JPH08254723A - Optical composite module and its assembly method - Google Patents

Abstract

PURPOSE: To obtain an optical composite module which is low in light loss and is improved in utilization efficiency of exciting light. CONSTITUTION: A square or rectangular casing 5 mounted with optical fibers 6a, 6b respectively on its two side faces facing each other has an exciting light source device 21 and an optical separator 30 for separating the exciting light and signal light. A module for excitation makes the signal light incident from the optical fiber 6a mounted at one side face of the casing 5 and allows the rectilinear transmission of the signal light toward the optical fiber 6b mounted at the other side face through the optical separator 30. The exciting light source device 21 is so arranged that the exciting light emitted from the device is made incident from a direction perpendicular to the progressing direction of the signal light passing the optical separator 30. The incident exciting light on the optical separator 30 is transmitted in the direction opposite to the progressing direction of the signal light. The optical separator and the exciting light source device are arranged within the same casing and the generated exciting light is made incident directly on the optical separator and, therefore, the conversion loss of the exciting light is lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical composite module and an assembling method thereof, and more particularly to an optical composite module provided with a pumping module for an optical fiber amplifier doped with a rare earth element and used for optical communication and an assembling method thereof. It is about.

[0002]

2. Description of the Related Art Conventionally, WDM (wave-length division m)
ultiplexing) optical transmission and optical fiber amplifier (amplifier)
Then, an optical component having a function of combining and splitting light is required. Various optical modules having these functions have been developed or marketed, but in many cases, the multiplexing and branching functions are often realized by a prism or a dielectric multilayer film formed on an optical flat plate. The light transmission characteristics and light reflection characteristics of this dielectric multilayer film have a light incident angle dependency. Therefore,
A prism or optical plate with a high degree of angular accuracy (approximately ±
0.2 to 1.0 °) in the optical module.

On the other hand, as the optical fiber attached to the optical module, a single mode fiber having a core diameter of about 10 μm is often used. Therefore, when optically coupling optical fibers with each other in an optical module or optically coupling an optical fiber with a light emitting element or a light receiving element, coupling through a lens is usually required. Unless the optical fiber, lens, light-emitting element, light-receiving element, etc. are aligned in the micron order or sub-micron order with high precision (optical axis adjustment) and assembled in the optical module, a large optical loss will occur and The performance of the optical module may not be obtained.

Further, in consideration of long-term reliability after assembling the optical module, a fixing technique which requires high reliability is required for assembling these parts which require high positional accuracy. In many cases, a method in which an optical fiber, a lens, a light emitting element, a light receiving element, and the like are attached to a metal component and then the component is fixed to the metal housing by YAG laser welding is used.

FIG. 23 is a block diagram of a conventional bidirectional pumping type optical fiber amplifier. In the figure, an optical branching coupler 10
0, WDM coupler 101, optical isolator 102, ED
F (Erbium doped fiber) 103, excitation LD (laser di
It was common to assemble optical fiber amplifiers by fusion splicing the fiber pigtails of individual optical components such as ode) modules 104 together. It should be noted that the optical branching coupler 100 includes an input monitor 1 using a PD (photo diode).
05 and the output monitor 106 are connected.

In such an optical fiber amplifier, unless the loss of each optical component or the fusion splicing part is carefully managed, the optical loss of the entire optical fiber amplifier becomes large, and a predetermined performance cannot be obtained. There was a point. That is, various attempts have been made to arrange prisms or optical flat plates with a high degree of angular accuracy, but since high processing and assembly techniques are required, mass productivity and cost have become problems.

FIG. 24 is a schematic diagram showing a backward pumping module in a conventional optical fiber amplifier disclosed in, for example, Japanese Patent Application Laid-Open No. 4-12728, and corresponds to the broken line portion shown in FIG. In the figure, the optical fiber 6a connected to the left side of the optical separator 36 in the drawing has an E not shown.
EDF doped with rare earth elements such as r (erbium)
Is provided. Further, the excitation light source 20 in which a semiconductor laser (not shown) is incorporated in the optical separator 36 is connected to the optical separator 36 via an optical fiber 6c. The excitation light source 20 is provided with a terminal 40 for electrical connection with an external device.

In the optical demultiplexer 36, a multiplexer 3 for multiplexing the transmitted signal light and the pumping light from the pumping light source 20,
An optical isolator 4 that passes only light that travels in one direction and blocks light that travels in the opposite direction, and a beam splitter 7 that splits the excitation light and makes it incident on the photodiode 8 are provided. In addition, each of the optical fibers 6a to 6c includes a ferrule 41a to 4c.
The lens holders 44a to 44c for holding the lenses 42a to 42c are respectively connected via 1c.

[0009]

When such a conventional pumping module is used, since the pumping light source 20 and the optical separator 36 are separately configured, the pumping light from the semiconductor laser is once sent to the optical fiber. The light was emitted to 6c, converted into collimated light, and introduced into the light separator 36. Therefore, there is a problem that light loss occurs and it is not easy to supply the excitation light to the EDF while maintaining sufficient intensity. In addition, many attempts have been made to realize such functions of a plurality of optical components by a single optical module, but there is a problem in that they are not necessarily at a satisfactory level in terms of mass productivity and cost. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain an optical composite module having a small light loss and an improved utilization efficiency of excitation light. Another object of the present invention is to obtain an optical composite module in which the angle of the optical member can be set with high accuracy and an assembling method thereof.

[0011]

According to a first aspect of the present invention, there is provided a housing having opposite side surfaces, and an optical demultiplexer arranged in the housing to separate pumping light and signal light. , An optical fiber attached to each of the opposite side surfaces of the housing so that the signal light passes through the optical separation device on substantially the same straight line, and the excitation light is incident on the optical separation device disposed in the housing. And a light source device for excitation. Since the light separation device and the excitation light source device are arranged in the same housing and the emitted excitation light is directly incident on the light separation device, the conversion loss of the excitation light is reduced.

According to a second aspect of the present invention, the pumping light source device is arranged so that the pumping light emitted from the pumping light source is incident in a direction perpendicular to the traveling direction of the signal light passing through the light splitting device. The device is characterized by including a mirror for reflecting the excitation light incident from the excitation light source device and a multiplexer for transmitting the reflected excitation light in a direction opposite to the traveling direction of the signal light. Since the excitation light is incident on the signal light at a right angle, the conversion loss of the excitation light is small, the number of parts is reduced, and the optical axis adjustment becomes easy.

According to a third aspect of the present invention, the pumping light source device is arranged such that the pumping light emitted is parallel to the traveling direction of the signal light passing through the light separating device. Further comprises a mirror that reflects the excitation light emitted from the pump so as to be incident in a direction perpendicular to the light separation device, wherein the light separation device reflects the excitation light that has entered from the excitation light source device, and the reflected excitation light. And a multiplexer for transmitting the light in the direction opposite to the traveling direction of the signal light. Since the excitation light source device and the light separation device are arranged in parallel, the optical composite module itself can be miniaturized.

According to a fourth aspect of the present invention, the excitation light source device is arranged so that the emitted excitation light is inclined with respect to the traveling direction of the signal light passing through the light separation device, and is emitted from the excitation light source device. The pumping light thus input is obliquely incident on the light separating device, and the light separating device further comprises a multiplexer for transmitting the incident pumping light in a direction opposite to the traveling direction of the signal light. By arranging the excitation light source device so as to be inclined with respect to the traveling direction of the signal light, the mirror can be omitted and the number of parts can be reduced. Further, the optical composite module itself can be miniaturized.

According to a fifth aspect of the present invention, the light separating device further includes an optical isolator.

According to a sixth aspect of the present invention, the optical demultiplexing device further includes a beam splitter arranged in the optical path of the signal light, and a photodiode provided in the traveling direction of the signal light.

According to a seventh aspect of the present invention, an enclosure having opposite side surfaces, an optical adder arranged in the enclosure for adding the pumping light and the signal light, and the optical adder on substantially the same straight line. An optical fiber attached to each of the opposite side surfaces of the housing so that the signal light passes therethrough, and a pumping light source device that is disposed in the housing and enters pumping light into the optical adder. Is characterized by. Since the optical adder and the excitation light source device are arranged in the same housing and the emitted excitation light is directly incident on the optical adder, the conversion loss of the excitation light is reduced.

According to an eighth aspect of the present invention, the pumping light source device is arranged so that the pumping light emitted is incident in a direction perpendicular to the traveling direction of the signal light passing through the optical adding device. Is equipped with a mirror for reflecting the excitation light incident from the excitation light source device and a multiplexer for transmitting the reflected excitation light in the same direction as the traveling direction of the signal light. Since the excitation light is incident on the signal light at a right angle, the conversion loss of the excitation light is small, the number of parts is reduced, and the optical axis adjustment becomes easy.

According to a ninth aspect of the present invention, the excitation light source device is arranged such that the emitted excitation light is parallel to the traveling direction of the signal light passing through the optical adder, and the excitation light source device is provided. Further comprises a mirror for reflecting the excitation light emitted from the pump so as to be incident in a direction perpendicular to the optical adder, wherein the optical adder reflects the pump light incident from the excitation light source device, and the reflected pump And a multiplexer for transmitting the light in the same direction as the traveling direction of the signal light. Since the excitation light source device and the light separation device are arranged in parallel, the optical composite module itself can be miniaturized.

According to a tenth aspect of the present invention, the excitation light source device is arranged so that the emitted excitation light is inclined with respect to the traveling direction of the signal light passing through the optical adder, and is emitted from the excitation light source device. The pumping light thus incident is obliquely incident on the optical adder, and the optical adder further comprises a multiplexer for transmitting the incident pumping light in the same direction as the traveling direction of the signal light. By arranging the excitation light source device so as to be inclined with respect to the traveling direction of the signal light, the mirror can be omitted and the number of parts can be reduced. Further, the optical composite module itself can be miniaturized.

The eleventh aspect of the present invention is characterized in that the optical adder further comprises an optical isolator.

According to a twelfth aspect of the present invention, the optical adder further comprises a beam splitter arranged in the optical path of the signal light, and a photodiode provided in the traveling direction of the signal light.

According to a thirteenth aspect of the present invention, the excitation light source device includes a semiconductor laser, a photodiode provided behind the semiconductor laser, and a temperature control device for adjusting the temperature around the semiconductor laser. And

The invention as set forth in claim 14 is characterized in that the excitation light source device further comprises an optical isolator.

According to a fifteenth aspect of the present invention, a concave portion having a carrier portion formed therein and a flat plate portion are provided therein, and the optical base is made by injection molding and is held in a groove formed in the carrier portion. Optical members mounted on the opposite side surfaces of the recess so that the signal light passes substantially on the same straight line, and the excitation light is generated toward the signal light mounted on the flat plate portion. And a light emitting element that operates. Since the optical base formed by injection molding is used, the predetermined shape of the optical base can be easily realized, and the angle of the optical member can be set with high accuracy.

According to a sixteenth aspect of the present invention, a frame is provided which is mounted on the flat plate portion and surrounds the light emitting element, and which is provided with a window member for transmitting the excitation light generated from the light emitting element, and the frame is covered and sealed. And a cover to be opened. There is no need to cover the entire optical base with a cover, which is advantageous in terms of obtaining high airtightness and maintenance.

The invention according to claim 17 is characterized by further comprising a thermistor for detecting the temperature in the vicinity of the light emitting element, and a Peltier element for controlling the temperature of the light emitting element.

According to the eighteenth aspect of the present invention, the optical member is an optical flat plate having a surface on which a dielectric film is formed.

The invention described in Item 19 is characterized in that the optical member is a prism.

According to a twentieth aspect of the present invention, a metal optical base having a recess and a flat plate portion in which a carrier portion having a groove is formed is formed by injection molding, and an optical member is inserted into the groove, A light emitting element that generates excitation light is mounted on the flat plate portion, and then optical fibers are attached to the holes provided on the opposite side surfaces of the recess so that the signal light passes substantially on the same straight line. . Since the optical base formed by injection molding is used, the predetermined shape of the optical base can be easily realized, and the angle of the optical member can be set with high accuracy.

The invention described in claim 21 is characterized in that, when the optical member is inserted into the groove, a leaf spring is inserted together with the optical member. By using the leaf spring together, a high degree of angular accuracy can be obtained more easily.

According to a twenty-second aspect of the present invention, a cylindrical member is attached to the holes provided on the opposite side surfaces of the recess, and the cylindrical member and the lens holder holding the lens are bonded by laser welding. Characterize. Even if the material is difficult to weld, the use of the cylindrical member makes it possible to perform the bonding by laser welding, and the high mounting reliability can be secured.

The invention described in Item 23 is characterized in that the optical base is made of a copper-tungsten alloy. Although it is difficult to weld the copper-tungsten alloy, the use of the cylindrical member according to the twenty-second aspect enables the adhesion by welding.

The invention described in Item 24 is characterized in that the optical base is made of a material containing tungsten as a main component. Since the optical base is made of a material containing tungsten as a main component, laser welding is possible.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts, and the duplicate description will be omitted.

[Embodiment 1] FIG. 1 is a schematic view showing an optical composite module according to Embodiment 1 of the present invention, and FIGS. 1 to 7 show a pumping module of an optical fiber amplifier as an example. This pumping module supplies pumping light to a rare earth element-doped fiber (not shown) such as Er arranged in the rear, and passes the signal light amplified by the rare earth element-doped fiber.

In the figure, a rectangular or rectangular housing 5 having optical fibers 6a and 6b attached to two opposite side surfaces is a pumping light source device 21 and a light separating device 30 for separating pumping light and signal light. It has and. The excitation module makes signal light incident from the optical fiber 6a attached to one side surface of the housing 5, and linearly passes the signal light through the optical demultiplexer 30 toward the optical fiber 6b attached to the other side surface. Let Excitation light source device 2
1 indicates that the excitation light emitted from this device is a light separation device 30.
Are arranged so as to be incident from a direction perpendicular to the traveling direction of the signal light passing therethrough. The excitation light that has entered the light separation device 30 is transmitted in the direction opposite to the traveling direction of the signal light.

Here, the housing 5 is integrally formed by molding a metal or hard plastic member such as SUS (stainless steel), and is provided with a terminal 40 for electrically connecting to an external device. Also, the optical fiber 6
a and 6b are lens holders 44a and 44b for holding the lenses 42a and 42b through the ferrules 41a and 41b.
Lens holders 44a, 44
Windows 43a and 43b are provided on the side surface of the housing 5 adjacent to b.

Further, the excitation light source device 21 is provided with a photodiode 12 and a semiconductor laser 1, and a temperature control device such as a Peltier element is provided around the semiconductor laser 1 in order to prevent fluctuations in output and wavelength due to heat generation. The temperature is controlled by 13. Further, the excitation light source device 21 includes the lens 42c and the optical isolator 11 that allows light to pass through only in the direction of the arrow.

The optical demultiplexer 30 is also provided with an optical isolator 4, a mirror 2 for reflecting light, and a multiplexer 3 for transmitting signal light and reflecting pumping light. These members are arranged in the order of the multiplexer 3 and then the optical isolator 4 along the traveling direction of the signal light (from left to right in the drawing). The excitation light emitted from the excitation light source device 21 is reflected by the mirror 2 and the multiplexer 3, and is emitted in the opposite direction (from right to left in the drawing) to the signal light that has passed through the multiplexer 3. .

With such a configuration, the semiconductor laser 1
The excitation light emitted from the optical fiber 6c is the same as the conventional one.
Since the light is directly incident on the light separation device 30 without passing through, the conversion loss of light is reduced. Further, since the excitation light source device 21 is incorporated in the housing 5, it is easy to handle. Further, in the optical composite module of the present invention, the pumping light source device 21 is arranged so that the pumping light emitted from the pumping device 21 enters from the direction perpendicular to the traveling direction of the signal light passing through the light separating device 30. Therefore, the assembly of the optical composite module becomes easy.

By reversing the direction of the optical isolator 4, the optical demultiplexer 30 can function as an optical adder.

[Embodiment 2] FIG. 2 is a schematic view showing an optical composite module according to Embodiment 2 of the present invention. The basic structure is the same as that of FIG.
The difference is that the pumping light source device 21 is arranged in the housing 5 so that the pumping light emitted from the laser light 1 is parallel to the traveling direction of the signal light (the opposite direction in the drawing). Excitation light source device 2
The excitation light emitted from the laser beam No. 1 is reflected by the mirror 2a and enters the light separation device 30 from a direction perpendicular to the traveling direction of the signal light. With such a configuration, the optical composite module can be downsized.

[Embodiment 3] FIG. 3 is a schematic view showing an optical composite module according to Embodiment 3 of the present invention. This optical composite module is provided with a rare earth element-doped fiber (not shown) such as Er arranged in front. ) Is supplied with excitation light. The configuration in which the rare earth element-doped fiber is arranged in front of this is shown in FIGS. 4, 5, and 6 described below.
The same is true for.

In the figure, a rectangular or rectangular housing 5 having optical fibers 6a and 6b attached to two opposite side surfaces is a pumping light source device 21 and an optical adder for multiplexing pumping light and signal light. 31 and 31 are provided. The optical composite module makes signal light incident from the optical fiber 6b attached to one side surface of the housing 5, and linearly passes the signal light toward the optical fiber 6a attached to the other side surface through the optical adder 31. Let Excitation light source device 2
1 is arranged so that the excitation light emitted from this device is parallel to the traveling direction of the signal light. The excitation light emitted from the excitation light source device 21 is reflected by the mirror 2a and is incident on the optical adder 31 from a direction perpendicular to the traveling direction of the signal light, and the incident excitation light is reflected by the mirror 2b. The wave 3 is transmitted in the same direction as the traveling direction of the signal light. Here, the optical adder 31 includes at least the optical isolator 4, the multiplexer 3, and the mirror 2, and the optical isolator 4 and then the multiplexer 3 along the traveling direction of the signal light (from right to left in the drawing). Are arranged in order.

With such a configuration, the semiconductor laser 1
The excitation light emitted from the optical fiber 6c is the same as the conventional one.
Since the light is directly incident on the optical adder 31 without passing through, the conversion loss of light is reduced. Further, since the excitation light source device 21 is incorporated in the housing 5, it is easy to handle. Furthermore, the optical composite module of the present invention is easy to assemble and can be miniaturized.

[Embodiment 4] FIG. 4 is a schematic diagram showing an optical composite module according to Embodiment 4 of the present invention. This optical composite module is a pumping light for a rare earth element-doped fiber such as Er arranged in front. Is supplied, and the signal light amplified by the rare earth element-doped fiber is passed through.

In the figure, a rectangular or rectangular housing 5 having optical fibers 6a and 6b attached to two opposite side surfaces is a pumping light source device 22 and an optical adder for multiplexing pumping light and signal light. And 32. The optical composite module makes signal light incident from the optical fiber 6b attached to one side surface of the housing 5, and straightens the signal light toward the optical fiber 6a attached to the other side surface of the housing 5 through the optical adder 32. Pass it in a shape. The excitation light source device 22 is arranged such that the excitation light emitted from this device is parallel to the traveling direction of the signal light. Also,
The excitation light emitted from the excitation light source device 22 is reflected by the mirror 2
The excitation light reflected by a is incident on the optical adder 32 from a direction perpendicular to the traveling direction of the signal light, and the incident excitation light is reflected by the mirror 2
It is reflected by b and is transmitted by the multiplexer 3 in the same direction as the traveling direction of the signal light.

The excitation light source device 22 is provided with the semiconductor laser 1 and the photodiode 12 behind it, and the temperature of the periphery of the semiconductor laser 1 is controlled by the temperature control device 13. The optical adder 32 includes at least the optical isolator 4, the mirror 2b, and the multiplexer 3. Note that the multiplexer 3 and the optical isolator 4 are arranged in this order along the traveling direction of the signal light (from right to left in the drawing). With such a configuration, even if the amplified signal light may be reflected, it is sufficiently attenuated by the optical isolator 4, so that the optical isolator 11 provided in the pumping light source device 22 can be omitted. . Therefore, the structure of the optical composite module can be simplified and the cost can be reduced.

[Embodiment 5] FIG. 5 is a schematic view showing an optical composite module according to Embodiment 5 of the present invention. In the figure, an optical fiber 6 is provided on each of two opposite side surfaces.
The rectangular or rectangular housing 5 to which a and 6b are attached is
The pumping light source device 22 and the optical adder device 33 that multiplexes the pumping light and the signal light are provided. The optical composite module makes the signal light incident from the optical fiber 6b attached to one side surface of the housing 5, and linearly passes the signal light toward the optical fiber 6a attached to the other side surface through the optical adder 33. Let The excitation light source device 22 is arranged such that the excitation light emitted from this device is parallel to the traveling direction of the signal light.

The excitation light emitted from the excitation light source device 22 is reflected by the mirror 2a and is incident on the optical adder 33 from a direction perpendicular to the traveling direction of the signal light, and the incident excitation light is reflected by the mirror 2b. The reflected light is combined with the signal light by the multiplexer 3 and transmitted in the same direction as the traveling direction of the signal light. The optical isolator 4 is provided on the optical axis between the side surface of the housing 5 and the lens holder 44a. Here, the excitation light source device 22 includes the semiconductor laser 1 and the photodiode 12 behind the semiconductor laser 1, and the temperature of the periphery of the semiconductor laser 1 is controlled by the temperature control device 13. The optical adder 33 includes at least the mirror 2b and the multiplexer 3, and the multiplexer 3 is arranged on the optical path of the signal light.

With such a configuration, the optical isolator 4 can be omitted in the pumping light source device 22 and the optical adder device 33. Therefore, the structure of the optical composite module can be simplified and the cost can be reduced.

[Sixth Embodiment] FIG. 6 is a schematic view showing an optical composite module according to a sixth embodiment of the present invention. In the optical composite module shown in FIGS. 6 and 7, the number of components is reduced by arranging the pumping light source device at an angle with respect to the traveling direction of the signal light.

In the figure, a rectangular or rectangular housing 5 having optical fibers 6a and 6b attached to two opposite side surfaces is a pumping light source device 22 and an optical adder for multiplexing pumping light and signal light. And 34. The optical composite module makes signal light incident from the optical fiber 6a attached to one side surface of the housing 5, and linearly passes the signal light toward the optical fiber 6b attached to the other side surface through the optical adder 34. Let Excitation light source device 2
2 is arranged so that the excitation light emitted from this device is inclined with respect to the traveling direction of the signal light. That is, the pumping light emitted from the pumping light source device 22 is incident on the optical adder 34 with an inclination with respect to the traveling direction of the signal light, and the incident pumping light is reflected by the multiplexer 3 and the signal light. And are transmitted in the same direction as the traveling direction of the signal light. The optical isolator 4 is provided on the optical axis between the side surface of the housing 5 and the lens holder 44a.

The excitation light source device 22 is provided with the semiconductor laser 1 and the photodiode 12 behind it, and the temperature of the periphery of the semiconductor laser 1 is controlled by the temperature control device 13. The optical adder 34 includes at least the multiplexer 3, and the multiplexer 3 is arranged on the optical path of the signal light and inclined with respect to the signal light. The pumping light emitted from the pumping light source device 22 is reflected by the multiplexer 3 and is multiplexed with the signal light passing through the multiplexer 3 by the multiplexer 3 and then in the same direction as the signal light (in the drawing). The optical isolator 4 is passed from right to left). With this configuration, the mirror has the same function as that of the fifth embodiment, but the mirror can be omitted. Therefore, the optical composite module can be made compact.

[Embodiment 7] FIG. 7 is a schematic diagram showing an optical composite module according to Embodiment 7 of the present invention. The optical composite module is a pumping light for a rare earth element-doped fiber such as Er arranged in the rear. Is supplied, and the signal light amplified by the rare earth element-doped fiber is passed through.

In the figure, a rectangular or rectangular housing 5 having optical fibers 6a and 6b attached to two opposite side surfaces is a pumping light source device 21 and a light separating device for separating pumping light and signal light. And 35. The optical composite module makes the signal light incident from the optical fiber 6a attached to one side surface of the housing 5, and linearly passes the signal light toward the optical fiber 6b attached to the other side surface through the optical separation device 35. Let Excitation light source device 2
1 is arranged so that the excitation light emitted from this device is inclined with respect to the traveling direction of the signal light. Further, the excitation light emitted from the excitation light source device 21 is incident on the light separation device 35 with an inclination with respect to the traveling direction of the signal light, and the incident excitation light is reflected by the multiplexer 3 to generate the signal light. Is emitted so as to be transmitted in the direction opposite to the traveling direction of.

The excitation light source device 21 is provided with the semiconductor laser 1 and the photodiode 12 behind it, and the temperature of the periphery of the semiconductor laser 1 is controlled by the temperature control device 13. Further, the optical demultiplexer 35 includes at least the optical isolator 4 and the multiplexer 3, and the multiplexer 3 and the optical isolator 4 in the traveling direction of the signal light.
And the multiplexer 3 is arranged to be inclined with respect to the signal light.

The excitation light emitted from the excitation light source device 21 is reflected by the multiplexer 3 and emitted in the direction opposite to the signal light that has passed through the multiplexer 3 (from right to left in the drawing). With such a configuration, the mirror has the same function as in the first or second embodiment, but the mirror can be omitted. Therefore,
The optical composite module can be made compact.

In the above-described embodiment, in the optical demultiplexer 30, the optical demultiplexer 35, and the optical adders 31 to 34, the beam splitter 7 in the optical path of the signal light and the photo beam in the direction orthogonal to the signal light. The diode 8 may be provided. The signal level can be monitored by the photodiode 8, and the optical composite module can be operated smoothly.

[Embodiment 8] FIGS. 8 and 9 are a perspective view and a schematic plan view, respectively, showing an optical composite module according to Embodiment 8 of the present invention. In these figures,
In FIG. 8, the illustration of the cover on the optical base is omitted,
In FIG. 9, the illustration of the cover on the frame and the cover on the optical base is omitted. The optical composite module in these figures corresponds to the hybrid integrated function of the broken line portion in FIG.

In these figures, the optical base 45 is provided with a concave portion 46 in which a carrier portion for accommodating an optical flat plate, an optical isolator 59, etc. is formed.
A frame 48 that accommodates the chips 52 and the like is placed. A cover 48a is provided on the frame 48, and a terminal 40 for electrical connection with an external circuit is provided on the side surface.
Is protruding. The lens 6 is provided on the side surface of the recess 46.
Lens holders 47a, 47 accommodating 1, 58 respectively
To b, the optical fiber core wires 50 and 51 are connected via ferrules 49a and 49b, respectively.

Excitation light (for example, wavelength 1.48 μm) emitted from the excitation LD chip 52 is converted by the lens 53 from divergent light into parallel light or focused light. After that, the excitation light passes through the window material 54, and SWPF (short wave-length pa).
ss filter) 55, is further reflected by two WDM filters 56 and 57, passes through a lens 58, and is incident on an optical fiber (core wire) 51.

On the other hand, from the EDF (not shown) to the optical fiber 5
Amplified signal light incident on 1 (for example, wavelength 1.55μ
Most of m) passes through the WDM filter 57, the optical isolator 59, and the beam splitter 60, and enters the optical fiber core wire 50. Further, a part (1 to 10%) of the signal light is reflected by the beam splitter 60, further reflected by the total reflection mirror 62, and then enters the photodiode serving as the monitor PD 97. In this embodiment, the monitor PD 97 functions as an output monitor of the optical fiber amplifier.

Here, the optical fiber core wire is an optical fiber composed of a core and a clad, which is provided with a primary coating and a secondary coating, but the number of layers of the coating is not particularly limited in the present invention. Absent. The WDM filter has a characteristic of transmitting signal light and reflecting excitation light. SWPF
Has a function of reflecting signal light and transmitting excitation light, contrary to the WDM filter. The WDM filter transmits most of the signal light, but slightly (for example, −20d).
B) There are also components that reflect. This reflection component is the excitation LD
After reaching the chip, it reaches the optical fiber core and finally the EDF while being reflected by the end face and being attenuated by the WDM filter. Thus, even slight reflection of the signal component may deteriorate the characteristics of the optical fiber amplifier. For the purpose of suppressing such deterioration, a SWPF is inserted to reflect and attenuate the signal light leakage component in the pumping light path. However, W
The SWPF may be omitted depending on the signal light reflection characteristics of the DM filter and the required characteristics of the optical fiber amplifier used.

Optical flat plates such as WDM filters, SWPFs, beam splitters, and total reflection mirrors are formed by forming a dielectric multilayer film on a glass material such as a transparent substrate such as "BK7" (borosilicate crown glass). . These are designed so as to have predetermined reflectance and transmittance with respect to light having a predetermined wavelength, but the design performance cannot be obtained unless they are used at a predetermined light incident angle. Therefore, it is very important in the optical composite module to hold these optical flat plates while maintaining a predetermined angle.

[Embodiment 9] FIG. 10 is an exploded perspective view showing the optical base, frame and the like shown in FIG.
1 is an enlarged perspective view showing an optical base. In these figures, the optical base 45 is formed by injection molding of a metal material. In the recess 46 of the optical base 45, the grooves 63 to 67 for receiving the optical flat plate and the groove 6 for transmitting light are provided.
8, a groove 69 for receiving the optical isolator 59, holes 70 to 73 for transmitting light, and the like are provided.
As described above, although the optical base 45 has a complicated structure, it can be manufactured with high accuracy and good reproducibility by adopting injection molding. The marker 74 is provided as a reference for positioning when mounting a Peltier element 75, which will be described later.

The various members shown in FIG. 10 are attached in the following manner. First, although it depends on the required level of the sealing performance of the excitation LD chip 52, in the present embodiment, it is 10 ^−8.
In order to obtain airtightness of about cc / sec, the optical base 45 and the frame 48, the frame 48 and the seal ring 76, the window member 54 and the frame 48, the spacer 78 for mounting the wiring board 77 and the optical base 45, and the wiring board 77 and spacer 7
All of 8 are brazed or soldered. Further, the terminals (lead pins) 40 and the frame 48 were attached with a low melting point glass in order to ensure electrical insulation. When the required level of sealing performance is low, an organic resin may be used for the above joining.

As the seal ring 76, it is assumed that a cover 48a, which will be described later, is attached by seam welding to hermetically seal, and a material having good weldability, for example, kovar is used. However, the seal ring is not necessary when the frame 48 itself is made of a material having good weldability or when the cover is attached by a method other than welding, and the cover 4
8a may be directly attached to the frame 48. Alternatively, the lead pin 40 and the window member 54 may be attached after the frame 48 is formed integrally with the optical base 45 by injection molding. However, unless the inner dimension of the frame 48 is sufficiently large, it is difficult to form the hole 54a that is the window member 54 mounting portion by molding. Therefore, in the present embodiment, the frame 48 and the optical base 45 are different components. did.

The spacer 78 is used for the purpose of adjusting the height of the wiring board 77 in order to facilitate electrical connection between the wiring board 79 and the lead pins 40, which will be described later, and the wiring board 77. However, the spacer 78 may be integrally molded with the optical base 45. Further, a rib 81 is provided on the flat plate portion 80 of the optical base 45. The rib 81 can be used for positioning when the frame 48 is mounted on the optical base 45, and also has an effect of suppressing warpage of the thin flat plate portion 80 having a relatively large area.

Next, after assembling the frame 48, the wiring board 77 and the like as shown in FIG. 10, the Peltier element 75 and the spacer 82 are mounted on the flat plate portion 80 of the optical base 45 as shown in FIG. For these joints, soldering was adopted with particular emphasis on heat dissipation. Where the spacer 8
2 is inserted because the area difference between the saddle 83 and the Peltier element 75 described later is large. Therefore, the spacer 82 may be omitted when the areas of these two are relatively close. The lead wire 84 after soldering the Peltier element 75 described above is attached to a predetermined pad (not shown) of the wiring board 77 by soldering.

Then, as shown in FIG.
5 is attached to the optical base 45, and a spacer 82
The saddle 83 is fixed on the top with solder. As described above, the optical flat plate 85 has a predetermined performance with respect to light having a predetermined incident angle, and the narrower the allowable range of the angle is, the more the optical flat plate 8 becomes.
The yield improvement and the cost reduction of No. 5 can be expected. In the present invention, since the grooves 63 to 67 on the optical base 45 can be formed with high accuracy, the angle of the optical flat plate 85 can be set with reference to the grooves 63 to 67. Here, a method of obtaining a predetermined angle accuracy by sufficiently reducing the clearance between the grooves 63 to 67 and the optical flat plate 85 can be considered, but there is a problem that the control of the thickness of the optical flat plate 85 becomes strict.

When the required angular accuracy is severe, it is desirable to insert the optical flat plate 85 into the grooves 63 to 67 together with the leaf spring 86 as shown in FIG. With such a configuration, even if the control of the thickness of the optical flat plate 85 is eased, the optical flat plate 85 can be attached with the angular accuracy determined by the formation accuracy of the grooves 63 to 67. The leaf spring 86 may be left in the final product as a fixing means of the optical flat plate 85. Alternatively, the optical flat plate 85 may be fixed to the grooves 63 to 67 with an adhesive or the like, and the plate spring 86 may be a temporary fixing means until the fixing is completed. Of course, the fixing by the leaf spring 86 and the fixing by the adhesive may be used together.

15 to 18 are perspective views showing the saddle 83 and the components assembled therein. In these figures, the wiring board 79 is first attached to the saddle 83 by soldering or brazing. Next, excitation LD
A chip carrier 88 on which a PD chip 87 for monitoring that monitors light is mounted is attached to a wiring board 79, and excitation L
The chip carrier 90 on which the D chip 52 and the thermistor 89 are mounted is attached to the saddle 83.

Next, as shown in FIG. 17, the light from the excitation LD chip 52 is turned into a beam having a predetermined focal length (infinity, that is, a parallel beam is possible) directed in a predetermined direction. The lens 53 held by the lens barrel 91 is attached to the saddle 83 by the extension barrel 92 and the sleeve 93 after adjusting the positional relationship with the excitation LD chip 52 or the distance. In order to enable such adjustment of the positional relationship, a lens barrel 91 made of metal, to which the lens 53 is attached, and a sleeve 93 made of metal having an inner diameter slightly larger than the outer diameter of the lens barrel 91. Was prepared so that the lens barrel 91 could slide with respect to the sleeve 93. Further, the extension lens barrel 92 is fixed to the lens barrel 91 in advance and used for the purpose of facilitating handling when adjusting the position of the lens barrel 91. After adjusting the position and distance of the lens 53 with such a configuration, the lens barrel 91, the sleeve 93, and (the front surface of) the saddle 83 were fixed by laser welding.

Saddle 83 thus assembled
When attaching the spacer to the spacer 82, the excitation LD chip 5
The saddle 83 is attached with its direction and position adjusted so that the excitation light from 2 is emitted at a predetermined angle (approximately perpendicular to the side surface of the optical base 45) near the center of the hole 70. That is, the saddle 83 is pressed by a jig (not shown), the jig is moved to the position where the excitation light is emitted in a predetermined direction in the order of micron, and the saddle 83 is fixed with the low melting point solder.

After the optical flat plate 85 and the saddle 83 have been attached to the optical base 45 as described above, the wiring boards 77 and 79 and the lead pins are electrically connected by the wires 94 by wire bonding. Further, as shown in FIG. 19, the cover 48a was attached to the frame 48 via the seal ring 76 by seam welding in a dry nitrogen atmosphere to hermetically seal the excitation LD chip 52 and the like.

Next, as shown in FIG. 20, lenses 58,
61 and the optical fiber core wires 50 and 51 were attached to the optical base 45. The lens barrel 47b to which the lenses 58 and 61 are attached is housed in the lens holder 47b.
The lenses 58 and 61 and the optical fiber core wires 50 and 51 were aligned, and the hole bonding surface 70a, the lens holder 47b, and the sleeve 93 were bonded by laser welding.

Subsequently, the optical isolator 59 is attached to the isolator base 96, and the isolator base 96 is attached.
Is mounted in the groove 69 formed in the recess 46 of the optical base 45. In order to reduce the cost of the optical isolator 59, it is desirable to make the light transmission region as small as possible, that is, to reduce the dimensions of the birefringent crystal and the Faraday rotator that form the optical isolator. On the other hand, there is a certain level of variation in the position of the beam of the signal light from the optical fiber core wire 51 due to the assembly accuracy of the module. Even in the presence of such variations, the isolator base 96 is vertically and horizontally slidable in the groove 69 in order to use an inexpensive optical isolator (that is, a small light transmission area) as much as possible. And Of course, when an optical isolator having a sufficiently large light transmission region is used, a groove for directly receiving the optical isolator, for example, a square groove, a V-shaped groove, a U-shaped groove or the like is formed on the optical base. You may stay. Next, after the optical isolator 59 was attached to the groove 69, the optical fiber core wire 50 and the lens 61 were aligned so as to be sufficiently coupled to the signal light, and then fixed to the optical base 45.

Next, the monitor PD 97 mounted in a cylindrical metal package is attached to the hole 72 of the optical base 45 so that a part of the signal light reflected by the beam splitter 60 and the total reflection mirror 62 can be received. I chose Finally, in order to prevent dust on the optical plate 85 and the optical path of the excitation light, a cover covering the entire optical composite module is attached to complete the optical composite module.

The embodiment described above is an optical compound module for the latter stage of the bidirectional pumping type optical fiber amplifier, but the optical compound module for the former stage can also be realized by a common member. That is, by reversing the direction of the optical isolator 59 and attaching the monitor PD 97 to the hole 71 as shown in FIG. 21, the optical composite module for the preceding stage can be assembled. Further, in the optical composite module for the subsequent stage, a reflection monitor PD for detecting the reflected light generated when the connector on the light output side is disconnected may be required. In this case, the monitor PD 9 is also provided in the hole 71 of the latter-stage optical composite module.
Just attach 7.

A prism may be used instead of the optical flat plate 85 which is an optical member. For example, two WDM
It is also possible to form the filters 56 and 57 and one SWPF 55 on the three surfaces of one prism. In this case, a groove corresponding to the shape of the prism may be formed on the optical base. Also in that case, the use of the leaf spring is effective. Furthermore, it goes without saying that the present invention can also realize an optical composite module that does not include a light emitting element. For example, in the optical composite module for the latter stage of the forward pumping type optical fiber amplifier, the optical composite module in the eighth embodiment is replaced with the flat plate portion 8.
This can be realized by removing 0, the excitation LD chip 52 and the like mounted therein, the WDM filters 56 and 57, and the SWPF 55. Further, the pumping LD may be prepared as a separate module and the pumping light may be supplied to the optical composite module by an optical fiber. In that case, the flat plate portion 80 of the optical base 45 is removed (FIGS. 10 and 11), and the hole 7
The optical fiber for supplying the excitation light and the lens may be arranged at the position of 3.

In the above-described Embodiments 8 and 9, the selection of the material for the optical base is important. That is, the material of the optical base should be selected from the following viewpoints.

(1) Low expansion coefficient. When mounting a light emitting element, a Peltier element, or the like, a material having a relatively small linear expansion coefficient such as ceramics is often mounted. In this case, in order to prevent deformation and peeling at the time of joining, it is desirable to use a material having a linear expansion coefficient close to those. In addition, even if you do not mount a light emitting element or Peltier element,
It is effective to use a material having a small linear expansion coefficient in order to prevent problems such as optical axis shift due to thermal strain.

(2) High thermal conductivity. This is important when mounting a light emitting element, a Peltier element, or the like. In particular, when a 1.48 μm excitation LD is used, the excitation LD chip alone generates heat of 1 to 1.5 W, and at higher temperatures, the heat generated by the Peltier element is 1.5 to 2.
5W is added. Therefore, in order to sufficiently radiate these heats, a material having high thermal conductivity is desirable.

(3) High rigidity. A material having high rigidity (high Young's modulus) is desirable in order to prevent the optical axis from being displaced and causing an optical loss due to deformation by an external force. In particular, high rigidity is desirable when providing a relatively large area flat plate portion for mounting a light emitting element or the like.

(4) Welding is possible. Laser welding, which has high assembly reliability, is generally used for fixing lenses and optical fibers. Therefore, the optical base is preferably made of a material that can be laser-welded.

The material selection changes depending on which of the above four items is emphasized.

Table 1 below shows an example of a material suitable as an optical base.

[0090]

[Table 1] For the optical composite module not including the light emitting element, the item (4)
Kovar and stainless steel are preferred with emphasis on. on the other hand,
If a light emitting element or Peltier element is included, items (1) to
Emphasizing (3), tungsten or a copper tungsten alloy (for example, Cu20W80) is desirable and can be preferably used. In the case of a material containing tungsten as its main component (only shown as tungsten in Table 1), it may be a high melting point material, and laser welding is possible, but relatively high laser energy is required. When fixing a lens or an optical fiber, a positional deviation on the order of micron affects optical loss, so it is desirable to suppress the energy of the laser as much as possible. The material containing tungsten as a main component is preferably a material containing 90% or more of tungsten. Since Ni (nickel) is usually used as a catalyst when injection-molding a material containing tungsten as a main component, the molded product may contain several% of Ni. However, a few% of Ni
Even if it contains, the physical properties shown in Table 1 are slightly inferior, but various properties such as low expansion coefficient, high thermal conductivity and high rigidity are still maintained.

In the case of copper tungsten, welding is difficult. In such a case, as shown in FIG. 22, a cylindrical member 99 made of a material having good weldability such as stainless steel or Kovar is attached to the hole 70 of the optical base 45, and the lens holder 47b or the like is attached thereto. Weld it. By using the cylindrical member 99, a copper tungsten alloy can also be preferably used. The cylindrical member 99 may be attached by laser welding with high energy, or by brazing, press fitting, or the like, since strict positional accuracy is not required. Further, a similar cylindrical member may be attached to the holes 71 and 72 for attaching the PD.

[0092]

As described above, according to the present invention, since the light separating device and the pumping light source device are provided in the same housing, the emitted pumping light is directly transmitted through the light separating device to the optical fiber amplifier. Since it is possible to improve the utilization efficiency of the excitation light, and because the device can be made compact, its handling becomes easy. Furthermore, since the number of optical isolators 59 can be reduced, the device can be manufactured at low cost.

By using an optical base formed by metal injection molding, the angle of the optical member can be set with high accuracy. As a result, the dielectric film formed on the surface of the optical member only needs to ensure the predetermined characteristics within a limited light incident angle range, and as a result, the yield of the optical member can be improved and the cost can be reduced. Produce an effect. Further, by forming the optical base with a material having appropriate heat conduction and rigidity, the flat plate portion serves to radiate heat generated from the light emitting element. Further, since the flat plate portion is a part of the optical base, the effect that the entire optical base functions as a radiator having a relatively large capacity can be expected. Furthermore, by mounting the light emitting element and the optical fiber or the optical member on the highly rigid optical base, it is possible to avoid a situation in which an excessive optical coupling loss occurs due to deformation due to an external force.

[Brief description of drawings]

FIG. 1 is a schematic view showing an optical composite module according to Embodiment 1 of the present invention.

FIG. 2 is a schematic view showing an optical composite module according to Embodiment 2 of the present invention.

FIG. 3 is a schematic view showing an optical composite module according to Embodiment 3 of the present invention.

FIG. 4 is a schematic view showing an optical composite module according to Embodiment 4 of the present invention.

FIG. 5 is a schematic view showing an optical composite module according to Embodiment 5 of the present invention.

FIG. 6 is a schematic view showing an optical composite module according to Embodiment 6 of the present invention.

FIG. 7 is a schematic view showing an optical composite module according to Embodiment 7 of the present invention.

FIG. 8 is a perspective view showing an optical composite module according to Embodiment 8 of the present invention.

FIG. 9 is a schematic plan view showing an optical composite module according to Embodiment 8 of the present invention.

FIG. 10 is an exploded perspective view showing an optical base, a frame and the like of an optical composite module according to Embodiment 9 of the present invention.

11 is an enlarged perspective view showing the optical base shown in FIG.

FIG. 12 is a perspective view showing a state in which a frame and the like are mounted on the optical base.

FIG. 13 is a perspective view showing a state where an optical flat plate is inserted into the optical base.

FIG. 14 is a perspective view showing a state in which a leaf spring is inserted in a groove of an optical base.

FIG. 15 is a perspective view showing a state in which a wiring board is bonded to a saddle.

FIG. 16 is a perspective view showing a state in which a chip carrier and the like are mounted on the saddle.

FIG. 17 is a perspective view showing a state in which a lens barrel and the like are attached to a saddle.

FIG. 18 is a perspective view showing the assembled saddle.

FIG. 19 is a perspective view showing a state in which the cover is attached to the frame.

FIG. 20 is an exploded perspective view showing a state in which an optical fiber is attached to the optical base.

FIG. 21 is a perspective view showing a state in which the monitor PD is attached to the hole of the optical base.

FIG. 22 is a perspective view showing a state where the cylindrical member is attached to the hole of the optical base.

FIG. 23 is a configuration diagram showing a conventional optical composite module.

FIG. 24 is a schematic view showing a backward pumping module in a conventional optical fiber amplifier.

[Explanation of Codes] 1 ... Semiconductor laser, 2 ... Mirror, 3 ... Combiner, 4, 1
1, 59 ... Optical isolator, 5 ... Housing, 6a-6c ... Optical fiber, 7, 60 ... Beam splitter, 8, 12 ... Photodiode, 13 ... Temperature control device, 20 ... Excitation light source, 21, 22 ... Excitation Light source device, 30, 35 ... Optical separating device, 31, 32, 33, 34 ... Optical adding device, 36 ... Optical separating device, 40 ... Terminal, 41, 49a, 49b ... Ferrule, 42 ... Lens, 43 ... Window, 44 , 47a, 47b ...
Lens holder, 45 ... Optical base, 46 ... Recessed portion, 48 ...
Frame, 48a ... Cover, 50, 51 ... Optical fiber core wire, 52 ... Excitation LD chip, 53, 58, 61 ... Lens, 54 ... Window material, 54a ... Hole, 55 ... SWPF, 56,
57 ... WDM filter, 62 ... Total reflection mirror, 63-6
9 ... Groove, 70-73 ... Hole, 70a ... Hole bonding surface, 74 ... Marker, 75 ... Peltier element, 76 ... Seal ring, 7
7, 79 ... Wiring board, 78, 82 ... Spacer, 81 ... Rib, 83 ... Saddle, 84 ... Lead wire, 85 ... Optical flat plate,
86 ... Leaf spring, 87 ... PD chip, 88, 90 ... Chip carrier, 91, 95 ... Lens barrel, 92 ... Extension barrel,
93 ... Sleeve, 94 ... Wire, 96 ... Isolator base, 97 ... Monitor PD, 98 ... PD holder, 99 ... Cylindrical member, 100 ... Optical branching coupler, 101 ... WDM coupler, 102 ... Optical isolator, 103 ... EDF, 104
... Excitation LD module, 105 ... Input monitor, 106 ...
Output monitor.

Claims (24)

[Claims] 1. A housing having opposite side surfaces, an optical demultiplexer arranged in the housing to separate excitation light and signal light, and signal light passing through the optical demultiplexer on substantially the same straight line. As described above, an optical composite comprising: an optical fiber attached to each of the opposite side surfaces of the housing; and an excitation light source device that is disposed in the housing and makes excitation light incident on the light separation device. module. 2. The pumping light source device is arranged such that the pumping light emitted from the pumping light source is incident in a direction perpendicular to the traveling direction of the signal light passing through the light splitting device, and the light splitting device is the pumping light source. The optical composite module according to claim 1, further comprising: a mirror for reflecting the excitation light incident from the device, and a multiplexer for transmitting the reflected excitation light in a direction opposite to the traveling direction of the signal light. 3. The excitation light source device is arranged such that the emitted excitation light is parallel to the traveling direction of the signal light passing through the light separation device, and the excitation light emitted from the excitation light source device is The light separation device further includes a mirror that reflects the light so as to be incident in a direction perpendicular to the light separation device, and the light separation device reflects the excitation light that is incident from the excitation light source device, and the reflected excitation light is a signal light that travels. The optical composite module according to claim 1, further comprising: a multiplexer for transmitting in a direction opposite to the direction. 4. The excitation light source device is arranged such that the emitted excitation light is inclined with respect to the traveling direction of the signal light passing through the light separation device, and the excitation light emitted from the excitation light source device is the above-mentioned. 2. The optical separator, which is obliquely incident, is further provided with a multiplexer for transmitting the incident excitation light in a direction opposite to a traveling direction of the signal light.
The optical composite module described. 5. The optical composite module according to claim 1, wherein the optical separation device further comprises an optical isolator. 6. The light splitting device according to claim 1, further comprising a beam splitter arranged in an optical path of the signal light, and a photodiode provided in a traveling direction of the signal light. Composite module. 7. A housing having opposite side surfaces, an optical adder arranged in the housing for adding pumping light and signal light, and signal light passing through the optical adder on substantially the same straight line. As described above, an optical composite comprising: an optical fiber attached to each of the opposite side surfaces of the housing; and an excitation light source device that is disposed in the housing and injects excitation light into the optical adder. module. 8. The pumping light source device is arranged so that the pumping light emitted from the pumping light source is incident in a direction perpendicular to the traveling direction of the signal light passing through the optical adding device, and the optical adding device is the pumping light source device. 8. The optical composite module according to claim 7, further comprising: a mirror that reflects the excitation light that is incident from and a multiplexer that transmits the reflected excitation light in the same direction as the traveling direction of the signal light. 9. The excitation light source device is arranged such that the emitted excitation light is parallel to the traveling direction of the signal light passing through the optical adder, and the excitation light emitted from the excitation light source device is The optical adder further includes a mirror that reflects the incident light in a direction perpendicular to the optical adder, the optical adder reflecting the pumping light incident from the pumping light source device, and the reflected pumping light as signal light traveling. The optical composite module according to claim 7, further comprising: a multiplexer for transmitting in the same direction. 10. The excitation light source device is arranged such that the emitted excitation light is inclined with respect to the traveling direction of the signal light passing through the optical adder, and the excitation light emitted from the excitation light source device is the above-mentioned. 8. The optical adder is obliquely incident on the optical adder, and the optical adder further comprises a multiplexer for transmitting the incident pumping light in the same direction as the traveling direction of the signal light.
The optical composite module described. 11. The optical composite module according to claim 7, wherein the optical adder further comprises an optical isolator. 12. The optical adder according to claim 7, further comprising a beam splitter arranged in the optical path of the signal light, and a photodiode provided in the traveling direction of the signal light. Composite module. 13. The excitation light source device comprises a semiconductor laser,
8. The optical composite module according to claim 1, further comprising a photodiode provided at a rear side of the semiconductor laser and a temperature control device for adjusting a temperature around the semiconductor laser. 14. The optical composite module according to claim 1, wherein the excitation light source device further includes an optical isolator. 15. An optical base made of metal, which has a concave portion and a flat plate portion in which a carrier portion is formed, and is molded by injection molding; and an optical member held in a groove formed in the carrier portion. An optical fiber attached to each of the opposite side surfaces of the recess so that the signal light passes substantially on the same straight line; and a light-emitting element mounted on the flat plate portion and emitting excitation light toward the signal light. An optical composite module characterized by being provided. 16. A light emitting device is mounted on a flat plate portion to surround the light emitting device,
The frame further includes a frame provided with a window member that transmits excitation light generated from the light emitting element, and a cover that covers the frame and is sealed.
The optical composite module described. 17. The optical composite module according to claim 15, further comprising a thermistor for detecting the temperature in the vicinity of the light emitting element, and a Peltier element for controlling the temperature of the light emitting element. 18. The optical composite module according to claim 15, wherein the optical member is an optical flat plate having a dielectric film formed on the surface thereof. 19. The optical composite module according to claim 15, wherein the optical member is a prism. 20. An optical base made of metal having a concave portion having a grooved carrier portion formed therein and a flat plate portion is molded by injection molding, an optical member is inserted into the groove, and excitation light is applied to the flat plate portion. A method for assembling an optical composite module, characterized in that a light emitting element for generating light is mounted, and then optical fibers are respectively attached to holes provided on opposite side surfaces of the recess so that signal light passes substantially on the same straight line. . 21. The method of assembling an optical composite module according to claim 20, wherein a leaf spring is inserted together with the optical member when the optical member is inserted into the groove. 22. A cylindrical member is attached to a hole provided on opposite side surfaces of a recess, and the cylindrical member and a lens holder holding a lens are bonded by laser welding. A method for assembling the described optical composite module. 23. The method of assembling the optical composite module according to claim 22, wherein the optical base is made of a copper-tungsten alloy. 24. The method of assembling an optical composite module according to claim 20, wherein the optical base is made of a material containing tungsten as a main component.