inside the split sleeve holding portion 2 to guide the ferrule 14b, it cannot be manufactured with strict dimensional accuracy. If the optical axis is set precisely, the split sleeve 3 and the split sleeve holding portion 2
If the processing accuracy is increased, there is a possibility that problems may occur such as a case where fitting is not possible or the ferrule 14b is damaged. That is, the optical coupling to the space by the split sleeve 3 is
There is a problem with the guide method and it is unstable.

In order to prevent this, the optical coupling at the time of adjustment is not aimed at the maximum coupling sensitivity but is adjusted (defocus adjustment) so as to have a certain margin, and even if there is some mechanical precision variation, it is extremely extreme. It is common to fix the light by narrowing it down so that the characteristics do not deteriorate.

By performing such defocus adjustment, it is possible to realize an optical receiving module in which the optical coupling efficiency is not the maximum but a certain degree of characteristics can be obtained even for a connector having some dimensional variation.

As described above, the receptacle type optical receiver module can be easily mounted on a system,
Although it has the advantage of being compatible with reflow mounting, it has more optical coupling characteristics than the pigtail type optical receiver module.
At present, it is disadvantageous in terms of reliability and cannot fully utilize the above advantages.

[0031]

As described above, the conventional receptacle-type optical communication module is more disadvantageous than the pigtail-type optical communication module in terms of optical coupling characteristics and reliability, and has sufficient advantages. There was a problem that it could not be used.

The present invention has been made to solve the above-mentioned problems, and can be easily mounted automatically on a system or the like, can be adapted to reflow mounting, and has the advantage of the pigtail type, high optical quality. An object is to provide an optical communication module having coupling characteristics and high reliability.

[0033]

An optical communication module according to the present invention comprises a receptacle type module package portion having a light receiving element or a light emitting element and an optical lens built therein.
An optical fiber with a ferrule for relay, which is fixed to the module package part and has an optical communication fiber capable of being optically coupled to the light receiving element or the light emitting element in the central portion, is internally inserted from one end side of the split sleeve. At the time of use, a ferrule guide portion is provided on the other end side of the split sleeve into which a ferrule attached to the end of an optical fiber with a connector for introducing an optical signal or leading out an optical signal is inserted.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment> FIG. 1A is a partially cut top view schematically showing the structure of an optical receiver module according to a first embodiment of the present invention. FIG. 1B is the same as FIG.
It is sectional drawing which expands and shows the structure of the ferrule guide part in (a).

FIGS. 2 (a) and 2 (b) are a longitudinal sectional view and a transverse sectional view schematically showing the enlarged optical fiber with a ferrule for relay in FIG. 1 (b).

FIG. 3 shows FIGS. 1 (a), 1 (b) and FIG.
It is a structure explanatory view which shows the state which optically couple | bonded the optical fiber with a connector with the optical receiving module shown to (a) and (b).

For example, 2.5 G shown in FIGS.
In the optical receiver module for bps, the ferrule guide part B is fixed to the module package part A.

In the ferrule guide portion B, a flange portion of a cylindrical holder 6 with a collar is fixed to the module package portion, and a cylindrical connector fixing screw portion having a fixing screw groove formed on the outer peripheral surface. 5 is fitted to the outside of the cylindrical portion of the holder 6, the connector 6 is attached to the holder 6 with the screw portion 5
Is fixed.

A cylindrical split sleeve holding portion 2 is fixed inside the holder 6, and inside the split sleeve holding portion 2, the split sleeve 3 and a cylinder for regulating the position in the lengthwise direction thereof. The stopper 4 for preventing falling off is incorporated.

Further, in this embodiment, as shown in FIG.
The optical fiber 1 with a ferrule for relay as shown in (b) is near the middle of the inside of the split sleeve 3 (almost the central position).
Is arranged so as to pass through the inside of the stopper metal 4 for preventing falling and to face an optical lens (for example, a ball lens) 7 of the module package portion A described later, and is fixed by the stopper 4 for preventing cap. ing.

Optical fiber 1 with ferrule for this relay
Has a structure in which an optical fiber (eg, quartz fiber) 1c is passed through a ceramic sleeve 1b, and the outer side is surrounded by a cylindrical metal pipe (metal ferrule) 1a,
These are fixed with an adhesive resin or the like.

Then, the end faces 1d and 1e of the optical fiber 1 with a ferrule for relay are subjected to polishing treatment necessary for optical coupling, and have optical characteristics of low loss and low reflection.

The internal structure of the module package part A is
The same as the conventional example described above with reference to FIG. 8A, the ball lens 7, the light receiving element 8a, the carrier 8b in which the light receiving element 8a is fixed and the wiring for bias application and the electric signal extraction are formed, A substrate 9 on which a circuit is formed,
It has a TIA (transimpedance amplifier) 10 for amplifying electric signals, a package body 11, an input / output pin 12 for bias application or ground, a glass sealing portion 13 for insulating the input / output pin from the package body, and the like.

On the other hand, the optical fiber with a connector for introducing an optical signal is the same as that of the conventional example described above with reference to FIG. 9. The optical fiber 14a, the ferrule 14b attached to the tip of the optical fiber, and the connector body 14c. , A ferrule push-out / fitting spring 14d, a fixing screw portion 14e having a fixing screw groove formed on the inner peripheral surface, and a connector hood 14f. Then, a portion 14 of the ferrule end surface of the ferrule-equipped optical fiber that has been polished.
g is located at the center of the fixing screw portion 14e.

When using the above-mentioned optical receiver module, FIG.
As shown in FIG. 3, when the fixing screw portion 14e of the optical fiber with a connector is fitted into the connector fixing screw portion 5, the ferrule 14b is inserted into the split sleeve 3, and the ferrule 14b is guided by the split sleeve 3 and relayed. The optical fiber 1 with a ferrule for use is advanced to a position facing the end face portion at a close distance, and optical coupling is enabled.

In this state, the optical signal transmitted by the optical fiber with a connector and emitted from the ferrule tip portion 14g passes through the optical fiber with a ferrule for relay 1, passes through the ball lens 7, and is focused on the light receiving element 8a. It The electric signal converted from the optical signal by the light receiving element 8a is T
It is input to the IA, amplified, and output through the electric circuit of the substrate.

According to the above-described embodiment, the optical fiber 1 with the ferrule for relay is inserted from one end side of the split sleeve 3 and the other end of the split sleeve 3 in a state where optical coupling is possible as shown in FIG. Since the ferrule 14b of the optical fiber with a connector is inserted from the side, the split sleeve 3 is in a stable state, and the ferrule end face portion 14 is in a stable state.
g is an end face portion 1c of the optical fiber 1 with a ferrule for relay
Against, with a positional accuracy that is extremely low with mechanical deviation,
It is possible to maintain high precision optical coupling.

In this case, the structure from the relay ferrule-equipped optical fiber 1 to the module package portion A is the same as that of the conventional pigtail-type module pigtail portion, and the connector-equipped optical fiber ferrule 14b is used.
It is possible to adjust and fix the position of with high precision.

The structure from the optical fiber 1 with a ferrule for relay to the ferrule 14b of the optical fiber with a connector is the same as the mating structure of the optical connectors at the ends of the pigtail type module, and the optical coupling loss is small. It maintains the same level as the pigtail type module.

As described above, by using the pigtail type module structure for the optical coupling portion of the receptacle type module structure, a resin coating which is generally weak against heat is provided while having an optical system with high coupling sensitivity and high reliability. It is a structure in which the optical fiber is not directly fixed,
It does not have the problem of the above-mentioned pigtail type optical communication module, and can be applied to automatic mounting or reflow mounting.

Since the light-receiving portion of the light-receiving element is small in high-speed communication, it is possible to introduce the receptacle-type module in a field where it has been impossible to use the receptacle-type module in the past, and the cost is lower. It is possible to provide an optical communication system.

FIGS. 4A to 4H are shown in FIG.
It is sectional drawing which shows an example of the assembly process of the optical receiver module shown to (b) and FIG.2 (a), (b).

First, as shown in FIG. 4 (a), the fastener 4 is fixed to the optical fiber 1 with a ferrule for relay, and the parts shown in FIG. 4 (b) are assembled.

On the other hand, as shown in FIG. 4 (c), the split sleeve 3 is inserted into the split sleeve holding portion 2 to assemble the parts shown in FIG. 4 (d). In this case, the split sleeve 3 is not fixed but left free.

Next, the parts shown in FIG.
Inserting the part shown in (d) and fixing the fastener 4 to the split sleeve holding part 2, the split sleeve 3 can be moved in the length direction in the split sleeve holding part 2 as shown in FIG. 4 (e). Assemble the enclosed parts in this state.

Since the split sleeve 3 has a diameter smaller than that of the optical fiber 1 with a ferrule for relaying, the split sleeve 3 extends from the right side of the component shown in FIG. Optical fiber ferrule with connector for optical signal introduction along
It is possible to exactly match the fiber core portion 4b) with the fiber core portion 1c of the optical fiber 1 with a ferrule for relay and to face them.

Next, as shown in FIG. 4 (f), the components shown in FIG. 4 (e) are attached to the package body 11 of the module package portion A in which mounting of the light receiving element and the like is completed via the holder 6. Optically combine. In this optical coupling, like the pigtail type module, the holder 6 is moved so as to be in an optimum state (high coupling efficiency is obtained) while introducing an optical signal through the optical fiber 1 with a ferrule for relay. However, it can be adjusted in a plane perpendicular to the optical axis, and can also be adjusted in the optical axis direction. Then, in the optimum state described above, the package body 1
By fixing the holder 6 to 1 by laser welding or the like, a highly reliable optical coupling structure can be fixed.

Next, as shown in FIG. 4 (g), the holder 6
The inside of the threaded portion 5 for fixing the tubular connector is fitted to the outer side of the cylindrical portion of, and this state is fixed by laser welding or the like.
A module having a structure as shown in (h) is assembled.

In the above embodiment, as an example of the mechanical coupling structure of the optical receiver module and the optical fiber with connector, the screw portion 5 for fixing the connector is screwed with the screw portion 14e for fixing the connector of the optical fiber with connector. However, there are various types of optical connector structures at the moment, and there are types that can be fixed with one touch and types that can be inserted and removed. Further, most optical connectors employ a guide with a split sleeve, and the optical connector of the embodiment other than the above embodiments can be implemented by applying the present invention as long as the structure uses the split sleeve. Is.

Another example of the structure of the optical connector to which the invention is applied will be described below.

<Second Embodiment> FIGS. 5A and 5B show a structure and an optical fiber with a connector when the invention is applied to an angular one-action type optical connector generally represented by an SC type. It is a fragmentary sectional view showing roughly the structure of the state of mechanical coupling with.

The structure shown in FIGS. 5 (a) and 5 (b) is different from the structure described above with reference to FIGS. 1 to 3 in the vicinity of the tip of the guide portion 5a for fixing the connector of the optical receiving module. 1 to FIG. 3, since the structure is different in that the connector locking hook 5b is provided in the connector and the structure of the fitting portion 14e ′ of the optical fiber with connector is mainly different.
The same symbols as in the inside are attached.

Optical fiber fitting with connector 14e '
Is the guide portion 14 fixed to the connector body 14c.
A locking projection a is provided on the outer surface of h, and an inclined lock release part b is provided adjacent to the locking projection a.

When the connector portion of the optical fiber with a connector is inserted into the guide portion 5a of the optical receiving module from the state shown in FIG. 5A, the hook 5b is attached to the locking protrusion a.
Is locked and locked.

At this time, the ferrule tip portion 14g of the optical fiber with a connector is pressed against the end surface portion of the optical fiber with a ferrule 1 for relay, and the ferrule pushing-out / fitting maintaining spring 14d is compressed and its repulsive force is exerted. Thus, the ferrule tip portion 14g is firmly pressed against the end face portion of the optical fiber 1 with a ferrule for relay.

On the other hand, when the locked state is released from the state shown in FIG. 5 (b), the tilted unlocking portion b of the optical receiving module is pulled by pulling the connector portion of the optical fiber with connector to the right side in the drawing. Since the hook 5b is pushed upward in the drawing so that the hook 5b is not caught by the locking protrusion a, the guide portion 5 of the optical receiving module
It is possible to pull out the connector portion of the optical fiber with a connector from a.

<Third Embodiment> FIGS. 6A and 6B show a structure and an optical fiber with a connector when the invention is applied to a cylindrical double-action type optical connector generally represented by the ST type. It is a fragmentary sectional view showing roughly the structure of the state of mechanical coupling with.

The structure shown in FIGS. 6A and 6B is different from the structure described above with reference to FIGS. 1 to 3 in that the cylindrical guide portion 5c of the optical receiving module and the cylinder of the optical fiber with connector are used. Since the shape fitting portion 14e 'is mainly different and the other parts are almost the same, the same reference numerals as those in FIGS. 1 to 3 are given.

The cylindrical guide portion 5 of the optical receiving module
A protrusion 5d for connector locking is provided on the outer surface near the tip of c.
Is provided, and the fitting portion 1 of the optical fiber with connector
A J-shaped groove 14j is provided on the side wall of 4e 'along the axis.

From the state shown in FIG. 6A, when the optical fiber with connector is inserted into the cylindrical guide portion 5c of the optical receiver module so as to be fitted with the fitting portion 14e ', the projection 5d of the guide portion 5c is It is guided by the J-shaped groove 14j of the fitting portion 14e ', and is locked while being hooked near the wall surface of the J-shaped tip portion.

At this time, the ferrule tip portion 14g of the optical fiber with a connector is pressed against the end face portion of the optical fiber with a ferrule 1 for relay, and the spring 14d for pushing out the ferrule and maintaining the fitting is compressed, and its repulsive force is exerted. Thus, the ferrule tip portion 14g is firmly pressed against the end face portion of the optical fiber 1 with a ferrule for relay. By the repulsive force of the ferrule pushing-out / fitting-maintaining spring 14d, the tip wall surface of the J-shaped groove 14j of the fitting portion 14e 'is also pressed against the connector locking projection 5d. It can't come off.

On the other hand, when the locked state is released from the state shown in FIG. 6 (b), the fitting portion 14e 'should be slightly pushed to the left side (the insertion direction side) in the drawing and slightly rotated downward in the drawing. As a result, the protrusion 5d is prevented from being caught in the J-shaped groove 14j.
It is possible to pull out the fitting portion 14e 'of the optical fiber with connector.

<Fourth Embodiment> FIGS. 7 (a) and 7 (b) show a structure and an optical fiber with a connector when the invention is applied to a double-action type optical connector having a rectangular connector shape generally called LC type. It is a fragmentary sectional view showing roughly the structure of the state of mechanical coupling with a fiber.

The structure shown in FIGS. 7 (a) and 7 (b) is different from the structure described above with reference to FIGS. 1 to 3 in that the guide portion 5e for fixing the connector of the optical receiver module and the optical fiber with connector are used. Since the fitting portion 14e 'for fixing the connector is mainly different and the other parts are almost the same, the same reference numerals as those in FIGS.

A connector lock recess 5f is provided on the inner surface of the tip of the guide portion 5e of the optical receiving module, and a plate having a leaf spring structure is provided outside the fitting portion 14e 'of the optical fiber with connector. The plate-shaped lever 14k is provided with a connector locking protrusion 14m.

From the state shown in FIG. 7 (a), when inserting the fitting portion 14e 'of the optical fiber with connector into the guide portion 5e of the optical receiving module, the protrusion 14m of the plate lever 14k is recessed in the guide portion 5e. It is caught by the portion 5f and locked by the leaf spring mechanism.

At this time, the ferrule tip portion 14g of the optical fiber with connector is pressed against the end face portion of the optical fiber with ferrule 1 for relay, and the ferrule pushing-out / fitting spring 14d is compressed and its repulsive force is exerted. Thus, the ferrule tip portion 14g is firmly pressed against the end face portion of the optical fiber 1 with a ferrule for relay.

On the other hand, when the locked state is released from the state shown in FIG. 7B, the plate-shaped lever 14k is pushed down in the drawing to fit the fitting portion 14e of the optical fiber with connector.
By pulling out ′ to the right side in the drawing, the connector locking protrusion 14m comes out of the recess 5f of the guide portion 5e, so that the fitting portion 14e ′ of the optical fiber with connector is pulled out from the guide portion 5e of the optical receiving module. It will be possible.

In each of the above embodiments, the optical receiving module for optical communication is shown. However, in the case of the optical transmitting module for optical communication, the optical fiber with a ferrule for relay which is optically coupled with the light emitting element is also used in the above embodiment. By providing the same as above, high optical coupling and high reliability can be realized.

As an example of the above-mentioned optical transmission module, a receptacle type module package part having a light emitting element and a ball lens built therein, and an optical communication fiber fixed to the module package part and capable of being optically coupled to the light emitting element are provided at the center part. A built-in structure in which the optical fiber with a ferrule for relay has is inserted inside from one end side of the split sleeve, and is attached to the other end side of the split sleeve at the end of the optical fiber with a connector for guiding an optical signal when in use. And a ferrule guide part into which the ferrule is inserted.

With such a configuration, the optical signal generated from the light emitting element is condensed through the ball lens,
The light can be incident on the tip of the optical fiber with a connector for guiding the optical signal through the optical fiber with a ferrule for relay.

[0083]

As described above, according to the optical communication module of the present invention, similar to the receptacle type module structure, automatic mounting on a system or the like is easy, and reflow mounting is possible, but the pig High optical coupling sensitivity and high reliability, which are advantages of the tail type module structure, can be realized.

[Brief description of drawings]

FIG. 1 is a partially cut top view schematically showing the structure of an optical receiver module according to a first embodiment of the present invention and a cross-sectional view schematically showing an enlarged structure of a ferrule guide part.

2 is a longitudinal sectional view and a lateral sectional view schematically showing the optical fiber with a ferrule for relay in FIG. 1 taken out and enlarged.

FIG. 3 is a structural explanatory view schematically showing a state in which an optical fiber with a connector is optically coupled to the optical receiving module shown in FIGS. 1 and 2.

FIG. 4 is a cross-sectional view showing an example of an assembly process of the optical receiver module shown in FIGS. 1 and 2.

FIG. 5 is a structural explanatory view schematically showing a state before and after an optical fiber with a connector is optically coupled to the optical receiver module according to the second embodiment of the present invention.

FIG. 6 is a structural explanatory view schematically showing states before and after optically coupling an optical fiber with a connector to an optical receiving module according to a third embodiment of the present invention.

FIG. 7 is a structural explanatory view schematically showing a state before and after an optical fiber with a connector is optically coupled to an optical receiving module according to a fourth embodiment of the present invention.

FIG. 8 is a partially cut top view schematically showing the structure of a conventional receptacle-type optical receiver module, and an enlarged schematic cross-sectional view of the structure of a ferrule guide portion.

9 is a structural explanatory view schematically showing a state in which an optical fiber with a connector is optically coupled to the optical receiver module shown in FIG.

[Explanation of symbols]

A ... Module package part, B ... Ferrule guide part, 1 ... Optical fiber with ferrule for relay, 1a ... Cylindrical metal pipe (metal ferrule), 1b ... Ceramic sleeve, 1c ... Optical fiber (for example, quartz fiber ), 1d, 1e ... End face portion of the optical fiber 1 with a ferrule for relay, 2 ... Cylindrical split sleeve holding portion, 3 ... Split sleeve, 4 ... Cylindrical drop-preventing stopper, 5 ... Cylindrical connector Fixing screw portion, 6 ... Cylindrical holder with a collar, 7 ... Ball lens, 8a ... Light receiving element, 8b ... Carrier, 9 ... Board, 10 ... TIA (transimpedance amplifier), 11 ... Package body, 12 ... Output pin, 13 ... Glass sealing part, 14a ... Optical fiber, 14b ... Ferrule, 14c ... Connector body, 14d ... Ferrule push Spring for-fitting maintain, 14e ... fixing screw portion, 14f ... connector hood, 14 g ... ferrule end face (polished section).

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2H036 QA16 QA44 QA46 QA54 QA59                 2H037 AA01 BA03 BA04 BA12 BA13                       CA10 CA14 DA04 DA06 DA15                       DA32

Claims (4)

[Claims] 1. A receptacle-type module package part having a light-receiving element or a light-emitting element and an optical lens built-in, and an optical communication fiber fixed to the module package part and capable of being optically coupled to the light-receiving element or the light-emitting element. It has a built-in structure in which the optical fiber with a ferrule for relay has is inserted inside from one end side of the split sleeve, and at the time of use, the other end side of the split sleeve is equipped with an optical fiber with a connector for introducing an optical signal or for guiding an optical signal. An optical communication module comprising: a ferrule guide portion into which a ferrule attached at a tip is inserted. 2. The ferrule guide portion is fixed to the holder in a cylindrical holder with a collar, the collar portion of which is fixed to the module package portion, and in a state of being fitted to the outside of the cylindrical portion of the holder. , A cylindrical connector fixing screw portion having a fixing screw groove formed on the outer peripheral surface thereof, a cylindrical split sleeve holding portion fixed inside the holder, and a length inside the split sleeve holding portion. And a split sleeve incorporated in a state capable of moving in a direction, and fixed inside the split sleeve holding portion closer to the module package portion than the split sleeve, and fixed in the length direction of the split sleeve. A cylindrical stopper for preventing the position, and an optical lens of the module package portion that penetrates the inside of the stopper from the vicinity of the middle of the inside of the split sleeve. 2. An optical communication module according to claim 1, further comprising: an optical fiber with a ferrule for relay, which is provided and fixed in a state of facing each other. 3. When the optical communication module is used, a fixing screw portion of an optical fiber with a connector is fitted into the screw portion for fixing a connector, and a ferrule attached to a tip of the optical fiber with a connector is the split sleeve. Is inserted into the other end side of the ferrule, and the ferrule is guided by the split sleeve and is advanced to a position facing the end face portion of the optical fiber with a ferrule for relay at a close range, so that optical coupling is possible. The optical communication module according to claim 1 or 2, which is characterized in that. 4. The optical fiber with a ferrule for relay has a ceramic sleeve through which the optical fiber is passed, and a cylindrical metal pipe surrounding the outside of the sleeve, and these are fixed, The optical communication module according to any one of claims 1 to 3, wherein both end faces in the length direction are subjected to polishing treatment.