CN110568571A - passive optical fiber conversion device - Google Patents
passive optical fiber conversion device Download PDFInfo
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- CN110568571A CN110568571A CN201911019022.1A CN201911019022A CN110568571A CN 110568571 A CN110568571 A CN 110568571A CN 201911019022 A CN201911019022 A CN 201911019022A CN 110568571 A CN110568571 A CN 110568571A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 271
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 41
- 230000003287 optical effect Effects 0.000 claims abstract description 86
- 230000002457 bidirectional effect Effects 0.000 claims description 24
- 239000000835 fiber Substances 0.000 claims description 18
- 210000001503 joint Anatomy 0.000 claims description 2
- 239000000758 substrate Substances 0.000 abstract description 12
- 238000009434 installation Methods 0.000 abstract description 5
- 230000008054 signal transmission Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 239000004033 plastic Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000013308 plastic optical fiber Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000010104 thermoplastic forming Methods 0.000 description 1
- 238000009757 thermoplastic moulding Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
-
- 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
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
-
- 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
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4246—Bidirectionally operating package structures
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention discloses a passive optical fiber conversion device which comprises a shell, wherein a circuit board is arranged in an inner cavity of the shell, an optical fiber coupler is arranged on the circuit board, an optical fiber adapter is arranged on a shell wall, and an optical fiber connector is adopted between the optical fiber coupler and the optical fiber adapter for optical signal connection. The passive optical fiber conversion device is characterized in that an optical fiber coupler and an optical fiber adapter are arranged in a row, and optical signals are connected between the optical fiber coupler and the optical fiber adapter through an optical fiber connector; therefore, when an optical signal passes through the optical fiber connector to the optical fiber adapter, the optical fiber adapter is a passive optical fiber adapter, and when the optical fiber adapter is connected with an external optical fiber line, the optical signal can be provided without power supply; and because the substrate of the optical fiber coupler base body is vertically designed with the plurality of pins, the external specification size is smaller, the surface mount type installation at any position of the circuit board is convenient, the assembly is convenient, and the specification size of the passive optical fiber conversion device can be reduced.
Description
Technical Field
The invention relates to an optical signal conversion device, in particular to a passive optical fiber conversion device.
Background
When optical fibers are used to receive/transmit optical signals, as shown in fig. 1,2 and 3, all fiber conversion devices 100 found on the market are active fiber couplers 10' and plastic fiber couplers. The optical fiber coupler 10 'is disposed on the housing 101 of the optical fiber conversion device 100, the light receiving chip 24 and the pins 252 thereof, the light emitting chip 23 and the pins 251 thereof disposed in the package cover 21 of the optical fiber coupler 10' are disposed on the same vertical plane, and the axes corresponding to the light receiving positioning hole 32 and the light emitting positioning hole 31 corresponding to the light receiving hole 26 and the light emitting hole 27 are perpendicular to the plane where the light receiving chip 24 and the light emitting chip 23 are disposed, respectively. The external optical fiber line 60 is inserted into the light receiving hole 26 and/or the light emitting hole 27 through the connector 61 and has its optical core 63 butted against the light receiving chip 24 and/or the light emitting chip 23 so that the external optical fiber line 60 is substantially perpendicular to the pins 25. However, the pins 25 of the in-line optical fiber coupler 10 ' are all fixedly and vertically soldered on the circuit board 30 by manual soldering, and need to be powered through the circuit board 30, which is also called as an active optical fiber coupler 10 ', and this brings great inconvenience to users in many applications, for example, the optical fiber coupler 10 ' has a bulky external shape, and is soldered by manual direct insertion, which limits the use effect and production efficiency.
Disclosure of Invention
Based on the above problems, the present invention is to provide a passive optical fiber conversion apparatus, which includes an optical fiber coupler disposed at any position on a circuit board, has a small external size, and does not need to provide a corresponding power supply between external optical fiber lines.
the technical scheme of the invention is as follows:
A passive optical fiber conversion device comprises a shell, wherein a circuit board is arranged in an inner cavity of the shell, an optical fiber coupler is arranged on the circuit board, an optical fiber adapter is arranged on a shell wall, and an optical fiber connector is adopted between the optical fiber coupler and the optical fiber adapter for optical signal connection.
In the passive optical fiber conversion device, an optical fiber coupler comprises a base body and a plurality of pins, wherein the pins are vertically led out downwards from the base of the base body; the light emitting hole and the light receiving hole provided on the upper surface of the base body correspond to the light emitting chip and the light receiving chip provided in the base body, respectively.
The passive optical fiber conversion device further comprises a positioning clamp cover arranged on the upper surface of the base body, wherein a light receiving positioning hole and a light emitting positioning hole are arranged on the positioning clamp cover along the vertical direction, and the light receiving positioning hole and the light emitting positioning hole are respectively positioned above the light receiving hole and the light emitting hole.
the passive optical fiber conversion device comprises an optical fiber connector and connectors, wherein the connectors are respectively arranged at two ends of the optical fiber, and the optical fiber is respectively connected with the optical fiber coupler and the optical fiber adapter through the book searching connectors at the two ends; wherein, every the specification and size of connector is the same, or every the specification and size of connector is different.
the passive optical fiber conversion device is characterized in that the optical fiber line is a single-core bidirectional optical fiber line, and the single-core bidirectional optical fiber line comprises an optical core; each end of the optical core is provided with one connector, and two optical fiber heads are arranged in each connector side by side; each end of the optical core is respectively butted with two optical fiber heads; or
each end of the optical core is respectively provided with two independent connectors, each connector is internally provided with an optical fiber head independently, and each end of the optical core is in butt joint with two optical fiber heads respectively.
The passive optical fiber conversion device is characterized in that the optical fiber line is a double-core bidirectional optical fiber line; (ii) a The double-core bidirectional optical fiber line comprises two optical cores; each end of the two optical cores shares one connector, and two optical fiber heads are arranged in each connector side by side; or
Each optical core both ends respectively two independent connectors are in every be equipped with an optical fiber head alone in the connector.
The passive optical fiber conversion device comprises an optical fiber coupler and a plurality of passive optical fiber conversion units, wherein the optical fiber coupler comprises a base body and a plurality of pins, and the pins are vertically led out downwards from the base of the base body; the light emitting hole or the light receiving hole provided on the upper surface of the base body corresponds to the light emitting chip or the light receiving chip provided in the base body.
The passive optical fiber conversion device further comprises a positioning card cover arranged on the upper surface of the base body, wherein a light receiving positioning hole or a light emitting positioning hole is arranged on the positioning card cover along the vertical direction, and the light receiving positioning hole or the light emitting positioning hole is positioned above the light receiving hole or the light emitting hole.
The passive optical fiber conversion device comprises an optical fiber connector and connectors, wherein the connectors are respectively arranged at two ends of the optical fiber connector, and the optical fiber connector is respectively connected with the optical fiber coupler and the optical fiber adapter through the connectors.
The passive optical fiber conversion device is characterized in that the optical fiber line is a single-core unidirectional optical fiber line; the two ends of the optical core in the single-core unidirectional optical fiber line are respectively provided with the connector; an optical fiber head is arranged in each connector.
The passive optical fiber conversion device provided by the invention is characterized in that the optical fiber coupler and the optical fiber adapter are arranged in a row, and are connected with each other through the optical fiber connector in an optical signal manner; therefore, when an optical signal passes through the optical fiber connector to the optical fiber adapter, the optical fiber adapter is a passive optical fiber adapter, and when the optical fiber adapter is connected with an external optical fiber line, the optical signal can be provided without power supply; and because the optical fiber coupler adopts the design that the substrate of the base body is vertical to the pins, the external specification size is smaller, the surface mount type installation is convenient to carry out at any position of the circuit board, the assembly is convenient, and the specification size of the passive optical fiber conversion device can be reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional fiber coupler;
3 FIG. 32 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 31 3; 3
FIG. 3 is a schematic structural diagram of a conventional active optical fiber conversion device;
FIG. 4 is a schematic diagram of an optical fiber coupler according to the present invention;
FIG. 5 is a sectional view taken along line B-B of FIG. 4;
FIG. 6 is a schematic structural diagram of a passive optical fiber conversion device according to the present invention;
FIGS. 7A and 7B are schematic diagrams of a single-core bidirectional optical fiber structure;
FIGS. 8A and 8B are schematic diagrams of a dual-core bidirectional fiber structure;
FIG. 9 is a schematic diagram of a fiber coupler with a single light emitting chip;
FIG. 10 is a cross-sectional view of portion B '-B' of FIG. 9;
FIG. 11 is a schematic diagram of a single-core unidirectional fiber structure.
Detailed Description
The preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
example one
As shown in fig. 4, 5 and 6, the passive optical fiber conversion apparatus 100 provided by the present invention includes a housing 101, and a circuit board 30 is disposed in an inner cavity 102 of the housing 101. In this embodiment, the housing 101 is provided with a bottom case 1012 and an upper cover 1011 in consideration of the convenience of installation, and the bottom case 1012 and the upper cover 1011 are fixedly connected by screws 1013 after being covered. When the circuit board 30 is mounted, the upper cover 1011 is opened, and the circuit board 30 is disposed at the bottom of the inner cavity 102, i.e., the circuit board 30 is fixedly disposed at the bottom of the housing 101. In other embodiments, the circuit board 30 may be disposed on the inner side wall of the housing 101 according to design requirements. The optical fiber coupler 10 and other electric devices 301 are disposed on the circuit board 30, the optical fiber adapter 50 is disposed on the wall of the housing 101, and receives/transmits optical signals through the external optical fiber line 60, and the optical fiber coupler 10 and the optical fiber adapter 50 are connected by the optical fiber connector 40. The optical fiber coupler 10 transmits the emitted light sequentially through the optical fiber connector 40, the optical fiber adapter 50 and the external optical fiber line 60; similarly, the external optical fiber 60 transmits the external optical signal to the optical fiber adapter 50 and the optical fiber connector 40 in sequence, and the optical fiber coupler 10 receives the external optical signal. Since the optical fiber adapter 50 is separately disposed on the wall of the housing 101, it does not need to be powered by the circuit board 30, and therefore, compared to the existing active optical fiber converter which needs to be powered by the circuit board 30, the optical fiber adapter 50 does not need to be powered by the circuit board, and is also called a passive optical fiber adapter 50, and correspondingly, the optical fiber conversion device is also called a passive optical fiber conversion device 100.
In the passive optical fiber conversion apparatus 100, the optical fiber coupler 10 is designed in a rectangular patch structure, and is conveniently welded on the circuit board 30 by an SMT chip mounter. The optical fiber coupler 10 comprises a basal body 20 and a plurality of pins 25, wherein the plurality of pins 25 are vertically led out downwards from a base 22 of the basal body 20, and the bottom surface of the base 22 is parallel to a horizontal plane; the light emitting hole 27 and the light receiving hole 26 provided on the upper surface of the base body 20 correspond to the light emitting chip 23 and the light receiving chip 24 in the base body 20, respectively, i.e., the light emitting hole 27 is provided corresponding to the light emitting chip 23 and the light receiving hole 26 is provided corresponding to the light receiving chip 24. The specific structural design is as follows:
The base body 20 of the optical fiber coupler 10 includes a substrate 22, a light emitting chip 23, a light receiving chip 24, and a package cover 21; the substrate 23 is located at the bottom of the base 20, and the encapsulation cover 21 is the upper portion of the base 20. The light emitting chips 23 and the light receiving chips 24 are horizontally arranged on the upper surface of the substrate 22 at intervals, and the package cover 21 is stacked on the upper surface of the substrate 22 and hermetically seals the outer edges of the light emitting chips 23 and the light receiving chips 24. In this embodiment, there are two chips, namely the light emitting chip 23 and the light receiving chip 24, in other embodiments, there may be a plurality of light emitting chips 23 and light receiving chips 24 in the same number, and the two chips are arranged on the upper surface of the substrate 22 in a staggered horizontal interval arrangement; or a plurality of light emitting chips 23 and a plurality of light receiving chips 24 are horizontally arranged on the upper surface of the substrate 22 at intervals; the number of the light emitting chips 23 and the number of the light receiving chips 24 may be different, and the arrangement design may be performed according to the light conversion requirement.
The corresponding pins (251,252) of the light emitting chip 23 and the light receiving chip 24 are respectively arranged on two sides of the substrate 22 at regular intervals, and the pins 25 are perpendicular to the plane where the light emitting chip 23 and the light receiving chip 24 are located, that is, the pins 25 are perpendicular to the surface of the substrate 22. By adopting the design, the SMT chip mounter can be conveniently mounted on the circuit board 30. The package cover 21 and the substrate 22 hermetically package the light emitting chip 23 and the light receiving chip 24 together.
A light emitting hole 27 and a light receiving hole 26 are provided in the package cover 21 in the vertical direction, the light emitting hole 27 and the light receiving hole 26 being respectively located above the areas where the light emitting chip 23 and the light receiving chip 24 are located, that is, the light emitting hole 27 is located directly above the area where the light emitting chip 23 is located, and the light receiving hole 26 is located directly above the area where the light receiving chip 24 is located. The light emitting hole 27 is in accordance with the light receiving hole 26, the light emitting chip 23 is in accordance with the light receiving chip 24, and the light emitting hole 27 is in accordance with the light emitting chip 23, that is, the external dimensions of the light emitting chip 23 and the light receiving chip 24 are in accordance with the external dimensions of the cross sections of the light emitting hole 27 and the light receiving hole 26, respectively, so that the emitted light signal emitted by the light emitting chip 23 is sent out through the light emitting hole 27 as much as possible, and the input light receiving signal is transmitted to the light receiving chip 24 through the light receiving hole 26, thereby reducing the loss of the light signal as much as possible.
The light emitting hole 27 and the light receiving hole 26 may be circular, or oval, or square, and designed as desired. The utility model is round, can realize blind search and is convenient to operate.
For the corresponding pins 25 of the light emitting chip 23 and the light receiving chip 24, the number of pins 25 of each chip may be 3 or 2, or the number of pins 25 of the light emitting chip 23 and the light receiving chip 24 may be 6, 4 or 3 altogether, which needs to be designed according to actual requirements.
The optical fiber coupler 10 generally further includes a positioning cap 11 disposed on the upper surface of the package cover 21, and the positioning cap 11 and the package cover 21 are fastened or buckled on two corresponding sides in the length direction, so as to facilitate the assembly and disassembly. The upper end face of the retainer cap 11 is provided with a light receiving positioning hole 31 and a light emitting positioning hole 32 in the vertical direction, the light receiving positioning hole 31 and the light emitting positioning hole 32 are respectively located above the light receiving hole 27 and the light emitting/receiving hole 26, and the light receiving positioning hole 31 coincides with the central axis of the light receiving hole 27 and the light emitting/receiving hole 32 coincides with the central axis of the light emitting/receiving hole 26.
The material of the positioning card cover 11 can be stainless steel, aluminum alloy or plastic, and the thickness thereof is about 2-5 mm. If the thickness of the positioning clamp cover 11 is too high, the height of the optical fiber coupler in the vertical direction is increased, so that the common thickness of the whole optical fiber coupler 10 and the positioning cover 11 needs to be increased, and a larger vertical space size is needed invisibly; if the thickness of the positioning card cover 11 is too low, the heights of the corresponding light receiving positioning hole 31 and light emitting positioning hole 32 are also lowered, and when the optical fiber line is inserted into the light receiving positioning hole 31 and/or light emitting positioning hole 32, there is a possibility that the optical fiber line may be loosened due to a lower fixing height of the effective positioning hole in the vertical direction. Therefore, the preferred thickness of the retainer cap 11 is 4 mm.
As shown in fig. 6, the optical fiber connector 40 used in conjunction with the optical fiber coupler 10 includes an optical fiber line 404 and connectors (401 and 402) disposed at two ends of the optical fiber line 404, wherein the outer diameters of the connectors (401 and 402) are slightly larger than the outer diameter of the optical fiber line 404, so as to form an interference fit with the light emitting positioning hole 32 and/or the light receiving positioning hole 31 on the package cover 21, thereby achieving a firm connection. In this embodiment, the connector 401 configured to be connected with the optical fiber coupler 10 may be made of rubber, plastic or hardware, and may be configured as a standard optical fiber connector or a connector with other configuration, and the configuration may be designed as a snap structure (adapted to be engaged with a snap groove disposed on the light receiving hole 27 and/or the light receiving/emitting hole 26) or an external thread structure (adapted to be screwed with an internal thread disposed on an inner wall of the light receiving hole 27 and/or the light receiving/emitting hole 26), so as to fixedly connect the optical fiber 404 with the optical fiber coupler, thereby ensuring a high coupling ratio of receiving or sending optical signals through the optical fiber 401, when the optical fiber connector 40 is mated with the optical fiber coupler 10, the connector 401 of the optical fiber 404 is mated with the light receiving hole 27 and/or the light receiving/emitting hole 26 of the optical fiber coupler 10, and then the optical core 403 of the optical fiber 40 is mated with the light receiving chip 24 and/or the light emitting chip 23 of the optical fiber coupler 10 Vertically opposite to each other; accordingly, another connector 402 of the fiber optic line 404 can be snapped or plugged into the fiber optic adapter 50. The external interface of the optical fiber adapter 50, also referred to as an application port, may be connected to an adapter 61 such as a production industrial control adapter, an automobile signal adapter, an aviation adapter, etc. when the optical fiber adapter is connected to the application port, an optical core 63 in the adapter 61 is vertically connected to the front of an optical core 403 of an optical fiber 404, so as to avoid the refraction loss of light. Thus, the two connectors (401 and 402) of the fiber optic line 404 of the fiber optic connector 40 may be configured as custom fiber splices, standard fiber splices, or the like, as desired. As for the connectors (401 and 402) at the two ends of the optical fiber cable 404, the connectors can be set to have the same specification size (for example, both connectors are standard connectors) or different specification sizes (for example, the connector 401 is a standard connector and the connector 402 is a customized optical fiber connector, or the connector 401 is a customized optical fiber connector and the connector 402 is a standard connector).
As shown in fig. 5, since the pins 25 of the light receiving chip 23 or the light emitting chip 24 are perpendicular to the plane of the light receiving chip 23 and the light emitting chip 24, respectively, that is, perpendicular to the surface of the substrate 22, and the pins 25 are arranged in a surface mount structure, the Surface Mount Technology (SMT) process can be used to perform surface mount soldering on the circuit board 30; because the optical fiber coupler 10 is designed in a surface mount manner, the external dimension is small, and the axes of the light receiving hole 27 and the light emitting hole 26 are perpendicular to the planes of the light receiving chip 23 and the light emitting chip 24, respectively, the optical fiber coupler 11 can be arranged and installed at any position of the circuit board, and meanwhile, the optical signal transmission between the optical fiber coupler 11 and the outside is realized by adopting an optical fiber connector.
because the optical fiber connector 40 can function as a "jumper" on the circuit board 30, it connects two components at different locations with optical signals. In this case, the optical fiber coupler 10 can be regarded as an optical fiber coupler without power supply outside the optical fiber adaptor 50, compared with an active plastic optical fiber coupler 10' (shown in fig. 1) currently used in the market, and the optical fiber adaptor 50 including the optical fiber coupler 10 of the present application can be installed in a matching manner with any other industrial adapter through the optical fiber connector 40; converting the special interface of the optical fiber coupler 10 into a general interface; a user can freely select a connector, optical fiber wires 404 of different types are bridged, so that the purposes of pressure resistance (voltage and pressure), electromagnetic interference resistance, variable loss (the saturation point of receiving sensitivity is high, the optical power can be adjusted to be in the range of-10 db), convenient installation and diversified and simple plastic optical fiber transmission at any angle (more convenient for a surface-mounted optical fiber coupler) are achieved; the user can be more flexible, and waste is avoided.
in this embodiment, the optical fiber line 404 of the optical fiber connector 40 may be a single-core bidirectional optical fiber line or a double-core bidirectional optical fiber line.
as shown in fig. 7A and 7B, the single-core bidirectional optical fiber line, that is, each end of an optical core may be respectively butted with one connector, or each end of an optical core may be butted with two connectors, the outer surface of the 4041 optical core is separately covered by the plastic protective layer 405, and at this time, the 4041 optical core is a bus optical core.
As shown in fig. 7A, when each end of optical core 4041 is butted against a connector (401 or 402), which may be also referred to as a parallel connector, two optical fiber heads are correspondingly arranged in each connector (401 or 402) side by side (i.e. 4031 and 4032 are a pair of parallel optical fiber heads, 4033 and 4034 are a pair of parallel optical fiber heads), where each end of optical core 4041 is butted against two optical fiber heads 403, and each optical fiber head (4031, 4032,4033 or 4034) is used for butting to transmit and/or receive optical signals, respectively; 4041 the optical core is connected to two optical fiber heads at each end in a Y-shaped configuration. In the single-core bidirectional optical fiber line with two connectors, two optical fiber heads (4031 and 4032, or 4033 and 4034) designed in each connector (401 or 402) side by side are generally formed by an integral design, such as thermoplastic forming of a plastic material, forging forming or hot melting forming of a metal material, and the like.
As shown in fig. 7B, when each end of optical core 4041 respectively interfaces with two connectors (i.e., 4011 and 4012 are a pair of independent connectors, 4021 and 4022 are a pair of independent connectors), that is, four independent connectors (4011, 4012,4021, 4022), each connector is also referred to as a single-wire connector, that is, one optical fiber head (4031, 4032,4033, 4034) is separately and correspondingly disposed in each single-wire connector (4011, 4012,4021, 4022), and each end of optical core 4041 also respectively interfaces with two optical fiber heads (4031 and 4032 are a pair, 4033 and 4034), and each optical fiber head (4031, 4032,4033 or 4034) is respectively used for interfacing with an emitted optical signal and/or a received optical signal. In the single-core bidirectional optical fiber line with four connectors, each connector and a single optical fiber head (4031, 4032,4033 or 4034) therein are generally formed by an integral design, such as thermoplastic molding of a plastic material, forging molding or hot melt molding of a metal material, and the like.
The single-core bidirectional optical fiber line adopts a half-duplex working mode for transmitting optical signals and receiving optical signals, and specifically comprises the following steps:
The description will be made by taking fig. 7A as an example. When the optical transmitting chip 23 of the optical fiber coupler 10 transmits an optical signal, the optical signal EL is transmitted to the optical core 4041 through the transmitting optical core of the optical fiber line 404, i.e. the optical fiber head 4031, and is transmitted to the outgoing optical core connected to the optical core 4041, i.e. the optical fiber head 4033, and is transmitted to each optical fiber adapter 50 through the optical fiber head 4043, at this time, the incoming optical core, i.e. the optical fiber head 4034, is inoperative, i.e. does not receive or transmit an incoming optical signal input from the outside; accordingly, when the next optical fiber transmission cycle comes, the external optical signal IL is input through the incident optical core, i.e., the optical fiber head 4034 and the optical core 4041, and is received by the receiving optical core, i.e., the optical fiber head 4032, and then transmitted to the optical receiving chip 24, and at this time, the transmitting optical core, i.e., the optical fiber head 4031, does not operate. Thus, a "split" optical fiber line 404 can realize a half-duplex optical signal transmission mode, which greatly reduces the number of external adapters, and can also reduce optical loss and improve optical transmission efficiency.
A single-core bidirectional optical fiber wire belongs to half-duplex signal transmission, can only transmit a receiving signal or a transmitting signal in a certain time period, and is mainly applied to control data signal transmission in the fields of electric power, automobiles, airplanes, trains, aviation aircrafts and the like.
As shown in fig. 8A and 8B, the optical fiber line 404 is a two-core bidirectional optical fiber line. The two-core bidirectional optical fiber shows that the optical fiber 404 has two optical cores 403 arranged side by side and is covered and isolated by a plastic protective layer 405. The double-core bidirectional optical fiber line can also be obtained by doubling and cladding two single-core unidirectional optical fiber lines together.
as shown in fig. 8A, when each end of two optical cores 403 shares a connector (401 or 402), the connector is also called a parallel connector, that is, two optical fiber heads (4031 and 4032 are a pair of parallel optical fiber heads, and 4033 and 4034 are a pair of parallel optical fiber heads) are correspondingly arranged in each connector (401 or 402).
As shown in fig. 8B, when two independent connectors (4011 and 4012 are a pair of independent connectors, 4021 and 4022 are a pair of independent connectors) are respectively disposed at two ends of each optical core 403, the connectors are single-wire connectors, that is, one optical fiber head (4031, 4032,4033, 4034) is separately disposed in each connector (4011, 4012,4021, 4022).
the connection principle of the double-core bidirectional optical fiber line is the same as that of the single-core bidirectional optical fiber line, and the description is omitted here. However, the principle of optical signal transmission of the two-core bidirectional optical fiber line is different from that of the single-core bidirectional optical fiber line. The double-core bidirectional optical fiber line can simultaneously transmit light emission signals and light receiving signals, is mutually independent and non-interfering, can independently work in a full time period, namely belongs to full duplex signal transmission, can simultaneously transmit receiving signals and emission information in any time period, and is mainly used in the field of optical fiber network communication, such as optical fiber television signal transmission, internet network signal transmission and the like.
Example two
The difference from the first embodiment is that:
As shown in fig. 9 and 10, there is only one chip on the optical fiber coupler 10, that is, there is only one light emitting chip 23 or light receiving chip 24 in the base body 20 of the optical fiber coupler 10, that is, there is only one chip; meanwhile, only the light emitting hole 27 or the light receiving hole 26 is provided on the package cover 21 corresponding to the light emitting chip 23 or the light receiving chip 24 in the base body 20, that is, the light emitting hole 27 is provided corresponding to the light emitting chip 23 or the light receiving hole 26 is provided corresponding to the light receiving chip 24. In this embodiment, the chip disposed on the base body 2 is the light emitting chip 23, and correspondingly, the package cover 21 has only one light emitting hole 27. In other embodiments, the chip provided on the base body 2 is the light receiving chip 24; correspondingly, there is only one light receiving aperture 26 in the encapsulation cover 21.
Accordingly, the positioning card cover 11 is also provided with only one light receiving positioning hole 31 above the light receiving hole 26, or only one light emitting positioning hole 32 above the light receiving hole 27. In the present embodiment, a light emission positioning hole 32 corresponds to the light emission hole 27. In other embodiments, the positioning card cover 11 is a light receiving positioning hole 26.
In this case, a single-core unidirectional optical fiber line is used as the optical fiber line in the optical fiber connector, as shown in fig. 11. Two ends of an optical core 4041 in the single-core unidirectional optical fiber line 404 are respectively provided with a connector (401, 402); a fiber optic head 403 is provided within each connector head (401 or 402). The single-core unidirectional optical fiber line can only be used for transmitting optical signals or receiving optical signals, namely, at any time, the optical fiber line for transmitting the transmitting optical signals can only transmit the transmitting optical signals, and the optical fiber line for transmitting the receiving optical signals can only transmit the receiving optical signals. The single-core unidirectional optical fiber wire is used for unidirectional data signal transmission, and is generally suitable for control data signal transmission on an automatic production line of a production workshop and control data signal transmission in other industrial control fields, such as industrial mechanical arms, variable frequency speed regulation, motor control, industrial equipment fault signal transmission and the like.
The passive optical fiber conversion device provided by the invention has the following advantages:
1. The optical coupler is designed in a surface mount type, has small appearance size, can be installed and arranged at any place on a circuit board, and is suitable for application occasions with compact installation space, such as automobiles, airplanes, aviation aircrafts, industrial controllers and the like, because the optical fiber connector is used as a 'jumper' for receiving and/or transmitting optical signals in the device;
2. when the optical fiber adapter is arranged on the shell wall and connected with an external application port, the external application port is passively driven through the optical fiber connector, can be coupled at any angle, and can be flexibly suitable for different application occasions;
3. The optical fiber line of the optical fiber connector can realize high voltage resistance (voltage and pressure), and the light attenuation of the optical fiber line can be adjusted to adapt to the light intensity saturation points of different light receiving chips.
It should be understood that the above description is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A passive optical fiber conversion device is characterized by comprising a shell, wherein a circuit board is arranged in an inner cavity of the shell, an optical fiber coupler is arranged on the circuit board, an optical fiber adapter is arranged on the wall of the shell, and an optical fiber connector is adopted between the optical fiber coupler and the optical fiber adapter for optical signal connection.
2. The passive fiber optic conversion device of claim 1, wherein the fiber optic coupler comprises a base and a plurality of pins that exit vertically downward from a base of the base; the light emitting hole and the light receiving hole provided on the upper surface of the base body correspond to the light emitting chip and the light receiving chip provided in the base body, respectively.
3. The passive optical fiber conversion device according to claim 2, wherein the optical fiber coupler further comprises a positioning cap disposed on the upper surface of the base, and a light receiving positioning hole and a light emitting positioning hole are disposed on the positioning cap in a vertical direction, and the light receiving positioning hole and the light emitting positioning hole are respectively located above the light receiving hole and the light emitting hole.
4. The passive optical fiber conversion device according to claim 2 or 3, wherein the optical fiber connector comprises an optical fiber line and connectors respectively arranged at two ends of the optical fiber line; the optical fiber line is respectively connected with the optical fiber coupler and the optical fiber adapter through the connectors at two ends.
5. the passive optical fiber conversion device of claim 4, wherein the optical fiber line is a single-core bidirectional optical fiber line comprising an optical core; each end of the optical core is provided with one connector, and two optical fiber heads are arranged in each connector side by side; each end of the optical core is respectively butted with two optical fiber heads; or
Each end of the optical core is respectively provided with two independent connectors, each connector is internally provided with an optical fiber head independently, and each end of the optical core is in butt joint with two optical fiber heads respectively.
6. The passive optical fiber conversion device of claim 4, wherein the optical fiber line is a dual-core bidirectional optical fiber line; the double-core bidirectional optical fiber line comprises two optical cores; each end of the two optical cores shares one connector, and two optical fiber heads are arranged in each connector side by side; or
Two independent connectors are respectively arranged at two ends of each optical core, and one optical fiber head is independently arranged in each connector.
7. The passive fiber optic conversion device of claim 1, wherein the fiber optic coupler comprises a base and a plurality of pins extending vertically downward from a base of the base; the light emitting hole or the light receiving hole provided on the upper surface of the base body corresponds to the light emitting chip or the light receiving chip provided in the base body.
8. The passive optical fiber conversion device according to claim 7, wherein the optical fiber coupler further comprises a positioning cap disposed on the upper surface of the base, and a light receiving positioning hole or a light emitting positioning hole is disposed on the positioning cap in a vertical direction, and the light receiving positioning hole or the light emitting positioning hole is located above the light receiving hole or the light emitting hole.
9. The passive optical fiber conversion device according to claim 7 or 8, wherein the optical fiber connector comprises an optical fiber line and connectors respectively disposed at two ends of the optical fiber line; the optical fiber line is connected with the optical fiber coupler and the optical fiber adapter through connectors respectively.
10. The passive optical fiber conversion device of claim 9, wherein the optical fiber line is a single-core unidirectional optical fiber line; the optical fiber cable is characterized in that two ends of an optical core in the single-core unidirectional optical fiber cable are respectively provided with one connector, and an optical fiber head is arranged in each connector.
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| CN201911019022.1A CN110568571A (en) | 2019-10-24 | 2019-10-24 | passive optical fiber conversion device |
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| CN201911019022.1A CN110568571A (en) | 2019-10-24 | 2019-10-24 | passive optical fiber conversion device |
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| CN114415299A (en) * | 2022-03-30 | 2022-04-29 | 深圳市埃尔法光电科技有限公司 | Optical fiber signal direct-guiding type optical module |
| CN114415297A (en) * | 2022-03-30 | 2022-04-29 | 深圳市埃尔法光电科技有限公司 | Method for directly transmitting optical fiber signal to functional optical module |
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