JP2005321651A - Optical communication module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical communication module capable of reducing signal distortion in using a multi-mode laser beam and also reducing deterioration of signal quality due to displacement between an optical fiber and a laser light source. <P>SOLUTION: The optical communication module having the capability includes: a laser light source 13 that oscillates a multi-mode laser beam; a base 11 that is equipped with a positioning means 12 for positioning, relative to the laser light source 13, a multi-mode optical fiber 14 for propagating the laser beam; and a randomizing means 18 that can randomize an incident position when the multi-mode laser beam is made incident on the end face of the multi-mode optical fiber 14. It is solution about the above-mentioned subject. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical communication module suitably used for an optical communication system.

In recent years, development of optical communication systems has been progressing due to the demand for higher speed and higher capacity of information communication.
Such an optical communication system basically has a configuration in which a light emitting element that converts an electrical signal into an optical signal and a light receiving element that converts an optical signal into an electrical signal are connected by an optical fiber. An optical communication module (eg, connector) for optically connecting an optical element and an optical fiber is used to make it possible to attach or detach an optical element such as a light-emitting element or a light-receiving element. Has been. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2000-349307) discloses an optical communication module capable of positioning an optical element and an optical fiber by using a through hole formed in a substrate. In this optical communication module, the optical fiber and the optical element are directly coupled by abutting the optical fiber with the optical element.
JP 2000-349307 A

  By the way, in general, a combination of a surface-emitting type semiconductor laser (VCSEL) and a multimode optical fiber is advantageous for optical transmission over a short distance in terms of communication speed and cost. For a multimode optical fiber, a graded index (GI) fiber with improved dispersion characteristics is usually used to suppress modal dispersion. In the GI fiber, a refractive index distribution is formed so that the refractive index difference becomes smaller in the core as it approaches the cladding. Therefore, when the surface emitting semiconductor laser and the GI fiber are directly coupled as in the optical communication module of Patent Document 1, if the emission angle of the surface emitting semiconductor laser is large, the outer higher-order mode light is coupled to the optical fiber. Inability to do so results in distortion of the signal. Further, when the surface emitting semiconductor laser and the GI fiber are directly coupled, the adjustment margin between the surface emitting semiconductor laser and the GI fiber is small, so that the signal quality is significantly deteriorated due to the positional deviation.

  Accordingly, an object of the present invention is to provide an optical communication module that can reduce signal distortion when using multimode laser light and can reduce signal quality deterioration due to positional deviation between an optical fiber and a laser light source. Yes.

  In order to solve the above problems, the present invention includes a laser light source that oscillates multimode laser light, and positioning means for positioning the multimode optical fiber that propagates the laser light with respect to the laser light source. A base material and an optical path from the laser light source to the multi-mode optical fiber when the multi-mode optical fiber is installed on the base material, and the multi-mode laser light is placed on an end surface of the multi-mode optical fiber There is provided an optical communication module including randomizing means capable of randomizing an incident position when incident.

  According to this configuration, since the incident position when the multimode laser light emitted from the laser light source is incident on the end face of the multimode optical fiber can be randomized, almost all modes of light are incident on the multimode optical fiber. It becomes possible to make it. That is, the optical path of the light including a plurality of modes emitted in a certain direction can be changed before the light of each mode enters the multimode optical fiber, and the light of each mode can be mixed, so almost all It becomes possible to make the light of the mode enter the multimode optical fiber. Therefore, it is possible to enter higher-order mode light that has not conventionally been incident on the multimode optical fiber in relation to the core diameter of the optical fiber. As a result, it is possible to reduce signal distortion due to the fact that laser light of a specific mode is not incident. Also, by mixing the optical paths of multiple modes of laser light, the radiation angle dependency of each mode is eliminated, so the effect on signal quality due to misalignment between the optical fiber and the laser light source can be reduced. It becomes.

  The randomizing means may be made of a translucent resin containing a filler, and the filler and the translucent resin may have different refractive indexes. According to this, since the optical path of the multimode laser light is changed and mixed by the filler by using the refractive index difference between the translucent resin and the filler, the multimode laser light can be mixed with the multimode optical fiber. It is possible to randomize the incident position when entering the end face. As a combination of such a filler and a translucent resin, for example, a combination of silica and an epoxy resin can be given. Here, the translucent resin refers to a resin that can transmit laser light.

  The randomizing means may be composed of a translucent resin containing a filler capable of reflecting light. According to this, since the multimode laser light is reflected and mixed by the filler, the incident position when the multimode laser light enters the end face of the multimode optical fiber can be randomized. Examples of such a filler include a material capable of reflecting laser light such as metal.

  The randomizing means may be an underfill material containing a filler capable of scattering light. According to this, since it becomes possible to serve as an underfill material, it becomes easy to obtain the material, and it is possible to seal the light emitting part of the laser light source, reduce external stress, and improve connection reliability. Become.

  The shape of the filler may be any shape such as a spherical shape, a needle shape, or a polyhedron shape, and is appropriately changed according to the design.

  When the filler is spherical, it is preferable that the average particle diameter of the filler is larger than the wavelength of the laser light and smaller than the light emitting part of the laser light source. According to this, laser light can be reflected / scattered on average, and the balance with attenuation due to light reflection / scattering is excellent.

  The randomizing means is preferably a translucent resin film having fine irregularities on the surface. According to this, when the multi-mode laser light is incident on the translucent resin film, the direction of the laser light of each mode is changed and mixed, so that the multi-mode laser light is the end face of the multi-mode optical fiber. It is possible to randomize the incident position at the time of incidence on.

  It is preferable that the randomizing means is disposed at least in the vicinity of the laser light source. By mixing the light in the vicinity of the laser light source, the incident position when the multimode laser light is incident on the end face of the multimode optical fiber can be randomized more reliably.

  Another aspect of the present invention is a substrate having a through-hole into which a multimode optical fiber can be inserted, a translucent resin film disposed on one side of the substrate and covering the through-hole, and laser light through the through-hole. A laser light source that oscillates a multimode laser beam, positioned on the basis of the through hole so as to be able to transmit, and is installed on the through hole through the translucent resin film, the laser light source, and the translucent light And a scattering member that is disposed between the light emitting resin film and scatters light incident on the multimode optical fiber from the laser light source.

  According to such a configuration, since the multimode laser light emitted from the laser light source can be scattered before reaching the multimode optical fiber, the dependency between the oscillation mode and the incident position on the end face of the optical fiber can be eliminated. Almost all modes of light can be incident on the multimode optical fiber. Therefore, it is possible to reduce signal distortion due to the fact that laser light of a specific mode is not incident. In addition, by changing the optical path of the light in each mode and mixing the light in each mode, there is no dependency on the incident position on the end face of the optical fiber in the oscillation mode. It becomes possible to reduce the influence on quality. Therefore, an optical communication module with little signal distortion and good signal quality can be provided.

  In another aspect of the present invention, a substrate having a through-hole into which a multimode optical fiber can be inserted, and a single surface of the substrate are disposed so as to cover the through-hole, and fine irregularities are formed on the surface opposite to the substrate. A multi-mode resin that is positioned on the basis of the through hole so that the laser beam can be transmitted through the through hole, and installed on the through hole through the translucent resin film. An optical communication module including a laser light source that oscillates laser light.

  According to such a configuration, before the multimode laser light emitted from the laser light source reaches the multimode optical fiber, the traveling direction of the light is changed by the fine unevenness formed on the surface of the translucent resin film, Since optical paths are mixed, almost all modes of light can be incident on the multimode optical fiber. Therefore, it is possible to reduce signal distortion due to the fact that laser light of a specific mode is not incident. Also, by mixing the optical paths of multiple modes of laser light, there is no dependency on the incident position on the end face of the optical fiber of the mode, so the effect on signal quality due to misalignment between the optical fiber and the laser light source is reduced. It becomes possible. Therefore, it is possible to provide an optical communication module having a simple structure with less signal distortion and good signal quality. Note that the fine unevenness formed on the surface of the translucent resin film does not necessarily have to be formed on the entire surface opposite to the substrate, and may be formed at least on the optical path of the laser beam.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view of the optical communication module according to the first embodiment of the present invention, and FIG. 2 is a partially enlarged view of the optical communication module according to the first embodiment. As shown in FIG. 1, the optical communication module of this embodiment includes a base material 11, a through hole 12, a laser light source 13, a translucent resin film 16, a wiring film 17, and randomizing means 18.

  The base material 11 supports each element constituting the optical communication module and has a through hole 12 into which the multimode optical fiber 14 can be inserted. The base material 11 can be configured using various materials such as conductive materials such as stainless steel, aluminum, and copper, and non-conductive materials such as glass, resin, and ceramics. In the present embodiment, a ceramic substrate is used as the base material 11.

  The through-hole 12 is formed in a shape that does not cause a substantial gap between the ferrule 15 and the ferrule 15 provided around the multimode optical fiber 14. As a result, the multimode optical fiber 14 can be fixed in the through hole 12 and can be aligned with the laser light source 13. In addition, when the ferrule 15 is not provided in the multimode optical fiber 14, the through-hole 12 according to the shape of the multimode optical fiber 14 is formed.

  The laser light source 13 is disposed on the through hole 12 through the translucent resin film 16, and includes signal light including laser light of a plurality of modes toward the multimode optical fiber 14 inserted into the through hole 12. Is emitted. As such a laser light source 13, for example, a light emitting element such as a surface emitting semiconductor laser (VCSEL) is used. In this embodiment, a VCSEL (for example, wavelength 850 nm) is flip-chip bonded to the translucent resin film 16 face down. The laser light source 13 is positioned with reference to the through hole 12, the multimode optical fiber 14, or the ferrule 15.

  The multimode optical fiber 14 is an optical fiber capable of propagating a plurality of modes, and plays a role of propagating the multimode laser light oscillated from the laser light source 13 to another. In the present embodiment, a graded index (GI) type multimode optical fiber (hereinafter also referred to as GI fiber) is used as the multimode optical fiber 14. The core 20 of the GI fiber is formed such that the refractive index decreases substantially continuously as it goes away from the center, and has the same refractive index as the cladding at the boundary with the cladding.

  The translucent resin film 16 is disposed on one surface of the substrate 11 so as to cover the entire through hole 12. The laser light source 13 and the multimode optical fiber 14 are optically coupled via the translucent resin film 16. The translucent resin film 16 can be formed using, for example, a resin that transmits light, such as polyimide or epoxy resin. A polyimide film is preferably used from the viewpoints of good light transmission, flexibility and easy handling. Further, the bonding surface between the translucent resin film 16 and the multimode optical fiber 14 is free of a gap therebetween, and the refractive index between the multimode optical fiber 14 and the translucent resin film 16 is matched, A refractive index matching material (so-called matching oil) for preventing light loss due to scattering of the optical signal may be penetrated. Thereby, the optical coupling efficiency can be increased. In addition, as a refractive index matching material, the epoxy resin etc. which have the translucency similar to the underfill material mentioned later, etc. can be used, for example. Further, when FPC is used for the translucent resin film, an adhesive or an adhesive sheet for bonding the FPC and the substrate may be used as the refractive index matching material.

  The wiring film 17 is responsible for signal transmission between the laser light source 13 and an external electronic circuit (external circuit) (not shown) disposed on the external substrate, and transmits light using a conductor such as copper. The conductive resin film 16 is formed in a predetermined shape (wiring pattern). In order to cope with the high-speed operation of the laser light source 13, it is preferable to configure a microstrip line suitable for transmission of a high-frequency signal including the translucent resin film 16 and the wiring film 17.

  The randomizing means 18 randomizes the incident position when the multimode laser light is incident on the end face of the multimode optical fiber 14, and the multimode optical fiber 14 is installed in the through hole 12 of the substrate 11. In this case, it is arranged on the optical path from the laser light source 13 to the multimode optical fiber 14. In the present embodiment, a member that can reflect, refract, and scatter light is used as the randomizing means 18. Here, an example in which a translucent resin containing the filler 21 is used as a scattering member capable of scattering light will be described. As the filler 21, for example, a member having a refractive index different from that of the translucent resin, a member capable of reflecting laser light, or the like is used. More specifically, inorganic fillers, such as a silica and a metal, are mentioned. The shape of the filler 21 is not particularly limited, and may be any shape such as a spherical shape, a needle shape, or a polyhedral shape, and is appropriately changed according to the design. When the filler 21 is spherical, the average particle diameter of the filler is preferably larger than the wavelength of the laser light and smaller than the light emitting portion 19 of the laser light source 13. According to this, laser light can be reflected / scattered on average, and the balance with attenuation due to light scattering is excellent. More specifically, for example, one having a size of 1/5 to 1/10 or less of the size of the light emitting portion 19 of the laser light source 13 and an average particle diameter of 1 μm or less can be mentioned. In addition, when the filler 21 is acicular, it is preferable that the diameter of a filler exists in the said range. Moreover, as translucent resin, resin which can permeate | transmit laser beams, such as an epoxy resin, is used, for example. The translucent resin may be a so-called underfill material used for the purpose of sealing the light emitting portion 19 of the laser light source, reducing external stress, and improving connection reliability. An example of such randomizing means 18 is a mixture of about 20% by weight of silica having an average particle size of about 1 μm in an underfill material made of a transparent epoxy one-component thermosetting resin.

Next, the randomizing means 18 will be described from the viewpoint of optical coupling between the VCSEL and the GI fiber.
The numerical aperture (NA) of the core 20 of the GI fiber is the largest at the center, gradually decreases with distance from the center, and becomes zero at the boundary with the cladding. For example, the NA distribution of a GI fiber having a core diameter of 50 μm and NA of 0.21 (in air, 12.1 degrees on one side) is expressed by the following formula (1).

（Ｒ：中心からの距離（μｍ））

(R: Distance from the center (μm))

  When direct coupling (direct coupling) between the VCSEL and the GI fiber is performed, depending on the distance between the VCSEL and the GI fiber, the outer beam with a large radiation angle exceeds the NA limit of the GI fiber, and optical coupling cannot be performed. A light component may occur (see FIG. 2, where the dotted line indicates the maximum emission angle of the VCSEL). Usually, in a VCSEL that oscillates in a multimode, there is a dependency between an oscillation mode and a radiation angle, and a specific mode is emitted at a specific angle. In general, the higher the mode, the larger the radiation angle tends to be. Here, if all the light emitted at a radiation angle greater than a specific angle cannot be incident, a specific mode (especially a higher mode) cannot be incident. It will be. Since the light emission characteristic (IL characteristic) of the laser beam is determined by the sum of the light amounts of all modes, if the specific mode cannot be incident in this way, the IL characteristic is distorted and transmitted as a result. There is a problem that the optical signal is distorted.

  The radiation angle that can be coupled to the GI fiber is obtained from the above equation (1) and the following NA definition equation (2).

（Ｄ：空気中におけるレーザ光源−ファイバ間の光学距離（μｍ））

(D: Optical distance (μm) between laser light source and fiber in air)

  Here, for example, the emission angle (numerical aperture NA) of the VCSEL is NA = 0.25 (in air, 14.5 degrees on one side), and the optical distance L from the emission point of the VCSEL to the entrance (end face) of the GI fiber is When L = 70 μm (in air), only light within R = 12.8 μm and NA = 0.18 (in air, 10.4 degrees on one side) is coupled. Further, since the emission part of the VCSEL has a circular shape with a diameter of about 10 μm, for example, the effective NA is further reduced.

  Here, if a positional shift occurs between the VCSEL and the GI fiber, the light beam that can be optically coupled is further limited. Therefore, considerable accuracy is required for position adjustment between the VCSEL and the GI fiber.

  However, according to the randomizing means 18 as described above, before the laser light emitted from the VCSEL reaches the GI fiber, the radiation angle is expanded by reflection / scattering, and the optical path of the light in each mode is changed. It becomes possible to eliminate the dependency of the radiation angle and the oscillation mode. Therefore, almost all modes of light can be coupled with the GI fiber little by little, mode deviation is reduced, and distortion of the transmitted signal is improved.

  According to this embodiment, since the incident position when the multimode laser light emitted from the laser light source is incident on the end face of the multimode optical fiber can be randomized, almost all modes of light are transmitted to the multimode optical fiber. It becomes possible to make it enter. That is, the optical path of the light including a plurality of modes emitted in a certain direction can be changed before the light of each mode enters the multimode optical fiber, and the light of each mode can be mixed, so almost all It becomes possible to make the light of the mode enter the multimode optical fiber. Therefore, it is possible to enter higher-order mode light that has not conventionally been incident on the multimode optical fiber in relation to the core diameter of the optical fiber. As a result, it is possible to reduce signal distortion due to the fact that laser light of a specific mode is not incident. Also, by mixing the optical paths of multiple modes of laser light, the radiation angle dependency of each mode is eliminated, so the effect on signal quality due to misalignment between the optical fiber and the laser light source can be reduced. It becomes. Therefore, it is possible to increase the adjustment margin when adjusting the position of the optical fiber and the laser light source.

  In addition, in a laser light source such as a VCSEL, the oscillation mode is disturbed by return light, noise is generated, and signal characteristics may be affected. However, by using a translucent resin containing a filler as the randomizing means, the return light is scattered and minute light returns on average, so that the oscillation mode is stabilized. In addition, the influence on the oscillation mode due to the return light from the other reflecting surfaces can be similarly reduced.

  Normally, from the viewpoint of eye safety (safety for the retina of the eye), a communication system including a laser light source such as a VCSEL driven under a high-speed driving condition may cause harm to the eyes even if the laser beam is directly viewed on the optical path. In many cases, an attenuator (attenuator) is arranged so as not to give it. However, according to the present embodiment, the amount, type, shape, and the like of the filler contained in the translucent resin are appropriately selected by utilizing the fact that light is reflected / scattered and attenuated by the randomizing means. As a result, the amount of light can be attenuated. Therefore, an optical module that does not require an attenuator, has little signal distortion, and can perform high-quality and high-speed transmission can be provided.

  An optical fiber piece 22 for relaying optical coupling between the laser light source and the multimode optical fiber may be formed in the through hole 12. FIG. 3 is a diagram illustrating an optical communication module as a modification of the present embodiment. As shown in FIG. 3, the optical communication module includes an optical fiber piece 22, and the optical fiber piece 22 also includes a GI fiber piece and a light source when the optical fiber piece 22 includes a GI fiber piece and a ferrule formed around the GI fiber piece. The same effect as described above can be obtained by using randomizing means between the two.

(Second Embodiment)
In the first embodiment, the case where the translucent resin containing the filler 21 is used as the randomizing means 18 has been described. In the present embodiment, the case where a translucent resin film having fine irregularities formed on the surface is used as the randomizing means 18 will be described.

FIG. 4 is a partially enlarged view of the optical communication module according to the second embodiment.
In the optical communication module of the present embodiment, the surface of the translucent resin film 16 in the first embodiment formed with fine irregularities is used as the randomizing means 18, and the translucent resin containing the filler 21 is used. The configuration is the same as that of the first embodiment except for the absence.

  As shown in FIG. 4, the optical path of the laser light including a plurality of modes emitted from the light emitting unit 19 of the laser light source 13 is changed by the fine unevenness 24 formed on the surface of the translucent resin film 16. The As a result, the dependency between the oscillation mode and the incident position on the end face of the optical fiber can be eliminated, and the incident position of each mode at the end of the GI fiber can be randomized.

  The fine irregularities 24 formed on the translucent resin film 16 may be formed by etching, and the irregularities are formed on the surface of the translucent resin film 16 by using a metal having fine irregularities on the surface. You may form by transferring. The height of the unevenness is not particularly limited and can be appropriately changed depending on the design. For example, the surface roughness pitch is preferably about 1 μm or less. According to this, it becomes possible to reflect, refract, scatter, diffract, etc. the light of each mode more uniformly, and to reduce the mode bias.

  In order to scatter light or the like, a refractive index difference is required at the interface. Therefore, it is not necessary to interpose an underfill material between the laser light source 13 and the translucent resin film 16, but in the case of interposing an underfill material, there is a difference in refractive index from the translucent resin film 16. It is preferable to use a larger one. Specifically, for example, when polyimide (refractive index: 1.67) is used as the translucent resin film 16, an acrylic resin (refractive index: 1.47) can be used as the underfill material. .

  According to the present embodiment, it is possible to provide an optical communication module that can transmit a high-quality signal at high speed with little signal distortion.

(Third embodiment)
In the first embodiment, an example in which a translucent resin (also referred to as a filler-containing translucent resin) containing a filler as a randomizing unit is disposed between the laser light source 13 and the translucent resin film 16. Explained. However, the present invention is not limited to this, and the filler-containing translucent resin as the randomizing means may be disposed between the laser light source 13 and the multimode optical fiber 14 as in the present embodiment.

  FIG. 5 is a diagram for explaining the optical communication module according to the third embodiment. As described above, since the gap between the laser light source 13 and the multimode optical fiber 14 is filled with the filler-containing translucent resin, it is possible to reduce the mode deviation of the light incident on the multimode optical fiber 14. It becomes.

(Fourth embodiment)
In the present embodiment, an example in which the laser light source 13 and the multimode optical fiber 14 are optically coupled via the lens unit 25 will be described.

FIG. 6 is a diagram for explaining the optical communication module according to the fourth embodiment.
As shown in FIG. 6, in the present embodiment, a lens portion 25 for condensing the laser light oscillated from the laser light source 13 is formed on the optical path on the base material 11. As a material constituting the substrate 11, a lens part can be formed, for example, a transparent resin (eg, epoxy resin) or optical glass (eg, quartz glass, borosilicate glass, etc.) with respect to the wavelength of the laser beam. Is used. The base material 11 can be integrally molded by injection molding such a resin or optical glass with a mold.

Through the lens unit 25, the efficiency of optical coupling between the laser light source 13 and the multimode optical fiber 14 is improved.
In addition, by using the filler-containing translucent resin as the randomizing means 18, the multimode optical fiber can also transmit an optical component that cannot enter the effective range determined by the numerical aperture of the lens unit 25 and cannot be coupled by the lens unit 25. Therefore, the signal distortion can be further improved.

  The filler-containing translucent resin is preferably arranged in the vicinity of the light emitting portion 19 of the laser light source 13. According to this, compared to the case where the multimode optical fiber 14 is disposed in the vicinity of the end face, it is possible to suppress the spread of the emitted light, and thus it is possible to minimize a decrease in coupling efficiency.

FIG. 1 is a cross-sectional view of the optical communication module according to the first embodiment. FIG. 2 is a partially enlarged view of the optical communication module according to the first embodiment. FIG. 3 is a diagram illustrating an optical communication module as a modification of the first embodiment. FIG. 4 is a partially enlarged view of the optical communication module according to the second embodiment. FIG. 5 is a diagram for explaining the optical communication module according to the third embodiment. FIG. 6 is a diagram for explaining the optical communication module according to the fourth embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Base material, 12 ... Through-hole, 13 ... Laser light source, 14 ... Multimode optical fiber, 15 ... Ferrule, 16 ... Translucent resin film, 17 ... Wiring film, 18 ... randomizing means, 19 ... light emitting part, 20 ... core, 21 ... filler, 22 ... optical fiber piece, 24 ... irregularities, 25 ... lens part

Claims (9)

A laser light source that oscillates multimode laser light;
A base material provided with positioning means for positioning the multimode optical fiber propagating the laser light with respect to the laser light source;
When the multimode optical fiber is installed on the substrate, the multimode optical fiber is disposed on an optical path from the laser light source to the multimode optical fiber, and the multimode laser light is incident on an end surface of the multimode optical fiber. Randomizing means capable of randomizing the incident position;
An optical communication module comprising:   The optical communication module according to claim 1, wherein the randomizing unit is made of a translucent resin containing a filler, and the filler and the translucent resin have different refractive indexes.   The optical communication module according to claim 1, wherein the randomizing unit is made of a translucent resin containing a filler capable of reflecting light.   The optical communication module according to claim 1, wherein the randomizing means is an underfill material containing a filler capable of scattering light.   5. The optical communication module according to claim 2, wherein the filler is spherical, and an average particle diameter of the filler is larger than a wavelength of the laser light and smaller than a light emitting portion of the laser light source.   The optical communication module according to claim 1, wherein the randomizing means is a translucent resin film having fine irregularities on the surface.   The optical communication module according to claim 1, wherein the randomizing unit is disposed at least in the vicinity of the laser light source. A substrate having a through-hole into which a multimode optical fiber can be inserted;
A translucent resin film disposed on one side of the substrate and covering the through hole;
A laser light source that oscillates multimode laser light, positioned on the through hole through the translucent resin film, positioned on the basis of the through hole so that laser light can be transmitted through the through hole;
A scattering member that is disposed between the laser light source and the translucent resin film and scatters light incident on the multimode optical fiber from the laser light source,
An optical communication module comprising: A substrate having a through-hole into which a multimode optical fiber can be inserted;
A translucent resin film disposed on one side of the substrate so as to cover the through-hole, and having fine irregularities formed on the surface opposite to the substrate;
A laser light source that oscillates multimode laser light, positioned on the through hole through the translucent resin film, positioned on the basis of the through hole so that laser light can be transmitted through the through hole;
An optical communication module comprising:

Images