JP5856016B2 - Optical module - Google Patents

Description

  The present invention relates to an optical module that can have excellent safety even when emitting high intensity light.

  As one of the optical modules, an optical module in which laser light emitted from a laser element is emitted via an optical fiber is known. In this optical module, generally, light emitted from a laser element arranged in a housing is propagated through an optical fiber led out from the housing to the outside of the housing, and light is emitted from the optical fiber.

  Patent Document 1 listed below describes such an optical module. In this optical module, light is incident on the core of the optical fiber, and this light propagates through the core. For example, light that is incident on the clad from the core is emitted out of the optical fiber by a predetermined means, for example, because a part of the light component exceeds the numerical aperture (NA) of the core.

Japanese Patent Laid-Open No. 2004-354771

  However, in the optical module described in Patent Document 1, although light that does not exceed the numerical aperture of the core among the light that enters the core from the laser element, there is light substantially equal to the numerical aperture of the core. Since this light does not exceed the numerical aperture of the core, it propagates through the core. However, the light component substantially equal to the numerical aperture of the core exceeds the numerical aperture of the core at the portion where the optical fiber is bent, and propagates from the core to the cladding. The light propagated to the cladding is absorbed by the coating layer, and the coating layer is overheated. As described above, the coating layer of the optical fiber may be overheated at the portion where the optical fiber is bent. Since the position where the optical fiber is bent varies depending on the use state of the optical fiber, the optical fiber may be overheated at an unplanned part. In particular, when the intensity of light emitted from the optical module is high, the heating of the coating layer may be a problem from the viewpoint of safety. There is also a need for an optical module having better safety.

  Accordingly, an object of the present invention is to provide an optical module that can have excellent safety even when light having high intensity is emitted.

  In order to solve the above problems, an optical module of the present invention includes a housing, an optical fiber holder that is fixed to the housing and has a through hole that communicates from the inside to the outside of the housing, and the inside of the housing. A laser element that emits laser light, and a core, and an optical fiber strand in which light emitted from the laser element enters the core; a core that is connected to the optical fiber strand And an optical fiber partially inserted into the through hole, wherein the numerical aperture of the core of the optical fiber strand is smaller than the numerical aperture of the core of the optical fiber, and the optical fiber strand And the optical fiber connecting portion is located in the through hole of the optical fiber holder.

  In such an optical module, since the numerical aperture of the core of the optical fiber is smaller than the numerical aperture of the core of the optical fiber, the light does not exceed the numerical aperture of the core of the optical fiber. The light component equivalent to the numerical aperture of the optical fiber cannot propagate through the core of the optical fiber, and is emitted from the side surface direction of the optical fiber. That is, when there is no optical fiber as in the conventional optical module as described above, unnecessary light emitted from the laser element and absorbed by the coating layer of the optical fiber is removed in advance. Therefore, even when the optical fiber is coated with the coating layer, the coating layer can be prevented from being overheated. Accordingly, even when light having a high intensity is emitted, excellent safety can be obtained.

  Moreover, the connection part of an optical fiber strand and an optical fiber is located in the through-hole of an optical fiber holder. Therefore, according to the optical module of the present invention, unnecessary light emitted from the side surface direction of the optical fiber can be prevented from being emitted from an unplanned place, and the safety can be further improved. Can do.

  Further, in the above optical module, the optical fiber holder includes a frame body that is fixed to the housing and has a through hole that communicates with the housing, and a ferrule that is inserted into the through hole of the frame body. It is preferable that the through-hole of the optical fiber holder in which a connection portion between the optical fiber and the optical fiber is located is formed in the ferrule.

  By inserting the optical fiber strand into the through hole of the ferrule, the relative position between the end portion of the optical fiber strand and the laser element can be more appropriately fixed, and the laser element is appropriately emitted. Light can be incident on the core of the optical fiber.

  In this case, it is more preferable that the casing and the frame body are made of metal, and the ferrule is made of a light transmissive material.

  If the ferrule is light transmissive, unnecessary light emitted from the side surface of the optical fiber is transmitted through the ferrule and absorbed by a metal casing or frame. Therefore, unnecessary light removed by the optical fiber can be prevented from being emitted outside the optical module. Since the casing and the frame are made of metal, the heat generated by the absorbed light can be efficiently conducted. An optical module that emits light emitted from a laser element from an optical fiber like the optical module of the present invention is used in a state where it is connected to a cooling member. Conduction from the body to the cooling member can prevent the optical module from being damaged by heat. Further, heat is generated at a position separated from the optical fiber or the optical fiber by at least the ferrule. For this reason, an optical fiber strand and an optical fiber can be protected more appropriately from heat.

  Further, the light transmissive material preferably exhibits light scattering properties. In this case, the light emitted from the side surface of the optical fiber can be prevented from being concentrated and irradiated on a part of the housing or the optical fiber holder. Accordingly, it is possible to prevent a part of the housing and the optical fiber holder from being heated intensively, and it is possible to provide an optical module with higher safety.

  In addition, it is preferable that one end of the ferrule protrudes into a space in the casing, and a connection portion between the optical fiber and the optical fiber is located in a portion protruding into the casing of the ferrule.

  In this case, the optical fiber strand is located in a space in the housing, and unnecessary light emitted from the side surface of the optical fiber strand is absorbed by the inner wall of the housing through the ferrule. An optical module that emits light emitted from a laser element from an optical fiber, like the optical module of the present invention, is used in a state where the casing is connected to a cooling member as described above. As a result, heat can be released faster than heat is generated in the optical fiber holder, and the optical fiber fixed to the pipe can be appropriately protected from heat.

  Or the connection part of the said optical fiber strand and the said optical fiber may be located in the said through-hole of the said frame.

  In this case, since at least a part of the optical fiber is located in the frame, at least a part of unnecessary light emitted from the side surface of the optical fiber is absorbed by the inner wall of the frame through the ferrule. The Then, heat can be released from the frame through the housing in the same manner as described above.

  The ferrule may be made of metal.

  As described above, according to the present invention, there is provided an optical module that can have excellent safety even when light having a high intensity is emitted.

It is a figure which shows the structure of the optical module which concerns on embodiment of this invention. It is a figure which expands the ferrule of FIG. 1, and its periphery.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an optical module according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an optical module according to an embodiment of the present invention. Specifically, FIG. 1 is a cross-sectional view showing a structure when the optical module is viewed from the side. As shown in FIG. 1, the optical module 1 includes a housing 10, a pipe 20 as a frame connected to the housing 10, a ferrule 30 inserted into a through hole of the pipe 20, and a through hole of the ferrule 30. An optical fiber 40 inserted into the optical fiber 50, an optical fiber 50 partially inserted into the through-hole of the ferrule 30, a laser mount 61 disposed in the housing 10, and a laser disposed on the laser mount 61. The element 62 is provided as a main configuration. Since the ferrule 30 is inserted into the pipe 20 in this way and the optical fiber strand 40 and a part of the optical fiber 50 are inserted into the ferrule 30, the optical fiber strand 40 and the optical fiber 50 are held. In this embodiment, the pipe 20 and the ferrule 30 as a frame body constitute an optical fiber holder. In FIG. 1, for ease of understanding, only the casing 10, the pipe 20, and the ferrule 30 are shown in cross section, and the laser mount 61 and the laser element 62 are simply shown as having a rectangular parallelepiped shape. ing.

  In the present embodiment, the housing 10 is made of metal and has a hollow, substantially rectangular parallelepiped shape. Specifically, the housing 10 has a top wall 11 and a bottom wall 12, and a side wall 13 sandwiched between the top wall 11 and the bottom wall 12, and a space is formed by these walls. Further, an opening is formed in a specific side wall 13 of the housing 10.

  Moreover, in this embodiment, the pipe 20 consists of a metal pipe body in which the through-hole H2 was formed. The pipe 20 is fitted into the opening of the side wall 13 described above, so that one end is fixed to the housing 10 and the other end extends to the outside of the housing 10. Therefore, the through hole H <b> 2 of the pipe 20 communicates with the inside of the housing 10. The pipe 20 may be molded separately from the housing 10 as described above and connected to the side wall 13 of the housing 10, or may be molded integrally with the housing 10.

  The laser mount 61 is a table for adjusting the height of the laser element 62 and is fixed to a predetermined position on the bottom wall 12 of the housing 10 by, for example, soldering. The laser mount 61 may be provided separately from the housing 10 and fixed to the housing 10 as described above, or may be molded integrally with the housing 10.

  The laser element 62 is fixed on the laser mount 61 with solder or the like. In the laser element 62 of the present embodiment, a plurality of semiconductor layers are stacked, and a resonator structure is formed by these semiconductor layers. Then, for example, laser light having a wavelength of 900 nm band is emitted from the surface of the laser element 62 on the pipe 20 side.

  The ferrule 30 has a cylindrical shape in which a through hole H3 is formed along the central axis. The ferrule 30 is formed longer than the pipe 20, with one end portion 36 protruding into the housing 10 and the other end portion 37 slightly protruding from the pipe 20, in the through hole H 2 of the pipe 20. Has been inserted. The outer diameter of the ferrule 30 is substantially the same as the inner diameter of the pipe 20, and the ferrule 30 is fixed to the inner wall of the pipe 20 with an adhesive or the like. Moreover, in this embodiment, the ferrule 30 is comprised from the light transmissive material, and also this material is set as the structure which exhibits light-scattering property. Examples of such a material include zirconia and foamable glass.

  FIG. 2 is an enlarged view of the ferrule 30 of FIG. 1 and its periphery. As shown in FIG. 2, the optical fiber 40 includes a core 41 and a clad 42 that surrounds the outer peripheral surface of the core 41 without a gap, and does not have a coating layer that covers the clad 42. The core 41 is made of quartz to which a dopant for increasing the refractive index, such as germanium, is added. For example, the clad 42 is made of quartz in which a dopant added to the core 41 is added at a lower content than the core 41, and has a refractive index lower than that of the core 41.

  In addition, the optical fiber 40 has one end flush with the one end 36 of the ferrule 30 in a state where the optical fiber 40 is entirely inserted into the through hole H3 of the ferrule 30 as described above. The laser beam L emitted from the laser element is accurately aligned with the position facing the emission surface of the laser element 62 so as to enter the core 41. Note that a lens that collimates the laser light L emitted from the laser element 62, a condensing lens, or the like may be disposed between the laser element 62 and the optical fiber 40. These lenses are omitted.

  In the present embodiment, the refractive index of the clad 42 is set lower than the refractive index of the ferrule 30. Therefore, the light propagating to the clad 42 is configured to easily propagate to the ferrule 30.

  The optical fiber 50 includes a core 51, a clad 52 that surrounds the outer peripheral surface of the core 51 without a gap, and a coating layer 53 that covers the outer peripheral surface of the clad 52. For example, the core 51 is made of the same material as that of the core 41 of the optical fiber 40, and the core 41 and the core 51 have the same refractive index. The clad 52 is made of, for example, pure quartz to which no dopant is added, and has a refractive index lower than that of the core 51. The covering layer 53 is, for example, a single layer or two or more resin layers formed from an ultraviolet curable resin or the like.

  The numerical aperture of the core 41 of the optical fiber 40 is made lower than the numerical aperture of the core 51 of the optical fiber 50. Thus, in order for the numerical aperture of the core 41 of the optical fiber 40 to be lower than the numerical aperture of the core 51 of the optical fiber 50, the relative refractive index difference with respect to the cladding 42 of the core 41 of the optical fiber 40 is What is necessary is just to make it smaller than the relative refractive index difference with respect to the clad 52 of the core 51 of the optical fiber 50. Thus, in order to change the relative refractive index difference between the core and the clad between the optical fiber 40 and the optical fiber 50, for example, the optical fiber 40 and the optical fiber 50 may be configured as described above. The clad 42 and the clad 52 are made of pure quartz and have the same refractive index. The amount of dopant added to the core 51 of the optical fiber 50 is larger than the amount of dopant added to the core 41 of the optical fiber 40. The amount may be increased so that the refractive index of the core 51 may be higher than the refractive index of the core 41.

  Further, as shown in FIG. 2, the coating layer 53 is separated from the one end of the optical fiber 50 by a predetermined distance, and the portion where the coating layer 53 of the optical fiber 50 is separated is a through hole of the ferrule 30. It is inserted in H3. One end of the optical fiber 50 is connected to the other end of the optical fiber 40 by fusion in the through hole H3 of the ferrule 30, and the optical fiber 50 is connected to the core 41 of the optical fiber 40 and the light. The core 51 of the fiber 50 is optically coupled. For such a configuration, the optical fiber 40 and the optical fiber 50 may be inserted into the through hole H3 of the ferrule 30 after the optical fiber 40 and the optical fiber 50 are fused. In the present embodiment, the connection portion CN between the optical fiber 40 and the optical fiber 50 is located at a portion of the through hole H3 of the ferrule 30 that protrudes into the space of the housing 10 of the ferrule 30 described above. To do. Therefore, the entire optical fiber 40 is located at a portion protruding into the housing 10 of the ferrule 30 described above.

  Further, the end portion of the coating layer 53 of the optical fiber 50 is located in the vicinity of the other end portion 37 of the ferrule 30 and is fixed to the other end portion 37 of the ferrule 30 by a fixing resin 63. Thus, the portion of the optical fiber 50 from which the coating layer 53 has been peeled is protected by the ferrule 30 and the fixing resin 63, and the optical fiber 50 is prevented from being broken.

  Next, the optical operation and action of the optical module 1 having the above configuration will be described.

  Like the optical module 1 of the present embodiment, an optical module that emits light emitted from the laser element 62 from the optical fiber 50 is used in a state where the housing 10 is connected to a cooling member. More specifically, the bottom wall 12 of the housing 10 is used while being fixed to a cooling member (not shown).

  First, as indicated by broken lines in FIGS. 1 and 2, the laser light L is emitted from the laser element 62 and enters the core 41 of the optical fiber 40. Among the light incident on the core 41, some components of the light are incident below the numerical aperture of the core 41, and other partial components of the light are incident beyond the numerical aperture of the core 41.

  Light that enters the core 41 beyond the numerical aperture of the core 41 of the optical fiber 40 leaks from the core 41 and propagates to the clad 42, and further propagates from the clad 42 to the ferrule 30. As described above, the ferrule 30 is light transmissive, and further exhibits light scattering properties. Therefore, the light incident on the ferrule 30 propagates through the ferrule 30 while being repeatedly scattered. If the refractive index of the ferrule 30 is equal to or higher than the refractive index of the cladding 42 of the optical fiber 40 as described above, it is preferable because light leaking from the core 41 easily propagates from the cladding 42 to the ferrule 30. Then, as shown by a dotted line in FIG. 2, the scattered light is emitted from the ferrule 30.

  The light emitted from the ferrule 30 propagates to the inner wall of the housing 10 and is absorbed by the housing 10 and converted into heat. The heat generated in the housing 10 is conducted to the bottom wall 12 of the housing 10 and is absorbed from the bottom wall 12 by a cooling member (not shown).

  On the other hand, light incident at a numerical aperture equal to or less than the core 41 propagates through the core 41 and enters the core 51 of the optical fiber 50. As described above, since the numerical aperture of the core 41 of the optical fiber 40 is smaller than the numerical aperture of the core 51 of the optical fiber 50, the light propagating from the core 41 of the optical fiber 40 to the core 51 of the optical fiber 50. Propagates through the core 51 without leaking from the core 51 of the optical fiber 50. Moreover, the light incident on the core 51 from the core 41 does not contain a component that is equivalent to the numerical aperture of the core 51. Therefore, the light propagating through the core 51 is suppressed from exceeding the numerical aperture of the core 51 even when the optical fiber 50 is bent halfway. Therefore, leakage of light from the core 51 is suppressed.

  As described above, according to the optical module of the present embodiment, even when the optical fiber 50 is bent, the leakage of light from the core 51 is suppressed, so that the covering layer 53 can be prevented from generating heat. it can. Accordingly, even when light having a high intensity is emitted, excellent safety can be obtained.

  In addition, since the connection portion CN between the optical fiber 40 and the optical fiber 50 is located closer to the housing 10 than the end of the pipe 20 opposite to the housing 10 side, it is emitted from the optical fiber 40. The light that leaks out does not leak to the outside, and the safety can be improved.

  Further, in the present embodiment, since the entire optical fiber 40 is located in the space in the housing 10, unnecessary light emitted from the optical fiber 40 is generated on the inner wall of the metal housing 10. It is absorbed and heat is generated in the housing 10. By generating heat in the housing 10 in this way, heat can be released faster than heat is generated in the pipe 20. For this reason, the optical fiber fixed to the pipe can be appropriately protected from heat.

  Further, since the ferrule 30 is light transmissive, heat is generated at a position away from the optical fiber 40 and the optical fiber 50. For this reason, the optical fiber strand 40 and the optical fiber 50 can be appropriately protected from heat.

  Furthermore, since the ferrule 30 exhibits light scattering properties, it is possible to prevent the light emitted from the optical fiber strand 40 from being concentrated and irradiated on a part of the housing 10 or the pipe 20. Therefore, it can prevent that the housing | casing 10 and a part of pipe 20 are heated intensively, and it can be set as the more excellent safety | security.

  As mentioned above, although the said embodiment was demonstrated to the example about this invention, this invention is not limited to this.

  For example, in the above embodiment, the housing 10 and the pipe 20 are made of metal. However, the present invention is not limited to this, and at least one of the housing 10 and the pipe 20 may be made of a material other than metal. In this case, as a material constituting the housing 10 and the pipe 20, for example, ceramic can be cited.

  For example, in the said embodiment, although the ferrule 30 shall exhibit light-scattering property, the ferrule 30 consists of glass which does not specifically have a bubble etc., for example, and does not need to exhibit light-scattering property.

  Moreover, in the said embodiment, the connection part CN of the optical fiber strand 40 and the optical fiber 50 is located in the part protruded in the space of the housing | casing 10 of the above-mentioned ferrule 30, Therefore The whole was located in the space of the housing 10. However, as long as the connection part CN between the optical fiber 40 and the optical fiber 50 is located in the through hole of the optical fiber holder, the location is not limited, and the connection part CN is in the through hole H2 of the pipe 20. May be located. For example, one end 36 of the ferrule 30 may protrude into the space of the housing 10 and a part of the optical fiber 40 may be located in the through hole H2 of the pipe 20 as in the above embodiment. One end portion 36 of 30 does not protrude into the space of the housing 10, and the entire optical fiber 40 may be located in the through hole H <b> 2 of the pipe 20. In this case, at least part of the light emitted from the optical fiber 40 is absorbed by the pipe 20 via the ferrule 30 and converted into heat. The generated heat is conducted from the pipe 20 to the housing 10 and absorbed by the cooling member from the housing 10 in the same manner as in the above embodiment. When one end portion 36 of the ferrule 30 does not protrude into the space of the housing 10 as described above and the entire optical fiber 40 is located in the through hole H2 of the pipe 20, the housing 10 can be reduced in size so that the ferrule 30 does not protrude.

  Moreover, in the said embodiment, although the pipe 20 was used as a frame, the frame was fixed to the housing | casing 10, and the through-hole by which the ferrule connected from the inner side of the housing | casing 10 to the outer side was inserted was formed. Any member may be used. For example, a plate-like member having a thickness larger than that of the side wall 13 of the housing 10 may be used. In this case, if the plate-like member is made of metal, the thermal conductivity is good, and if a part of the plate-like member is formed flush with the bottom surface of the bottom wall 12 of the housing 10, When the bottom wall 12 is connected to the cooling member, the plate-like member can be connected to the cooling member together with the bottom wall 12. Therefore, the optical fiber holder can be directly cooled. In this case, as described above, it is effective when at least part of the light emitted from the optical fiber 40 is absorbed by the pipe 20 and converted into heat.

  Moreover, in the said embodiment, the optical fiber strand 40 and the optical fiber 50 were hold | maintained at the pipe 20 by using the ferrule 30. FIG. However, the present invention is not limited to this, and the ferrule 30 may not be used. In this case, for example, the inner diameter of the pipe 20 may be equal to the inner diameter of the ferrule 30, and the optical fiber 40 may be fixed by means for fixing an optical fiber such as a fiber mount in the space of the housing 10. .

  In the above embodiment, the ferrule 30 is made of a light-transmitting material, but may be made of metal.

  Hereinafter, the content of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1
The core diameter is 105 μm, the numerical aperture is 0.15, the outer peripheral surface of the clad is coated with a coating layer made of resin, and the core diameter is 105 μm and the numerical aperture is 0.12. An optical fiber strand having a 1.5 mm long cladding exposed and a ferrule made of zirconia having a length of 10 mm were prepared. Next, the coating layer of the optical fiber was peeled 9.0 mm, and the end portion of the optical fiber was fused to the end portion on the side where the coating layer of the optical fiber was peeled. Then, the end of the optical fiber and the end of the ferrule are flush with each other, and the optical fiber and the portion where the optical fiber coating layer is peeled off are inserted into the through hole of the ferrule. Fixed. At this time, the coating layer of the optical fiber and the ferrule were fixed with an adhesive. Thereafter, the end of the optical fiber and the end of the ferrule were both polished, and an antireflection film was coated on the end of the polished optical fiber.

  In addition, a metal element having a metal pipe with a length of 8 mm is prepared in which a laser element is fixed, and the ferrule is placed in the space in the casing so that the optical fiber is disposed in the casing. The ferrule was inserted and fixed to the pipe by protruding 2 mm. At this time, alignment was performed so that light emitted from the laser element was incident on the optical fiber.

  Next, a portion 10 cm away from the optical fiber pipe was bent over a length of 30 cm so as to have a diameter of 6 cm. In this state, laser light was emitted from the laser element at a power of 10 W, and this laser light was incident on the core of the optical fiber. At this time, the highest temperature of the coating layer in the bent portion of the optical fiber was 33 degrees.

(Comparative Example 1)
The same optical fiber as in Example 1 was prepared, and the coating layer was peeled off by 10 mm. And the part from which the coating layer of the optical fiber was peeled was inserted and fixed to the same ferrule as Example 1. At this time, in the same manner as in Example 1, the coating layer of the optical fiber and the ferrule were fixed with an adhesive. Thereafter, the end portion of the optical fiber and the end portion of the ferrule were polished together, and the end portion of the polished optical fiber was coated with an antireflection film.

  Next, the same one as in Example 1 with a fixed laser element was prepared in a casing, and the ferrule was inserted into the pipe and fixed with the ferrule protruding 2 mm into the space in the casing. . At this time, alignment was performed so that light emitted from the laser element was incident on the core of the optical fiber.

  Next, in the same manner as in Example 1, with the optical fiber bent, laser light having the same power as in Example 1 was emitted from the laser element, and this laser light was incident on the core of the optical fiber. At this time, the highest temperature of the coating layer in the bent portion of the optical fiber was 80 degrees.

  As mentioned above, according to Example 1 which is the structure of this invention, it was confirmed that it can suppress that the temperature of a coating layer rises. Therefore, according to the present invention, it has been confirmed that even when a high intensity light is emitted, it has excellent safety.

  As described above, according to the present invention, an optical module having excellent safety can be provided even in the case of emitting light with high intensity, and can be used for an excitation light source of a fiber laser device, a laser processing device, or the like. Can be used.

DESCRIPTION OF SYMBOLS 1 ... Optical module 10 ... Housing 11 ... Top wall 12 ... Bottom wall 13 ... Side wall 20 ... Pipe (frame body)
DESCRIPTION OF SYMBOLS 30 ... Ferrule 40 ... Optical fiber strand 41 ... Core 42 ... Cladding 50 ... Optical fiber 51 ... Core 52 ... Cladding 53 ... Covering layer 61 ... Laser Mount 62 ... Laser element 63 ... Fixed resin CN ... Connection part H2, H3 ... Through hole

Claims (8)

A housing,
An optical fiber holder fixed to the housing and having a through hole communicating from the inside to the outside of the housing;
A laser element disposed in the housing and emitting laser light;
An optical fiber having a core, and light emitted from the laser element is incident on the core;
An optical fiber having a core, connected to the optical fiber, and partially inserted into the through hole;
With
The numerical aperture of the core of the optical fiber is smaller than the numerical aperture of the core of the optical fiber,
The connection portion between the optical fiber and the optical fiber is located in the through hole of the optical fiber holder,
In the connecting portion, the optical fiber and the optical fiber are fused to each other ,
The optical module, wherein the optical fiber is a multimode fiber . The optical module according to claim 1, wherein each of the optical fiber and the optical fiber is made of quartz. The optical fiber holder includes a frame body that is fixed to the housing and has a through hole that communicates with the housing, and a ferrule that is inserted into the through hole of the frame body.
3. The optical module according to claim 1, wherein the through hole of the optical fiber holder in which a connection portion between the optical fiber and the optical fiber is located is formed in the ferrule. The housing and the frame are made of metal.
The optical module according to claim 3, wherein the ferrule is made of a light transmissive material. The optical module according to claim 4, wherein the light transmissive material exhibits light scattering properties. One end of the ferrule protrudes into the space in the housing,
The optical module according to claim 4, wherein the connection portion is located at a portion of the ferrule that protrudes into the housing.   The optical module according to claim 4, wherein the connection portion is located in the through hole of the frame body. The optical module according to claim 3, wherein the ferrule is made of metal.

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