WO2022091222A1 - 光モジュールおよび光モジュールの製造方法 - Google Patents

光モジュールおよび光モジュールの製造方法 Download PDF

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Publication number
WO2022091222A1
WO2022091222A1 PCT/JP2020/040273 JP2020040273W WO2022091222A1 WO 2022091222 A1 WO2022091222 A1 WO 2022091222A1 JP 2020040273 W JP2020040273 W JP 2020040273W WO 2022091222 A1 WO2022091222 A1 WO 2022091222A1
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WO
WIPO (PCT)
Prior art keywords
optical
lens
receptacle
element mounting
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/040273
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English (en)
French (fr)
Japanese (ja)
Inventor
進一 金子
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2020/040273 priority Critical patent/WO2022091222A1/ja
Priority to JP2021520237A priority patent/JPWO2022091222A1/ja
Publication of WO2022091222A1 publication Critical patent/WO2022091222A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements

Definitions

  • This disclosure relates to an optical module and a method for manufacturing an optical module.
  • Patent Document 1 discloses an optical transceiver including a housing made of a metal material and a receptacle portion fixed to the housing.
  • the housing accommodates a TOSA (Transmitter Optical SubAssembly), a ROSA (Receiver Optical SubAssembly), a transmitter circuit, a receiver circuit, an LD (Laser Diode) driver, and a post amplifier.
  • TOSA and ROSA is positioned in a plane orthogonal to the optical axis direction and the optical axis direction by sandwiching the receptacle in the receptacle mounting portion of the optical transceiver.
  • the position of the receptacle may be adjusted with reference to the position of the optical element mounting portion in order to obtain the optimum optical coupling.
  • the distance between the optical element mounting portion and the receptacle may change.
  • the position of the flange of the receptacle may shift.
  • it may be difficult to arrange the optical module in the optical transceiver.
  • a mirror may be used for inputting light from a light source to an optical transmitting unit or an optical receiving unit. At this time, the coupling efficiency may be significantly reduced due to the deviation of the mirror angle.
  • the light output may change due to a slight change in the angle of the mirror due to a change in the ambient temperature of the optical module. Further, when a plurality of mirrors are mounted on different substrates, the light output may change due to a slight change in the angle of the mirrors due to a change in the temperature of the substrate. Therefore, it may be difficult to adjust the angle of the mirror.
  • An object of the present disclosure is to obtain an optical module and a method for manufacturing an optical module, which facilitates the arrangement of an optical module in an optical transceiver or the arrangement of parts in an optical module.
  • the optical module according to the first disclosure connects a receptacle having an optical fiber, an optical element mounting portion having at least one of an optical transmitting unit or an optical receiving unit, the receptacle and the optical element mounting unit, and from the receptacle.
  • the lens is provided with a lens holder having a through hole formed up to the optical element mounting portion, a lens barrel housed in the through hole, and a lens housed in the through hole and held in the lens barrel.
  • the holder is directly bonded to the receptacle and the optical element mounting portion, and the inner surface of the lens holder forming the through hole can be bonded to the lens barrel at an arbitrary position in the direction along the optical axis of the lens. be.
  • the optical module according to the second disclosure is provided between a receptacle having an optical fiber, an optical element mounting portion having at least one of an optical transmitting unit or an optical receiving unit, and the receptacle and the optical element mounting unit.
  • the receptacle comprises a lens that collects the light from the optical transmitting unit onto the optical fiber or causes the light from the optical fiber to enter the optical receiving unit, and the receptacle is tubular and the optical fiber is formed. It has a main body portion to be stored and a flange attached to a side surface forming an outer edge of the main body portion and projecting outward from the side surface.
  • the optical module according to the third disclosure includes a first receptacle having a first optical fiber, a second receptacle having a second optical fiber, an optical transmitting unit, an optical receiving unit, and a light source.
  • a first lens provided between the optical element mounting portion, the first receptacle, and the optical element mounting portion, and condensing light from the light transmitting unit onto the first optical fiber, and the same.
  • a second lens provided between the second receptacle and the optical element mounting portion and allowing light from the second optical fiber to be incident on the optical receiving portion is provided, and the optical element mounting portion is provided.
  • It has a first substrate provided with the light transmitting unit, a second substrate provided with the light receiving unit, and a third substrate provided with the light source, and has a plurality of reflecting surfaces orthogonal to each other.
  • a first prism that reflects light from the light source on the plurality of reflecting surfaces and causes the light to be incident on the light transmitting unit, and a plurality of reflecting surfaces orthogonal to each other, and the plurality of reflecting surfaces from the light source.
  • a second prism that reflects light and causes it to enter the light receiving unit is provided, and the first prism is mounted on one of the first substrate and the third substrate, and the first prism is mounted on one of the first substrate and the third substrate.
  • the prism 2 is mounted on one of the second substrate and the third substrate.
  • a lens holder containing a lens is arranged between an optical element mounting portion having at least one of an optical transmitting unit or an optical receiving unit and a receptacle having an optical fiber. Then, the end face of the lens holder perpendicular to the optical axis of the lens and the end face of the receptacle perpendicular to the optical axis are parallel to each other, and the end face of the lens holder and the end face of the receptacle are parallel to each other. After adjusting the position of the lens in the lens holder in the direction along the optical axis, fixing the lens to the lens holder, fixing the lens to the lens holder, and then fixing the lens to the optical element mounting portion.
  • the lens barrel and the lens are housed in the lens holder. Therefore, the position of the lens can be adjusted in the lens holder. Therefore, by adjusting the position of the lens, the distance between the optical element mounting portion and the receptacle does not change, and it is possible to easily arrange the optical module in the optical transceiver.
  • a flange is attached to the side surface of the main body of the receptacle as a separate part. Therefore, the position of the flange can be set independently of the main body. Therefore, it is possible to easily arrange the optical module in the optical transceiver.
  • the process of highly accurate angle adjustment of the mirror can be reduced by the first prism having a plurality of reflecting surfaces and the second prism. Further, each of the first prism and the second prism is mounted on one substrate. Therefore, for each of the first prism and the second prism, it is possible to suppress the deviation of the angle due to the temperature change of the plurality of substrates. Therefore, it is possible to easily arrange the parts in the optical module.
  • the position in the lens holder in the direction along the optical axis of the lens is adjusted. Therefore, by adjusting the position of the lens, the distance between the optical element mounting portion and the receptacle does not change, and it is possible to easily arrange the optical module in the optical transceiver.
  • FIG. 2 is a cross-sectional view taken along the line AA of FIG.
  • FIG. 2 is a cross-sectional view taken along the line BB of FIG.
  • FIG. 11 is a cross-sectional view taken along the line CC of FIG. It is a figure which shows the relationship between the inclination of a prism and a mirror, and the coupling efficiency.
  • FIG. 1 is a side view of the lens holder which concerns on the modification of Embodiment 1.
  • FIG. 1 is sectional drawing of the lens holder which concerns on the modification of Embodiment 1.
  • FIG. It is a plan view and a front view of the prism which concerns on the 1st modification of Embodiment 1.
  • FIG. It is a figure explaining the structure of the prism which concerns on the 2nd modification of Embodiment 1.
  • FIG. It is a top view of the optical module which concerns on Embodiment 2.
  • FIG. It is a figure explaining the structure of the prism and the mirror which concerns on Embodiment 2.
  • FIG. It is a figure explaining the adjustment method of the incident light ray to a light receiving part.
  • optical module and the manufacturing method of the optical module according to each embodiment will be described with reference to the drawings.
  • the same or corresponding components may be designated by the same reference numerals and the description may be omitted.
  • FIG. 1 is a plan view of the optical module 100 according to the first embodiment.
  • a flexible substrate 11 is provided on one side of the optical element mounting portion 10, and lens holders 50, 60 and receptacles 55, 65 are provided on the other side.
  • the transmitting side may be described as an example for convenience, but the configuration of the optical system on the receiving side is the same as that on the transmitting side except that the traveling direction of the light is opposite.
  • the optical element mounting unit 10 includes an optical transmitting unit 30, an optical receiving unit 40, and a light source unit 20.
  • the optical transmission unit 30 is provided on the substrate 31.
  • the optical receiving unit 40 is provided on the substrate 41.
  • the light source unit 20 is provided on the substrate 21.
  • Lenses 32 and 33 are mounted on the substrate 31.
  • the lens 32 is a condensing lens that collects the light emitted from the light source unit 20 deflected by the prism 24 on the light transmitting unit 30.
  • the lens 33 is a collimating lens that converts an optical signal emitted from the optical transmission unit 30 into parallel light.
  • Lenses 42 and 43 are mounted on the substrate 41.
  • the lens 42 is a condensing lens that collects the light emitted from the light source unit 20 deflected by the prism 25 to the light receiving unit 40.
  • the lens 43 is a condensing lens for condensing an optical signal incident on the optical element mounting unit 10 on the light receiving unit 40.
  • the lenses 22 and 23 and the prisms 24 and 25 are mounted on the substrate 21.
  • the lenses 22 and 23 are collimated lenses that convert the light from the light source unit 20 into parallel light.
  • a wavelength monitor for monitoring the oscillation light wavelength may be attached to the light source unit 20.
  • the substrate 21 of the light source unit 20 may be composed of a plurality of substrates.
  • the prism 24 has a plurality of reflecting surfaces 24a and 24b orthogonal to each other.
  • the prism 24 reflects the light from the light source unit 20 on the plurality of reflecting surfaces 24a and 24b and causes the light to be incident on the light transmitting unit 30.
  • the prism 25 has a plurality of reflecting surfaces 25a and 25b orthogonal to each other. The prism 25 reflects the light from the light source unit 20 on the plurality of reflecting surfaces 25a and 25b and causes the light to be incident on the light receiving unit 40.
  • the receptacle 55 has an optical fiber 57.
  • the receptacle 55 has a main body portion 58 which is tubular and accommodates the optical fiber 57, and a flange 56 which protrudes outward from the side surface of the main body portion 58.
  • the receptacle 65 has an optical fiber 67.
  • the receptacle 65 has a main body portion 68 which is tubular and houses an optical fiber 67, and a flange 66 which protrudes outward from the side surface of the main body portion 68.
  • the lens holder 50 connects the receptacle 55 and the optical element mounting portion 10.
  • the lens holder 50 is formed with a through hole penetrating from the receptacle 55 to the optical element mounting portion 10.
  • the lens portion 51 is housed in the through hole of the lens holder 50.
  • the lens portion 51 has a lens barrel 51b and a lens 51a held by the lens barrel 51b.
  • the lens holder 60 connects the receptacle 65 and the optical element mounting portion 10.
  • the lens holder 60 is formed with a through hole penetrating from the receptacle 65 to the optical element mounting portion 10.
  • the lens portion 61 is housed in the through hole of the lens holder 60.
  • the lens unit 61 has a lens barrel 61b and a lens 61a held by the lens barrel 61b.
  • the lens holders 50 and 60 are, for example, cylindrical.
  • the end face 50a perpendicular to the optical axis of the lens 51a of the lens holder 50 and the end face 55a of the receptacle 55 perpendicular to the optical axis of the lens 51a are joined.
  • the end surface 60a of the lens holder 60 perpendicular to the optical axis of the lens 61a and the end surface 65a of the receptacle 65 perpendicular to the optical axis of the lens 61a are joined.
  • the optical axis of the lens 51a is parallel to the traveling direction of the light from the light transmitting unit 30 toward the receptacle 55 in FIG.
  • the optical axis of the lens 61a is parallel to the traveling direction of the light from the receptacle 65 toward the light receiving unit 40 in FIG.
  • the lens barrels 51b and 61b are, for example, tubular.
  • the lens barrel 51b is joined to the inner surface of the lens holder 50 that forms a through hole.
  • the lens barrel 61b is joined to the inner surface forming the through hole of the lens holder 60.
  • the digital coherent method has a high affinity with the quadrature amplitude modulation method (QAM: Quadrature Amplitude Modulation) that can add multi-valued information to the phase and amplitude of the optical signal, or the polarization multiplex transmission method using quadrature bipolarization. .. Therefore, the digital coherent method is promising as a method for realizing a large-capacity optical transmission system.
  • QAM Quadrature Amplitude Modulation
  • the emitted light from the same light source is used for transmission and reception. Therefore, two receptacles 55 and 65 are attached to the package of the optical module 100, one for transmission and the other for reception. Further, in FIG. 1, the electric signal is shown by a broken line and the optical signal is shown by a solid line.
  • the light source unit 20 is, for example, a tunable wavelength light source capable of adjusting the oscillation wavelength to a predetermined wavelength.
  • the optical transmission unit 30 has, for example, an optical modulator that modulates the incident light from the light source unit 20 according to an electric signal input to the optical module 100 via the flexible substrate 11.
  • the light modulator is, for example, a Machzenda modulator.
  • the transmitted light signal emitted from the optical transmission unit 30 is converted into parallel light by the lens 33, and is emitted from the optical element mounting unit 10 so as to be coupled to the optical fiber 57 of the receptacle 55.
  • the light emitted from the optical element mounting unit 10 is output to the outside from the receptacle 55.
  • the optical receiving unit 40 combines the incident light from the light source unit 20 and the received light signal from the receptacle 65, and coherently detects them with a photodiode.
  • the combined signal is converted into an electric signal and transmitted to the outside via the flexible substrate 11.
  • the characteristics of the light source unit 20 and the characteristics of the light modulator of the light transmission unit 30 depend on the temperature.
  • the temperature of the light source unit 20 needs to be changed according to the wavelength of the emitted light. Therefore, the light source unit 20 and the light transmission unit 30 are controlled so that their temperatures are constant.
  • the light source unit 20 and the light transmission unit 30 are mounted on independent substrates 21 and 31, and are controlled at different temperatures.
  • the receptacle 55 meshes with the optical connector of the transmission line and outputs the optical signal generated by the optical transmission unit 30 to the transmission line.
  • the receptacle 65 meshes with the optical connector of the transmission line, and inputs the optical signal propagating in the transmission line to the optical receiving unit 40.
  • the optical fibers 57 and 67 are short optical fibers that come into contact with the optical fiber of the optical connector of the transmission line.
  • Flange 56, 66 is provided to position and secure the receptacles 55, 65 to the optical transceiver.
  • the lens 51a is provided between the receptacle 55 and the optical element mounting unit 10, and collects the signal light from the optical transmission unit 30 on the optical fiber 57.
  • the lens 61a is provided between the receptacle 65 and the optical element mounting unit 10, converts the signal light from the optical fiber 67 into parallel light, and causes the light to be incident on the optical receiving unit 40.
  • the position of the lens unit 51 is adjusted in the optical axis direction in the lens holder 50 according to the convergence and divergence of the light emitted from the optical element mounting unit 10. Further, the position of the lens portion 51 is adjusted in the optical axis direction in the lens holder 50 according to the variation in the position of the incident surface of the optical fiber 57 due to the variation in the dimensions of the optical fiber 57. As a result, the optical signal can be collected on the optical fiber 57.
  • the position of the lens portion 61 is also adjusted in the optical axis direction in the lens holder 60 according to the variation in the fixed position of the lens 43 or the variation in the position of the exit surface of the optical fiber 67 due to the variation in the dimensions of the optical fiber 67.
  • the lens is also adjusted in the optical axis direction in the lens holder 60 according to the variation in the fixed position of the lens 43 or the variation in the position of the exit surface of the optical fiber 67 due to the variation in the dimensions of the optical fiber 67.
  • FIG. 2 is a cross-sectional view of the optical module 100 according to the first embodiment.
  • FIG. 3 is a sectional view taken along the line AA of FIG.
  • FIG. 4 is a cross-sectional view taken along the line BB of FIG.
  • the optical transceiver on which the optical module 100 is mounted includes a housing 12.
  • the optical module 100 holds the flanges 56 and 66 in the holding portion 14 of the housing 12, and is incorporated in the housing 12.
  • the optical module 100 is provided on the upper surface of the housing 12 via the heat dissipation sheet 13.
  • the heat radiating sheet 13 is provided in order to efficiently release the heat generated by the optical element mounting portion 10 to the housing 12.
  • the heat radiating sheet 13 is, for example, in the form of a gel.
  • the arrow 80 indicates the direction of the force applied to the optical element mounting portion 10 with a finger or the like in order to improve the thermal contact with the heat radiating sheet 13.
  • a laser welded portion 70 with the receptacle 55 is formed on the end surface 50a of the lens holder 50. Further, the lens holder 50 and the lens barrel 51b are joined by a laser welded portion 71. Further, a laser welded portion 72 by laser hammering, which will be described later, is formed between the lens holder 50 and the lens barrel 51b.
  • the transmitting side has been described, but the configuration of the joint portion on the receiving side is also the same.
  • FIG. 5 is a flowchart showing a manufacturing method of the optical module 100 according to the first embodiment. Next, the receptacle mounting process of the optical module 100 will be described. The mounting process on the transmitting side will be described below, but the same applies to the receiving side.
  • the receptacle mounting process includes the following first to fifth steps.
  • the lens holder 50 accommodating the lens portion 51 and the receptacle 55 are arranged with respect to the optical element mounting portion 10.
  • the joint surfaces of the lens holder 50 and the receptacle 55 are made parallel to each other and brought into close contact with each other.
  • the position of the lens portion 51 is adjusted so as to form an image on the optical fiber 57, and the lens portion 51 is fixed to the lens holder 50.
  • the positions of the optical element mounting portion 10 and the lens holder 50 are adjusted and fixed.
  • the receptacle 55 is centered and fixed to the lens holder 50.
  • the lens holder 50 in which the lens 51a is housed is arranged between the optical element mounting portion 10 and the receptacle 55.
  • the optical element mounting portion 10, the lens holder 50, and the receptacle 55 may be arranged apart from each other.
  • the end face 50a of the lens holder 50 and the end face 55a of the receptacle 55 are made parallel to each other. If the joint surfaces are slanted with each other, the positional relationship between the lens holder 50 and the receptacle 55 in the optical axis direction may deviate between when the position is adjusted and when the lens is assembled. Therefore, even if the centering is adjusted so that the coupling efficiency is maximized, the maximum coupling efficiency may not be obtained after assembly.
  • the receptacle 55 is first centered. Next, it is determined whether or not the coupling efficiency is equal to or higher than the specified value at the joint surface between the lens holder 50 and the receptacle 55. At this time, it may be determined whether or not the bonding efficiency is maximum on the bonding surface. If the coupling efficiency is not equal to or higher than the specified value or is not the maximum, the lens portion 51 is moved in the optical axis direction and the receptacle 55 is centered again. When the coupling efficiency is equal to or higher than the specified value or maximum, the lens portion 51 is fixed to the lens holder 50.
  • the position of the lens portion 51 in the lens holder 50 in the direction along the optical axis is adjusted to adjust the lens.
  • the portion 51 is fixed to the lens holder 50.
  • the lens portion 51 is fixed to the lens holder 50 by laser welding or the like.
  • FIG. 6 is a diagram illustrating a method of adjusting the position of the lens 51a.
  • the position of the lens 51a is adjusted by using, for example, a jig 90.
  • the jig 90 has a tubular magnet 90a for holding the lens barrel 51b by magnetic force, and a holding portion 90b for holding the magnet 90a.
  • the lens barrel 51b is attached to the magnet 90a, and the lens 51a is moved via the holding portion 90b.
  • the receptacle 55 may be centered by leaving a predetermined minute gap such as 5 to 10 um between the lens holder 50 and the receptacle 55.
  • a predetermined minute gap such as 5 to 10 um between the lens holder 50 and the receptacle 55.
  • the position of the lens 51a in the optical axis direction is fixed away from the receptacle 55 by a minute gap.
  • the joint surface between the optical element mounting portion 10 and the lens holder 50 is brought into close contact with each other to align the receptacle 55.
  • the coupling efficiency does not greatly depend on the distance between the lens holder 50 and the optical element mounting portion 10. For this reason, it is not always necessary to bring the lens holder 50 and the optical element mounting portion 10 into close contact with each other in parallel, but it is preferable that the joint surfaces be in parallel and in close contact with each other.
  • it is determined whether or not the coupling efficiency is equal to or higher than the specified value. At this time, it may be determined whether or not the coupling efficiency is maximum.
  • the lens holder 50 When the coupling efficiency is not equal to or higher than the specified value or is not the maximum, the lens holder 50 is moved and centered in the bonding surface with the optical element mounting portion 10. Next, the receptacle 55 is centered again. When the coupling efficiency is equal to or higher than the specified value or is maximum, the lens holder 50 is fixed to the optical element mounting portion 10 by laser welding or the like.
  • the position of the lens holder 50 in the direction perpendicular to the optical axis with respect to the optical element mounting portion 10 is adjusted, and the lens holder 50 is mounted on the optical element mounting portion. Fix it to 10.
  • the joint surface between the lens holder 50 and the receptacle 55 is made parallel.
  • the receptacle 55 is moved in the joint surface and centered so that the coupling efficiency becomes equal to or higher than the specified value or is maximized on the joint surface.
  • the receptacle 55 is fixed to the lens holder 50 by laser welding or the like.
  • the position of the receptacle 55 with respect to the lens holder 50 in the direction perpendicular to the optical axis is adjusted, and the receptacle 55 is fixed to the lens holder 50. ..
  • the end surface 50a perpendicular to the optical axis of the lens holder 50 and the end surface 55a perpendicular to the optical axis of the receptacle 55 are laser welded.
  • the lens holder 50 and the laser welded portion 70 of the receptacle 55 are provided at three points so as to be separated from each other by 120 °. That is, laser welding is performed so that the joint portion is symmetrical with respect to the optical axis. As a result, the contraction force is applied symmetrically with respect to the optical axis, and the mounting accuracy can be improved.
  • the optical fiber 57 may be displaced from the optimum position and the optical output may decrease.
  • the lens holder 50 after fixing the lens holder 50 between the optical element mounting portion 10 and the receptacle 55, the lens holder 50 and the lens portion 51 are further laser welded from the outside of the lens holder 50. As a result, the position of the lens portion 51 is corrected. In laser hammering, laser welding is performed from the opposite side in the direction of misalignment.
  • laser welding is performed on the starting point side of the arrow 81a indicating the axis deviation to form the laser welded portion 72.
  • the lens portion 51 is pulled and displaced in the direction of the arrow 81b.
  • the axis deviation is corrected and the optical output can be improved.
  • Laser hammering is performed under the same conditions as laser welding for fixing the lens portion 51 and the lens holder 50. Further, when the correction amount of the axis deviation is small, laser hammering may be performed under conditions weaker than the laser welding conditions for fixing the lens portion 51 and the lens holder 50.
  • the condition of laser welding is, for example, the output of a laser.
  • FIG. 7 is a plan view of the prism 24 according to the first embodiment.
  • FIG. 8 is a front view of the prism 24 according to the first embodiment.
  • the displacement of the emitted light beam by the prism 24 will be described, but the same applies to the prism 25.
  • the incident light ray 82a on the prism 24 is reflected by the reflecting surfaces 24a and 24b orthogonal to each other, and is emitted as an emitted light ray 82b.
  • the prism 24 is displaced in the direction of the arrow 82c as shown in FIG.
  • the position of the prism 24 after displacement is indicated by the broken line 82d.
  • the emitted light ray 82b moves in the direction of the arrow 82f, and the emitted light ray 82e is obtained.
  • the prism 24 is displaced in the direction of the arrow 82g as shown in FIG.
  • the position of the prism 24 after the displacement is indicated by the broken line 82h.
  • the emitted light ray 82b moves in the direction of the arrow 82j, and the emitted light ray 82i is obtained.
  • FIG. 9 is a plan view of the optical module 101 according to the first comparative example.
  • the lens portions 51 and 61 are directly attached to the optical element mounting portion 110.
  • Receptacle holders 153 and 163 are provided at the ends of the lens portions 51 and 61 on the opposite side of the optical element mounting portion 110.
  • Receptacles 55 and 65 slide inside the receptacle holders 153 and 163. This makes it possible to adjust the positions of the receptacles 55 and 65 in the optical axis direction.
  • the optical element mounting portion 110 includes mirrors 126a to 126d instead of the prisms 24 and 25.
  • the light emitted from the light source unit 20 is deflected to the light transmission unit 30 by the mirrors 126c and 126d. Further, the emitted light of the light source unit 20 is deflected to the light receiving unit 40 by the mirrors 126b and 126a.
  • FIG. 10 is a plan view of the optical transceiver 180 according to the second comparative example.
  • the optical transceiver 180 includes a transmission light module 101a, a reception light module 101b, a transmission light module 101a, a substrate 115 for controlling the reception light module 101b, and a housing 12 containing these.
  • the transmission optical module 101a includes a flexible substrate 111a for connecting an optical element mounting portion 110a, an optical element mounting portion 110a, and a substrate 115, a receptacle 55, and a lens portion 51 provided between the receptacle 55 and the optical element mounting portion 110a. Be prepared.
  • the received optical module 101b includes an optical element mounting portion 110b, a flexible substrate 111b for connecting the optical element mounting portion 110b and the substrate 115, a receptacle 65, and a lens portion 61 provided between the receptacle 65 and the optical element mounting portion 110b.
  • a duplex type optical connector in which a transmission optical connector and a reception optical connector are integrated is used for input / output of an optical signal to the optical transceiver 180.
  • the relative positions of the optical connector for transmission and the optical connector for reception are generally fixed. Therefore, the portion of the housing 12 for fixing the receptacles 55 and 56 is formed according to the dimensions of the duplex type optical connector.
  • the optical module 101 and the optical transceiver 180 when the receptacles 55 and 65 are slid as shown in FIG. 9, the distance between the optical element mounting portion and the receptacle changes. At this time, depending on the configuration of the optical module 101 and the optical transceiver 180, it may be difficult to arrange the components.
  • the optical transmission unit 30 and the optical reception unit 40 are housed in the same package. In this configuration, if the flanges 56 and 66 are misaligned, they may not be mounted on the optical transceiver.
  • the lens portions 51 and 61 are housed in the lens holders 50 and 60.
  • the diameter of the through hole of the lens holders 50 and 60 is larger than the diameter of the lens portions 51 and 61. Therefore, the lens holders 50 and 60 are provided so as to be joinable to the lens barrels 51b and 61b at arbitrary positions in the direction along the optical axis of the lenses 51a and 61a on the inner side surface forming the through hole. Therefore, the positions of the lens portions 51 and 61 can be adjusted within the lens holders 50 and 60.
  • the optical element mounting portion 10 and the lens holders 50 and 60 are directly joined.
  • the lens holders 50 and 60 and the receptacles 55 and 65 are directly joined.
  • the receptacles 55 and 65 of the present embodiment do not slide. Therefore, by adjusting the positions of the lens portions 51 and 61, the distance between the optical element mounting portion 10 and the receptacles 55 and 65 does not change, and the positions of the parts can be easily adjusted.
  • the optical module 100 can be easily arranged on the optical transceiver.
  • the positions of the lens portions 51 and 61 in the lens holders 50 and 60 in the direction along the optical axis are adjusted. Therefore, by adjusting the positions of the lens portions 51 and 61, the distance between the optical element mounting portion 10 and the receptacles 55 and 65 does not change, and the positions of the parts can be easily adjusted.
  • the optical module 100 can be easily arranged on the optical transceiver.
  • the positions of the flanges 56 and 66, which are the reference for positioning the optical module 100, are aligned in the optical axis direction. Can be done. As a result, the duplex type optical connector can be connected to the optical module 100.
  • the joint surface between the lens holder 50 and the receptacle 55 is made parallel, and the lens is housed in the lens holder 50. Adjust the position of 51a in the optical axis direction. That is, the lens 51a can be adjusted to the optimum coupling position by simulating the state of being assembled as the optical module 100.
  • the receptacle 55 is arranged with respect to the optical element mounting portion 110 via the lens portion 51 and the receptacle holder 153, and optical coupling is established.
  • the lens portion 51 is adjusted and fixed in the direction perpendicular to the optical axis with respect to the optical element mounting portion 110 so that the coupling efficiency to the optical fiber 57 is maximized.
  • the angle of the receptacle holder 153 is adjusted so that the joint surface between the lens portion 51 and the receptacle holder 153 is parallel, and the lens portion 51 and the receptacle holder 153 are brought into close contact with each other.
  • the receptacle 55 is three-dimensionally aligned.
  • the receptacle holder 153 and the receptacle 55 are laser welded at the position where the coupling efficiency is maximized, and the position in the optical axis direction is fixed.
  • the angle is adjusted again so that the joint surface between the lens portion 51 and the receptacle holder 153 is parallel, and the receptacle 55 is centered in the joint surface.
  • the coupling efficiency decreases and the light output decreases.
  • FIG. 11 is a cross-sectional view of the optical module 101 according to the first comparative example.
  • FIG. 12 is a sectional view taken along the line CC of FIG.
  • a laser welded portion 171 is formed between the receptacle 55 and the receptacle holder 153.
  • the misalignment indicated by the arrow 181a is corrected in the direction indicated by the arrow 181b by the laser welded portion 172 by laser hammering.
  • the optical element mounting portion 110 is pushed so as to be in close contact with the heat dissipation sheet 13 in the direction indicated by the arrow 80.
  • a force is applied to the receptacle holder 153 and the laser welded portion 171 of the receptacle 55, and the structure of the optical module 101 may be distorted to cause axial misalignment.
  • a portion 171a that contributes to joining is formed so as to connect the side surface of the receptacle holder 153 and the side surface of the receptacle 55.
  • the end face 50a of the lens holder 50 and the end face 55a of the receptacle 55 are joined. Therefore, the area of the portion contributing to the joining of the receptacle 55 and the lens holder 50 of the present embodiment is much larger than the area of the portion 171a contributing to the joining in the comparative example.
  • a shear stress is generated at the joint portion between the receptacle holder 153 and the receptacle 55 with respect to the stress shown by the arrow 80.
  • a tensile stress is generated at the joint portion between the lens holder 50 and the receptacle 55 with respect to the stress indicated by the arrow 80.
  • the resistance to tensile stress is about twice the resistance to shear stress. From the above, in the present embodiment, the resistance to the stress applied to the lens holder 50 and the receptacle 55 can be improved.
  • the place where the stress is applied and the place where the laser hammering is performed are both between the receptacle holder 153 and the receptacle 55. Therefore, if the joint strength of the laser welded portion 171 is increased in order to increase the resistance to stress, the amount of displacement due to laser hammering becomes smaller. That is, it may be difficult to correct the position of the receptacle 55 by laser hammering.
  • the laser welded portion 72 by laser hammering is formed at a position different from the laser welded portion 70 to which stress is applied. Therefore, the receptacle 55 and the lens holder 50 can be firmly fixed, and the position of the lens 51a can be corrected by laser hammering. Therefore, the position of the component can be easily adjusted.
  • FIG. 13 is a diagram showing the relationship between the inclination of the prisms 24 and 25 and the mirrors 126a to 126d and the coupling efficiency.
  • FIG. 13 shows the calculation result of the coupling efficiency when the deviation from the optimum angle of the mirrors 126a to 126d occurs.
  • the optical module 101 according to the comparative example when the angles of the mirrors 126a to 126d deviate from the optimum angle, the coupling efficiency is significantly reduced. Therefore, it may be difficult to adjust the mirrors 126a to 126d to the optimum angle. Further, in the optical module 101 according to the comparative example, the mirrors 126a to 126d are mounted on separate substrates 21, 31, and 41.
  • a slight change in angle may occur due to a change in the ambient temperature of the optical module 101 or the temperature of the substrates 21, 31, and 41, and the light output may change. Further, there is a possibility that an angular deviation after fixing the mirrors 126a to 126d may occur due to peeling of the adhesive for fixing the mirrors 126a to 126d. In this case, a significant decrease in light output may occur.
  • the reflecting surfaces 24a and 24b of the prism 24 are orthogonal to each other. Therefore, the incident light rays 82a and the emitted light rays 82b on the prism 24 are parallel to each other regardless of the mounting angle of the prism 24 in a plan view. Therefore, unlike the optical module 101, it is not necessary to adjust the angle of the mirror with high accuracy.
  • the light source unit 20 is also mounted according to the incident position of the light transmission unit 30.
  • the position of the light source unit 20 and the incident position of the light transmission unit 30 are displaced. May occur. Even in such a case, the incident light ray 82a can be adjusted to the incident position of the light transmitting unit 30 by changing the position of the prism 24 as shown in FIGS.
  • the optical axis can be easily adjusted by adjusting the positions of the prisms 24 and 25, and a good coupling state can be obtained.
  • each of the prisms 24 and 25 is mounted on one substrate.
  • the transmitting side mirrors 126c and 126d are mounted on the plurality of boards 21 and 31, or the receiving side mirrors 126a and 126b are mounted on the plurality of boards 21 and 41.
  • the prisms 24 and 25 are mounted on one of the plurality of substrates 21, 31 and 41. Therefore, even when the substrates 21, 31, and 41 are distorted due to a change in ambient temperature or the like, a decrease in coupling efficiency can be further suppressed.
  • FIG. 14 is a side view of the lens holder 250 according to the modified example of the first embodiment.
  • FIG. 15 is a cross-sectional view of the lens holder 250 according to the modified example of the first embodiment.
  • the lens holder 250 is formed with a slit 250b that exposes the lens barrel 51b. As a result, the lens portion 51 can be moved through the slit 250b. Therefore, the position of the lens unit 51 in the optical axis direction can be easily adjusted.
  • FIG. 16 is a plan view and a front view of the prism 324 according to the first modification of the first embodiment.
  • the prism 324 has a plurality of reflecting surfaces 324a and 324b orthogonal to each other.
  • the light reflected by the reflecting surface 24a passes through the inside of the prism.
  • the prism 324 the light reflected by the reflecting surface 324a propagates in space. Since the light propagates in space, the transmission loss due to the material of the prism 324 can be suppressed. Further, as the prism 324, a metal or plastic molded product can be used.
  • FIG. 17 is a diagram illustrating a configuration of a prism 424 according to a second modification of the first embodiment.
  • the prism 424 has three reflecting surfaces 424a, 424b, and 424c that are orthogonal to each other.
  • the number of reflecting surfaces of the prism is not limited and may be three. In a structure having three reflecting surfaces, the incident light and the emitted light are completely parallel regardless of the three-dimensional angle of the integrated prism 424. Therefore, it is not necessary to adjust the angle of the prism 424, and the assembly can be facilitated.
  • the optical element mounting unit 10 includes a light source unit 20, an optical transmission unit 30, and an optical reception unit 40 has been described.
  • the optical element mounting unit 10 may include at least one of the optical transmitting unit 30 and the optical receiving unit 40.
  • the prisms 24 and 25 are mounted on the substrate 21.
  • the prisms 24 and 25 may be mounted on the substrate 31 or the substrate 41.
  • the prisms 24 and 25 may be mounted on different substrates.
  • the parts are joined by laser welding. Not limited to this, the parts may be bonded with an adhesive.
  • FIG. 18 is a plan view of the optical module 500 according to the second embodiment.
  • the configuration of the optical element mounting portion 510 is different from the configuration of the first embodiment.
  • the substrates 21 and 31 are provided on the main surface of the optical element mounting portion 510.
  • the substrate 41 is provided above the substrate 21.
  • a prism 24, 527, 528 and a mirror 529 are mounted on the substrate 21.
  • FIG. 19 is a diagram illustrating the configuration of the prism 527, 528 and the mirror 529 according to the second embodiment.
  • the prism 527 has two reflecting surfaces 527a and 527b that are orthogonal to each other.
  • the prism 527 reflects the light from the light source unit 20 upward and causes it to enter the light receiving unit 40.
  • the prism 528 has two reflecting surfaces 528a and 528b that are orthogonal to each other.
  • the prism 528 reflects the light from the lens 61a upward and causes it to enter the light receiving unit 40.
  • the light ray 83a from the light source unit 20 is converted into parallel light by the lens 23, reflected and deflected by the prism 527, and becomes the light ray 83b.
  • the light beam 83b is focused on the light receiving unit 40 by the lens 42.
  • the light ray 84a of the optical signal incident from the receptacle 65 is reflected and deflected at a right angle by the prism 528 to become the light ray 84b.
  • the light ray 84b is further reflected and deflected at a right angle by the mirror 529 to become the light ray 84c.
  • the light beam 84c is focused on the light receiving unit 40 by the lens 43.
  • the reflecting surfaces 527a and 527b are orthogonal to each other, the light rays 83a and the light rays 83b are parallel regardless of the mounting angle of the prism 527. Further, since the reflecting surfaces 528a and 528b are orthogonal to each other, the light rays 84a and the light rays 84b are at right angles regardless of the mounting angle of the prism 528. Therefore, unlike the optical module 101 according to the comparative example, it is not necessary to adjust the angle of the mirror with high accuracy.
  • the shape of the prism 527 is the same as that of the prism 24 of the first embodiment. Therefore, by changing the position of the prism 527 as shown in FIGS. 7 and 8, the light from the light source unit 20 can be adjusted to the incident position of the light receiving unit 40.
  • FIG. 20 is a diagram illustrating a method of adjusting an incident light ray to the light receiving unit 40.
  • the prism 528 is displaced back and forth with respect to the light beam 84a.
  • the ray 84c is displaced in the horizontal direction as shown by the arrow 84f, and the ray 84e is obtained. Therefore, the incident position can be adjusted in the horizontal direction.
  • FIG. 21 is a diagram illustrating another method of adjusting the incident light beam on the light receiving unit 40.
  • the prism 528 is displaced left and right with respect to the light beam 84a, as shown by arrow 84g.
  • the ray 84c is displaced in the height direction as shown by the arrow 84i, and the ray 84h is obtained. Therefore, the incident position can be adjusted in the height direction.
  • the optical axis of the optical system can be easily adjusted by adjusting the positions of the prisms 527 and 528. Therefore, the position of the component can be easily adjusted, and a good bonded state can be obtained.
  • the light source unit 20 and the light receiving unit 40 are arranged so as to overlap each other.
  • the optical module 500 can be miniaturized.
  • the light source unit 20 and the light transmission unit 30 need to be temperature controlled. In order to control the temperature efficiently, it is preferable that the light source unit 20 and the light transmission unit 30 are in close thermal contact with the housing 12. Therefore, it is preferable that the light source unit 20 and the light transmission unit 30 are arranged in the lower stage of the two-stage structure.
  • the optical receiving unit 40 generally has a small temperature dependence, and there is no need to control the temperature. Therefore, it may be arranged in the upper stage of the two-stage structure.
  • FIG. 22 is a diagram illustrating the configuration of the prism 628 according to the modified example of the second embodiment.
  • the prism 628 has a plurality of reflecting surfaces 628a and 628b that are orthogonal to each other.
  • the light reflected by the reflecting surface 628a propagates in space. Since the light propagates in space, the transmission loss due to the material of the prism 628 can be suppressed.
  • the prisms 527 and 528 are mounted on the substrate 21. Not limited to this, the prisms 527 and 528 may be mounted on the substrate 31.
  • FIG. 23 is a plan view of the optical module 700 according to the third embodiment.
  • lens portions 51 and 61 are provided between the optical element mounting portion 10 and the receptacles 755 and 765.
  • Receptacle holders 153 and 163 are provided at the ends of the lens portions 51 and 61 on the opposite side of the optical element mounting portion 10.
  • the receptacles 755 and 765 slide inside the receptacle holders 153 and 163. This makes it possible to adjust the positions of the receptacles 755 and 765 in the optical axis direction.
  • the receptacle 755 has a main body portion 758 and a flange 756.
  • the main body 758 has a tubular shape and houses the optical fiber 57.
  • the flange 756 is attached to a side surface forming the outer edge of the main body 758 and projects outward from the side surface.
  • the receptacle 765 has a main body portion 768 and a flange 766.
  • the main body 768 has a tubular shape and houses the optical fiber 67.
  • the flange 766 is attached to a side surface forming the outer edge of the main body 768 and projects outward from the side surface.
  • the flanges 756 and 766 are configured as separate parts from the main body 758 and 768.
  • the flange 756 and the main body 758 are joined, for example, by laser welding or an adhesive.
  • the receptacle 755 is slid in the receptacle holder 153 according to the variation in the light collection position in the optical axis direction by the lens unit 51 or the variation in the position of the incident surface of the optical fiber 57.
  • the position of the receptacle 755 can be adjusted, and the light collection position and the position of the optical fiber incident surface can be aligned. Therefore, good optical coupling can be realized.
  • the receptacle 765 is slid in the receptacle holder 163 according to the variation in the fixed position of the lens 43 or the variation in the position of the exit surface of the optical fiber 67. As a result, the position of the receptacle 765 can be adjusted and good optical coupling can be realized.
  • the flanges 756 and 766 of the receptacles 755 and 765 are configured as separate parts from the main body portions 758 and 768. Therefore, the positions of the flanges 756 and 766 can be set independently of the main body portions 758 and 768. Therefore, even if there is a difference 85 in the positions of the receptacles 755 and 765 in the optical axis direction, the flanges 756 and 766 can be aligned and attached to the main body portions 758 and 768. Therefore, the position of the component can be easily adjusted.
  • the optical module 700 can be easily arranged on the optical transceiver. In the example shown in FIG. 23, the distance from the optical element mounting portion 10 to the flange 756 is equal to the distance from the optical element mounting portion 10 to the flange 766.
  • the positions of the flanges 756 and 766, which are the reference for positioning the optical module 700, are aligned in the optical axis direction. Can be done. Therefore, the optical module 700 can be applied to an optical transceiver corresponding to a duplex type optical connector.
  • the position of the lens may be adjusted in the lens holder as in the first embodiment.
  • Optical element mounting part 11 Flexible board, 12 housing, 13 heat dissipation sheet, 14 holding part, 20 light source part, 21 board, 22 lens, 23 lens, 24 prism, 24a, 24b reflective surface, 25 prism, 25a, 25b Reflective surface, 30 light transmitter, 31 substrate, 32 lens, 33 lens, 40 light receiver, 41 substrate, 42 lens, 43 lens, 50 lens holder, 50a end face, 51 lens unit, 51a lens, 51b lens barrel, 55 Receptacle, 55a end face, 56 flange, 57 optical fiber, 58 body part, 60 lens holder, 60a end face, 61 lens part, 61a lens, 61b lens barrel, 65 receptacle, 65a end face, 66 flange, 67 optical fiber, 68 body part.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
PCT/JP2020/040273 2020-10-27 2020-10-27 光モジュールおよび光モジュールの製造方法 Ceased WO2022091222A1 (ja)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02108349U (https=) * 1989-02-17 1990-08-29
JPH08297230A (ja) * 1995-04-27 1996-11-12 Oki Electric Ind Co Ltd 光結合器
JP2007049125A (ja) * 2005-07-11 2007-02-22 Fujifilm Corp レーザモジュール
US20130163629A1 (en) * 2011-12-23 2013-06-27 Electronics And Telecommunications Research Institute User-selectable laser and optical transmitter having the same
WO2017006515A1 (ja) * 2015-07-09 2017-01-12 日本電気株式会社 プラガブル光モジュール及び光通信システム
JP2018063350A (ja) * 2016-10-13 2018-04-19 三菱電機株式会社 半導体受光モジュール
US20180284370A1 (en) * 2017-03-29 2018-10-04 Applied Optoelectronics, Inc. Welding assembly for coupling a transmitter optical subassembly (tosa) module to an optical transmitter or transceiver

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02108349U (https=) * 1989-02-17 1990-08-29
JPH08297230A (ja) * 1995-04-27 1996-11-12 Oki Electric Ind Co Ltd 光結合器
JP2007049125A (ja) * 2005-07-11 2007-02-22 Fujifilm Corp レーザモジュール
US20130163629A1 (en) * 2011-12-23 2013-06-27 Electronics And Telecommunications Research Institute User-selectable laser and optical transmitter having the same
WO2017006515A1 (ja) * 2015-07-09 2017-01-12 日本電気株式会社 プラガブル光モジュール及び光通信システム
JP2018063350A (ja) * 2016-10-13 2018-04-19 三菱電機株式会社 半導体受光モジュール
US20180284370A1 (en) * 2017-03-29 2018-10-04 Applied Optoelectronics, Inc. Welding assembly for coupling a transmitter optical subassembly (tosa) module to an optical transmitter or transceiver

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