WO2020057310A1 - Module optique - Google Patents

Module optique Download PDF

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Publication number
WO2020057310A1
WO2020057310A1 PCT/CN2019/101658 CN2019101658W WO2020057310A1 WO 2020057310 A1 WO2020057310 A1 WO 2020057310A1 CN 2019101658 W CN2019101658 W CN 2019101658W WO 2020057310 A1 WO2020057310 A1 WO 2020057310A1
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WO
WIPO (PCT)
Prior art keywords
optical
light
glue
array
optical fiber
Prior art date
Application number
PCT/CN2019/101658
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English (en)
Chinese (zh)
Inventor
刘维伟
唐永正
Original Assignee
青岛海信宽带多媒体技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CN201811103390.XA external-priority patent/CN109143498A/zh
Priority claimed from CN201811103376.XA external-priority patent/CN109143497A/zh
Application filed by 青岛海信宽带多媒体技术有限公司 filed Critical 青岛海信宽带多媒体技术有限公司
Publication of WO2020057310A1 publication Critical patent/WO2020057310A1/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

  • the present application relates to the field of optical communication technologies, and in particular, to an optical module.
  • the integration degree of micro-optical assembly is getting higher and higher, and the optical path system is becoming more and more complicated.
  • the coupling efficiency between the light and the adapter becomes particularly important .
  • a multi-lens coupling optical path system may include a laser, a point-to-point lens, a collimator lens, a focusing lens, and an optical fiber adapter with an isolator.
  • Different solutions may also include some other auxiliary components.
  • the basic principle of optical transmission is: the light emitted by the laser first forms a beam of light with a small divergence angle through the point-to-point lens, and then becomes parallel collimated light through the collimating lens, and then couples into the fiber of the fiber adapter through the focusing lens. In the core.
  • the present application provides an optical module to overcome the problems of high coupling difficulty, long coupling time, and high requirements for the position accuracy of various devices in an optical path system in the prior art.
  • An optical module provided in the first aspect of the present application includes a circuit board, a light transmission component, and a photodetector array disposed on a surface of the circuit board, and a surface of the photodetector array is coated with glue;
  • An end of the light transmission component is an inclined surface
  • the glue is in contact with the light transmission component
  • Light is reflected on the inclined surface, and enters the surface of the photodetector array through the glue.
  • the optical module includes a circuit board, a light transmission component, and a light detector array disposed on the surface of the circuit board.
  • the light transmission component and the light detector array can be deployed on the circuit board, and the light transmission
  • the end of the module is a bevel. This can change the direction of light propagation, so that the light is propagated to the surface of the photodetector array.
  • glue By coating glue on the surface of the photodetector array, and the glue is in contact with the light transmission component, so After the inclined surface of the light transmission component is reflected, it is first incident into the glue.
  • the light transmission efficiency is improved, and the light spots formed on the surface of the photodetector array are reduced.
  • the coupling efficiency of the light and the photodetector array is shortened, the coupling time is shortened, and the position accuracy requirements of each component in the optical path system are reduced.
  • a refractive index of the glue is smaller than a refractive index of the light transmitting component.
  • the absolute value of the difference between the refractive index of the glue and the refractive index of the light transmission component is less than 10%.
  • the absolute value of the difference between the refractive index of the glue and the refractive index of the light transmission component is less than 10%, this reduces the light generated when the light is reflected from the inclined surface of the light transmission component and exits from the lower surface and enters the glue. Loss.
  • the light transmittance of the glue to the received light is greater than 90%.
  • the absolute value of the difference between the thermal expansion coefficient of the glue and the thermal expansion coefficient of the photodetector array is less than 15% ppm / ° C.
  • the optical transmission component is an arrayed waveguide grating
  • the optical module further includes: an optical fiber adapter, an optical fiber, and a coupler; the optical fiber adapter is connected to the arrayed waveguide grating through the optical fiber and the coupler in sequence.
  • the distance between each photodetector in the photodetector array and the array waveguide grating is between 10 and 30 microns.
  • the optical transmission component is an optical fiber array
  • the optical fiber array includes a substrate having a groove on a surface of the substrate, and the optical fibers of the optical fiber array are placed in the groove.
  • the optical transmission component is an optical fiber array
  • the optical fiber array includes a fixed substrate, and the optical fiber array is fixed on a surface of the circuit board through the fixed substrate.
  • the optical module further includes: a sealed housing;
  • the circuit board and the optical fiber array respectively extend into the sealed housing, and the photodetector array is located on a surface of the circuit board inside the sealed housing.
  • a diameter of a light incident surface of each photodetector in the photodetector array is less than 16 microns.
  • the viscosity of the glue is less than 600 centipoise at a temperature of 25 ° C.
  • the optical module further includes: a packaging cover;
  • the packaging cover is fixed on the surface of the circuit board, and the packaging cover covers the photodetector array.
  • the second aspect of the present application further provides an optical module, which includes a circuit board, a light transmission component, and a photodetector array disposed on a surface of the circuit board, and a surface of the photodetector array is coated with glue;
  • the end of the arrayed waveguide grating AWG is an inclined plane
  • the glue is not in contact with the arrayed waveguide grating AWG;
  • Light is reflected on the inclined surface, and after passing through the air and the glue in sequence, it is incident on the surface of the photodetector array.
  • the optical module includes a circuit board, an arrayed waveguide grating AWG, and a photodetector array disposed on the surface of the circuit board.
  • the AWG and the photodetector array can be deployed on the circuit board. It is a bevel, so that the direction of light propagation can be changed, so that the light is propagated to the surface of the photodetector array.
  • the surface of the photodetector array is coated with glue, and the glue is not in contact with the AWG.
  • the refractive index of the glue is greater than the refractive index of air.
  • the refractive index of the air is smaller than the refractive index of the glue, the light incident on the glue is refracted in the glue, and condensing occurs inside the glue.
  • a simple optical path system can be used to improve the coupling efficiency, shorten the coupling time, and reduce the position accuracy requirements of each device in the optical path system.
  • FIG. 1 is an optical path system diagram of a multi-lens light emission sub-module TOSA in the prior art
  • FIG. 2 is a light path system diagram of a light receiving sub-module ROSA in the prior art
  • FIG. 3 is a schematic structural diagram of a first embodiment of an optical module according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a second embodiment of an optical module according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of an arrayed waveguide grating
  • FIG. 6 is a schematic structural diagram of a third embodiment of an optical module according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a fourth embodiment of an optical module according to an embodiment of the present application.
  • the coupling process of light and adapter is mainly applicable to optical modules, and the optical modules mainly include a light transmitting sub-module (TOSA) and a light receiving sub-module (ROSA).
  • the TOSA is mainly used to convert electrical signals into optical signals (that is, electro-optical conversion (E / O conversion), and the corresponding performance indicators are mainly optical power and threshold.
  • the ROSA is mainly used for optical The signal is converted into an electrical signal (that is, optical-electro conversion (O / E conversion), and the corresponding performance indicators mainly include sensitivity and the like.
  • FIG. 1 is an optical path system diagram of a multi-lens optical emission sub-module TOSA in the prior art.
  • the optical path system of the multi-lens light transmitting sub-module TOSA may include a laser 11, a point-to-point lens 12, a collimating lens 13, a focusing lens 14, and an optical fiber adapter 15 with an isolator.
  • some other auxiliary components may also be included, and details are not described herein again.
  • the assembly sequence may be as follows: first, the laser 11 and the point-to-point lens 12 are fixed passively, and then the collimator lens 13 is fixed actively. In order to collimate the optical path, the focusing lens 14 is fixed by an active method, and finally the light is coupled into the optical fiber adapter 15 by an active method.
  • the thickness of the point-to-point lens 12, the collimating lens 13, and the focusing lens 14 is between 0.6 and 1 mm.
  • the collimator lens 13 needs to collimate the light emitted by the laser 11. Therefore, the placement accuracy of the point-to-point lens 12 is high and the optical path is required. After collimating, adjust the positions of the optical fiber adapter 15 and the focusing lens 14 to a proper position to increase the coupling power of light and the adapter. Because the coupling of light and adapter involves multiple lenses such as point-to-point lens 12, collimator lens 13, focusing lens 14 and the adapter, the optical path is complicated, making the coupling of light and adapter difficult, and the time required will be longer. And a slight change will cause a large change in optical power, which will greatly affect the yield of optical modules and other products, and thus affect the output efficiency of optical module products.
  • the light receiving surface of the photodetector surface becomes smaller as the transmission rate increases, that is, the area of the light receiving surface of the photodetector receiving 100G rate light is smaller than the area of the light receiving surface of the photodetector receiving 50G rate light.
  • the light receiving end of the optical module adopts the form of a photodetector array to receive light.
  • the external optical fiber is inserted into the optical port socket of the optical module. Inside the optical module, the optical port socket is connected to the optical fiber array. The array conducts light into the photodetector array.
  • the end of the optical fiber in the optical fiber array forms an inclined plane, and light is reflected at the inclined plane, and the reflected light enters the optical detector array; between the optical fiber array and the optical detector array, the optical detector and the optical fiber have a corresponding relationship.
  • a single fiber transmits a single channel of light, and a single channel corresponds to one (single-mode light) or several (multi-mode light) wavelengths of light.
  • the optical port socket of the optical module guides external light into the optical fiber array, and a single optical fiber in the optical fiber array transmits light of a single channel. The light is reflected at the inclined surface of the optical fiber end, and then is directed to the light receiving surface of the light detector.
  • FIG. 2 is an optical path system diagram of a light receiving sub-module ROSA in the prior art.
  • the optical path system of the light receiving sub-module ROSA may include a fiber adapter 21, an arrayed waveguide grating (AWG) 22, and a detector 23.
  • the ROSA of the light receiving sub-module of different schemes may also include some other auxiliary components, which will not be repeated here. It should be noted that, in the embodiment shown in FIG. 2, one detector 23 is used for description. In practical applications, the ROSA optical path system may include multiple detectors.
  • the basic principle of the corresponding optical path is: a beam of light emitted by the fiber adapter 21 is divided into multiple channels of different wavelengths by the selection of the wavelength by the AWG 22 Light, the multiple channels of light of different wavelengths are coupled one-to-one into the corresponding detectors 23, where the distance from each detector 23 to the AWG 22 is less than 30 ⁇ m.
  • the basic function of the AWG 22 is the multiplexing / separating of wavelengths, which can implement wavelength multiplexing / demultiplexing, interpolation / division multiplexing, wavelength routing, and so on.
  • the AWG 22 can be combined with an optical switch to perform wavelength selection.
  • AWG 22 can also be combined with a multi-wavelength laser to form a multi-wavelength light source.
  • the optical fiber adapter 21 enters the detector 23 after selecting the wavelength of the AWG 22.
  • the optical fiber outside the optical module is inserted into the optical interface of the optical module (the optical fiber adapter is set in the optical interface).
  • the optical interface is connected to the optical fiber array.
  • the optical fiber array transmits multiple channels of light, multiple channels of light, and multiple light detectors.
  • a single detector can receive one light, wherein the distance between the detector and the fiber array is less than 30 ⁇ m.
  • the diameter of the photosensitive surface (area capable of receiving light) of each detector 23 may be 20 ⁇ m.
  • the diameter of the photosensitive surface of detector 23 It is only 16 ⁇ m. In this case, the light entering the photosensitive surface of the detector 23 will be reduced by about 30%, which will cause the sensitivity of the detector 23 to decrease, and the entire transmission chain of the optical path will be affected.
  • the gap between the optical fiber array and the photodetector array is filled with air
  • the refractive index changes and the air is an optically sparse medium.
  • the light in the air diverges to drive the propagation. With the divergence of light, the area of the light spot gradually becomes larger.
  • the light receiving surface of the photodetector is large, ideal light receiving can be achieved.
  • the efficiency of light reception can not meet the requirements of practical use, reflected in low optical power.
  • the receiving end of the optical module needs to select a higher-speed photodetector.
  • the embodiments of the present application address the problems of high coupling difficulty, long coupling time, and high requirements for the position accuracy of each device in the optical path system in the prior art.
  • An optical module is proposed by coating the receiving end of the optical detector array. Coated with glue, the use of a simple optical path system can improve the coupling efficiency, shorten the coupling time, and reduce the position accuracy requirements for each component in the optical path system.
  • the technical solution of the present application will be described in detail through specific embodiments.
  • FIG. 3 is a schematic structural diagram of a first embodiment of an optical module according to an embodiment of the present application.
  • the optical module may include a circuit board 31, a light transmission component 32, and a photodetector array 33 disposed on a surface of the circuit board 31, and the photodetector array The surface of 33 is coated with a glue 34.
  • the end of the light transmission component 32 is an inclined surface, and the glue 34 is in contact with the light transmission component 32.
  • the light entering the light transmission component 32 is reflected on the inclined surface of the light transmission component 32 and enters the surface of the photodetector array 33 through the glue 34.
  • the refractive index of the glue 34 is smaller than the refractive index of the light transmitting component 32.
  • the absolute value of the difference between the refractive index of the glue 34 and the refractive index of the light transmission component 32 is less than 10%.
  • the optical transmission component 32 may be implemented in the form of an arrayed waveguide grating AWG or a fiber array (FA).
  • the specific expression of the optical transmission component 32 may be determined according to actual conditions. I won't repeat them here.
  • the photodetector array 33 provided in the embodiment of the present application may be a plurality of photodetectors bonded together, or there may be a partial gap between the multiple photodetectors.
  • the surface of the photodetector array 33 is coated with glue 34, mainly The surface of the photodetector is coated with glue 34.
  • optical transmission component 32 is implemented in the form of an AWG
  • technical solution of this embodiment can be summarized as follows:
  • the circuit board 31 is used to carry an AWG and a photodetector array 33.
  • a single beam of multiple wavelengths of light from the outside passes into the AWG.
  • the AWG splits the single beam of multiple wavelengths into multiple channels of single beam of single wavelength.
  • the end of the light beam is inclined, and the propagation direction of the multiple single-wavelength and single-wavelength light can be changed, thereby propagating the light toward the surface of the photodetector array 33.
  • the glue 34 is coated on the surface of the photodetector array 33 and is in contact with the AWG. Therefore, after the glue 34 is cured, each photodetector in the photodetector array 33 can be separately It is fixed on the lower surface of the AWG, which not only improves the tightness of the photodetector array 33 and the AWG, but also effectively prevents water vapor and related impurities from contaminating the photodetector array 33 surface and the photosensitive surface of the AWG surface.
  • the life span is shortened, and the multiple single-beam single-wavelength light obtained by the AWG decomposition exits from the lower surface of the AWG and directly enters the glue 34.
  • the glue 34 then enters the surface of the photodetector array 33 to Coupled into the interior of the photodetector array 33.
  • the absolute value of the difference between the refractive index of the glue 34 and the refractive index of the arrayed waveguide grating AWG is less than 10% or it is understood that the refractive index of the glue 34 matches the refractive index of the AWG, that is, the glue 34 is cured.
  • the later properties are closer to the material properties of the AWG. In this way, the better the sealing effect of the glue between the photodetector array 33 and the AWG, therefore, there is no air between the photodetector array 33 and the AWG. At this time, multipath is reduced.
  • a single beam of single-wavelength light enters the glue 34 from the lower surface of the AWG, and then enters the photodetector array 33.
  • the reflection and loss caused by transmission in different media improve the transmission efficiency of light and reduce light detection in light.
  • the size of the light spot formed on the surface of the sensor array 33 improves the coupling efficiency between the light and the photodetector array, shortens the coupling time, and reduces the positional accuracy requirements of each component in the optical path system.
  • optical transmission component 32 is implemented by an optical fiber array
  • technical solution of this embodiment can be summarized as follows:
  • a glue 34 is coated on the surface of the photodetector array 33.
  • the end of the optical fiber array is an inclined surface.
  • the glue 34 is in contact with the optical fiber array.
  • the light entering the optical fiber array is reflected on the inclined surface of the optical fiber array, and enters the surface of the photodetector array 33 through the glue 34.
  • the refractive index of an optical fiber array generally refers to the refractive index of a substrate enclosing the optical fiber, or the refractive index of the optical fiber, or the integrated refractive index of the optical fiber and the substrate.
  • the specific refractive index value of the optical fiber array can be determined according to the actual situation.
  • the refractive index of the glue 34 matches the refractive index of the fiber array.
  • the purpose of the refractive index of the glue to match the refractive index of the fiber array is to make the refractive index of the glue and the refractive index of the fiber array as close as possible.
  • glue The refractive index of is greater than that of air, which has the technical effect of practical use.
  • the glue 34 is coated on the surface of the photodetector array 33 and is in contact with the optical fiber array. Therefore, after the glue 34 is cured, each photodetector in the photodetector array 33 can be It is fixed on the lower surface of the optical fiber array, which not only improves the tightness between the photodetector array 33 and the optical fiber array, but also effectively prevents water vapor and related impurities from contaminating the photodetector array 33 surface and the photosensitive surface of the optical fiber array. The life of the optical fiber array 33 and the optical fiber array are shortened, and light exits from the lower surface of the optical fiber array and directly enters the glue 34. The glue 34 is then incident on the surface of the photodetector array 33 to be coupled into the photodetector array 33. internal.
  • the optical module includes a circuit board, a light transmission component, and a light detector array disposed on the surface of the circuit board.
  • the light transmission component and the light detector array can be deployed on the circuit board, and the light transmission
  • the end of the module is a bevel. This can change the direction of light transmission, so that the light is propagated to the surface of the photodetector array.
  • the surface of the photodetector array is coated with glue, and the glue is in contact with the light transmission component, so that the light is After the inclined surface of the light transmission component is reflected, it first enters the glue, and when the light is incident on the surface of the photodetector array through the glue, it reduces the light generated when the light is reflected from the slope of the AWG and exits from the lower surface and enters the glue. Loss, which improves the transmission efficiency of light, reduces the spot formed by light on the surface of the photodetector array, improves the coupling efficiency between light and the photodetector array, shortens the coupling time, and reduces the Position accuracy requirements.
  • FIG. 4 is a schematic structural diagram of a second embodiment of an optical module according to an embodiment of the present application.
  • the optical module may include a circuit board 31, a light transmission component 32, and a photodetector array 33 disposed on a surface of the circuit board 31.
  • the photodetector array The surface of 33 is coated with a glue 34.
  • the end of the light transmission component 32 is an inclined surface, and the glue is not in contact with the light transmission component 32.
  • the refractive index of the glue 34 is greater than that of air; light is reflected on the inclined surface of the light transmission component 32, passes through the air and the glue 34 in sequence, and then enters the surface of the photodetector array 33.
  • the specific composition of the optical module is the same as the optical module in the embodiment shown in FIG. 3 described above, and the difference between FIG. 4 and FIG. 3 is only that: it is coated on the photodetector array 33
  • the glue 34 on the surface is not in contact with the light transmission module 32. Therefore, after the light entering the light transmission module 32 is reflected on the inclined surface of the light transmission module 32, it first passes through the air and then enters the glue 34, and finally enters the photodetector array. 33 surface.
  • the refractive index of the glue is greater than the refractive index of air, or the refractive index of the glue 34 matches the refractive index of air, so in view of the fact that light enters through the light transmission component 32 during the transmission process
  • the light enters the light-dense medium from the optically sparse medium to a certain degree of refraction principle, which can make the light incident in the glue 34 converge inside the glue 34, thereby reducing
  • the light spot formed on the receiving end surface of the photodetector array 33 is further improved, and the coupling efficiency of light and the photodetector array 33 is improved.
  • a glue 34 is coated on the surface of the photodetector array 33, and the glue 34 is not in contact with the optical fiber array.
  • the outer surface of the glue 34 is spherical, which can converge light, reduce the spot area, and improve light receiving efficiency.
  • the refractive index of the glue is slightly larger than that of air. Based on the effect of refracting and converging light, the reflection damage of light at the interface of different media surfaces is reduced. Specifically, the refractive index of the glue is 2 times that of air. Refractive index range. This is because reflection damage occurs when light passes through materials of different refractive indices, that is, some light is reflected back, leading to a reduction in the forward propagating optical power.
  • the glue when the gap is filled with glue, the glue has a refractive index greater than that of air.
  • Glue with similar refractive index and refractive index of the photodetector reduces the change in refractive index between the light entering the photodetector from the optical fiber, thereby reducing the reflection damage of the light between different refractive index materials and increasing the light entering the light Detector power.
  • the optical module includes a circuit board, a light transmission component, and a light detector array disposed on the surface of the circuit board.
  • the light transmission component and the light detector array can be deployed on the circuit board, and the light transmission
  • the end of the component is a bevel, which can change the direction of light propagation, so that the light is propagated to the surface of the photodetector array.
  • the surface of the photodetector array is coated with glue, and the glue is not in contact with the light transmission component. After the light is reflected on the inclined surface of the light transmission component, it first passes through the air and then enters the glue.
  • the refractive index of air is smaller than the refractive index of the glue, the light incident on the glue is refracted in the glue, and then converges inside the glue. Then, it is incident on the surface of the photodetector array, thereby reducing the light spots formed on the surface of the photodetector array, thereby improving the coupling efficiency of light and the photodetector array.
  • the array waveguide grating, the photodetector array 33, and the glue 34 are briefly described below.
  • FIG. 5 is a schematic structural diagram of an arrayed waveguide grating.
  • the arrayed waveguide grating is produced step by step through the growth and etching processes.
  • the substrate is the basis for the growth and etching of the arrayed waveguide grating. Therefore, the substrate 51 of the arrayed waveguide grating has a large thickness, and the arrayed waveguide grating has a large thickness.
  • the thickness of the grating layer 52 is relatively small, and light passes through the grating layer of the arrayed waveguide grating. Therefore, as a whole, the light does not pass through the center position of the arrayed waveguide grating.
  • the arrayed waveguide grating is used upside down based on the position of FIG. 5 so that the grating layer of the arrayed waveguide grating 33 faces the circuit board 31.
  • the substrate layer faces away from the circuit board 31, and the substrate of the arrayed waveguide grating is far away from the circuit board 31 relative to the grating layer. Therefore, as shown in FIG. 2 to FIG. Surface transmission.
  • an arrayed waveguide grating light propagates along a position close to the lower surface of the arrayed waveguide grating, that is, light does not propagate along a center position of the arrayed waveguide grating, which is different from an optical fiber and a coupler.
  • an optical fiber light travels along the center of the fiber.
  • the optical fiber is divided into an inner core layer and an outer cladding layer, and the light travels along the center of the core layer.
  • the coupler the light also follows the center of the coupler shape body. Location spread.
  • the substrate thickness of the arrayed waveguide grating is much larger than the thickness of the grating layer, and light passes through the grating layer, so the position where the arrayed waveguide grating receives light is located in the entire arrayed waveguide grating.
  • the lower side not the center.
  • the array waveguide grating is positioned closer to the surface of the circuit board 31 and the surface of the photodetector array 33.
  • FIG. 6 is a schematic structural diagram of a third embodiment of an optical module according to an embodiment of the present application.
  • the optical module may further include an optical fiber adapter 61, an optical fiber 62, and a coupler 63.
  • the optical fiber adapter 61 passes the optical fiber 62 and the coupler 63 and the above-mentioned optical transmission component 32 in order. connection.
  • the optical module includes a circuit board 31, an optical fiber adapter 61, an optical fiber 62, a coupler 63, a light transmission component 32, a light detector array 33, and a light detector array 33 coated on a surface of the light detector array 33. glue.
  • the optical transmission component 32 receives a beam of light from the outside, and the external beam of light contains optical signals of multiple wavelengths, the optical transmission component 32 decomposes a beam of multi-wavelength light into multiple single beams and single wavelengths.
  • the coupler 63 realizes the connection between the optical transmission component 32 and the optical fiber 62. Since the optical fiber is a soft material and the optical transmission component 32 is a rigid material, the connection between the optical fiber 62 and the optical transmission component 32 needs to be excessive, so it is used Coupler 63.
  • the coupler 63 may be a capillary.
  • the photodetector array 33 is located on the surface of the circuit board 31, and the light receiving surface / photosensitive surface thereof faces the upper side of the circuit board.
  • a protective cover may be provided above the single-channel multi-wavelength light from the optical fiber.
  • the optical fiber adapter 61 (also known as a flange), also known as an optical fiber connector, is an optical fiber active connector centering connection component. It is the most used optical passive component in optical fiber communication systems. Most optical fibers The adapter is composed of three parts: two fiber optic connectors and a coupler, two fiber optic connectors are installed in the two fiber ends, and the coupler plays a role of aligning the fiber optic connectors.
  • the photodetector array 33 may also be a photodiode detector, a photodiode, or other elements.
  • the specific expression form of the photodetector array 33 can be determined according to the actual situation, and will not be repeated here.
  • the optical module further includes: a package cover
  • the packaging cover is fixed on the surface of the circuit board, and the packaging cover is used for covering the photodetector array.
  • the photodetector array 33 is located on the surface of the circuit board 31, and the light receiving surface / photosensitive surface thereof faces above the circuit board 31.
  • a package may be provided above the photodetector array 33.
  • a cover body which is fixed on the surface of the circuit board and is used for covering the photodetector array.
  • the optical module includes an optical fiber adapter, an optical fiber, a coupler, a circuit board, an arrayed waveguide grating AWG, and a photodetector array, thereby providing an implementation possibility for realizing photoelectric conversion.
  • the optical module in the embodiment of the present application further includes: a sealed housing.
  • the circuit board and the optical fiber array respectively extend into the sealed housing, and the photodetector array is located on the surface of the circuit board inside the sealed housing.
  • FIG. 7 is a schematic structural diagram of a fourth embodiment of an optical module according to an embodiment of the present application.
  • the optical module includes a circuit board 31, a light transmission component 32, a light detector 33, and a sealed case.
  • the sealed case includes an upper case 42 and a lower case 41, and a circuit board. 31 extends into the sealed case, and the upper case 42 and the lower case 41 are located on the upper and lower sides of the circuit board 31, respectively.
  • the gap between the circuit board 31 and the sealed case can be sealed with a sealant.
  • the light transmission assembly 32 projects into a sealed housing.
  • the optical transmission component 32 is an optical fiber array.
  • the optical fiber array includes a substrate 43, and a groove is formed on the substrate 43, and the optical fibers of the optical fiber array are placed in the groove.
  • the optical fiber is a relatively soft material and cannot be fixed directly above the photodetector array, it is necessary to use a hard material to wrap the optical fiber.
  • Fixing the rigid material can fix the optical fiber.
  • the glass fiber or silicon substrate can be used to fix the optical fiber.
  • the surface of the substrate forms a groove. The groove can be V-shaped or U-shaped through the optical fiber.
  • the circuit board can be a flexible circuit board.
  • the optical module also includes a printed circuit board PCB.
  • the flexible circuit board is connected to the printed circuit board.
  • the surface of the printed circuit board PCB is provided with MCU and other chips.
  • the PCB is light.
  • the main circuit board in the module is a flexible circuit board.
  • the optical fiber array includes a fixed substrate, and the optical fiber array is fixed on the surface of the circuit board 31 through the fixed substrate.
  • an optical fiber is held by two substrates, and either of the substrates may be a fixed substrate.
  • the substrate of the optical fiber array may be ground together during the process of grinding the end of the optical fiber into an inclined plane, and the end of the optical fiber array composed of the optical fiber and the substrate may be ground into an inclined plane.
  • the optical fiber is fixed on the circuit board through a fixed substrate, and the end of the optical fiber is suspended above the photodetector.
  • the vertical distance between the optical fiber and the photodetector is limited by this fixing method of the optical fiber array.
  • the diameter of the light incident surface of each of the photodetectors in the photodetector array 33 is less than 16 microns.
  • the diameter of the photosensitive surface of each photodetector in the photodetector array 33 is only 16 ⁇ m or less.
  • the spot formed by the light on the surface of the photodetector is large, the light entering the photodetector will be reduced, resulting in a decrease in the sensitivity of the photodetector array 33. Therefore, in this embodiment, By coating glue on the surface of the photodetector array, the light spot reaching the surface of the photodetector array is reduced, and the coupling efficiency of light and the photodetector array is improved.
  • the distance between each light detector in the light detector array 33 and the light transmission component 32 is between 10-30 micrometers. That is, the distance between the photodetector array 33 and the light transmission component 32 is too small. It is not possible to converge the light emitted from the lower surface of the photodetector array 33 by placing optical devices such as a lens between the two. The purpose of reducing the light spot reaching the surface of the photodetector array 33 is.
  • the surface of the photodetector array 33 is coated with glue whose absolute value of the difference between the refractive index and the refractive index of the light transmission component 32 is less than 10%, that is, the refraction of the photodetector array 33.
  • the rate is matched with the refractive index of the glue 34, and the convergence of the glue 34 can also reduce the light spot reaching the surface of the photodetector array 33, thereby improving the coupling efficiency of light and the photodetector array 33.
  • the light transmittance of the glue 34 to the received light is greater than 90%.
  • the glue 34 since the glue 34 has different light transmittances for different wavelengths of light, in order to meet the requirements of light transmittance, the glue coated on the surface of each light detector in the light detector array 34 needs to have a correspondence relationship with the wavelength of light incident on the surface of the photodetector.
  • the glue 34 is coated on the surface of each photodetector in the photodetector array, the light emitted from the light transmission component 32 needs to pass through the glue 34 to reach the surface of each photodetector. Therefore, in this embodiment, The glue 34 needs to have light transmission properties.
  • the transmittance of the glue 34 to the received light is greater than 90%.
  • the transmittance of the glue to the received light may be greater than 95%.
  • the light transmittance of the glue is greater than 90% (or 95%), so that when the glue is fixed or the wavelength of light is fixed, the corresponding light wavelength or glue is selected to increase the light intensity reaching the surface of each photodetector in the photodetector array 33.
  • the glue 34 is cured to the surface of each photodetector in the photodetector array 33, it can also be used to improve the sealability of the surface of the photodetector array 33. .
  • the glue is firmly adhered to the surface of the photodetector array, so that the surface of the photodetector array is not Contact with the outside air improves the tightness of the photodetector array, so that water vapor and related impurities can be prevented from contacting the surface of the photodetector array, thereby preventing water vapor and related impurities from contaminating the optical devices on the photosensitive surface of the photodetector array.
  • the thermal expansion coefficient of the glue 34 is close to that of the photodetector array 33 to prevent the glue from falling off the surface of the photodetector.
  • the absolute value of the difference between the thermal expansion coefficient of the glue 34 and the thermal expansion coefficient of the photodetector array 33 is less than 15% ppm / ° C.
  • ppm / ° C means one millionth per degree Celsius, that is, ppm / ° C is a measure of changes in material properties caused by changes in temperature.
  • thermodynamic properties refer to changes in pressure P, volume V, temperature T, composition, and other thermodynamic functions when the substance is in an equilibrium state. Therefore, in this embodiment, the glue 34 included in the optical module also has certain characteristics such as a thermal expansion coefficient.
  • thermodynamic characteristics such as the thermal expansion coefficient of the glue 34 need to be as consistent as possible with the thermodynamic characteristics such as the thermal expansion coefficient of the photodetector array 33, that is, the closer the performance of the two, the better. This is because The glue 34 coated on the surface of the photodetector array 33 will generate stress when it is cured. If the thermal expansion coefficients of the two are inconsistent or not close, when the optical module product is manufactured, cracks and peeling will occur during actual use. , Which further affects the quality of light transmission.
  • the viscosity of the glue 34 is lower than 600 ripes (cp).
  • the glue 34 also needs to meet the characteristics of low viscosity, for example, at room temperature, that is, when the temperature is 25 ° C., it is lower than 600 ripes (cp). This is because the low viscosity of the glue 34 can indicate that the glue 34 has good fluidity. In this way, when the glue 34 is coated on the surface of the photodetector array 33, the surface flatness of the photodetector array 33 can be guaranteed to meet the requirements. When light is incident on the surface of the glue 34, the probability of diffuse reflection of the light can be reduced, and the coupling efficiency between the light and the photodetector array 33 can be improved. The problem is that the coupling efficiency of the sensor array 33 is low, and when the light detector array 33 receives optical signals in multiple channels, the interference between the light and the AWG or related components due to the uneven surface of the glue 34, resulting in The problem of uneven optical power.
  • low viscosity for example, at room temperature, that is, when the temperature is 25 ° C., it is
  • the glue 34 may be an optical waveguide adhesive.
  • the glue may be, for example, UV glue or optical waveguide adhesive.
  • the optical waveguide adhesive has the characteristics of precise refractive index control, wet bonding reliability, and ultraviolet curing.
  • the curing conditions for curing the optical waveguide adhesive to the surface of the photodetector array 33 may be: UV light source: 300-400nm output (metal lamp, mercury lamp, etc.), irradiation intensity: 10mW / cm2 (control The wavelength of light is 365 nm), and the irradiation time: more than 10 minutes.
  • stepwise curing can be adopted according to actual needs, such as: the first step: 10mw / cm2, 90 seconds; the second step: 20mW / cm2, 90 seconds; the third step: 40mW, 90 seconds.
  • the total energy absorbed by the optical waveguide adhesive is 6300mJ, which exceeds the curing energy of 6000mJ required by the optical waveguide adhesive.
  • the performance of the optical waveguide adhesive can be more stable if it can be heated under the following conditions.
  • the heating condition is that the heating is controlled at 50 to 60 ° C. In between, the heating time is 0.5 to 1 hour. This is because the heat treatment according to the heating conditions described above can release the stress of the optical waveguide adhesive. And after heating, it needs 2 °C / minute to cool down naturally. Do not remove the device directly from the oven after finishing.
  • this optical waveguide adhesive is an anaerobic adhesive, and the part exposed to the air will not be cured, that is, a layer of liquid on the surface will not be cured, but as long as it absorbs more than 6000mJ of energy, the adhesive The area where the layer is bonded to the device is completely cured.
  • the optical waveguide adhesive should avoid direct light and high temperature storage, and should not be close to fire and other heat sources. In general, it is recommended to store it in a dry box because the performance of the optical waveguide adhesive will be reduced after it absorbs moisture.
  • the term "plurality” herein refers to two or more.
  • the term “and / or” in this document is only a kind of association relationship describing related objects, which means that there can be three kinds of relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and exists alone B these three cases.
  • the character "/" in this article generally indicates that the related objects are an "or” relationship; in the formula, the character "/" indicates that the related objects are a "divide” relationship.
  • the size of the sequence numbers of the above processes does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not deal with the implementation of this application.
  • the implementation process of the example constitutes any limitation.

Landscapes

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

Abstract

Module optique, comprenant : une carte de circuit imprimé (31), un module de transmission optique (32), et un réseau de détecteurs optiques (33) disposé sur la surface de la carte de circuit imprimé (31). De la colle (34) est étalée sur la surface du réseau de détecteurs optiques (33) ; dans un cas, une extrémité arrière du module de transmission optique (32) est une pente, la colle (34) est en contact avec le module de transmission optique (32), et la lumière est réfléchie sur la pente du module de transmission optique (32), et est émise dans la surface du réseau de détecteurs optiques (33) au moyen de la colle (34) ; dans l'autre cas, l'extrémité arrière du module de transmission optique (32) est la pente, la colle (34) n'est pas en contact avec le module de transmission optique (32), et la lumière est réfléchie sur la pente, et émise dans la surface du réseau de détecteurs optiques (33) après passage séquentiel de l'air et de la colle (34). En étalant la colle (34) sur la surface du réseau de détecteurs optiques (33), l'efficacité de couplage peut être améliorée et une durée de couplage est raccourcie en utilisant un système de trajet optique simple, et une exigence de précision de position pour des dispositifs dans le système de trajet optique est réduite.
PCT/CN2019/101658 2018-09-20 2019-08-20 Module optique WO2020057310A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201811103390.XA CN109143498A (zh) 2018-09-20 2018-09-20 光模块
CN201811103390.X 2018-09-20
CN201811103376.XA CN109143497A (zh) 2018-09-20 2018-09-20 一种光模块
CN201811103376.X 2018-09-20

Publications (1)

Publication Number Publication Date
WO2020057310A1 true WO2020057310A1 (fr) 2020-03-26

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Country Link
WO (1) WO2020057310A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7058266B2 (en) * 2003-08-28 2006-06-06 Sony Corporation Optical waveguide module
CN105278056A (zh) * 2015-11-06 2016-01-27 武汉电信器件有限公司 一种波分复用/解复用光组件
CN205427247U (zh) * 2015-12-23 2016-08-03 福州高意通讯有限公司 一种用于多路并行传输的光收发组件
CN106646781A (zh) * 2017-01-13 2017-05-10 深圳市万和科技股份有限公司 高速率光电接收接口及其制作方法
CN107991743A (zh) * 2018-01-11 2018-05-04 绍兴柯芯光电技术有限公司 一种集成plc平面波导型器件的光收发模块
CN109143498A (zh) * 2018-09-20 2019-01-04 青岛海信宽带多媒体技术有限公司 光模块
CN109143497A (zh) * 2018-09-20 2019-01-04 青岛海信宽带多媒体技术有限公司 一种光模块

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7058266B2 (en) * 2003-08-28 2006-06-06 Sony Corporation Optical waveguide module
CN105278056A (zh) * 2015-11-06 2016-01-27 武汉电信器件有限公司 一种波分复用/解复用光组件
CN205427247U (zh) * 2015-12-23 2016-08-03 福州高意通讯有限公司 一种用于多路并行传输的光收发组件
CN106646781A (zh) * 2017-01-13 2017-05-10 深圳市万和科技股份有限公司 高速率光电接收接口及其制作方法
CN107991743A (zh) * 2018-01-11 2018-05-04 绍兴柯芯光电技术有限公司 一种集成plc平面波导型器件的光收发模块
CN109143498A (zh) * 2018-09-20 2019-01-04 青岛海信宽带多媒体技术有限公司 光模块
CN109143497A (zh) * 2018-09-20 2019-01-04 青岛海信宽带多媒体技术有限公司 一种光模块

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