JP2014102498A - Wavelength multiplexed transmitter optical module and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wavelength multiplexed transmitter optical module capable of multiplexing wavelengths and transmitting signal light exiting from a plurality of light sources in high optical coupling efficiency, in which a lens corresponding to each light source can be accurately fixed at a desired position.SOLUTION: The wavelength multiplexed transmitter optical module multiplexes wavelengths and transmits signal light from a plurality of light sources mounted on a mounting board 14 via optical components including a plurality of optical lenses fixed with a resin at positions corresponding to the respective light sources on the mounting board 14. The mounting board 14 includes grid-like grooves 14e in a periphery of at least a mounting part of the plurality of optical lenses; and each optical lens is fixed with a resin in an area segmented by the grid-like grooves 14e.

Description

  The present invention relates to a wavelength division multiplexing optical transmission module for transmitting wavelength multiplexed signal light and a method for manufacturing the same.

The wavelength multiplexing optical transmission module transmits signal light emitted from a plurality of light sources by wavelength multiplexing using optical system components such as an optical lens, a wavelength selection filter, and a reflection mirror. The component is resin-fixed on the mounting board.
Patent Document 1 discloses a wavelength division multiplexing optical transmission module in which light sources and optical lenses are arrayed.

JP 2011-663339 A

When an array lens is used as in the wavelength division multiplexing optical transmission module of Patent Document 1, the position of each lens portion of the array lens with respect to the light source cannot be accurately determined, so that high optical coupling efficiency cannot be obtained.
On the other hand, when each lens is a separate body instead of the array lens, there are the following problems. That is, in the wavelength division multiplexing optical transmission module, a plurality of light sources are mounted so as to be in one row, and in accordance with this, the lenses for each light source are fixed in resin so that they are also in one row. Since the module package is small and the distance between the lenses is short, the resin fixing adhesive used for each lens interferes with each other, and the lens cannot be fixed at a desired position with high accuracy.

  The present invention has been made in view of the above circumstances, and can multiplex signal light emitted from a plurality of light sources and transmit them with high optical coupling efficiency. It is an object of the present invention to provide a wavelength division multiplexing optical transmission module that can be fixed at a desired position and a manufacturing method thereof.

  The wavelength division multiplexing transmission module of the present invention includes an optical component including a plurality of optical lenses for fixing signal light from a plurality of light sources mounted on a mounting substrate to positions corresponding to the plurality of light sources on the mounting substrate, respectively. The mounting substrate has at least a lattice-shaped groove around the mounting portion of the plurality of optical lenses, and each of the plurality of optical lenses is partitioned by the lattice-shaped grooves. It is characterized in that the resin is fixed in the region.

  In addition, it is preferable that the area in the area defined by the grooves is substantially equal to or larger than the adherend area of the plurality of optical lenses. The wall surface on the open end side of the groove is preferably perpendicular to the mounting surface. As the resin adhesive for fixing the optical lens with resin, an ultraviolet curable resin adhesive having a thixo value of 1.0 or more can be used.

  The method for manufacturing a wavelength division multiplex transmission module according to the present invention also includes a plurality of optical units in which signal light from a plurality of light sources mounted on a mounting substrate is resin-fixed at positions corresponding to the plurality of light sources on the mounting substrate. A method for manufacturing a wavelength division multiplexing optical transmission module that performs wavelength division multiplexing with an optical component including a lens and transmits the same, and is in an area defined by a grid-like groove formed in a mounting portion of the plurality of optical lenses on a mounting substrate Applying a resin adhesive to the resin adhesive, and aligning the plurality of optical lenses on the resin adhesive and fixing the resin.

  Since the wavelength division multiplexing transmission module of the present invention is not an array lens but separate lenses, and can be individually positioned, wavelength multiplexed signal light can be transmitted with high optical coupling efficiency. Also, among the optical system components including the lens, since the groove is provided at least around the lens mounting region, the resin adhesive for fixing each lens does not interfere with each other, and each lens is highly accurately It can be fixed at a desired location.

It is the figure which showed typically an example of the wavelength division multiplexing optical transmission module of this invention. It is the figure which showed the mounting substrate of the wavelength division multiplexing optical transmission module of FIG. FIG. 3 is a partial enlarged cross-sectional view of an optical lens mounting region of the mounting substrate of FIG. 2. It is the figure which showed typically the other example of the wavelength division multiplexing optical transmission module of this invention. It is the figure which showed typically the other example of the wavelength division multiplexing optical transmission module of this invention. It is the figure which showed the mounting substrate of the wavelength division multiplexing optical transmission module of FIG. It is a figure explaining the effect of the wavelength division multiplexing optical transmission module of FIG. It is a figure explaining the effect of the wavelength division multiplexing optical transmission module of FIG.

FIG. 1 is a diagram schematically showing an example of a wavelength division multiplexing optical transmission module of the present invention.
The wavelength division multiplexing optical transmission module 1 shown in the figure includes a main body 2 that wavelength-multiplexes and transmits signal light, and a sleeve component 3 that guides the wavelength-multiplexed signal light to an optical transmission line.
The main body 2 has a housing 6 composed of a package 4 and a lid 5. Although illustration is omitted, an opening is provided in front of the package 4 (on the sleeve part 3 side), and a sealing glass is provided in the opening, which serves as a window for signal light.

The main body 2 includes a plurality of light sources 7 a to 7 d that emit signal light and various optical system components in the housing 6. Here, the optical system components include a plurality of optical lenses 8a to 8d, polarization rotation components 9a and 9b, wavelength selection filters 10a and 10b, polarization selection filter 11, and reflection mirrors 12a to 12c.
The main body 2 includes a light source driving component 13 for driving a plurality of light sources 7a to 7d and a mounting substrate 14 on which the plurality of light sources 7a to 7d and various optical system components are fixed with resin. And having.

  The plurality of light sources 7a to 7d are arranged in a line and generate light having different wavelengths, for example, generate light having wavelengths λ1, λ2, λ3, and λ4, respectively. As the wavelengths λ1, λ2, λ3, and λ4, the oscillation wavelengths according to the LAN-WDM standard are selected. For example, the center wavelengths are 129.56 nm, 130.56 nm, 130.05 nm, 1304.58 nm, and 1309.14 nm, respectively. is there.

The optical lenses 8a to 8d are provided at corresponding positions of the light sources 7a to 7d, and convert light from the corresponding light sources 8a to 8d into collimated light.
The polarization rotation components 9a and 9b are provided in front of the first and third light sources 7a and 7c from the shorter wavelength, and provide output light obtained by rotating the polarization plane of incident light by 90 degrees.

The wavelength selection filter 10a is provided in front of the polarization rotation component 9a, and its optical characteristic selectively transmits light having a wavelength λ1 and reflects light having a wavelength λ3.
The wavelength selection filter 10b is provided in front of the optical lens 8b, and selectively transmits light having the wavelength λ2 and reflects light having the wavelength λ4.

  The polarization selection filter 11 is provided in front of the wavelength selection filter 10a, and its optical characteristics are polarized light after emission from the polarization rotation component 9a at the wavelength λ1 and emission from the polarization rotation component 9b at the polarization λ3. And the light having a polarization plane with an angle (for example, 90 degrees) different from that of the above polarized light at the wavelength λ2 or λ3.

  The reflection mirror 12a is provided in front of the wavelength selection filter 10a, and has an optical characteristic that reflects light having a wavelength λ2. The reflection mirror 12b is provided in front of the polarization rotation component 9b, and reflects the light having an optical characteristic of wavelength λ3. The reflection mirror 12c is provided in front of the optical lens 8d, and reflects the light whose wavelength is λ4.

  In the wavelength division multiplexing optical transmission module 1, the signal light emitted from the plurality of light sources 7 a to 7 d in the main body 2 is wavelength-multiplexed by the optical system components such as the optical lenses 8 a to 8 d described above, and provided in the housing of the main body 2. From the window. The emitted wavelength multiplexed signal light is collected by the optical lens 31, passes through the polarization-independent isolator 32, and is optically coupled to the optical fiber 33.

  The light driving component 13 for driving the light sources 7a to 7d is directly fixed to the package 4, whereas the mounting substrate 14 to which the light sources 7a to 7d are fixed with resin is a countermeasure against heat generated from the light sources 7a to 7d. Therefore, it is fixed to the package 4 via a heat dissipation component (not shown) made of a Peltier element or the like.

  The wavelength division multiplexing optical transmission module 1 having the above-described configuration is characterized by the structure of the mounting substrate 14 for fixing the optical lenses 8a to 8d with resin, and the characteristics will be described below with reference to FIGS. explain. FIG. 2 shows only the mounting substrate 14 of the wavelength division multiplexing optical transmission module of FIG. 3A and 3B are partially enlarged cross-sectional views of the optical lens mounting region of the mounting substrate 14, FIG. 3A showing the front and rear direction, and FIG. 3B showing the left and right direction.

  As shown in FIG. 2, on the mounting surface 14a of the mounting substrate 14, for example, a positioning mark 14b for positioning the light sources 7a to 7d, a positioning mark 14c for positioning the wavelength selection filters 10a and 10b, and polarization selection A positioning mark 14d for positioning the filter 11 is formed. In addition, on the mounting surface 14a, lattice-like grooves 14e are formed in the mounting portions of the optical lenses 8a to 8d. In other words, at least the grooves 14e around the mounting regions of the optical lenses 8a to 8d. Is formed.

  Since the groove 14e is formed in this way, when the optical lens is fixed with resin, the portion of the resin adhesive protruding from the optical lens forms a fillet in the vicinity of the groove 14e. It does not extend in the direction of the adjacent optical lens, and the resin adhesive of each optical lens does not interfere with each other.

  As described above, by providing the groove 14e, the resin adhesive applied to the optical lens mounting region forms a fillet in the vicinity of the groove 14e, in other words, the fixed end due to the surface tension of the resin adhesive is It is formed at the boundary with the groove 14e in the mounting area. Since the groove 14e having such an action is formed so as to surround the entire periphery of the mounting region, when a predetermined amount of resin adhesive is applied to the mounting region, the resin adhesive surface of the optical lens is constant. The resin adhesive adheres with the thickness. Therefore, a constant adhesive force can be obtained between the optical lens and the mounting substrate, and when the resin adhesive is cured, the resin adhesive does not generate uneven stress and is highly accurate (from a predetermined position). The optical lens can be fixed (within 1 μm).

The groove 14e as described above is such that the mounting area of each of the optical lenses 8a to 8d on the mounting substrate 14 delimited by the groove 14e is substantially equal to or larger than the non-bonding area of the optical lenses 8a to 8d. Is formed. More specifically, for example, as shown in FIG. 3A, the horizontal width Wr1 between adjacent grooves 14e is 1.1 to 1.5 times the horizontal width Wrk1 of the optical lens 8a. As shown in FIG. 3B, the front-rear width Wr2 between the adjacent grooves 14e is 1.1 to 1.5 times the front-rear width Wrk2 of the optical lens 8a. The groove 14e is formed in the mounting substrate 14. By making the optical lens mounting area delimited by the groove 14e large as described above, it is possible to prevent incomplete fillet formation and insufficient adhesion of the optical lens to the mounting substrate 14.
The width Wm of the groove 14e is preferably 25 to 100 μm and the depth Dx is 20 μm or more when the optical lens has a width of 1.1 mm and a thickness of 0.6 mm.

  In general, when a narrow groove is formed, the groove shape tends to have a V-shaped cross section. However, the shape of the groove 14a is not a V-shaped cross section (30 ° to 60 °), but is finely processed so that the side wall surface on the opening end side of the groove is substantially perpendicular to the mounting surface (70 ° to 90 °). Has been. By adopting such a shape, the fixed end due to the surface tension of the resin adhesive applied to the optical lens mounting area is surely formed at the boundary (edge) with the groove. It is possible to more reliably prevent adverse effects on the lens.

  As the base material of the mounting substrate 14, an aluminum nitride substrate, a silicon (Si) substrate, a quartz (SiO2) substrate, an iron nickel cobalt alloy substrate, or a substrate obtained by performing gold plating on the alloy substrate can be used.

  As the resin adhesive, a thixotropic adhesive is used in order to generate the above surface tension. Specifically, it is preferable to use an adhesive having a thixo value greater than 1.0 obtained from a ratio of 50 Rpm and 5 Rpm with a rotational viscometer. As such an adhesive, a resin adhesive containing a certain amount of fine particles of 10 to 50 μm formed from one or more of calcium carbonate, quartz, alumina and the like can be considered. Further, from the viewpoint of high-precision resin fixation, an ultraviolet curable epoxy resin adhesive having a small curing shrinkage rate during ultraviolet curing or the like is preferable.

Next, a method for creating the wavelength division multiplexing optical transmission module 1 of the present invention shown in FIG. 1 will be described with reference to FIGS.
First, the light sources 7a to 7d are placed on the positioning mark 14b on the mounting substrate 14 and fixed with solder or the like. Then, a predetermined amount of resin adhesive is applied to an area corresponding to the light source 4a among the areas delimited by the grooves 14e of the mounting substrate 14. Thereafter, in a state where a probe or the like is brought into contact with the light source 7a and a weak current is passed, the optical lens 8a is gripped by using an alignment equipment, and the position of the optical lens 8a is adjusted on the resin adhesive. At this time, the light emitted from the optical lens 8a is monitored by a general-purpose beam profiler, and the optical lens is adjusted to a position where desired parallel light is obtained as the emitted light. After the position adjustment, a predetermined amount of ultraviolet light is irradiated to temporarily fix the optical lens 8a. The same operation is repeated for the optical lenses 8b to 8d.

Next, the polarization rotation components 9a and 9c are temporarily fixed in front of the light sources 7a and 7c. This temporary fixing is performed using an ultraviolet curable resin adhesive or a thermosetting resin adhesive based on a positioning mark (not shown) on the mounting substrate 14.
Similarly, the wavelength selection filters 10 a and 10 b and the polarization selection filter are temporarily fixed using a resin adhesive based on the positioning marks 14 c and 14 d on the mounting substrate 14.

  Then, as described above, the mounting substrate 14 on which the light sources 7 a to 7 d and the optical lenses 8 a to 8 d are temporarily fixed is fixed to the package 4. This fixing is performed at a position where the light receiving sensitivity of the monitor device attached to the opening with the sealing glass provided in front of the package 4 is maximized. Note that the monitor device is a device including a single mode fiber with a collimating lens fixed to another stage. The light source driving component 13 is fixed to the package 4 with solder or the like in advance, and after the mounting substrate 14 is fixed, wiring between the light sources 7a to 7d and the light source driving component 13 is performed and electrically connected.

Next, the reflecting mirrors 12a to 12c are temporarily fixed. This temporary fixing is performed by using a resin adhesive at each of the reflection mirrors 12a to 12c at an angle and a position where the light receiving sensitivity by the above-described monitor device is maximized.
After all the above-described temporary fixing is completed, each part is permanently fixed using heat.
Thereafter, the lid 5 is welded to the package 4 in a nitrogen atmosphere, and the light sources 7a to 7d and each optical system component are hermetically sealed.

Finally, the sleeve part 3 is aligned and fixed to the package 4 by YAG welding. The alignment of the sleeve component 3 is performed by causing the light source 7a to emit light and adjusting the position of the sleeve component 3 to a position where the maximum amount of light received by the optical fiber 34 of the sleeve component 3 is obtained.
The wavelength multiplexing transmission module 1 is completed through the above steps.

  The above-described manufacturing procedure is an example, and after mounting optical system components other than the reflection mirrors 12a to 12c on the mounting substrate, the light source is aligned while checking the beam shape with a general-purpose beam profiler. Good.

  In the above example, among the optical system components, only the optical lenses 8a to 8d are formed with the groove 14e so as to surround the mounting region, but other optical system components such as the reflection mirrors 12a to 12c are also A groove may be formed around the mounting area.

FIG. 4 is a diagram schematically showing another example of the wavelength division multiplexing optical transmission module of the present invention. In addition, about the structure similar to the wavelength division multiplexing optical transmission module 1 of FIG. 1, the description is abbreviate | omitted by attaching | subjecting the same referential mark.
In the wavelength division multiplexing optical transmission module 1 of FIG. 1, an optical system is formed using the polarization rotation components 9a and 9b, the wavelength selection filters 10a and 10b, the polarization selection filter 11, and the like, and the lights from λ1 to λ4 are multiplexed. On the other hand, the wavelength division multiplexing optical transmission module 1 ′ shown in FIG. 4 collects four lights on the condenser lens 31 of the sleeve part 3 using a PLC (planar optical waveguide) 15.

  Even when the wavelength division multiplexing optical transmission module 1 ′ is manufactured, in order to extract the light from λ1 to λ4 as collimated light (parallel light), until the optical lenses 8a to 8d are fixed in front of the light sources of the respective wavelengths. The same method as that in the wavelength division multiplexing module 1 of FIG. 1 can be adopted. After fixing the optical lens, the PLC 15 is fixed to a predetermined substrate inside the package with solder or silver paste. In addition, as a fixing method of PLC15, for example, after performing alignment using a predetermined facility so that the optical coupling efficiency with respect to the optical fiber becomes the highest, a method of performing resin fixing using an ultraviolet thermosetting adhesive is used. By adopting it, it is possible to produce a wavelength division multiplexing optical transmission module with a small optical coupling loss.

  FIG. 5 is a diagram schematically showing another example of the wavelength division multiplexing optical transmission module of the present invention, and FIG. 6 is a diagram showing a mounting substrate of the wavelength division multiplexing optical transmission module of FIG. 7 and 8 are diagrams for explaining the effect of the wavelength division multiplexing optical transmission module of FIG. 7A, FIG. 7C, FIG. 7E, FIG. 8A, FIG. 8C, and FIG. 8E are top views of the mounting portion of the optical lens 8a, FIG. B), FIG. 7D, FIG. 7F, FIG. 8B, FIG. 8D, and FIG. 8F are cross-sectional views of the mounting portion. In addition, about the structure similar to the wavelength division multiplexing optical transmission module 1 of FIG. 1, the description is abbreviate | omitted by attaching | subjecting the same referential mark.

  In the wavelength division multiplexing optical transmission module 1 of FIG. 1, the grooves 14e are formed in a lattice shape, and the grooves 14e surround all four sides of the optical lenses 8a to 8d. On the other hand, in the wavelength division multiplexing optical module 1 ″ of this example, as shown in FIGS. 5 and 6, grooves 14e ″ are formed in a comb shape on the mounting substrate 14 ″, and the grooves 14e are formed in the optical lenses 8a to 8d, respectively. 3 sides are surrounded by 4 sides.

  In the wavelength multiplexing optical transmission module 1 of FIG. 1, when the optical lens 8 a is mounted (the same applies to the optical lenses 8 b to 8 d), first, as shown in FIGS. The fixing resin adhesive 16 is applied to the mounting region of the optical lens 8a surrounded by the groove 14e. Next, the lens position is adjusted. At this time, when the height of the light source is as designed, the center position of the optical lens 8a ideally matches the light source, that is, the light emission position of the laser after lens adjustment. There is no problem as shown in D). However, when the height of the light source is lowered due to variations in component dimensions, etc., as shown in FIGS. 7E and 7F, excess resin adhesive 16 is pushed out and dammed in the groove 14, and the optical The resin adhesive 16 may swell around the lens 8a, and the lens surface 81 of the optical lens 8a may be covered. In this case, if the resin adhesive 16 reaches the effective diameter of the optical lens, it causes light loss, and the required light output cannot be obtained.

  On the other hand, in the wavelength multiplexing optical transmission module 1 ″ of FIG. 5, when the optical lens 8a is mounted (the same applies to the optical lenses 8b to 8d), as shown in FIG. 8 (A) and FIG. 8 (B), Similarly, a fixing resin adhesive 16 is first applied to the mounting region of the optical lens 8a surrounded by the groove 14e ″ on the mounting substrate 14 ″. Next, as shown in FIGS. 8C and 8D. When the optical lens 8a is placed on the resin adhesive 16, a part of the resin adhesive is pushed out in a direction in which the groove 14e "is not formed. Even when the height of the light source is lowered due to component size variation or the like, the resin adhesive 16 between the optical lens 8a and the mounting substrate 14 is pushed out in the direction in which the groove 14e ″ is not formed. The adhesive 14 "does not cover the lens surface 81 of the optical lens 8a. As described above, in the wavelength division multiplexing optical transmission module 1 ″, it is possible to suppress the adhesion of the excessive resin adhesive 16 to the lens surface 81 while ensuring the thickness of the resin adhesive 16.

  When surrounding three sides among the four sides of each of the optical lenses 8a to 8d like the groove 14e ", the groove 14e" is at least between the optical lenses 8a to 8d and closest to the optical lenses 8a to 8d. In the example shown in the figure, it is preferably provided between the polarization rotation components 9a and 9b and the optical lenses 8a to 8d.

Next, a method for mounting the optical lens 8a in the wavelength division multiplexing optical transmission module 1 ″ of FIG. 5 will be described. The optical lens 8a has a width Wk1 (see FIG. 3) in the left-right direction of 0.6 mm and a front-rear direction. Assume that the width Wk2 is 0.55 mm and the height is 1.0 mm.
At the time of fixing, first, a fixed amount of resin adhesive 16 is attached to the inside of the three surrounding grooves 14e ″ using a dispenser. At this time, the resin adhesive 16 flows to the periphery due to the surface tension of the ends of the grooves 14e ″. Without retaining the thickness of the resin adhesive 16 (about 100 μm).

  Aiming at the center of the resin adhesive 16, the optical lens 8a sucked and held by the collet is lowered from above, and the position of the lens is aligned so as to maximize the fiber light output. Ideally, the center position of the optical lens 8a coincides with the light emission position of the light source, that is, the laser. The thickness of the resin adhesive 16 after alignment is 50 μm + 30 μm so that the alignment of the optical lens 8a can be performed without interference with the mounting surface even if the laser height variation (± 30 μm in this example) occurs. It is adjusted so that.

Also, the amount of the resin adhesive 16 is adjusted so that it adheres to the entire bottom surface of the optical lens 8a even when the laser position is increased by 30 μm at the maximum and as a result the distance between the optical lens 8a and the mounting surface is 80 μm. ing. Further, even when the height of the laser is reduced by 30 μm at the maximum and the thickness of the resin adhesive 16 is 20 μm, the groove 14e ″ is not formed on one side around the mounting surface of the optical lens 8a. Since excess resin adhesive 16 flows in this region, the resin adhesive 16 crawls up to the curved surface of the optical lens 8a due to surface tension and blocks the effective diameter, and the resin adhesive 16 protrudes beyond the groove 14e ". It is possible to avoid adversely affecting the fixing of the lens resin adhesive in the adjacent lane.
The same applies to the other optical lenses 8b to 8d.

The dimensions of the groove 14e ″ are, for example, a depth of 80 μm ± 50 μm and a width of 80 μm ± 50 μm. The dimensions from the grooves 14e ″ on both sides of the optical lenses 8b to 8d to the groove 14e ″, that is, the dimensions of the lens mounting region are 0.00. More specifically, for example, the pitch of the laser as a light source is 075 mm, the width of the groove 14e ″ is 80 μm, and the width of the lens mounting area is 0.67 mm.
The length of the groove 14e ″ on both sides of the lens is 1 mm or more, and the distance from one lens surface of the optical lens is 0.25 mm or more.

  Any of the mounting substrates in the above examples can be formed using ceramics such as AlN and alumina, and the groove can be formed by sandblasting the mounting surface.

  In the above example, the groove is formed so as to surround the mounting area of only the optical lens among the optical system parts, but the groove is also formed around the mounting area for other optical system parts such as a reflection mirror. You may make it form. However, for parts that do not require height alignment, such as an optical lens, the thickness of the adhesive is not required, so the groove is used only to prevent the adhesive from flowing in.

DESCRIPTION OF SYMBOLS 1 ... Wavelength multiplexing optical transmission module, 2 ... Main part, 3 ... Sleeve part, 4 ... Package, 5 ... Cover, 6 ... Housing, 7a-7d ... Light source, 8a-8d ... Optical lens, 9a, 9b ... Polarization rotation Components: 10a, 10b ... Wavelength selection filter, 11 ... Polarization selection filter, 12a-12c ... Reflection mirror, 13 ... Light source driving component, 14 ... Mounting substrate, 14e ... Groove, 15 ... Planar optical waveguide.

Claims (7)

Signal light from a plurality of light sources mounted on a mounting board is wavelength-multiplexed by an optical component including a plurality of optical lenses fixed to a position corresponding to each of the plurality of light sources on the mounting board and transmitted. In a wavelength division multiplexing optical transmission module,
The mounting substrate has at least a lattice-shaped groove on a mounting portion of the plurality of optical lenses,
Each of the plurality of optical lenses is resin-fixed in an area partitioned by the lattice-shaped grooves.   2. The wavelength division multiplexing optical transmission module according to claim 1, wherein an area in a region defined by the grooves is substantially equal to or larger than an adherend area of the plurality of optical lenses.   3. The wavelength division multiplexing optical transmission module according to claim 1, wherein a wall surface on the open end side of the groove is perpendicular to the mounting surface.   4. The wavelength according to claim 1, wherein the resin adhesive for fixing the optical lens with resin is an ultraviolet curable resin adhesive having a thixo value of 1.0 or more. Multiplex optical transmission module.   The wavelength division multiplexing optical transmission module according to any one of claims 1 to 4, wherein the groove is formed in a comb shape. Signal light from a plurality of light sources mounted on a mounting board is wavelength-multiplexed by an optical component including a plurality of optical lenses fixed to a position corresponding to each of the plurality of light sources on the mounting board and transmitted. In the manufacturing method of the wavelength division multiplexing optical transmission module,
Applying a resin adhesive in a region defined by grid-like grooves formed in a mounting portion of the plurality of optical lenses of the mounting substrate;
Positioning the plurality of optical lenses on the resin adhesive and fixing them with resin. Before the resin fixing step, including mounting a component other than the optical lens constituting the optical system on the mounting substrate with reference to a mark provided on the mounting substrate;
The method for manufacturing a wavelength division multiplexing optical transmission module according to claim 6, further comprising the step of optically aligning the plurality of light sources with respect to the optical system after the resin fixing step.

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