JP2007103731A - Optical communication module and optical communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a down-sized and low-priced optical communication module. <P>SOLUTION: The optical communication module 1A comprises a surface-emitting semiconductor laser 3 and an end surface emitting semiconductor laser 4 that are contained in a single package 2. The surface-emitting semiconductor laser 3 emits a first wavelength light and is mounted on a first device mounting surface 8a of a device mounting stage 8. The end surface emitting semiconductor laser 4 emits a second wavelength light different from the first wavelength light, and is mounted on a second device mounting surface 8b perpendicular to the first device mounting surface 8a. The axis of the surface-emitting semiconductor laser 3 is substantially parallel with and adjacent to the axis of the end surface emitting semiconductor 4, and the light emitted from the surface-emitting semiconductor laser 3 and light emitted from the end surface emitting semiconductor laser 4 are both condensed by one lens 5 and enter one optical fiber 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical communication module that outputs light having different wavelengths, and an optical communication system including the optical communication module. Specifically, by mounting a surface light emitting element on one surface of an element mounting base having two orthogonal surfaces and mounting an end surface light emitting element on the other surface, the optical axis of light output from each light emitting element Are made close to each other so that light having different wavelengths output from a plurality of light emitting elements can be incident on a single optical fiber with a simple configuration.

  In recent years, the bit rate of transmission speed is increasing in the short-distance communication field where the transmission distance is several meters to several hundred meters. As such a short-distance communication field, for example, in an office or home, a server and a client are connected via the Internet to download contents, or in a home network, a recording device such as a recorder. And a display device such as a display, or a PC (personal computer), or a large-capacity data such as a high-resolution moving image.

  For example, in a usage mode in which a client and a server are connected, there is little need for a high transmission speed in the upload direction from the client to the server, and an improvement in the transmission speed in the download direction from the server to the client is required. Yes.

  When the transmission speed exceeds gigabit, optical communication using an optical fiber is often used. Two-way optical communication usually requires two optical fibers for transmission and reception. However, by multiplexing, bidirectional communication can be performed with one optical fiber. The amount of wiring can be halved.

  In the case of the time division multiplexing method as a multiplexing method, the time is divided between transmission and reception, which becomes a restriction on the transmission rate. On the other hand, in the case of the wavelength multiplexing method, transmission and reception can be performed simultaneously, which is advantageous in terms of transmission speed. A wavelength division multiplexing method is also used as a method for increasing the transmission amount in optical communication.

  An optical communication system using a wavelength division multiplexing system includes a plurality of semiconductor lasers for outputting light having different wavelengths, and a multiplexer for multiplexing the light output from each semiconductor laser into one optical fiber. Has been proposed (see, for example, Patent Document 1).

  Conventionally, in an optical communication system, an optical communication module that includes a semiconductor laser, a lens, and the like and is configured so that an optical fiber can be attached and detached is used. The wavelength multiplexing optical communication system includes a plurality of semiconductor lasers that output light having different wavelengths, a multiplexer that multiplexes light output from each semiconductor laser into one optical fiber, and a semiconductor. In order to condense light output from the laser onto an optical fiber, an optical communication module provided with a lens corresponding to each semiconductor laser is used.

JP 2000-224117 A

  When constructing an optical communication system mainly in an office or home, it is required to reduce the size and cost of the module. However, the conventional optical communication module used in the wavelength division multiplexing method has a problem that it is difficult to reduce the size and the cost because of the large number of parts.

  The present invention has been made to solve such problems, and an object of the present invention is to provide an optical communication module and an optical communication system that can be reduced in size and cost.

  In order to solve the above-described problem, an optical communication module according to the present invention is an optical communication module that outputs light having different wavelengths, and a surface light emitting element that outputs light at a first wavelength, and a first light source that is different from the first wavelength. An end surface light emitting element that outputs light at a wavelength of 2 and two orthogonal surfaces, the surface light emitting element is mounted on one surface, the end surface light emitting element is mounted on the other surface, An element mounting base for holding the end surface light emitting element in a position where the optical axis of the light output from the surface light emitting element and the optical axis of the light output from the end surface light emitting element are close to each other and output from the surface light emitting element A single lens member that collects the light and the light output from the end surface light emitting element and enters the optical fiber is provided.

  In the optical communication module of the present invention, the surface light emitting element outputs light at the first wavelength, and the end surface light emitting element outputs light at the second wavelength different from the first wavelength. The surface light emitting element is mounted on one surface of an element mounting base having two orthogonal surfaces, and the end surface light emitting element is mounted on the other surface of the element mounting base, so that light output from the surface light emitting element is obtained. And the optical axis of the light output from the end surface light emitting element are substantially parallel to each other and close to each other.

  As a result, both the first wavelength light output from the surface light emitting element and the second wavelength light output from the end surface light emitting element are collected by a single lens member, and thus one light. Incident on the fiber.

  An optical communication system according to the present invention includes the above-described optical communication module. That is, an optical communication system according to the present invention includes an optical communication module that outputs light having different wavelengths, an optical reception module that receives light having different wavelengths output from the optical communication module, an optical communication module, and an optical reception module. The optical communication module includes one optical fiber to be connected, and the optical communication module is orthogonal to a surface light emitting element that outputs light at a first wavelength and an end surface light emitting element that outputs light at a second wavelength different from the first wavelength The surface light emitting element is mounted on one surface, and the end surface light emitting element is mounted on the other surface, and the surface light emitting element and the end surface light emitting element are connected to each other. An element mounting base that holds the optical axis and the optical axis of the light output from the edge light emitting element close to each other, condenses the light output from the surface light emitting element and the light output from the edge light emitting element. To optical fiber Characterized by comprising a single lens member morphism.

  In the optical communication system of the present invention, in the optical communication module, the surface light emitting element outputs light at the first wavelength, and the end surface light emitting element outputs light at the second wavelength different from the first wavelength. As described above, the first wavelength light output from the surface light emitting element and the second wavelength light output from the end surface light emitting element are condensed by a single lens member, and thus one optical fiber. Is incident on.

  The light incident on the optical fiber is transmitted through the optical fiber and received by the light receiving module.

  According to the optical communication module of the present invention, by mounting a surface light emitting element on one surface of an element mounting base having two orthogonal surfaces and mounting an end surface light emitting element on the other surface, The optical axis of the output light can be brought close to each other.

  Accordingly, light having different wavelengths output from a plurality of light emitting elements can be incident on one optical fiber with a simple configuration, and the number of components can be reduced. Therefore, it is possible to reduce the size of the optical communication module and reduce the cost of the optical communication module.

  By providing such an optical communication module, a wavelength division multiplexing optical communication system can be constructed at low cost.

  Embodiments of an optical communication module and an optical communication system according to the present invention will be described below with reference to the drawings.

<Configuration example of optical communication module of the present embodiment>
FIG. 1 is a configuration diagram illustrating an example of an optical communication module according to the present embodiment. FIG. 1A is a side view of the optical communication module 1A according to the present embodiment, and FIG. 1B is a front view of the optical communication module 1A. FIG.

  An optical communication module 1A according to the present embodiment includes a surface emitting semiconductor laser (VCSEL) 3 and an edge emitting semiconductor laser 4 in a single package 2, and the surface emitting semiconductor laser 3 and the edge emitting semiconductor laser 4 Light having different wavelengths to be output can be made incident on one optical fiber 6 by one lens 5.

  The package 2 has a form called a CAN package, for example, and includes an element mounting base 8 in the stem portion 7. The stem portion 7 has a disk shape, and an element mounting base 8 protrudes from the surface near the center. The stem portion 7 and the element mounting base 8 are made of metal and are integrally formed by welding, for example.

  The element mounting base 8 has a rectangular parallelepiped shape, and a first element mounting surface 8a is formed at the tip, and a second element mounting surface 8b is formed on a predetermined side surface. The first element mounting surface 8a is configured by a plane substantially parallel to the stem portion 7, and the second element mounting surface 8b is configured by a plane substantially perpendicular to the first element mounting surface 8a. .

  The surface emitting semiconductor laser 3 is an example of a surface emitting element, and converts an input electric signal into light and outputs the light. The surface emitting semiconductor laser 3 outputs light having a short wavelength of about 840 to 860 nm, for example, as the first wavelength λ1.

  The surface emitting semiconductor laser 3 is mounted on the first element mounting surface 8a of the element mounting base 8 by soldering or bonding. That is, the surface-emitting type semiconductor laser 3 has a light emitting point 3a that outputs light at the center position of the stem portion 7 or a position near the center of the stem portion 7 and the first element mounting surface 8a and the first surface. It is mounted at a position as close as possible to the side portion 8c where the two element mounting surfaces 8b intersect.

  The edge-emitting semiconductor laser 4 is an example of an edge-emitting element, and converts an input electrical signal into light and outputs the light. The edge-emitting semiconductor laser 4 is, for example, a Fabry-Perot laser, a DFB (Distributed Feedback) laser, a light emitting diode (LED), and the like. The second wavelength λ2 is, for example, about 770 to 790 nm. Alternatively, light having a short wavelength of about 640 to 660 nm is output.

  The edge emitting semiconductor laser 4 is mounted on the second element mounting surface 8b of the element mounting base 8 by soldering or bonding. That is, the edge-emitting semiconductor laser 4 has a light emitting point 4a for outputting light at a position aligned with the light emitting point 3a of the surface emitting semiconductor laser 3 mounted on the first element mounting surface 8a. The cleaved surface 4b where the light emitting point 4a is exposed is mounted at a position that is substantially flush with the first element mounting surface 8a.

  The edge-emitting semiconductor laser 4 has electrodes formed on both end surfaces in the stacking direction, and the active layer where the light emitting point 4a is formed is biased to one side in the stacking direction. There are many cases. In such a case, the electrode on the side closer to the light emitting point 4a is mounted facing the second element mounting surface 8b of the element mounting base 8, so that the light emitting point from the second element mounting surface 8b. The distance to 4a is made close.

  In the surface emitting semiconductor laser 3, the optical axis of the light S1 output from the light emitting point 3a is substantially perpendicular to the first element mounting surface 8a. Further, in the edge-emitting semiconductor laser 4, the optical axis of the light S2 output from the light emitting point 4a is substantially parallel to the second element mounting surface 8b and to the first element mounting surface 8a. It becomes almost vertical.

  As a result, the optical axis of the light S1 output from the surface emitting semiconductor laser 3 and the optical axis of the light S2 output from the edge emitting semiconductor laser 4 are substantially parallel and close to each other.

  The lens 5 is an example of a lens member. In this example, the lens 5 is composed of a single convex lens. The lens 5 is opposed to the light emitting point 3a of the surface emitting semiconductor laser 3 and the light emitting point 4a of the edge emitting semiconductor laser 4, for example, for the package 2. It is attached to the cap part 2a which comprises.

  The lens 5 receives the light S1 output from the surface emitting semiconductor laser 3 and condenses the light S1 incident from the surface emitting semiconductor laser 3 on the optical fiber 6. The lens 5 receives the light S <b> 2 output from the edge-emitting semiconductor laser 4 and focuses the light S <b> 2 input from the edge-emitting semiconductor laser 4 on the optical fiber 6.

  Here, the optical axis of the light S1 output from the surface emitting semiconductor laser 3 and the optical axis of the light S2 output from the end surface emitting semiconductor laser 4 are close to each other as described above. As a result, the lens 5 is disposed in the vicinity of the center of the lens 5 so that both the optical axis of the surface-emitting semiconductor laser 3 and the optical axis of the edge-emitting semiconductor laser 4 pass. It is preferable that the optical axis of the type semiconductor laser 3 passes through the center of the lens 5.

  The optical fiber 6 is a multimode fiber having a core diameter larger than that of a single mode fiber, for example, a plastic clad fiber (PCF) having a core diameter of about 200 μm or an all plastic fiber (APF) having a core diameter of about 1000 μm.

  The optical fiber 6 is configured to be detachable from the optical communication module 1A by, for example, an optical connector (not shown). Here, in the vicinity of the center of the core 6a of the optical fiber 6, each component is arranged so that the light S1 output from the surface emitting semiconductor laser 3 and the light S2 output from the edge emitting semiconductor laser 4 are condensed. However, the light S1 output from the surface-emitting type semiconductor laser 3 is preferably focused on the center of the core 6a of the optical fiber 6.

  In the optical communication module 1A, four leads 9a to 9d are attached to the stem portion 7 in this example. The three leads 9 a to 9 c are supported by the stem portion 7 via an insulating layer 7 a such as a glass material, and are insulated from the stem portion 7.

  The leads 9a to 9c penetrate the stem portion 7, the lead 9a is connected to one electrode of the surface emitting semiconductor laser 3 by a bonding wire 10a, and the lead 9b is connected to the surface emitting semiconductor laser 3 by a bonding wire 10b. Is connected to the other electrode.

  The lead 9c is connected to one electrode of the edge emitting semiconductor laser 4 by a bonding wire 10c. The remaining lead 9 d is electrically connected to the stem portion 7 and is connected to the other electrode of the edge-emitting semiconductor laser 4 via the element mounting base 8. In the optical communication module 1A of this example, the surface emitting semiconductor laser 3 and the edge emitting semiconductor laser 4 are configured to have independent leads, but the leads may be shared.

  FIG. 2 is an explanatory view showing the positional relationship between the light emitting point 3a of the surface emitting semiconductor laser 3 and the light emitting point 4a of the edge emitting semiconductor laser 4. FIG. 3 shows the outputs from the surface emitting semiconductor laser 3 and the edge emitting semiconductor laser 4. It is explanatory drawing which shows the relationship between the spot of the light and the diameter of the core 6a of the optical fiber 6. FIG.

  The size of the surface emitting semiconductor laser 3 is, for example, about 300 μm in both vertical and horizontal directions as shown in FIG. As described above, the surface-emitting type semiconductor laser 3 is mounted on the first element mounting surface 8a as close as possible to the side 8c where the second element mounting surface 8b intersects. Thereby, the distance from the 2nd element attachment surface 8b to the light emission point 3a of the surface emitting semiconductor laser 3 is about 150 micrometers.

  The distance from the second element mounting surface 8b to the light emitting point 4a of the edge emitting semiconductor laser 4 is about 10 μm. Therefore, the optical axis of the light S1 output from the surface emitting semiconductor laser 3 and the optical axis of the light S2 output from the end surface emitting semiconductor laser 4 are about 160 μm apart.

  When a plastic clad fiber (PCF) is used as the optical fiber 6, the diameter of the core 6 a is about 200 μm. Therefore, the optical axis of the light S 1 output from the surface emitting semiconductor laser 3 and the edge emitting semiconductor laser 4 are used. The optical axis of the light S2 output from the light passes through the core 6a of the optical fiber 6 together.

  As a result, the light S1 output from the surface emitting semiconductor laser 3 is collected by the lens 5, so that the spot light 11a formed on the end surface of the optical fiber 6 and the light output from the end surface emitting semiconductor laser 4 are obtained. By condensing S2 with the lens 5, both the spot lights 11b formed on the end face of the optical fiber 6 enter the core 6a of the optical fiber 6 as shown in FIG.

  Therefore, both the light S1 output from the surface emitting semiconductor laser 3 and the light S2 output from the edge emitting semiconductor laser 4 are incident on the core 6a of the optical fiber 6 and transmitted through the optical fiber 6. Is possible.

  Here, in order for light to be incident on the optical fiber 6 and transmitted, the spot light does not have to be in the center of the core 6a, but may be in the core 6a.

  When an all plastic fiber (APF) is used as the optical fiber 6, the diameter of the core 6 a is about 1000 μm, so that the light S 1 output from the surface emitting semiconductor laser 3 and the edge emitting semiconductor laser 4 are used. Both of the output lights S2 enter the core 6a of the optical fiber 6.

<Operation example of optical communication module of this embodiment>
Next, an example of the operation of the optical communication module 1A of the present embodiment will be described with reference to each drawing.

  In the optical communication module 1 </ b> A, the input electric signal is converted into light by the surface emitting semiconductor laser 3, and the light S <b> 1 output from the surface emitting semiconductor laser 3 enters the lens 5. Here, the oscillation wavelength of the surface emitting semiconductor laser 3 is the first wavelength λ1 (for example, λ1 = 850 nm).

  In the optical communication module 1 </ b> A, the input electrical signal is converted into light by the edge-emitting semiconductor laser 4, and the light S <b> 2 output from the edge-emitting semiconductor laser 4 enters the lens 5. Here, the oscillation wavelength of the edge-emitting semiconductor laser 4 is a second wavelength λ2 (for example, λ2 = 780 nm) different from the first wavelength λ1.

  The lens 5 condenses both the light S1 output from the surface emitting semiconductor laser 3 and the light S2 output from the edge emitting semiconductor laser 4 and causes the light S1 to enter the core 6a of the optical fiber 6. The optical fiber 6 transmits the incident light S1 and S2 to a counter device (not shown).

  As described above, the surface emitting semiconductor laser 3 is mounted on the first element mounting surface 8a of the element mounting base 8, and the edge emitting semiconductor is mounted on the second element mounting surface 8b orthogonal to the first element mounting surface 8a. By mounting the laser 4, the optical axis of the light S 1 output from the surface emitting semiconductor laser 3 and the optical axis of the light S 2 output from the edge emitting semiconductor laser 4 are close to each other, and both are optical fibers 6. It is a distance that can pass through the core 6a.

  As a result, in the optical communication module 1 </ b> A, light having different wavelengths output from the surface-emitting type semiconductor laser 3 and the edge-emitting type semiconductor laser 4 is collected by one lens 5 and is collected in one optical fiber 6. Can be incident.

  Therefore, in the optical communication module 1A, the number of parts can be reduced, so that the size and cost can be reduced. In addition, the optical communication module 1A can be manufactured without a significant increase in cost compared to the cost of manufacturing an optical communication module having one light emitting element. Can be planned.

  In recent years, surface-emitting semiconductor lasers with an oscillation wavelength of 850 nm and a high modulation speed have been put into practical use at low cost. By combining the surface-emitting semiconductor laser 3 and the edge-emitting semiconductor laser 4, the transmission speed can be increased. A wavelength division multiplexing optical communication module can be provided at a low cost at 10 Gbit / second.

  Here, in the present embodiment, the optical communication module that outputs light of two wavelengths has been described. However, a surface emitting semiconductor laser that outputs light having a wavelength different from the first wavelength λ1 and the second wavelength λ2 is used. It may be mounted on the first element mounting surface 8 a of the element mounting base 8 in the vicinity of the surface emitting semiconductor laser 3.

  Further, an edge-emitting semiconductor laser that outputs light having a wavelength different from the first wavelength λ1 and the second wavelength λ2 is placed close to the edge-emitting semiconductor laser 4 on the second element mounting surface 8b of the element mounting base 8. May be implemented.

  Furthermore, both the surface emitting semiconductor laser and the edge emitting semiconductor laser that output light having different wavelengths from the first wavelength λ1 and the second wavelength λ2 and different from each other are mounted on the element mounting base 8. Also good.

  For example, when an all plastic fiber (APF) is used as the optical fiber 6, the diameter of the core 6 a is about 1000 μm, so that light output from three or three or more light emitting elements is used as the core 6 a of the optical fiber 6. Each light emitting element can be mounted so as to be incident on the light source.

  Therefore, the present invention can be applied to an optical communication module that outputs light of three wavelengths or more.

<Configuration example of optical communication system of the present embodiment>
FIG. 4 is a configuration diagram showing an example of the optical communication system according to the present embodiment. The optical communication system 21A according to the present embodiment includes the optical communication module 1A, the optical reception module 22, and the optical fiber 6 that connects the optical communication module 1A and the optical reception module 22. Here, the optical communication module 1A has the same configuration as that described with reference to FIG.

  The optical receiver module 22 includes a plurality of photodiodes 23 a and 23 b, an optical demultiplexer 24, and a lens 25. As shown in FIG. 1, the optical communication module 1A connected to the optical receiver module 22 outputs light of two wavelengths in this example, and therefore the optical receiver module 22 includes two photodiodes 23a and 23b.

  The photodiodes 23a and 23b are examples of light receiving elements, and convert incident light into electrical signals and output them. Since the photodiodes 23a and 23b have no wavelength dependency, it is sufficient to provide two identical photodiodes.

  The optical demultiplexer 24 is configured to transmit, for example, the light with the first wavelength λ1 output from the optical communication module 1A and reflect the light with the second wavelength λ2. One photodiode 23 a is disposed at a position where light transmitted through the optical demultiplexer 24 is incident, and the other photodiode 23 b is disposed at a position where light reflected by the optical demultiplexer 24 is incident.

  The lens 25 is disposed between the optical fiber 6 and the optical demultiplexer 24, and condenses the light emitted from the optical fiber 6 on the photodiode 23a and the photodiode 23b.

  The optical fiber 6 is configured to be detachable from the optical receiving module 22 by, for example, an optical connector (not shown).

<Operation example of optical communication system of the present embodiment>
Next, an example of the operation of the optical communication system 21A of the present embodiment will be described with reference to each drawing.

  In the optical communication module 1A, as described above, the signal light is output at the first wavelength λ1 by the surface emitting semiconductor laser 3, and the signal light at the second wavelength λ2 is output by the edge emitting semiconductor laser 4. Is output.

  The signal light output from the surface emitting semiconductor laser 3 and the signal light output from the edge emitting semiconductor laser 4 are collected by the lens 5 and enter the core 6a from one end face of the optical fiber 6, and the core 6a. Is transmitted.

  The signal light transmitted through the core 6 a of the optical fiber 6 is emitted from the other end face of the optical fiber 6. The signal light emitted from the optical fiber 6 is collected by the lens 25, and the signal light having the first wavelength λ1 passes through the optical demultiplexer 24 and enters one photodiode 23a. In addition, the signal light having the second wavelength λ2 is reflected by the optical demultiplexer 24 and enters the other photodiode 23b.

  The photodiodes 23a and 23b convert the incident signal light into an electric signal and output it.

  In the optical communication system 21 </ b> A described above, the optical communication module 1 </ b> A described above is provided, so that signal light having different wavelengths can be transmitted using one optical fiber 6. Since the optical communication module 1A can reduce the number of parts, and thus can be reduced in size and cost, the wavelength division multiplexing optical communication system 21A can be constructed at low cost.

  The present invention is mainly applied to an optical communication module used when an optical communication system is constructed in an office or home.

It is a block diagram which shows an example of the optical communication module of this Embodiment. It is explanatory drawing which shows the positional relationship of the light emitting point of a surface emitting semiconductor laser, and the light emitting point of an edge surface emitting semiconductor laser. It is explanatory drawing which shows the relationship between the spot of the light output from the surface emitting semiconductor laser and the edge emitting semiconductor laser, and the diameter of the core of an optical fiber. It is a block diagram which shows an example of the optical communication system of this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A ... Optical communication module, 2 ... Package, 2a ... Cap part, 3 ... Surface emitting semiconductor laser, 3a ... Light emitting point, 4 ... End surface emitting semiconductor laser, 4a ..Emission point, 5... Lens, 6 .. Optical fiber, 7... Stem portion, 8... Element mounting base, 8 a... First element mounting surface, 8 b. Element mounting surfaces, 9a to 9d, leads, 10a to 10c, bonding wires, 21A, optical communication system, 22 ... optical receiving modules, 23a, 23b, photodiodes, 24 ...・ Optical demultiplexer, 25 ... Lens

Claims (7)

In optical communication modules that output light with different wavelengths,
A surface emitting device that outputs light at a first wavelength;
An edge-emitting element that outputs light at a second wavelength different from the first wavelength;
The surface light emitting element is mounted on one surface, the end surface light emitting element is mounted on the other surface, and the surface light emitting element and the end surface light emitting element are connected to the surface light emitting element. An element mounting base that holds the optical axis of the light output from and the optical axis of the light output from the end surface light emitting element close to each other, and
An optical communication module comprising: a single lens member that condenses light output from the surface light emitting element and light output from the end surface light emitting element and enters the optical fiber. The optical fiber is a multimode fiber,
The surface light emitting element and the end surface light emitting element are such that both the optical axis of light output from the surface light emitting element and the optical axis of light output from the end surface light emitting element pass through the core of the optical fiber, The optical communication module according to claim 1, wherein the optical communication module is held by the element mounting base. The first wavelength light output from the surface light emitting element is a short wavelength light,
The optical communication module according to claim 1, wherein the second wavelength light output from the end surface light emitting element is light having a short wavelength different from the first wavelength. The optical communication module according to claim 3, wherein the surface emitting element is a surface emitting semiconductor laser, and the end surface emitting element is any one of a Fabry-Perot laser, a distributed feedback laser, and a light emitting diode. 2. The optical communication according to claim 1, wherein the end surface light emitting element is held by the element mounting base in a direction in which a distance between a light emitting point of the end surface light emitting element and a light emitting point of the surface light emitting element is closer. module. Either or both of the surface light emitting element and the edge light emitting element that output light at a wavelength different from the first wavelength and the second wavelength, the optical axes of the light output from each light emitting element are close to each other. The optical communication module according to claim 1, wherein the optical communication module is held on the element mounting base as a position. An optical communication module that outputs light of different wavelengths;
A light receiving module that receives light of different wavelengths output from the optical communication module;
Comprising one optical fiber connecting the optical communication module and the optical receiving module;
The optical communication module is:
A surface emitting device that outputs light at a first wavelength;
An edge-emitting element that outputs light at a second wavelength different from the first wavelength;
The surface light emitting element is mounted on one surface, the end surface light emitting element is mounted on the other surface, and the surface light emitting element and the end surface light emitting element are connected to the surface light emitting element. An element mounting base that holds the optical axis of the light output from and the optical axis of the light output from the end surface light emitting element close to each other, and
An optical communication system comprising: a single lens member that collects light output from the surface light emitting element and light output from the end surface light emitting element and enters the optical fiber.

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