WO2021163953A1 - Système de couplage optique, module optique et dispositif de communication optique - Google Patents

Système de couplage optique, module optique et dispositif de communication optique Download PDF

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Publication number
WO2021163953A1
WO2021163953A1 PCT/CN2020/076008 CN2020076008W WO2021163953A1 WO 2021163953 A1 WO2021163953 A1 WO 2021163953A1 CN 2020076008 W CN2020076008 W CN 2020076008W WO 2021163953 A1 WO2021163953 A1 WO 2021163953A1
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WIPO (PCT)
Prior art keywords
optical
coupling system
optical signal
signal
port
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Application number
PCT/CN2020/076008
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English (en)
Chinese (zh)
Inventor
倪日文
蒋艳锋
王安军
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2020/076008 priority Critical patent/WO2021163953A1/fr
Priority to CN202080091983.8A priority patent/CN114902102B/zh
Publication of WO2021163953A1 publication Critical patent/WO2021163953A1/fr

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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 application relates to the field of optical communication technology, and in particular to an optical coupling system, an optical module, and an optical communication device.
  • VCSEL Vertical Cavity Surface Emitting Laser
  • COB chip-on-board
  • the optical coupling system 10 includes an optical body 11 and a filter 16, wherein the optical body 11 has a bottom boundary surface 11a and a first side boundary surface 11b, and the bottom boundary surface 11a is provided with a receiving For the lens 12 and the output lens 13, a fiber lens 14 is provided on the first side boundary surface 11b.
  • the optical body 11 is also provided with a total internal reflection surface 11d and a mounting groove 15 between the total internal reflection surface 11d and the first side boundary surface 11b.
  • the side surface of the mounting groove 15 close to the first side boundary surface 11b is the mounting surface 15a, the mounting surface 15a is inclined relative to the bottom boundary surface 11a and the first side boundary surface 11b, and the filter 16 is bonded to the mounting surface 15a by optical glue.
  • the filter 16 includes two optical surfaces: a first optical surface 16a and a second optical surface 16b.
  • the first optical surface 16a and the second optical surface 16b are respectively provided with functional films with different optical properties.
  • the fiber lens 14 Reflected and collimated by the fiber lens 14 to be output to the outside of the optical body 11.
  • the second optical signal optical signal with a wavelength of ⁇ 2
  • the second light The signal is collimated by the optical fiber lens 14 and then irradiated on the filter 16, and passed through the filter 16, and irradiated on the total internal reflection surface 11d. Total reflection, and the second optical signal after total reflection is collimated out of the optical body 11 by the output lens 13 outside.
  • optical coupling system 10 two-way optical communication can be realized.
  • the filter 16 and the mounting surface 15a are bonded by optical glue, when the optical glue is applied, air bubbles may be formed in the optical glue. The air bubbles will affect the transmittance and reflectivity of the filter 16, thereby The performance of the optical coupling system 10 is reduced.
  • the embodiments of the present application provide an optical coupling system, an optical module, and an optical communication device, which are used to prevent bubbles in the optical glue from affecting the transmittance and reflectance of the filter, and improve the performance of the optical coupling system.
  • an embodiment of the present application provides an optical coupling system, which includes an optical body and a light conversion element, wherein the optical body is provided with a mounting groove, the mounting groove has a mounting surface, and the mounting surface is provided with a groove;
  • the light conversion element is located in the installation groove, and the connection surface of the light conversion element is connected with the installation surface around the groove, and the connection surface and the groove form a hollow area;
  • the optical body is also provided with a receiving port, an output port and a two-way communication port, wherein The two-way communication port is used to output: the first optical signal that enters the optical body from the receiving port and passes through the light conversion element and the hollow area; and is used to input the second optical signal into the optical body, and the second optical signal passes through The hollow area is emitted to the light conversion element and then output from the output port; and the wavelength of the second optical signal is different from the wavelength of the first optical signal.
  • the groove and a part of the connecting surface of the light conversion element located in the notch area of the groove are enclosed in a hollow
  • the hollow area is located on the optical signal propagation path between the optical conversion element and the bidirectional communication port. Since the mounting surface is provided with a groove, the part of the connection surface in the notch area of the groove does not need to be provided with optical glue.
  • the optical body has a first side boundary surface and a second side boundary surface that are disposed oppositely, and are located on the first side boundary surface and the second side boundary surface.
  • the receiving port and the output port are located on the bottom boundary surface, and the two-way communication port is located on the first side boundary surface.
  • the optical body is provided with a total internal reflection surface, and the total internal reflection surface is used to totally reflect the first optical signal injected into the optical body from the receiving port to
  • the light conversion element; the mounting groove and the light conversion element are located between the total internal reflection surface and the first side boundary surface.
  • the angle between the second side boundary surface and the bottom boundary surface is an acute angle, and the second side boundary surface forms the total internal reflection surface; or, so The second side boundary surface is connected with an inclined surface that forms an acute angle with the bottom boundary surface, and the inclined surface forms the total internal reflection surface.
  • the second side boundary surface of the optical body is used to form the total internal reflection surface, or the inclined surface connected with the second side boundary surface is used to form the total internal reflection surface, which can reduce the structural complexity of the optical body and reduce the optical body Preparation difficulty and cost; in addition, the volume of the optical body can be reduced.
  • the optical body is provided with a light reflecting groove, the light reflecting groove is located between the second side boundary surface and the mounting groove, and the light reflecting groove is adjacent to the mounting groove.
  • the inner side surface forms the total internal reflection surface.
  • the bidirectional communication port includes a fiber lens formed on the first side boundary surface, and the fiber lens is used to collimate the first light passing through the bidirectional communication port. Signal and the second optical signal.
  • the fiber lens is formed by a part of the first side boundary surface, which is beneficial to the miniaturization of the optical coupling system.
  • the receiving port includes a receiving lens formed on the bottom boundary surface, and the receiving lens is used to collimate the first optical signal passing through the receiving port;
  • the output The port includes an output lens formed on the bottom boundary surface, and the output lens is used to collimate the second optical signal passing through the output port.
  • the receiving port and the output port are respectively formed by part of the bottom boundary surface, which is beneficial to the miniaturization of the optical coupling system.
  • the mounting surface is inclined with respect to the first side boundary surface and the bottom boundary surface.
  • the connecting surface and the mounting surface located around the groove are bonded by structural glue.
  • the structural adhesive is an epoxy adhesive of UV curing type, thermal curing type or UV and thermal dual curing type.
  • the light conversion element includes: a filter having a first optical surface and a second optical surface opposed to each other, a first functional film provided on the first optical surface, and The second functional film on the second optical surface, the first functional film is used to transmit the first optical signal and to reflect the second optical signal; the second functional film is used to transmit at least part of the The first optical signal.
  • the optical body is further provided with a monitoring port and a third optical surface, the monitoring port is located between the receiving port and the output port; the third optical surface is used to make The first optical signal totally reflected from the total internal reflection surface to the third optical surface is divided into a first part and a second part, and the first part passes through the third optical surface and is emitted to the light conversion element; The second part is reflected by the third optical surface to the total internal reflection surface, is reflected again by the total internal reflection surface, and then is emitted to the monitoring port for output.
  • the normal line of the third optical surface and the center line of the first optical signal incident on the third optical surface are at a first set angle, so that the The reflection point of the first optical signal reflected by the three optical surfaces back to the total internal reflection surface on the total internal reflection surface is at the same point as the first optical signal emitted from the receiving port to the total internal reflection surface.
  • the reflection points on the total internal reflection surface are staggered.
  • the first set angle is 1 degree to 15 degrees.
  • the monitoring port includes a monitoring lens formed on the bottom boundary surface, and the monitoring lens is used to collimate the first optical signal passing through the monitoring port.
  • the groove includes a fourth optical surface and a fifth optical surface, and the fourth optical surface, the fifth optical surface, and the notch of the groove correspond to The connecting surface encloses the hollow area with a triangular cross-sectional shape, the fourth optical surface is used to transmit the first optical signal and the second optical signal, and the fifth optical surface is used to transmit at least part of the The second optical signal.
  • the normal line of the fifth optical surface and the center line of the second optical signal incident on the fifth optical surface are at a second set angle, so that from the first Five optical surfaces reflect back to the reflection point of the second light signal on the light conversion element on the reflection point of the light conversion element, and the second light signal emitted from the hollow area to the light conversion element in the light conversion
  • the reflection points on the components are staggered.
  • the second set angle is 1 degree to 15 degrees.
  • an embodiment of the present application also provides an optical module, which includes: a substrate, a driving unit, a transmitting unit, and a receiving unit, and the optical coupling system described in the first aspect; wherein the driving unit, the transmitting unit, and the The receiving unit is arranged on the substrate, and the driving unit and the transmitting unit are connected by a signal line to control the opening or closing of the transmitting unit; the transmitting unit is opposite to the receiving port of the optical coupling system, and To transmit a first optical signal to the receiving port; the receiving unit is opposite to the output port of the optical coupling system, and is used to receive the second optical signal emitted from the output port, the second optical signal The wavelength of is different from the wavelength of the first optical signal.
  • the mounting surface of the mounting groove of the optical coupling system is provided with a groove recessed into the optical body, the groove is connected to a part of the light conversion element located in the notch area of the groove.
  • the hollow area Surrounded by a hollow area, the hollow area is located on the optical signal propagation path between the optical conversion element and the two-way communication port; because the mounting surface of the mounting groove is provided with a groove, part of the connection surface located in the notch area of the groove is not Optical glue needs to be provided. Therefore, air bubbles caused by optical glue will not appear on the connecting surface in the hollow area, so that the first optical signal and the second optical signal can pass through the hollow area and reach the light conversion element without loss.
  • the transmittance and reflectivity of the light conversion element such as the filter are ensured, thereby improving the performance of the optical coupling system.
  • the optical module further includes an optical transmission line connected to the bidirectional communication port of the optical coupling system, and the optical transmission line is used to receive the first light emitted from the optical coupling system. Signal, and for transmitting a second optical signal to the optical coupling system.
  • the optical transmission line is an optical fiber
  • the driving unit is a driving circuit
  • the emitting unit is a vertical cavity surface emitting laser
  • the receiving unit is a photodiode
  • the optical module further includes a monitoring unit provided on the substrate and located between the transmitting unit and the receiving unit, and the monitoring unit is connected to the optical coupling system.
  • the ports are opposite, and are used to receive part of the first optical signal emitted from the monitoring port.
  • the monitoring unit is a monitoring photosensitive member.
  • an embodiment of the present application also provides an optical communication device, including the optical module described in the second aspect. Since the optical communication device includes the optical module described in the above second aspect, the optical communication device also has the same advantages as the optical module. For details, please refer to the above description, which will not be repeated here.
  • Figure 1 is a cross-sectional view of an optical coupling system in the related art
  • FIG. 2 is a cross-sectional view of an optical module provided by an embodiment of the application.
  • Figure 3 is a cross-sectional view of the optical coupling system in Figure 2;
  • FIG. 4 is a cross-sectional view of the optical body in FIG. 3;
  • FIG. 5 is a perspective view of an optical body and a filter before being assembled according to an embodiment of the application
  • Fig. 6 is a perspective view of the assembled optical body and filter provided by an embodiment of the application.
  • FIG. 7 is a cross-sectional view of another optical body provided by an embodiment of the application.
  • FIG. 8 is a cross-sectional view of another optical body provided by an embodiment of the application.
  • FIG. 9 is a cross-sectional view of another optical module provided by an embodiment of the application.
  • FIG. 10 is a cross-sectional view of the optical coupling system in FIG. 9;
  • Figure 11 is a cross-sectional view of the optical body in Figure 10;
  • FIG. 12 is a cross-sectional view of another optical module provided by an embodiment of the application.
  • the filter and the mounting surface are bonded by optical glue, and there may be bubbles in the optical glue.
  • the bubbles will affect the transmittance and transmittance of the filter. Reflectivity, which in turn reduces the performance of the optical coupling system.
  • the optical coupling system, optical module, and optical communication device provided in the embodiments of the present application have a pair of optical coupling system
  • the mounting surface used to install the filter is hollowed out to form a groove with a notch on the mounting surface, and the filter is connected to the mounting surface around the notch. Since the area of the notch on the mounting surface is hollowed out, the area corresponding to the notch on the filter does not need to be coated with optical glue, so no air bubbles are generated. Therefore, when the optical signal passes through the space in the groove to the filter , The transmittance and reflectivity of the filter are not affected, which improves the performance of the optical coupling system.
  • the optical module provided by the embodiments of the present application includes a substrate, a driving unit, a transmitting unit, a receiving unit, an optical transmission line, and an optical coupling system.
  • the driving unit, the transmitting unit and the receiving unit are arranged on the substrate, and the optical coupling system is packaged and driven.
  • the unit, the transmitting unit and the receiving unit, and the driving unit is connected with the transmitting unit through a signal line, and is used to control the opening and closing of the transmitting unit to realize the emission or stop of the emission of the first optical signal.
  • the optical coupling system is used to receive the first optical signal emitted by the transmitting unit and the second optical signal emitted by an optical transmission line such as an optical fiber to realize the transmission of the first optical signal and the second optical signal in two opposite directions respectively, that is, optical coupling
  • the system can realize two-way optical communication.
  • the optical coupling system usually includes an optical main body and a light conversion element.
  • the optical main body is provided with a two-way communication port, a receiving port, an output port, and a mounting groove for installing the optical conversion element.
  • the two-way communication port is used to output from the receiving port and enter the optical main body.
  • the first light signal passing through the light conversion element is used to input the second light signal into the optical main body, and the second light signal is emitted to the light conversion element and output from the output port.
  • the substrate includes but is not limited to a circuit board
  • the driving unit includes but is not limited to a driving circuit or a driving chip
  • the emitting unit includes but not limited to a vertical cavity surface emitting laser (full English name: Vertical Cavity Surface Emitting Laser, abbreviated as VCSEL)
  • the receiving unit includes but is not limited to photodiodes
  • the light conversion element includes but is not limited to filters
  • the optical body includes but is not limited to optical components
  • the two-way communication port, the receiving port and the output port include but are not limited to lenses
  • the optical transmission line includes but is not limited to Not limited to optical fiber.
  • the light conversion element is used as a filter
  • the optical transmission line is an optical fiber
  • the transmitting unit is a VCSEL
  • the receiving unit is a photodiode
  • the driving unit is a driving circuit
  • the two-way communication port, receiving port and output port are all using lenses as examples. Describe.
  • FIG. 2 is a cross-sectional view of an optical module provided by an embodiment of the application.
  • the optical module provided by the embodiment of the present application includes a substrate 20, a VCSEL 21, a photodiode 22, an optical fiber 23, a driving circuit 24, and an optical coupling system 10.
  • the VCSEL 21, the photodiode 22, and the driving circuit 24 are provided on the substrate.
  • the drive circuit 24 can be connected to the VCSEL21 signal through a signal line, and used to control the VCSEL21 to emit the first optical signal or stop emitting the first optical signal (the optical signal with wavelength ⁇ 1 in Figure 2)
  • the optical fiber 23 is used to receive the first optical signal through the optical coupling system, and is used to input the second optical signal (the optical signal with a wavelength of ⁇ 2 in Figure 2) to the optical coupling system 10, and at least part of the second optical signal is photosensitive
  • the diode 22 receives. It should be noted that the wavelength ⁇ 1 of the first optical signal and the wavelength ⁇ 2 of the second optical signal are different.
  • the optical coupling system 10 includes an optical body 11 and a filter 16, wherein the optical body 11 has a first side boundary surface 11b and a second side boundary surface 11c disposed opposite to each other, and a second side boundary surface 11c.
  • the bottom boundary surface 11a between the one side boundary surface 11b and the second side boundary surface 11c, the bottom boundary surface 11a is connected to the first side boundary surface 11b and the second side boundary surface 11c, and the bottom boundary surface 11a They are perpendicular or approximately perpendicular to the first side boundary surface 11b and the second side boundary surface 11c, respectively.
  • a receiving lens 12 and an output lens 13 are formed on the bottom boundary surface 11a.
  • the receiving lens 12 is opposite to the VCSEL 21 on the substrate 20, and is used to receive the first light signal from the VCSEL 21 and collimate the first light signal;
  • the output lens 13 Opposite to the photodiode (Photo Diode, PD for short) 22 on the substrate 20, it is used to output the second light signal emitted to the output lens 13 to the photodiode 22, and the second light signal passes through the output lens 13 It can be collimated to the photodiode 22;
  • a fiber lens 14 is formed on the first side boundary surface 11b, and the fiber lens 14 is opposite to the optical fiber 23, and is used to collimate the first optical signal and the second optical signal passing through the fiber lens 14 straight.
  • the optical body 11 is a light-transmitting body, and the first optical signal with the wavelength ⁇ 1 and the second optical signal with the wavelength ⁇ 2 can propagate in the optical body 11.
  • the material of the optical body 11 can be a high-temperature resistant polymer, such as polyetherimide (English name: Polyetherimide, referred to as PEI).
  • PEI Polyetherimide
  • the high-temperature resistant polymer is used so that the optical coupling system 10 can operate at a higher ambient temperature or Normal use at working temperature improves the reliability of the optical coupling system 10.
  • the receiving lens 12, the output lens 13 and the fiber lens 14 can be integrally formed with the optical body 11.
  • the optical body 11 and the receiving lens 12, the output lens 13 and the fiber lens 14 are integrally formed by injection molding, and the receiving lens 12 and The output lens 13 does not protrude from the bottom boundary surface 11a, and the fiber lens 14 does not protrude from the first side boundary surface 11b.
  • This design can simplify the manufacturing process of the optical coupling system 10 on the one hand, and eliminate the need for the optical body 11 on the other hand.
  • the volume is conducive to the miniaturization of the optical coupling system and the optical module.
  • the receiving lens 12, the output lens 13, and the fiber lens 14 can also be formed separately from the optical body 1, that is, the receiving lens 12, the output lens 13, the fiber lens 14 and the optical body 11 are formed first, and then the receiving lens 12.
  • the output lens 13 and the fiber lens 14 are fixed on the optical body 11, for example, glued fixation or bracket fixation.
  • the optical body 11 is further provided with a mounting groove 15 and a light reflecting groove 18, wherein the light reflecting groove 18 is close to the second side boundary surface 11c, and the mounting groove 15 Close to the first side boundary surface 11b, or, taking the optical body shown in FIG. 4 as an example, from left to right are the second side boundary surface 11c, the reflective groove 18, the mounting groove 15 and the second side edge. Interface 11b.
  • An inner side of the reflective groove 18 close to the first side boundary surface 11b (the right inner side of the reflective groove 18 in FIG.
  • TIR Total Internal Reflection
  • the mounting groove 15 is located between the total internal reflection surface 11d and the first side boundary surface 11b.
  • the mounting groove 15 includes a mounting surface 15a and a supporting surface 15e.
  • the mounting surface 15a is inclined with respect to the first side boundary surface 11b and the bottom boundary surface 11a,
  • the supporting surface 15e is connected to the mounting surface 15a, and the included angle between the two may be approximately 90 degrees.
  • the filter 16 is mounted on the mounting surface 15a. Since the mounting surface 15a is inclined with respect to the bottom boundary surface 11a, the filter 16 is also inclined with respect to the bottom boundary surface 11a.
  • the side surface of the filter 16 directed toward the bottom boundary surface 11a is opposed to the supporting surface 15e.
  • the supporting surface 15e is used to cooperate with the mounting surface 15a to jointly support the filter 16 and improve the installation stability of the filter 16 in the mounting groove 15.
  • a groove 17 is provided on the mounting surface 15 a, and the groove 17 is located on the optical signal transmission path between the fiber lens 14 and the filter 16.
  • the groove 17 includes a fourth optical surface 17b and a fifth optical surface 17a connected to each other.
  • the cross-sectional shape of the groove 17 is a triangle, and the fourth optical surface 17b and the fifth optical surface 17a are concave respectively.
  • the fourth optical surface 17b and the fifth optical surface 17a may be perpendicular or approximately perpendicular to each other.
  • An optical surface 16a encloses a hollow area, and the hollow area is the space enclosed by the groove 17.
  • the filter 16 includes a first optical surface 16a and a second optical surface 16b that are arranged oppositely, wherein the first optical surface 16a is plated with a first functional film, and the first functional film can reflect the second optical signal and transmit the first optical signal; A second functional film is plated on the second optical surface 16b. The second functional film is used to transmit the first optical signal, or to transmit a part of the first optical signal into the filter 16, and reflect another part of the first optical signal to the mounting groove 15. outside.
  • the filter 16 is fixedly installed in the mounting groove 15.
  • the first optical surface 16a of the filter 16 is the connecting surface connected to the mounting surface 15a, and the first optical surface 16a of the filter 16 is fixed to the mounting surface 15a located around the groove 17. Connection, for example, using structural adhesive bonding.
  • the area corresponding to the notch of the mounting surface 15a and the groove 17 is removed, so that the area corresponding to the notch of the first optical surface 16a and the groove 17 has no bonding object. Therefore, in this area, the first optical surface 16a and The area corresponding to the notch of the groove 17 does not need to be provided with structural adhesive.
  • the filter 16 is fixedly installed on the mounting surface 15a by using the structural adhesive, the part of the first optical surface corresponding to the notch of the groove 17 is There is no need to provide structural glue on 16a. Therefore, no bubbles will be generated in the first optical surface 16a or structural glue corresponding to the notch of the groove 17, so that the first optical signal and the second optical signal can pass through the filter 16 and The optical signal propagation path between the optical fiber lenses 14 passes through the hollow area basically without loss. Compared with the bubbles in the optical glue on the first optical surface 16a in the related art, the transmittance and reflectance of the filter 16 are ensured. The performance of the optical coupling system 10 is improved.
  • FIG. 5 is a perspective view of an optical body and a filter before being assembled according to an embodiment of the application
  • FIG. 6 is a perspective view of the optical body and a filter after being assembled according to an embodiment of the application.
  • the mounting groove 15 is an elongated groove.
  • a groove 17 is provided in the middle of the mounting surface 15a.
  • the notch of the groove 17 is formed on the mounting surface 15a.
  • the groove body of the groove 17 is concave.
  • the first optical surface 16a of the filter 16 and the mounting surfaces 15a on both sides of the groove 17 are bonded by structural glue.
  • the structural glue includes but is not limited to UV curing type, thermal curing type or UV And thermal dual-curing epoxy adhesive.
  • the filter 16 is bonded and fixed by structural adhesive. Compared with the optical adhesive used in the related art to bond and fix the filter 16, the structural adhesive has the advantages of high strength, large bonding force, aging resistance, fatigue resistance and corrosion resistance, etc., so that it can The risk of the filter 16 falling off the optical body 11 is reduced.
  • the structural glue is provided between the first optical surface 16a of the filter 16 and the mounting surface 15a around the notch of the groove 17, but it is not limited to this, and the structural glue can also be arranged on Fix the filter 16 on the mounting surface 15a at other positions.
  • the structural glue is set between the side 16c of the filter 16 and the side 15c of the mounting groove 15, and the side of the filter 16 Between 16d and the side surface 15d of the mounting groove 15, the side surface 16c and the side surface 15c, and the side surface 16d and the side 15d are bonded with structural adhesive.
  • the first optical surface 16a and the mounting surface 15a of the filter 16 can be directly bonded. For bonding, no structural glue is required between the two.
  • the two-way optical communication process of the optical coupling system 10 with the above-mentioned structure is as follows:
  • the second optical signal output from the optical fiber 23 (the optical signal with a wavelength of ⁇ 2 in FIG. 2) is incident on the optical fiber lens 14, collimated by the optical fiber lens 14, and then enters the optical body 11, and the second optical signal is emitted in the optical body 11.
  • the second optical signal can pass through the hollow area 17 without any damage and then is transmitted to the first optical surface 16a of the filter 16, and the second optical signal is in the filter 16.
  • the first optical surface 16a of the filter 16 is reflected by the first optical surface 16a of the filter 16 to the output lens 13, collimated by the output lens 13, and then directed toward the photodiode 22.
  • the first optical signal sent from the VCSEL 21 (the optical signal with the wavelength ⁇ 1 in Figure 2) is directed to the receiving lens 12, collimated by the receiving lens 12, and then directed to the total internal reflection surface 11d in the optical body 11, and the first optical signal is projected After reaching the total internal reflection surface 11d, it is totally reflected by the total internal reflection surface 11d to the second optical surface 16b of the filter 16. At this time, the first optical signal will not be reflected, but will be refracted into the filter 16 and reach the filter.
  • the first optical signal emitted from the first optical surface 16a of the filter 16 passes through the hollow area and then is incident on the fiber lens 14, collimated by the fiber lens 14, and then injected into the optical fiber 23 middle.
  • the groove 17 is provided on the installation surface 15a of the installation groove 15, the groove 17 and the first optical surface 16a corresponding to the notch of the groove 17 enclose a hollow area ,
  • the hollow area is located on the optical signal propagation path between the filter 16 and the fiber lens 14; therefore, the first optical surface 16a located in the area corresponding to the notch of the groove 17 does not need to be provided with optical glue, so that it is located in the hollow area No bubbles caused by the optical glue will appear on the first optical surface 16a, so that the first optical signal and the second optical signal can pass through the hollow area substantially without loss and reach the first optical surface 16a of the filter 16, ensuring
  • the transmittance and reflectivity of the filter 16 further improve the performance of the optical coupling system 10.
  • the total internal reflection surface 11d is formed by an inner side surface of the reflective groove 18 in the optical body 11, but it is not limited to this.
  • the optical body 11 is provided with a second side boundary surface 11c, and the second side boundary surface 11c is inclined with respect to the bottom boundary surface 11a, such as the acute angle shown in FIG. 7; the total internal reflection surface 11d is formed on On the second side boundary surface 11c, in other words, the second side boundary surface 11c is a total internal reflection surface 11d.
  • the second side boundary surface 11c is a total internal reflection surface 11d.
  • the top of the second side boundary surface 11c is connected with an inclined surface, which forms a total internal reflection surface 11d, or in other words, a total internal reflection surface 11d is formed on the second side boundary surface 11a. In the top slope.
  • the total internal reflection surface 11d is formed on the boundary surface of the optical body 11, which simplifies the structure of the optical body 11, and also reduces the volume of the optical body 11, which is beneficial to optics. Miniaturization of coupling systems and optical modules.
  • FIG. 9 is a cross-sectional view of another optical module provided by an embodiment of the application.
  • the optical module provided by the embodiment of the present application includes a substrate 20, a VCSEL 21, a photodiode 22, an optical fiber 23, a driving circuit 24, a monitoring photosensitive member 25, and an optical coupling system 10, where the VCSEL 21, the photodiode 22, and the optical fiber 23.
  • the setting mode and function of the driving circuit 24 and the substrate 20 are basically the same as those in the above scenario 1, so please refer to the above related description.
  • the optical coupling system 10 provided by the embodiment of the present application includes an optical body 11 and a filter 16, wherein the optical body 11 has a first side boundary surface 11b and a second side edge disposed oppositely.
  • the interface 11c, and the bottom boundary surface 11a between the first side boundary surface 11b and the second side boundary surface 11c; the bottom boundary surface 11a is formed with a receiving lens 12, an output lens 13 and a monitoring lens 19, the first side An optical fiber lens 14 is formed on the boundary surface 11b.
  • the receiving lens 12, the output lens 13 and the optical fiber lens 14 are the same as the setting methods and functions in the above scenario 1, please refer to the above related description.
  • the monitoring lens 19 is formed on the bottom boundary surface 11a and is opposite to the monitoring photosensitive member 25 on the substrate 20, and is used to receive the light reflected by the third optical surface 15b back to the total internal reflection surface 11d and again on the total internal reflection surface 11d. Part of the first optical signal.
  • the monitoring lens 19 is located between the receiving lens 12 and the output lens 13, and correspondingly, the monitoring photosensitive member (English full name: Monitor photodiode, MPD for short) 25 is located between the VCSEL 21 and the photosensitive diode 22, which is similar to the monitoring photosensitive member 25 in the related technology.
  • the signal line connecting the VCSEL 21 and the driving circuit 24 does not need to bypass the monitoring photosensitive member 25, which shortens the length of the signal line and improves the performance of the optical module.
  • the optical body 11 is further provided with a mounting groove 15 and a light reflecting groove 18, wherein the light reflecting groove 18 is close to the second side boundary surface 11c, and the mounting groove 15 Close to the first side boundary surface 11b, the inner surface of the reflective groove 18 close to the first side boundary surface 11b is a total internal reflection surface 11d.
  • the total internal reflection surface 11d is inclined relative to the bottom boundary surface 11a for total reflection by the receiving lens 12
  • the first optical signal directed to the total internal reflection surface 11 d reaches the filter 16.
  • the mounting groove 15 is located between the total internal reflection surface 11d and the first side boundary surface 11b.
  • the mounting groove 15 includes a mounting surface 15a and a supporting surface 15e.
  • the mounting surface 15a is inclined with respect to the first side boundary surface 11b and the bottom boundary surface 11a,
  • the supporting surface 15e is connected to the mounting surface 15a, and the included angle between the two may be approximately 90 degrees.
  • the filter 16 is mounted on the mounting surface 15a. Since the mounting surface 15a is inclined with respect to the bottom boundary surface 11a, the filter 16 is also inclined with respect to the bottom boundary surface 11a.
  • the side surface of the filter 16 directed toward the bottom boundary surface 11a is opposed to the support surface 15e, and the support surface 15e and the mounting surface 15a jointly support the filter 16 so that the filter 16 is stably installed in the mounting groove 15.
  • a groove 17 is provided on the mounting surface 15 a, and the groove 17 is located on the optical signal transmission path between the fiber lens 14 and the filter 16.
  • the groove 17 includes a fourth optical surface 17 b and a fifth optical surface 17 a that are connected to each other.
  • the cross-sectional shape of the groove 17 is a triangle.
  • the fourth optical surface 17 b and the fifth optical surface 17 a are two side surfaces of the groove 17, respectively.
  • the angle between the fourth optical surface 17b and the fifth optical surface 17a is an obtuse angle
  • the fourth optical surface 17b and the fifth optical surface 17a are located between the fourth optical surface 17b and the fifth optical surface 17a.
  • the first optical surface 16a therebetween forms a hollow area.
  • the filter 16 includes a first optical surface 16a and a second optical surface 16b that are arranged oppositely, wherein the first optical surface 16a is plated with a first functional film, and the first functional film can reflect the second optical signal and transmit the first optical signal; A second functional film is plated on the second optical surface 16b. The second functional film is used to transmit the first optical signal, or to transmit a part of the first optical signal into the filter 16, and reflect another part of the first optical signal to the mounting groove 15. outside.
  • the filter 16 is fixedly installed in the mounting groove 15.
  • the first optical surface 16a of the filter 16 is a connecting surface connected to the mounting surface 15a, and the first optical surface 16a is fixedly connected to the mounting surface 15a located around the groove 17, for example, Structural adhesive bonding.
  • the first optical surface 16a corresponding to the notch of the groove 17 is not provided with structural adhesive. Therefore, the structural adhesive is used to fix the filter 16 on the mounting surface 15a while the notch of the groove 17 corresponds to the first optical surface.
  • the mounting groove 15 also includes a third optical surface 15b, the third optical surface 15b is located between the total internal reflection surface 11d and the mounting surface 15a, the third optical surface 15b is used to transmit a part of the first light signal into the filter 16, and reflect the other A part of the first optical signal reaches the total internal reflection surface 11d, that is, the first optical signal is divided into two parts after being incident on the third optical surface 15b: a first part and a second part, wherein the first part of the first optical signal is transparent It passes through the third optical surface 15b to the filter 16; the second part of the first optical signal is reflected by the third optical surface 15b back to the total internal reflection surface 11d.
  • the incident point of the first optical signal from the receiving lens 12 to the total internal reflection surface 11d and the incident point of the first optical signal reflected from the third optical surface 15b on the total internal reflection surface 11d cannot coincide, so that the self-receiving lens 12
  • the reflection point of the first optical signal directed to the total internal reflection surface 11d on the total internal reflection surface 11d and the reflection point of the first optical signal reflected from the third optical surface 15b on the total internal reflection surface 11d are staggered to prevent self
  • the first optical signal reflected by the third optical surface 15b is reflected back to the VCSEL 21 by the total internal reflection surface 11d, thereby preventing this part of the first optical signal reflected from the third optical surface 15b from affecting the VCSEL 21 to emit the first optical signal, and improving the resistance of the VCSEL 21 Intrusive.
  • the normal line of the third optical surface 15b and the center line of the first optical signal incident on the third optical surface 15b are at a first set angle.
  • the angle between the center lines of the first optical signal on the surface 15b is the first set angle, so that the first optical signal reflected from the third optical surface 15b back to the total internal reflection surface 11d is on the total internal reflection surface 11d.
  • the reflection point is offset from the reflection point on the total internal reflection surface 11d of the first optical signal emitted from the receiving lens 12 to the total internal reflection surface 11d to prevent the third optical surface 15b from being reflected back to the first optical signal on the total internal reflection surface 11d.
  • the optical signal is reflected again on the total internal reflection surface 11d and then reflected back to the receiving lens 12, thereby preventing it from interfering with the first optical signal emitted by the VCSEL 21.
  • the first optical signal reflected by the third optical surface 15b is also called the return loss light of the first optical signal.
  • the optical path of the first optical signal is longer, which increases the volume of the optical body 11.
  • the first set angle may be 1 degree to 15 degrees, for example, the first set angle is 8 degrees.
  • the second optical signal when the second optical signal is reflected from the first optical surface 16a of the filter 16 to the fifth optical surface 17a, the second optical signal may also be divided into two parts: a part of the second optical signal passes through the fifth optical surface. After surface 17a, it is directed to the photodiode 22; another part of the second light signal is reflected on the fifth optical surface 17a and then directed to the first optical surface 16a of the filter 16, and on the first optical surface 16a of the filter 16 again After reflection, it is shot out of the installation slot 17.
  • the second optical signal reflected by the fifth optical surface 17a back to the first optical surface 16a is on the first optical surface 16a and the second optical signal emitted by the fiber lens 14 to the first optical surface 16a is on the first optical surface 16a
  • the second optical signal reflected by the fifth optical surface 17a back to the first optical surface 16a is reflected on the first optical surface 16a, and the second optical signal emitted by the fiber lens 14 to the first optical surface 16a
  • the reflection points on the first optical surface 16a are staggered.
  • the normal line of the fifth optical surface 17a and the center line of the second optical signal incident on the fifth optical surface 17a are at a second set angle.
  • the angle between the center lines of the second optical signal on the surface 17a is the second set angle, so that the second optical signal reflected from the fifth optical surface 17a back to the first optical surface 16a is on the first optical surface 16a.
  • the reflection point, the second light signal emitted by the fiber lens 14 to the first optical surface 16a has a reflection point staggered on the first optical surface 16a to prevent the second light on the first optical surface 16a from being reflected back by the fifth optical surface 17a
  • the signal is reflected again on the first optical surface 16a and then reflected back to the optical fiber lens 14, thereby preventing it from interfering with the second optical signal emitted by the optical fiber 23.
  • the second optical signal reflected by the fifth optical surface 17a is also called the return loss light of the second optical signal.
  • the optical path of the second optical signal is longer, which increases the volume of the optical body 11.
  • the larger the second setting angle the more the second optical signal reflected by the fifth optical surface 17a back to the first optical surface 16a, and the less the second optical signal passing through the fifth optical surface 17a, that is, the return in this case There is more light loss, the utilization rate of the second optical signal is lower, and the volume of the corresponding optical body 11 becomes smaller.
  • the setting of the second setting angle requires comprehensive consideration of the amount of return loss and the size of the optical path.
  • the second setting angle can be 1 degree to 15 degrees, for example, the second setting angle is 8 degrees.
  • the two-way optical communication process of the optical coupling system 10 with the above-mentioned structure is as follows:
  • the second optical signal (optical signal with a wavelength of ⁇ 2) output from the optical fiber 23 is transmitted to the fiber lens 14, collimated by the fiber lens 14, and then enters the optical body 11, and the second optical signal is emitted to the hollow area in the optical body 11 Since there is no other substance in the hollowed-out area except air, the second optical signal can pass through the hollowed-out area 17 to the first optical surface 16a of the filter 16, and the second optical signal is on the first optical surface 16a of the filter 16.
  • the surface 16a is reflected by the first optical surface 16a to the output lens 13, collimated by the output lens 13, and then directed toward the photodiode 22.
  • the first optical signal (optical signal with a wavelength of ⁇ 1) emitted from the VCSEL 21 is directed to the receiving lens 12, collimated by the receiving lens 12, enters the optical body 11, and is directed to the total internal reflection surface 11d, and the first optical signal is directed to After the total internal reflection surface 11d is reflected to the third optical surface 15b by the total internal reflection surface 11d, the first optical signal is divided into two parts on the third optical surface 15b, and one part is transmitted to the second optical surface of the filter 16 16b, after refraction enters the interior of the filter 16, reaches the first optical surface 16a of the filter 16, and then refracts again.
  • the first optical signal emitted from the first optical surface 16a of the filter 16 passes through the hollow area and is directed to the fiber lens 14.
  • the fiber lens 14 After collimated by the fiber lens 14, it is injected into the optical fiber 23; another part of the first optical signal is reflected by the third optical surface 15b back to the total internal reflection surface 11d, and is reflected again by the total internal reflection surface 11d and then directed toward the monitoring lens 19 , After being collimated by the monitoring lens 19, it is directed to the monitoring photosensitive member 25.
  • the groove 17 is provided on the installation surface 15a of the installation groove 15, the groove 17 and the portion of the first optical surface 16b corresponding to the notch of the groove 17 enclose a hollow area ,
  • the hollow area is located on the optical signal propagation path between the filter 16 and the fiber lens 14; therefore, the first optical surface 16a located in the area corresponding to the notch of the groove 17 does not need to be provided with optical glue, so that it is located in the hollow area No bubbles caused by optical glue will appear on the first optical surface 16a of the filter 16, so that the first optical signal and the second optical signal can pass through the hollow area substantially without loss, ensuring the transmittance and transmittance of the filter 16
  • the reflectivity further improves the performance of the optical coupling system 10.
  • the first optical signal passes through the third optical surface 15b
  • the first optical signal that is reflected by the third reflective surface 15b back to the other part of the total internal reflection surface 11d is reflected again on the total internal reflection surface 11d and then directed toward the monitoring
  • the lens 19 is collimated by the monitoring lens 19 and directed toward the monitoring photosensitive member 25.
  • the monitoring photosensitive member 25 can monitor the intensity of the first light signal, so that the power of the VCSEL 21 can be monitored, and the power of the VCSEL 21 can be adjusted according to actual needs.
  • FIG. 12 is a cross-sectional view of another optical module provided by an embodiment of the application.
  • the structure of the optical module provided by the embodiment of the present application is basically the same as that of the optical module in the foregoing scenario 2, and for the same part, refer to the foregoing related description, and details are not described herein again.
  • the second functional film on the second optical surface 16b of the filter 16 can allow a part of the first optical signal directed to the second optical surface 16b to pass into the filter.
  • another part of the first optical signal is reflected out of the installation groove 15 by the second optical surface 16b.
  • the second optical surface 16b of the filter 16 can be used to reflect part of the first optical signal out of the installation groove 15, so that the first optical signal entering the optical fiber 23 can be reduced.
  • the intensity of an optical signal makes the intensity of the first optical signal that enters the optical fiber 23 basically the same every time, which improves the stability of optical fiber communication.
  • the two-way optical communication process of the optical coupling system 10 with the above-mentioned structure is as follows:
  • the second optical signal output from the optical fiber 23 After the second optical signal output from the optical fiber 23 reaches the fiber lens 14, it is collimated by the fiber lens 14 and then enters the optical body 11. The second optical signal is directed to the hollow area in the optical body 11. No other substances, so the second optical signal can pass through the hollow area 17 to the first optical surface 16a of the filter 16, and the second optical signal is transmitted by the first optical surface 16a of the filter 16. 16a is reflected to the output lens 13, collimated by the output lens 13, and then directed toward the photodiode 22.
  • the first optical signal emitted from the VCSEL 21 is directed to the receiving lens 12, collimated by the receiving lens 12, enters the optical body 11, and is directed to the total internal reflection surface 11d.
  • the first optical signal is projected onto the total internal reflection surface 11d and is The total internal reflection surface 11d is totally reflected to the third optical surface 15b, the first optical signal is divided into two parts on the third optical surface 15b, and a part of the first optical signal is reflected by the third optical surface 15b back to the total internal reflection surface 11d , And after being reflected again by the total internal reflection surface 11d, it is directed toward the monitoring lens 19, and after being collimated by the monitoring lens 19, it is directed toward the monitoring photosensitive member 25.
  • the other part is transmitted to the second optical surface 16b of the filter 16 and then divided into two parts again.
  • a part of the first optical signal is refracted into the interior of the filter 16, and then refracted again after reaching the first optical surface 16a of the filter 16, from
  • the first optical signal emitted from the first optical surface 16a of the filter 16 passes through the hollow area and then is directed to the fiber lens 14, collimated by the fiber lens 14 and then injected into the optical fiber 23; another part of the first optical signal is in the filter 16
  • the second optical surface 16b is reflected out of the installation groove 15.
  • the groove 17 is provided on the mounting surface 15a of the mounting groove 15, the groove 17 and the first optical surface 16b corresponding to the notch of the groove 17 enclose a hollow area,
  • the hollow area is located on the optical signal propagation path between the filter 16 and the fiber lens 14; therefore, there is no need to provide optical glue on the first optical surface 16a in the area corresponding to the notch of the groove 17, so that the optical glue is located in the hollow area
  • No bubbles caused by optical glue appear on the first optical surface 16a of the filter 16, so that the first optical signal and the second optical signal can pass through the hollow area substantially without loss, ensuring the transmittance and reflection of the filter 16 Therefore, the performance of the optical coupling system 10 is improved.
  • the first optical signal passes through the third optical surface 15b, another part of the first optical signal is reflected by the third reflection surface 15b back to the total internal reflection surface 11d, and is reflected again on the total internal reflection surface 11d and directed toward the monitoring
  • the lens 19 is collimated by the monitoring lens 19 and directed toward the monitoring photosensitive member 25.
  • the monitoring photosensitive member 25 can monitor the intensity of the first light signal, so that the power of the VCSEL 21 can be monitored, and the power of the VCSEL 21 can be adjusted according to actual needs.
  • the second optical surface 16b of the filter 16 can be used to reflect part of the first optical signal out of the installation groove 15, and the first optical signal entering the optical fiber 23 can be reduced.
  • the intensity of the optical signal makes the intensity of the first optical signal that enters the optical fiber 23 basically the same every time, which improves the stability of optical fiber communication.
  • the optical fiber 23 can be a multi-mode fiber or a single-mode fiber, and the optical fiber 23 can be a single fiber or an array composed of multiple optical fibers.
  • the optical fiber 23 is an array composed of multiple optical fibers, At this time, there are also multiple fiber lenses 14, and their arrangement is the same as that of multiple optical fibers.
  • the optical fiber lens 13 can be located outside the optical module to form an optical fiber interface for connecting the optical fiber.
  • the optical fiber interface can be an LC/SC interface; the optical fiber lens 13 can also be integrated inside the optical module, that is, the optical module has its own optical fiber interface, for example AOC form.
  • An embodiment of the present application also provides an optical communication device, which includes the optical module described in the foregoing embodiment. Since the optical communication device includes an optical module, the optical communication device also has the same advantages as the optical module. For details, please refer to the relevant description above, which will not be repeated here.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

L'invention concerne un système de couplage optique (10), comprenant un corps principal optique (11) et un élément de conversion de lumière (16) ; le corps principal optique (11) est pourvu d'un orifice de communication bidirectionnel (14), un orifice de réception (12), un orifice de sortie (13) et une rainure de montage (15) ; la rainure de montage (15) est pourvue d'une surface de montage (15a), et la surface de montage (15a) est pourvue d'une rainure (17) ; l'élément de conversion de lumière (16) est situé dans la rainure de montage (17), et une surface de liaison (16a) de l'élément de conversion de lumière (16) est reliée à la surface de montage (15a) autour de la rainure (17), et forme une zone creuse avec la rainure (17) ; l'orifice de communication bidirectionnel (14) est utilisé pour émettre un premier signal optique qui est émis à partir de l'orifice de réception (12) dans le corps principal optique (11) et traverse l'élément de conversion de lumière (16) et la zone creuse, et est utilisé pour entrer un second signal optique dans le corps principal optique (11), le second signal optique traversant la zone creuse et étant émis vers l'élément de conversion de lumière (16) puis est émis par l'orifice de sortie (13) ; la longueur d'onde du premier signal optique est différente de celle du second signal optique. Le système de couplage optique (10) est utilisé dans le domaine de la technologie de communication optique, et empêche des bulles dans une colle optique d'affecter la transmittance et la réflectivité de l'élément de conversion de lumière (16). L'invention concerne en outre un module optique contenant le système de couplage optique (10) ci-dessus et un dispositif de communication optique contenant le module optique.
PCT/CN2020/076008 2020-02-20 2020-02-20 Système de couplage optique, module optique et dispositif de communication optique WO2021163953A1 (fr)

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PCT/CN2020/076008 WO2021163953A1 (fr) 2020-02-20 2020-02-20 Système de couplage optique, module optique et dispositif de communication optique
CN202080091983.8A CN114902102B (zh) 2020-02-20 2020-02-20 光学耦合***、光模块和光通信设备

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CN110456467A (zh) * 2019-09-11 2019-11-15 青岛海信宽带多媒体技术有限公司 一种光模块
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US20110097037A1 (en) * 2008-11-11 2011-04-28 Ultra Communications, Inc. Fiber optic bi-directional coupling lens
CN203705694U (zh) * 2014-02-10 2014-07-09 青岛海信宽带多媒体技术有限公司 单纤双向收发一体光组件
CN204154951U (zh) * 2014-10-10 2015-02-11 武汉宜鹏光电科技有限公司 一种小型光通讯单纤双向器
CN105929491A (zh) * 2015-02-26 2016-09-07 住友电气工业株式会社 与单根光纤通信的双向光学组件及配备该组件的光收发器
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