Patent Publication Number: US-2023152540-A1

Title: Optical fiber circuit board assembly and optical-electrical hybrid circuit board

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation-application of International (PCT) Patent Application No. PCT/CN2020/142441, filed on Dec. 31, 2020, which claims the priority of Chinese patent application No. 202010889482.6, Aug. 28, 2020, and the entire contents of which are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of circuit boards, and in particular to an optical fiber circuit board assembly and an optical-electrical hybrid circuit board. 
     BACKGROUND 
     Electrical interconnection refers to taking a metal line (generally a copper line) to achieve signal connection between a circuit board and a chip. Optical interconnection refers to taking a light-conducting medium (an optical fiber, an optical waveguide, and so on) to achieve signal connection between the circuit board and the chip. 
     Optical interconnection and electrical interconnection may be combined. However, in the art, the number of optical fibers for optical interconnections may be high, and the optical fibers may be disorganized and may be assembled difficultly. 
     SUMMARY OF THE DISCLOSURE 
     The present disclosure provides an optical fiber circuit board assembly and an optical-electrical hybrid circuit board to solve the technical problem that the optical interconnection and the electrical interconnection may be assembled difficultly. 
     In a first aspect, an optical fiber circuit board assembly is provided and includes: a substrate, including a substrate body, wherein the substrate body at least defines a first opening; a plurality of optical fiber units, arranged on the substrate, wherein an end of each of the plurality of optical fiber units extends to reach the first opening and is configured to couple with one optical element, and the other end of each of the plurality of optical fiber units extends to an outside of the substrate, wherein the optical element is a photoelectric conversion element. 
     In a second aspect, an optical fiber circuit board assembly is provided and includes: a substrate, including a substrate body, wherein the substrate body at least defines a first opening; a plurality of optical fiber units, arranged on the substrate, wherein an end of each of the plurality of optical fiber units extends to reach the first opening and is configured to couple with one optical element, and the other end of each of the plurality of optical fiber units extends to an outside of the substrate. 
     In a third aspect, an optical-electrical hybrid circuit board is provided and includes the optical fiber circuit board assembly as described in the above; a printed circuit board, laminated on and spaced apart from the optical fiber circuit board assembly; a first electronic element, arranged on the printed circuit board and arranged at a position corresponding to the first opening; and the plurality of optical elements, arranged on the printed circuit board and surrounding an outside of the first electronic element, wherein the plurality of optical elements are coupled to the first electronic element through the printed circuit board. 
     According the resent disclosure, a substrate body of the fiber optic circuit board assembly at least defines a first opening. An end of each of a plurality of optical fiber units extends to reach the first opening. In this way, the chip, the optical device coupled to the optical fiber units may be arranged inside the first opening. Further, the optical fiber units are integrated in the substrate, such that the optical fiber units may be well organized. In addition, the end of each optical fiber unit is fixed on an inside of the first opening, an order of the plurality of optical fiber units and a position of each optical fiber unit are fixed. In this way, the plurality of optical devices may not be repositioned the connected one by one, such that the optical interconnection and the electrical interconnection may be assembled simply, and an efficiency of assembling is greatly improved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to illustrate technical solutions in embodiments of the present disclosure more clearly, the accompanying drawings used in the description of the embodiments is briefly described below. Apparently, the following drawings show only some of the embodiments of the present disclosure, and any ordinary skilled person in the art may obtain other drawings based on the following drawings without any creative work. 
         FIG.  1    is a structural schematic view of an optical fiber circuit board assembly according to an embodiment of the present disclosure. 
         FIG.  2    is a structural schematic view of an optical fiber circuit board assembly according to another embodiment of the present disclosure. 
         FIG.  3    is a structural schematic view of a part of the optical fiber circuit board assembly according to the another embodiment of the present disclosure. 
         FIG.  4    is a structural schematic view of an optical fiber circuit board assembly according to still another embodiment of the present disclosure. 
         FIG.  5    is a structural schematic view of an optical-electrical hybrid circuit board according to a first embodiment of the present disclosure. 
         FIG.  6    is another structural schematic view of the optical-electrical hybrid circuit board according to the first embodiment of the present disclosure. 
         FIG.  7    is a structural schematic view of an optical-electrical hybrid circuit board according to a second embodiment of the present disclosure. 
         FIG.  8    is another structural schematic view of the optical-electrical hybrid circuit board according to the second embodiment of the present disclosure. 
         FIG.  9    is a structural schematic view of an optical-electrical hybrid circuit board according to a third embodiment of the present disclosure. 
         FIG.  10    is a structural schematic view of a substrate body of an optical fiber circuit board assembly according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Technical solutions in the embodiments of the present disclosure will be clearly and completely described below by referring to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments show only a part of, but not all of, the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by any ordinary skilled person in the art without creative work shall fall within the scope of the present disclosure. 
     As shown in  FIG.  1   , in the present embodiment, the optical fiber circuit board assembly  10  may include a circuit board that transmits only optical signals or may include a circuit board that transmits a mixed signal including the optical signals. 
     The optical fiber circuit board assembly  10  includes a substrate  11  and a plurality of optical fiber units  12 . The substrate  11  includes a substrate body  111  at least defining a first opening  101 . The plurality of optical fiber units  12  are arranged on the substrate  11 . An end of each of the plurality of optical fiber units  12  extends to the first opening  101 . The plurality of optical fiber units  12  are coupled to a plurality of optical elements  20 . The other end of each of the plurality of optical fiber units  12  extends to an outside of the substrate  11 . 
     In detail, a graphic transferring process may be applied in the present embodiment to define the first opening  101  at a central region or an edge region of the substrate body  111 , i.e., a part of the substrate body  111  located at the central region or the edge region are removed. In this way, in a subsequent processing, electronic elements and the optical elements  20  may be arranged inside the first opening  101 . 
     The optical fiber units  12  are arranged in the substrate  11  in a certain manner. All of the plurality of optical fiber units  12  may be arranged in a same manner or in different manners. Each optical fiber unit  12  includes at least one optical fiber, specifically includes one or more optical fibers, one or more groups of optical fibers, and so on. The number of fibers in each group of fibers may be determined based on actual requirements. For example, the number of fibers in each group of fibers may be determined based on a type of a to-be-connected connector, such as determined as 1, 4, 8, 12, 24, and so on. The number of groups of fibers may be determined based on requirements and is not limited herein. 
     Each optical fiber in the optical fiber unit  12  may be either a high temperature optical fiber or a common optical fiber. The difference between the high temperature optical fiber and the common optical fiber is that a coating layer on a surface of the high temperature optical fiber is made of material resistant to the high temperature, allowing the high temperature optical fiber to be applicable at the high temperature and harsh environments. By contrast, although a coating layer is arranged on a surface of the common optical fiber, the coating layer may lose a protective effect under the high temperature, such that the optical fiber may be easily damaged. A designer may configure the high temperature optical fiber or the common optical fiber to be the optical fiber unit  12 , based on an application scenario of the optical fiber circuit board assembly  10 . For example, when the optical fiber circuit board assembly  10  is required to operate at a temperature higher than 100° C. and to be bent repetitively, the high temperature optical fiber may be configured to serve as the optical fiber unit  12 . To be noted that, by configuring the high temperature optical fiber to be the optical fiber unit  12 , an operating temperature of the optical fiber circuit board assembly  10  may be broadened, and the optical fiber circuit board assembly  10  may be processed in a laminated manner, such that a method of processing the optical fiber board assembly  10  may be diversified. 
     According to the present disclosure, the substrate body of the optical fiber circuit board assembly in the present disclosure at least defines the first opening. An end of each of the plurality of optical fiber units extends to the first opening. In this way, the chip and the optical elements coupled to the optical fiber units may be arranged inside the first opening. The optical fiber units are integrated in the substrate, such that the optical fiber units may not be disorganized. In addition, the end of each of the plurality of optical fiber units is fixed to the inside of the first opening. Further, the order and positions of the plurality of optical fiber units are fixed. The plurality of optical fiber units may be repositioned the connected one by one, such that the optical interconnection and the electrical interconnection may be assembled simply, and an efficiency of assembling may be increased significantly. 
     As shown in  FIG.  1   , in an embodiment, the substrate  11  further defines a first fiber outlet  112 . A plurality of first fiber outlets  112  are defined in an inside of the first opening  101  of the substrate body  111  and protruding toward a center of the first opening  101 . The plurality of optical fiber units  12  are embedded in the substrate  11 . Each of the plurality of optical fiber units  12  extends out from one of the plurality of first fiber outlets  112  to reach the first opening. In other embodiments, an outer edge of each of the plurality of first fiber outlets  112  is aligned with an inner edge of the first opening  101 . 
     To be noted that, for each optical fiber, a length of the optical fiber unit  12  is greater than a length of the substrate  11  in an extension direction of the optical fiber, such that the optical fiber unit  12  may be connected to an optical connector. Furthermore, since the plurality of first fiber outlets  112  are spaced apart from each other. Therefore, each first fiber outlet  112  may be bent based on actual needs, such that the plurality of first fiber outlets  112  may have different outlet directions. 
     Further, the optical fiber circuit board assembly  10  includes a first fiber interface  14 . An end of the optical fiber unit  12  extends out from the first fiber outlet to reach the inside of the first opening  101  and to connect to the first fiber interface  14 . The first fiber interface  14  is configured to connect to the optical element  20 . 
     The first fiber interface  14  may include the optical connector and the optical fiber unit  12  extending from the first fiber outlet. The optical connector is arranged with a positioning structure. Specifically, the positioning structure may be received in an inner cavity of the optical connector. The optical connector may be configured to receive the optical fiber unit  12  extending from the first fiber outlet in the optical fiber circuit board assembly  10  and to position the optical fiber unit  12  by the positioning structure. 
     Specifically, the first optical interface  14  may include a single-line optical connector and/or a multi-line optical connector and an optical fiber unit  12  extending from the first fiber outlet. The single-line optical connector is arranged with a positioning structure to position one line of optical fiber unit  12  and to receive and position one line of optical fiber unit  12  extending from the substrate  11 . The multi-line optical connector is arranged with a positioning structure to position a plurality of lines of optical fiber units  12  and to receive and position the plurality of lines of optical fiber units  12  extending from the substrate  11 . 
     While manufacturing the substrate, regardless of the single-line optical connector or the multi-line optical connector, corresponding optical fiber units  12  need to be inserted into the inner cavity of the optical connector, and subsequently, the optical fibers may be fixed by glue. Further, excess optical fibers may be removed, and the fixed optical fibers may be grounded and polished. In this way, the first fiber interface  14  meeting requirements may be obtained. 
     As shown in  FIG.  2    and  FIG.  3   , in an embodiment, the plurality of first fiber outlets  112  are spaced apart from each other and are located on at least half of an inner side of the first opening  101 . Further, the plurality of first fiber outlets  112  may be distributed to enclose or semi-enclose the entire inner side. 
     Specifically, the first opening  101  may be quadrangular. The plurality of first fiber outlets  112  are spaced apart from each other and are located on two inner edges, three inner edges, or four inner edges of the first opening  101 . When the plurality of first fiber outlets  112  are spaced apart from each other and are located on the four inner edges of the first opening  101 , the plurality of first fiber outlets  112  surrounds the inner side of the first opening  101 . 
     In the art, the optical fiber circuit board is fixed to a surface or a substrate of the optical fiber circuit board by an adhesive. However, due to a signal line between the optical element and the first electronic element being excessively long, the chip, when operating, may be electromagnetically interfered by an electromagnetic environment surrounding the chip, such that it may be difficult to ensure the chip to operate normally. Compared to the related art, the optical elements in the present disclosure are arranged to surround an outside of the first electronic element, allowing the signal line between the optical element and the first electronic element to be minimized, and parallel wires may be avoided. In this way, shortcomings in the art caused by the signal line between the optical element and the first electronic element being excessively long may be overcome. 
     The first opening  101  may be circular or elliptical. The plurality of first fiber outlets  112  are spaced apart from each other and may occupy a half of, three fourths of or the entirety of an inner circumference of the first opening  101 . When the plurality of first fiber openings  112  are spaced apart from each other and are distributed on the entire inner circumference of the first opening  101 , the plurality of first fiber outlets  112  surround the inner side of the first opening  101 . 
     In an embodiment, a distance between an end of one first fiber outlet  112  and a center of the first opening  101  may be different from a distance between an end of another first fiber outlet  112  adjacent to the one first fiber outlet  112  and a center of the first opening  101 . A distance between the ends of the two adjacent first fiber outlets  112 may be at least greater than or equal to a size of the optical element  20 . 
     Specifically, the distance between the ends of adjacent first fiber outlets  112  is at least greater than or equal to the size of the optical element  20 , such that, in subsequent processing, there may be enough space to receive two optical elements  20  which are connected to the two adjacent first fiber interfaces  14 , respectively, and the two optical elements  20  may be spaced apart from each other for heat dissipation. In some embodiments, the distance between the ends of the adjacent first fiber outlets  112  is at least greater than or equal to a diagonal distance of the optical element  20 . 
     In an embodiment, the plurality of first fiber outlets  112  are classified into at least two groups based on distances from the center of the first opening  101  to the end of each of the plurality of first fiber outlets  112 , and the two groups of first fiber outlets  112  are alternately arranged. 
     Specifically, the two groups of first fiber outlets  112  may be arranged in a semi-annular array, in a symmetrical array, or in a double-annular array. In this way, the first fiber interfaces  14  may be arranged symmetrically or in the double-annular array, and the optical elements  20  coupled to the first fiber interfaces  14  may be arranged symmetrically or in the double-annular array, such that a distribution density of the optical elements  20  may be increased, and an integrity of the circuit board may be increased. 
     As shown in  FIG.  4   , in an embodiment, the optical fiber circuit board assembly  10  includes at least one second fiber interface  15 . The substrate  11  further includes at least one second fiber outlet  113 . A plurality of second fiber outlets  113  are protruding outwardly from the substrate  11 . In some embodiments, the number of the at least one second fiber outlet  113  is more than one, and the number of the at least one second fiber interface  15  is more than one. The plurality of optical fiber units  12  are embedded in the substrate  11 , and the optical fiber units  12  extend out from the more than one second outlets  113  and are connected to the more than one second fiber interfaces  15 . 
     In an embodiment, the plurality of second fiber outlets  113  are spaced apart from each other and are all arranged on one side of the substrate  11 . Specifically, outer edges of the second fiber outlets  113  may be aligned with an outer side of the substrate  11 . 
     The second fiber interface  15  may include an optical connector and an optical fiber unit  12  extending from the second fiber outlet. The optical connector is arranged with a positioning structure. The positioning structure may be received in an inner cavity of the optical connector. The optical connector may be configured to receive the optical fiber unit  12  extending from the second fiber outlet in the optical fiber circuit board assembly  10  and to position the optical fiber unit  12  by taking the positioning structure. 
     Specifically, the second optical interface  15  may include a single-line optical connector and/or a multi-line optical connector and the optical fiber unit  12  extending from the second fiber outlet. The single-line optical connector is arranged with a positioning structure to position one line of optical fiber unit  12  and to receive and position one line of optical fiber unit  12  extending from the substrate  11 . The multi-line optical connector is arranged with a positioning structure to position a plurality of lines of optical fiber units  12  and to receive and position the plurality of lines of optical fiber units  12  extending from the substrate  11 . 
     While manufacturing the substrate, regardless of the single-line optical connector or the multi-line optical connector, corresponding optical fiber units  12  need to be inserted into the inner cavity of the optical connector, and subsequently, the optical fibers may be fixed by glue. Further, excess optical fibers may be removed, and the fixed optical fibers may be grounded and polished. In this way, the second fiber interface  15  meeting requirements may be obtained. 
     As shown in  FIG.  10   , in some embodiments, the substrate body  111  includes: a first film layer  1111 , a second film layer  1112 , and a binding layer  1113 . The first film layer  1111  and the second film layer  1112  are laminated on and spaced apart from each other. At least some of the plurality of optical fiber units  12  are disposed between the first film layer  1111  and the second film layer  1112 . The binding layer  1113  is received in the remaining space between the first film layer  1111  and the second film layer  1112  other than a space occupied by the some of the plurality of optical fiber units  12 , such that the some of the plurality of optical fiber units  12  are fixed relative to the first film layer  1111 . 
     In an embodiment, the first film layer  1111  is made of flexible material, and the second film layer  1112  and the binding layer  1113  are made of thermosetting or thermoplastic material. The binding layer  1113  includes two adhesive layers  1114  that are laminated with each other. At least some of the plurality of optical fiber units  12  are disposed between the two adhesive layers  1114  or arranged inside one of the two adhesive layers  1114 . 
     In another embodiment, the first film layer  1111  and the second film layer  1112  may be made of the flexible material. The binding layer  1113  includes two adhesive layers  1114  that are laminated with each other. At least some of the plurality of optical fiber units  12  are disposed between the two adhesive layers  1114  or arranged inside one of the two adhesive layers  1114 . Each of the two adhesive layers  1114  is made of the thermosetting material or the thermoplastic material. 
     Specifically, the flexible material may be flexible composite material, such as polyimide, polyethylene terephthalate, polydimethylsiloxane, and so on. The first film layer  1111  is made of the flexible material, such that a flexible substrate  11  may be obtained and may be able to withstand repetitive bending, allowing the flexible substrate  11  to be arranged at a desired position. fA thickness of the first film layer  1111  may be not greater than 100 μm, such as in a range of 20 μm-100 μm, specifically such as 20 μm, 25 μm, 45 μm, 65 μm, 85 μm, 100 μm, and so on, which will not be limited herein. 
     The binding layer  1113  is disposed between the first film layer  1111  and the second film layer  1112  adjacent to the first film layer  1111 , such that the first film layer  1111  and the second film layer  1112  may be connected with each other through the binding layer  1113 . A corresponding one of the plurality of optical fiber units  12  is fixed between the first film layer  1111  and the second film layer  1112  by the binding layer  1113 . Further, the binding layer  1113  is received in the remaining space between the first film layer  1111  and the second film layer  1112  other than the corresponding optical fiber unit  12 . 
     To be noted that, the binding layer  1113 , when being excessively thin, may not be able to fix the optical fibers; and the binding layer  1113 , when being excessively thick, may not be able to maintain flexibility of the substrate  11 . The thickness in this context refers to a thickness of the binding layer  1113  in a direction perpendicular to a plate surface of the first film layer  1111  and the second film layer  1112 . In the present embodiment, a thickness of a thinnest region of the binding layer  1113  between the first film layers  1111  and the second film layer  1112  adjacent to the first film layers  1111  is greater than one-tenth of a diameter of the optical fiber unit  12  and is less than 10 times the diameter of the optical fiber unit  12 , or greater than a half of the diameter of the optical fiber unit  12  and less than two times of the diameter of the optical fiber unit  12 . For example, the thickness of the thinnest region of the binding layer  1113  between the first film layer  1111  and the second film layer  1112  adjacent to the first film layers  1111  is one-fifth, one-half, one time, two times, five times, etc., of the diameter of the optical fiber, which may not be limited herein. 
     Specifically, the thickness of the binding layer  1113  is not less than 50 μm, and may be 50 μm, 60 μm, 70 μm, and so on. When the binding layer  1113  is arranged, an anti-peeling strength between the first film layer  1111  and the second film layer  1112  adjacent to the first film layer  1111  is not less than 15 N/cm 3 . 
     Specifically, in an application scenario, the adhesive layer  1114  may be solid and flexible in a first temperature range and/or a first pressure range, and may have mobility in a second temperature range and/or a second pressure range. Any temperature in the first temperature range is not greater than any temperature in the second temperature range. Specifically, the binding layer  1114  may be solid and flexible at or near an ambient temperature and at or near the atmospheric pressure. When the binding layer  1114  is heated to reach a certain temperature and/or when a certain pressure is applied to the binding layer  1114 , the binding layer  1114  has certain mobility. Specifically, the adhesive layer  1114  may be made of the thermoplastic material or the thermosetting material. 
     The material of the binding layer  1114  may be determined depending on actual environments in which the optical fiber circuit board assembly  10  is used. Specifically, when the optical fiber unit  12  is to be used at a high temperature, as described above, the optical fiber of the optical fiber unit  12  may be the high temperature fiber, and the bonding layer  1114  may be made of at least one of an epoxy resin system, an acrylic system, and a silicone system. When the optical fiber unit  12  is to be used at an ambient environment, as described above, the optical fiber of the optical fiber unit  12  may be the common optical fiber, and the binding layer  1114  may be made of at least one of an acrylic system and a silicone system. 
     When the adhesive layer  1114  is made of the above material and when the substrate  11  is heated and/or pressurized, the adhesive layer  1114  may flow and wrap around a periphery of the optical fiber unit  12  and may fill the space between the first film layer  1111  and the second film layer  1112  adjacent to the first film layer  1111  other than a space occupied by the optical fiber, such that the optical fiber may be fixed more firmly. In this way, the optical fibers, when being used for a long period of time, may not be loosened and displaced due to being arranged unfirmly, and reliability of the substrate  11  and the optical fiber circuit board assembly  10  may be improved. 
     As shown in  FIGS.  5  to  8   , in the present embodiment, the optical-electrical hybrid circuit board  100  includes: an optical fiber circuit board assembly  10 , a printed circuit board  30 , a first electronic element  40 , and a plurality of optical elements  20 . 
     The printed circuit board  30  is laminated on and spaced apart from the optical fiber circuit board assembly  10 . The first electronic element  40  and the plurality of optical elements  20  are arranged on the printed circuit board  30 . The first electronic element  40  is arranged at a position corresponding to the first opening  101 . The plurality of optical elements  20  surrounds an outside the first electronic element  40 . The optical elements  20  are coupled to the first electronic element  40  through the printed circuit board  30 . 
     To be noted that the optical fiber circuit board assembly  10  in the present embodiment is the same as the optical fiber circuit board assembly  10  in the above mentioned embodiments of the present disclosure. Details of the optical fiber circuit board assembly  10  may refer to the above mentioned embodiments and will not be repeated here. 
     The first optical fiber interface  14  is configured to connect the optical fiber unit  12  to the optical element  20  for transmitting optical signals. The optical element  20  is specifically an optical energy converter or an optical transmission medium. Further, the optical energy converter may be a photoelectric conversion element. The first electronic element  40  may specifically be a chip, such as a router chip. 
     The optical element  20  includes an optical port (not shown). The optical port is configured to connect to the first fiber interface  14  for transmitting the optical signals. An angle of the optical port when being connected to the first fiber interface  14  is adjustable, such that the optical port of the optical element  20  may be facing towards an access direction of the first optical fiber unit. For example, when the optical fiber unit  12  is accessed from a left side of the optical-electrical hybrid circuit board  100 , the optical port of the optical element  20  may be arranged to face towards the access direction of the optical fiber unit  12 . 
     For the optical fiber circuit board in the art, the optical fiber is fixed to the surface or the substrate of the optical fiber circuit board by an adhesive. However, due to the signal line between the optical element and the first electronic element being excessively long, the chip, when being operating, may be electromagnetically interfered by the surrounding electromagnetic environment, and it may be difficult to ensure the chip to operate normally. In contrast to the prior art, in the present disclosure, the optical elements are surrounding the outside of the first electronic element, such that the signal line between the optical element and the first electronic element may be minimized, and parallel wires may be avoided. In this way, shortcomings in the art caused by the signal line between the optical element and the first electronic element being excessively long may be overcome. 
     In an embodiment, a support  60  is disposed between the printed circuit board  30  and the optical fiber circuit board assembly  10 . Specifically, a mounting hole (not shown) may be defined in each of the printed circuit board  30  and the optical fiber circuit board assembly  10 . In this case, the support  60  may be a screw, a rivet, a pin, and so on. The support  60  may be inserted into the mounting hole to secure the printed circuit board  30  to the optical fiber circuit board assembly  10 . In this way, the printed circuit board  30  may be fixed to the optical fiber circuit board assembly  10  more firmly, and the printed circuit board  30  and the optical fiber circuit board assembly  10  may be detached apart from each other more easily. 
     In an embodiment, the plurality of optical elements  20  that are connected to the plurality of first fiber interfaces  14  are spaced apart from each other, and are distributed in a semi-enclosed or enclosed pattern. Further, the plurality of optical elements  20  are arranged in a single-annular array or in a double-annular array to increase the distribution density of the optical elements  20  and to increase the integrity of the optical-electrical hybrid circuit board  100 . 
     As shown in  FIG.  4   , in an embodiment, the substrate body  11  further defines a second opening  102 , and the second opening  102  is spaced apart from the first opening  101 . 
     The optical-electrical hybrid circuit board  100  further includes a second electronic element  50 . The second electronic element  50  is arranged on the printed circuit board  30 . The second electronic element  50  is arranged at a position corresponding to the second opening  102  of the optical fiber circuit board assembly  10 . The second opening  102  is defined to expose the second electronic element  50 . The second electronic element  50  is specifically an electronic element having a high capacitance. 
     As shown in  FIG.  9   , further, since the optical element  20 , the first electronic element  40 , and the second electronic element  50  are exposed from the opening region of the substrate  11 , the optical element  20 , the first electronic element  40 , and the second electronic element  50  may take one heat dissipator  70  to dissipate heat in subsequent processing. The heat dissipator  70  is arranged on a side of the optical element  20 , the first electronic element  40 , and the second electronic element  50  away from the printed circuit board  30 . The heat dissipator  70  may be a water-cooling heat dissipator or a heat dissipator in other types, which will not be limited herein. 
     The above description shows only embodiments of the present disclosure but does not limit the scope of the present disclosure. Any equivalent structure or equivalent process transformation performed based on the specification and the accompanying drawings of the present disclosure, directly or indirectly applied in other fields, shall be equally covered by the scope of the present disclosure.