CN116068700A - Wavelength division multiplexing device - Google Patents
Wavelength division multiplexing device Download PDFInfo
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- CN116068700A CN116068700A CN202111284202.XA CN202111284202A CN116068700A CN 116068700 A CN116068700 A CN 116068700A CN 202111284202 A CN202111284202 A CN 202111284202A CN 116068700 A CN116068700 A CN 116068700A
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- light
- connecting part
- division multiplexing
- wavelength division
- multiplexing device
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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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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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
- 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
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
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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
- 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
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
Abstract
The embodiment of the application discloses a wavelength division multiplexing device, which comprises a frame body and a receiver, wherein the frame body and the receiver are arranged together; the frame body is provided with a first connecting part, a second connecting part and a third connecting part which are sequentially distributed along a first direction and integrally formed; the first connecting part is provided with a collimator, the second connecting part is provided with a beam splitter, the third connecting part is provided with a reflector, and the reflector and the third connecting part are integrally formed; the collimator receives the incident light and collimates the incident light to form a collimated beam, the beam splitter receives the collimated beam and splits the collimated beam into a plurality of outgoing beams having different wavelengths, and the reflector receives the plurality of outgoing beams and reflects and converges the plurality of outgoing beams respectively to the receiver. The technical scheme of this application can integrate collimator, reflector and beam splitter in the framework, makes the encapsulation between each part simplify, and manufacturing cost is lower, and packaging efficiency is higher, and the reflector of integration compares in the combination of original right angle prism and focusing lens, and is less to the optical energy decay.
Description
[ field of technology ]
The present application relates to the field of optical fiber communications technologies, and in particular, to a wavelength division multiplexing device.
[ background Art ]
WDM (Wavelength-division multiplexing) is a technique of transmitting multiple Wavelength lasers simultaneously on a single optical fiber using multiple lasers. The existing CWDM (Coarse wavelength division multiplexing) system mainly comprises an optical fiber, a collimating lens, a multiplexer/demultiplexer (MUX/DEMUX), a detector (PD)/a laser, and the like. In theory DWDM (Dense WDM) can use a similar scheme but with greater difficulty.
The injection molding is to heat the injection molding glue to a certain temperature by using an injection molding machine, then melt the injection molding glue into liquid, inject the molten liquid into a closed mold cavity by using high pressure, and then open the mold to obtain the required injection molding product. The injection molding process can greatly improve the production efficiency, reduce the cost and has wide application in optical communication.
Wavelength division multiplexing devices in the market at present adopt a free space discrete structure to realize optical demultiplexing. In the structure, n wavelengths of incident light are transmitted in an optical fiber, collimated and split into multiple paths of light rays with different wavelengths, converged and deflected by 90 degrees into a PD, and the PD generates current to complete conversion from an optical signal to an electric signal. However, the wavelength division multiplexing device needs to use a plurality of discrete components, and has long assembly time and high material cost. Even if some wavelength division multiplexing devices are used for installing part of components together, the wavelength division multiplexing devices still have discrete components, and the integration level is not high enough. And the use of two components, a right angle prism and a focusing lens, increases the attenuation of light.
[ invention ]
In view of the foregoing, an embodiment of the present application provides a wavelength division multiplexing device to solve the problems in the prior art.
In a first aspect, an embodiment of the present application provides a wavelength division multiplexing device, including: a frame and a receiver mounted with the frame; the frame body is provided with a first connecting part, a second connecting part and a third connecting part, and the first connecting part, the second connecting part and the third connecting part are sequentially distributed along a first direction and are integrally formed; the first connecting part is provided with a collimator, the second connecting part is provided with a beam splitter, the third connecting part is provided with a reflector, and the reflector and the third connecting part are integrally formed; the collimator receives the incident light and collimates the incident light to form a collimated light beam, the beam splitter receives the collimated light beam and splits the collimated light beam into a plurality of outgoing light beams with different wavelengths, and the reflector receives the plurality of outgoing light beams and reflects and converges the plurality of outgoing light beams to the receiver, respectively.
Through the scheme that this embodiment provided, with framework integrated into one piece's structure in the manufacturing, integrated collimator, beam splitter and reflector in the framework, the reduction assembly degree of difficulty promotes packaging efficiency, makes the encapsulation simpler and easy, and the cost is lower, and packaging efficiency is higher, can receive respectively after the light demultiplexing of different wavelength for in the optical communication equipment.
In a preferred embodiment, the collimator is integrally formed with the first connection portion, the collimator having an incident surface and a collimation surface in the first direction, the collimation surface facing the beam splitter; the incident light enters the collimator from the light incident surface, is collimated by the collimation surface to form a collimated light beam, and then is projected to the beam splitter.
According to the scheme provided by the embodiment, the collimator is made into the integrated part of the frame body, and the assembling process of the wavelength division multiplexing device can be completed only by installing the beam splitter on the second connecting part during assembling, so that the integration and the assembling efficiency of the wavelength division multiplexing device are further improved.
In a preferred embodiment, the first connection has a mounting part located at the light-in face of the collimator, through which an external emitter is docked with the light-in face of the collimator.
According to the scheme provided by the embodiment, the external transmitter and the collimator are coupled through the mounting component, so that the connection between the external transmitter and the collimator is firmer, the incident optical axis of the external transmitter can be aligned with the collimation optical axis of the collimator, and incident light can enter the collimator in normal incidence.
In a preferred embodiment, the mounting member is a mounting hole, the mounting hole extends along the first direction, the light incident surface of the collimator is a bottom of the mounting hole, which is close to the second connection portion along the first direction, and an axis of the mounting hole is located in the same line with an optical axis of the light incident surface.
According to the scheme provided by the embodiment, the light incident surface of the collimator is used as the bottom of the mounting hole, the mounting hole and the light incident surface are coaxially arranged, when the external emitter is inserted into the mounting hole, the mounting hole is used as a guide channel to be in butt joint with the light incident surface and align with the light path, and the rapid coupling of the external emitter and the collimator is realized.
In a preferred embodiment, the inner wall of the mounting hole is provided with an air hole, and the air hole is connected with the receiver.
Through the scheme that this embodiment provided for can be through the gas pocket with air vent when the mounting hole passes through the mode of gluing installation external power source, further promote wavelength division multiplexing device's precision and leakproofness.
In a preferred embodiment, the receiver has a connection face which is parallel to the first direction and faces the frame; the first connecting part and the third connecting part are respectively connected to the connecting surface, an interval is reserved between the second connecting part and the connecting surface, a limiting groove is formed in the surface, facing the connecting surface, of the second connecting part, and the beam splitter is fixed in the limiting groove.
According to the scheme provided by the embodiment, the beam splitter is limited between the frame body and the receiver and between the collimator and the reflector through the limiting groove, so that the position of the beam splitter is limited, the propagation path of light is fixed, and the light cannot deviate when propagating in the beam splitter.
In a preferred embodiment, the receiver includes a photoelectric conversion element and a circuit board, the connection surface is a surface of the circuit board facing the frame, the photoelectric conversion element is mounted on the connection surface, the circuit board is connected with the first connection portion and the third connection portion through the connection surface, and the photoelectric conversion element is located at the light outlet of the reflector.
Through the scheme that this embodiment provided, the circuit board had both played the effect of supporting the framework, also played and had been encircleed the beam splitter in the middle of framework and circuit board in order to protect the beam splitter not to receive environmental factor influence and the light that propagates in the beam splitter outwards overflows, arrange in the third direction mutually perpendicular for first direction and second direction through reflector and photoelectric conversion piece, the length of framework in first direction has been saved through the mode that changes the light path direction, the thickness of framework in the third direction has been utilized, the installation space that the whole wavelength division multiplexing device took has further been saved, more space and degree of freedom have been provided for the installation of other components of optical communication equipment.
In a preferred embodiment, the first connecting portion and the third connecting portion are fixed to the connecting surface by dispensing.
By the scheme provided by the embodiment, the complete wavelength division multiplexing device with high integration level and no relative displacement between all the components is formed.
In a preferred embodiment, the reflecting surface of the reflector is a biconic surface, and the beam splitter and the receiver are located on both sides of the optical axis of the reflecting surface.
According to the scheme provided by the embodiment, the biconic surface of the reflector is used as the reflecting surface, so that emergent light beams with corresponding wavelengths can be converged from large light spots to small light spots and enter the receiver, and the emergent light beams can be received by the receiver completely.
In a preferred embodiment, the reflecting surface is a convex mirror protruding towards the receiver or a concave mirror recessed opposite the receiving surface.
By the solution provided by the present embodiment, the convex mirror and the concave mirror realize the deflection function by changing the propagation direction of the light.
In a preferred embodiment, the reflector comprises a plurality of reflecting elements arranged along a second direction, the second direction intersecting the first direction;
the number of the reflecting units is the same as that of the emergent light beams, and each reflecting unit correspondingly receives one emergent light beam;
each reflecting unit has an included angle with the corresponding received emergent beam.
According to the scheme provided by the embodiment, the emergent light beams with the corresponding wavelengths are reflected to the corresponding positions in the receiver by utilizing the reflecting units, so that independent light paths of the emergent light beams with each wavelength are not interfered, the emergent light beams with each wavelength are deflected by the reflecting units with the corresponding wavelengths by a certain angle and then are transmitted to the photoelectric conversion parts corresponding to the wavelengths in the receiver, and the photoelectric conversion parts transmit the emergent light beams with the wavelengths, so that the function of demultiplexing the incident light is achieved.
In a preferred embodiment, the plurality of outgoing light beams form an outgoing plane, the plurality of reflection units are located on the outgoing plane, and the second direction is perpendicular to the first direction.
Through the scheme provided by the embodiment, the emergent light beams emergent through the beam splitters are horizontally emergent and vertically downwards spread into the receiver.
In a preferred embodiment, the beam splitter has a reflector, a light guide, and a plurality of filters;
the light guide member is provided with a light inlet side and a light outlet side along the first direction, the light inlet side is provided with a light inlet part and a light reflecting part, the light inlet part is used for receiving the collimated light beam, the light reflecting part is provided with the reflecting member, the light outlet side is provided with the plurality of filter plates, and the filter plates are used for transmitting and reflecting light rays simultaneously;
each filter outputs one emergent light beam, and the wavelengths of the emergent light beams output by different filters are different.
According to the scheme provided by the embodiment, the characteristic that the filter only transmits light rays with specific wavelengths is adopted, the light rays with different wavelengths in the incident light are separated, and then are transmitted to the receiver through different light paths, so that the demultiplexing of the light rays is realized, and further, different electric signals are generated in the receiver through photoelectric conversion.
In a preferred embodiment, the light incident side and the light emergent side are parallel to each other, and the interval between two adjacent filter sheets is the same.
By the scheme provided by the embodiment, all outgoing light beams emitted by the optical filter are projected onto the reflector in parallel, and then all light spots reflected and converged by the reflector are uniform in size and identical in interval, and the light energy attenuation of light rays with all wavelengths received by the receiver is basically identical.
In a second aspect, embodiments of the present application provide an optical converter comprising a transmitter and a wavelength division multiplexing device according to the first aspect, the transmitter interfacing with a collimator of the wavelength division multiplexing device.
In a third aspect, embodiments of the present application provide an optical communication device comprising a signal transceiver and an optical converter according to the second aspect, the optical converter being connected to the signal transceiver.
Compared with the prior art, the technical scheme has at least the following beneficial effects:
the wavelength division multiplexing device disclosed by the embodiment of the application integrates the components such as the collimator, the reflector, the beam splitter and the like in one frame body, so that the packaging among the components is simplified, the production cost is lower, the assembly efficiency is higher, and the integrated reflector is smaller in light energy attenuation compared with the combination of the original right-angle prism and the focusing lens.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a wavelength division multiplexing device according to an embodiment of the present application;
fig. 2 is a perspective view of a wavelength division multiplexing device according to an embodiment of the present application;
fig. 3 is a side view of a wavelength division multiplexing device provided in an embodiment of the present application;
fig. 4 is an end view of a wavelength division multiplexing device provided in an embodiment of the present application;
fig. 5 is a top view of an optical path of the wavelength division multiplexing device according to the embodiment of the present application when light is transmitted;
FIG. 6 is a side view of an optical path of a wavelength division multiplexing device according to an embodiment of the present disclosure when transmitting light;
fig. 7 is an oblique view of an optical path of a wavelength division multiplexing device according to an embodiment of the present disclosure when transmitting light;
fig. 8 is an optical path diagram of the case where the reflecting surface of the reflector in the frame of the wavelength division multiplexing device according to the embodiment of the present application is a convex mirror;
fig. 9 is an optical path diagram of the case where the reflecting surface of the reflector in the frame of the wavelength division multiplexing device provided in the embodiment of the present application is a concave mirror;
fig. 10 is a schematic structural diagram of a reflector in a frame of the wavelength division multiplexing device according to the embodiment of the present application when the reflecting surface is a convex mirror;
fig. 11 is a schematic structural diagram of a case in which a reflecting surface of a reflector in a frame of a wavelength division multiplexing device according to an embodiment of the present application is a concave mirror.
[ detailed description ] of the invention
For a better understanding of the technical solutions of the present application, embodiments of the present application are described in detail below with reference to the accompanying drawings.
The embodiment of the application discloses a wavelength division multiplexing device which is a WDM device manufactured by adopting an injection molding process, can be used for respectively receiving different wavelength light rays in an optical fiber after being demultiplexed and is used in optical communication equipment. The following description will be given by taking CWDM as an example, but the technical features used are not limited to CWDM systems.
As shown in fig. 1 to 11, an embodiment of the present application discloses a wavelength division multiplexing device. Referring to fig. 1 and 2, the wavelength division multiplexing device of the present embodiment includes a frame 1 and a receiver 2, the receiver 2 being mounted with the frame 1; the frame body 1 is provided with a first connecting part 3, a second connecting part 4 and a third connecting part 5, and the first connecting part 3, the second connecting part 4 and the third connecting part 5 are sequentially arranged along a first direction D1 and are integrally formed; the first connecting part 3 is provided with a collimator 6, the second connecting part 4 is provided with a beam splitter 7, the third connecting part 5 is provided with a reflector 8, and the reflector 8 and the third connecting part 5 are integrally formed; the collimator 6 receives the incident light L-in and collimates the incident light L-in to form a collimated light beam L-co, the beam splitter 7 receives the collimated light beam L-co and splits the collimated light beam L-co into a plurality of outgoing light beams L-out having different wavelengths, and the reflector 8 receives the plurality of outgoing light beams L-out and reflects and converges the plurality of outgoing light beams L-out, respectively, to the receiver 2.
By adopting the wavelength division multiplexing device of the embodiment, the frame body 1 is manufactured into an integrally formed structure during manufacturing, the collimator 6, the beam splitter 7 and the reflector 8 are integrated in the frame body 1, the assembly difficulty is reduced, the assembly efficiency is improved, the packaging is simpler, the cost is lower, the assembly efficiency is higher, and the light with different wavelengths can be received after being demultiplexed and used in optical communication equipment.
Specifically, in the wavelength division multiplexing device of the present embodiment, the housing 1 is an injection molded piece that is divided into three parts in the first direction D1 (left-to-right direction in fig. 1). The leftmost first connecting part 3 is directly connected with the receiver 2 in a contact way, and the first connecting part 3 can be fixed together in a dispensing way or other ways, or can be connected with the receiver 2 in a non-contact way. In the middle is a second connection 4, which second connection 4 may or may not be in contact with the receiver 2. The third connecting part 5 is arranged on the far right, and the third connecting part 5 is directly connected with the receiver 2 in a contact way, can be fixed together in a dispensing way or other ways, and can also be connected with the receiver 2 in a non-contact way. But at least one of the three parts of the housing 1 is connected to the receiver 2. The first connecting part 3, the second connecting part 4 and the third connecting part 5 are integrally formed, the frame body 1 is manufactured into an integrally formed structure during manufacturing, an integral injection molding part is formed, and only three steps of gluing and aligning and bonding are needed during assembly, so that the operation is simple and convenient, the assembly difficulty is reduced, and the assembly efficiency is improved.
Referring to fig. 2 and 3, in the wavelength division multiplexing device of the present embodiment, the receiver 2 has a connection face 9, and the connection face 9 is parallel to the first direction D1 and faces the frame 1; the first connecting part 3 and the third connecting part 5 are respectively connected to the connecting surface 9, a space 10 is arranged between the second connecting part 4 and the connecting surface 9, a limiting groove 11 is arranged on the surface of the second connecting part 4 facing the receiver 2, and the beam splitter 7 is fixed in the limiting groove 11. The first connecting part 3 and the third connecting part 5 fix the frame body 1 and the receiver 2 from the left side and the right side respectively to form a stable structure, so that the collimator 6 and the reflector 8 can be fixed at a position which does not move relatively on the connecting surface 9 respectively, and the beam splitter 7 clamped on the second connecting part 4 limits the installation range and provides supporting force for counteracting gravity through the edges of the limiting groove 11. In assembly, the beam splitter 7 is first attached to the frame 1, the position of the beam splitter 7 is defined by the limiting groove 11 on the frame 1, and the beam splitter 7 is fixed to the frame 1 by dispensing after the attachment is completed. By these structural designs, the beam splitter 7 is restricted between the frame 1 and the receiver 2 and between the collimator 6 and the reflector 8 by the restricting groove 11, the position of the beam splitter 7 is defined, the optical paths of the collimator 6, the beam splitter 7 and the reflector 8 can be fixed without being disturbed by the outside, the propagation path of the light is fixed, and the light does not deviate when propagating in the beam splitter 7.
Referring to fig. 2 and 3, in the wavelength division multiplexing device of the present embodiment, the receiver 2 includes a photoelectric conversion element 12 and a circuit board 13, the connection surface 9 is a surface of the circuit board 13 facing the frame 1, the photoelectric conversion element 12 is mounted on the connection surface 9 of the circuit board 13 by a bonding manner, and a connection line of an electrical signal is formed between the photoelectric conversion element 12 and the circuit board 13 by wire bond (wire bond) for transmitting the signal after photoelectric conversion to a processing circuit. The circuit board 13 is connected with the first connecting part 3 and the third connecting part 5 through the connecting surface 9, the photoelectric conversion piece 12 is located at the light outlet of the reflector 8, the photoelectric conversion piece 12 is a plurality of Photodiodes (PD) arranged along a second direction D2, the second direction D2 is perpendicular to the first direction D1, and the second direction D2 is parallel to the circuit board 13. As can be seen from fig. 2 and 3, the circuit board 13 is a flat plate with a certain length, a certain width and a relatively thin thickness, the upper surface of the circuit board 13 is a connection surface 9, the first connection portion 3 is connected to the left half portion of the connection surface 9, the third connection portion 5 is connected to the right half portion of the connection surface 9, the photoelectric conversion element 12 is also arranged on the right half portion of the connection surface 9, the reflector 8 is suspended from the third connection portion 5 to extend above the photoelectric conversion element 12, and a certain distance is kept between the reflector 8 and the photoelectric conversion element 12. With the structure of fig. 2 and 3, the circuit board 13 functions to both support the frame 1 and enclose the beam splitter 7 between the frame 1 and the circuit board 13 to protect the beam splitter 7 from environmental factors and light propagating in the beam splitter 7 from overflowing outward. Through the arrangement of the reflector 8 and the photoelectric conversion part 12 in the third direction D3, the length of the frame body 1 in the first direction D1 is saved by changing the direction of the light path, the thickness of the frame body 1 in the third direction D3 is utilized, the installation space occupied by the whole wavelength division multiplexing device is further saved, and more space and freedom degree are provided for the installation of other elements of the optical communication device. The third direction D3 is perpendicular to the first direction D1 and the second direction D2, respectively.
In the wavelength division multiplexing device of the present embodiment, the first connection portion 3 and the third connection portion 5 are fixed on the connection surface 9 of the circuit board 13 by dispensing. In the packaging process, dispensing is firstly carried out at the position for connection in the first connecting part 3 and the third connecting part 5, then the reflector 8 and the photoelectric conversion part 12 are aligned, then the frame body 1 (which is bonded with the emitter 14 and the beam splitter 7 and is integrated with the collimator 6 and the reflector 8) is reversely buckled on the connecting surface 9 of the circuit board 13, the optical fibers of the emitter 14 are led to light, the circuit board 13 is electrified, and the frame body 1 is fixed on the circuit board 13 by dispensing until the response current of the photoelectric conversion part 12 meets the requirement, so that the complete wavelength division multiplexing device with high integration degree and no relative displacement between all components is formed.
Referring to fig. 1 to 4, in the wavelength division multiplexing device of the present embodiment, the collimator 6 is integrally formed on the first connection portion 3, the collimator 6 has a light incident surface 15 and a collimation surface 16 in the first direction D1, and the collimation surface 16 faces the beam splitter 7; the incident light L-in enters the collimator 6 from the light incident surface 15, is collimated by the collimating surface 16 to form a collimated light beam L-co, and then is projected to the beam splitter 7. At this time, the collimator 6 becomes an integral part of the housing 1, and the assembling process of the wavelength division multiplexing device can be completed by only mounting the optical splitter 7 on the second connection part 4 during the assembling, thereby further improving the integration and the assembling efficiency of the wavelength division multiplexing device. The first connection part 3 has a mounting member 17, which mounting member 17 is located at the light entrance surface 15 of the collimator 6, and the external transmitter 14 is butted with the light entrance surface 15 of the collimator 6 by the mounting member 17. The coupling between the external emitter 14 and the collimator 6 is realized by the mounting component 17, so that the connection between the external emitter 14 and the collimator 6 is firmer, the incident optical axis of the external emitter 14 can be aligned with the collimating optical axis of the collimator 6, and the incident light L-in can enter the collimator 6 at normal incidence. In particular, the mounting member 17 may be any securing structure capable of securing the external transmitter 14, including but not limited to a groove-type, hole-type, screw-type structure. In this embodiment, the mounting member 17 is a mounting hole 17, the mounting hole 17 extends along the first direction D1, the light incident surface 15 of the collimator 6 is a bottom of the mounting hole 17 near the second connection portion 4 along the first direction D1, and the axis of the mounting hole 17 is in the same line with the optical axis of the collimator 6. In the structure of fig. 4, the bottom of the mounting hole 17 is the lens surface of the collimator 6, the mounting hole 17 may be a through hole with two ends penetrating through or a concave hole with one end closed, the collimator 6 is only required to be mounted at the bottom of the mounting hole 17 during assembly, and when in use, the emitter 14 (for example, the tail fiber of the optical fiber) serving as an external light source is directly inserted into the mounting hole 17 to the bottom to be butted with the collimator 6, and then is fixed in the mounting hole 17 in a dispensing mode, so that the emitter 14 and the collimator 6 are assembled to form the optical fiber glass collimator. Preferably, the collimator 6 and the first connecting portion 3 are integrally formed in the injection molding process of the frame 1, the mounting hole 17 is formed at the first connecting portion 3 through injection molding by a mold, and meanwhile, the lens surface of the collimator 6 with the collimation function is formed at the bottom of the mounting hole 17, namely, the position and the optical axis of the collimator 6 are fixed in the injection molding process of the frame 1, so that the optical path is shaped, then an external light source is abutted, the incident light L-in is ensured to be injected into the collimator 6, and the integration and the assembly efficiency of the wavelength division multiplexing device are further improved.
With reference to fig. 2 to 4, when assembling the emitter 14 and the collimator 6, a dispensing manner is often adopted more conveniently, but the problem that glue overflows or is excessively used is unavoidable in dispensing, so that the overflowed glue needs to be discharged from the mounting hole 17, so that light propagation can not be affected, and the glue can be reused. Therefore, the inner wall of the mounting hole 17 is provided with an air hole 18, and the air hole 18 is connected to the receiver 2. When the mounting hole 17 is used for mounting an external power supply in a dispensing mode, air can be discharged through the air hole 18, so that the precision and the tightness of the wavelength division multiplexing device are further improved.
Referring to fig. 5 to 7, in the wavelength division multiplexing device of the present embodiment, the optical splitter 7 has a reflecting member 19, an optical guide member 20, and a plurality of filter plates 21; in the first direction D1, the light guide 20 has a light entrance side 22 and a light exit side 23, the light entrance side 22 having a light entrance portion 24 and a light reflecting portion 25, the light entrance portion 24 for receiving the collimated light beam L-co, the light reflecting portion 25 mounting the reflecting member 19, the light exit side 23 mounting the plurality of filter plates 21, the filter plates 21 for transmitting and reflecting light simultaneously; each filter 21 outputs an outgoing light beam L-out, and the outgoing light beam L-out output by a different filter 21 has a different wavelength.
Specifically, the beam splitter 7 is composed of three parts, the reflecting member 19 is a mirror having a reflecting function, the light guiding member 20 is a glass block having a light transmitting function, the plurality of filter plates 21 have a function of being semi-reflective and semi-transmissive and transmitting only light of a specific wavelength, for example, in fig. 5 of the present embodiment, four filter plates 21 can transmit only light of 1270nm,1290nm,1310nm and 1330nm, respectively, and the remaining light is reflected.
By adopting the wavelength division multiplexing device of the embodiment, the characteristic that the filter 21 only transmits light rays with specific wavelengths is adopted, the light rays with different wavelengths in the incident light L-in are separated, and then transmitted to the receiver 2 through different light paths, so that the demultiplexing of the light rays is realized, and further, different electric signals are generated in the receiver 2 through photoelectric conversion.
In the wavelength division multiplexing device of the present embodiment, the light incident side 22 and the light emergent side 23 are parallel to each other, and the interval between the adjacent two filter segments 21 is the same. The light rays reflected by the previous filter 21 in the light path and conducted in the light guide 20 are parallel to each other, and the incident angle when the light rays are incident on the next filter 21 is also ensured to be the same as the incident angle when the light rays are incident on the previous filter 21, so that the plurality of outgoing light beams L-out emitted from the beam splitter 7 are parallel to each other and are in the same outgoing plane.
By adopting the wavelength division multiplexing device of the embodiment, each outgoing beam L-out outgoing from the optical filter is projected onto the reflector 8 in parallel, and then each light spot reflected and converged by the reflector 8 has uniform size and same interval, and the light energy attenuation of each wavelength light received by the receiver 2 is basically the same.
In the wavelength division multiplexing device of the present embodiment, the reflecting surface of the reflector 8 is a biconic surface, and the beam splitter 7 and the receiver 2 are located on both sides of the optical axis of the reflecting surface. The optical axis is a normal line of a reflecting surface in the reflector 8, and as shown in fig. 8 and 9, the biconic surface of the reflector 8 serves as a reflecting surface to collect outgoing beams L-out with corresponding wavelengths from large light spots into small light spots and enter the receiver 2, so that the outgoing beams L-out can be all received by the receiver 2.
In particular, the reflecting surface of the reflector 8 has two implementations, a convex mirror 26 (see fig. 8 and 10) that is convex towards the receiver 2 or a concave mirror 27 (see fig. 9 and 11) that is concave opposite to the receiving surface. The convex mirror 26 and the concave mirror 27 realize a deflection function by changing the propagation direction of light. As shown in fig. 8, when the reflecting surface is the convex mirror 26, the demultiplexed outgoing light beam L-out is changed in propagation direction (deflected by 90 degrees downward) by using the principle of total reflection of light, and at the same time, a converging function is realized, and is projected to the photoelectric conversion element 12 below the reflector 8. The convex mirror 26 has a biconic shape in which the radius of curvature in the X direction is 3.18mm, the conic coefficient in the X direction is-32.2, the radius of curvature in the y direction is 1.68mm, and the conic coefficient in the y direction is-7.39. As shown in fig. 9, when the reflecting surface is a concave mirror 27, the surface thereof is coated with a reflecting film layer, and the demultiplexed outgoing light beam L-out changes the propagation direction (deflects by 90 degrees downward) by reflection of light, and at the same time, realizes a converging function, and is projected to the photoelectric conversion element 12 below the reflector 8. The concave mirror 27 has a biconic shape, a radius of curvature in the X direction of 1.8mm, a conic coefficient of-3.6, a radius of curvature in the y direction of 3.5mm, and a conic coefficient in the y direction of-23.3.
Referring to fig. 10 and 11, in the wavelength division multiplexing device of the present embodiment, the reflector 8 includes a plurality of reflection units 28, the plurality of reflection units 28 being arranged along a second direction D2, the second direction D2 intersecting the first direction D1; the number of the reflecting units 28 is the same as that of the emergent light beams L-out, and each reflecting unit 28 correspondingly receives one emergent light beam L-out; each reflecting element 28 has an angle with the corresponding received outgoing light beam L-out. The plurality of reflection units 28 are located on the exit plane, the second direction D2 is perpendicular to the first direction D1, and the exit beams L-out passing through the beam splitter 7 exit horizontally and propagate vertically downward (i.e. in the third direction D3) into the receiver 2.
Specifically, in terms of structure, the reflector 8 is fabricated on the third connecting portion 5, and is integrally formed with the whole frame body 1 through injection molding, in the injection molding process, an array of a row of reflecting units 28 is formed on the third connecting portion 5 through a mold, and the reflecting units 28 arranged in an array form the reflector 8 together, so that the light path is turned by 90 degrees and the light spots are converged, and the photoelectric conversion part 12 can de-multiplex the light conveniently.
By adopting the wavelength division multiplexing device of the present embodiment, each reflection unit 28 is utilized to reflect the outgoing light beam L-out with a corresponding wavelength to a corresponding position in the receiver 2, so that the outgoing light beam L-out with each wavelength has independent optical paths and is not interfered with each other, the outgoing light beam L-out with each wavelength is deflected by a certain angle by each corresponding reflection unit 28 and then transmitted to the photoelectric conversion element 12 corresponding to each wavelength in the receiver 2, and each photoelectric conversion element 12 transmits and uses the outgoing light beam L-out with each wavelength, thereby playing a role of demultiplexing the incoming light L-in.
The wavelength division multiplexing device of the present embodiment is applied to an optical communication apparatus, and includes a frame 1 (formed by injection molding, and having a reflector 8 integrally formed on the frame 1), a collimator 6 (integrated on the frame 1 formed integrally by injection molding, and capable of directly and fixedly connecting an optical fiber of a transmitter 14, or connecting the optical fiber of the transmitter 14 when in use, the transmitter 14 and the collimator 6 are collectively referred to as an optical fiber collimator 6), a beam splitter 7, the reflector 8, a photoelectric conversion element 12, a circuit board 13, and the like. At the transmitting end of the optical communication device, the transmitter 14 converts various service signals entering the optical communication device into optical signals of different colors, that is, optical signals of different wavelengths, for example, optical wavelengths incident into the optical fiber are 1270nm,1290nm,1310nm and 1330nm, respectively. The optical signals with different wavelengths are combined into a color optical signal, and the color optical signals are transmitted by the same optical fiber. The collimated light beams L-co (including light of a plurality of wavelengths) from the optical fibers of the emitter 14 and passing through the collimator 6 are demultiplexed by the beam splitter 7 to form a plurality of outgoing light beams L-out having different wavelengths, and after each outgoing light beam L-out sequentially passes through the reflector 8 (for example, four reflection units 28 each reflecting light of one wavelength to form four paths), each path turns 90 ° and is changed from the collimated light to converging light, and the converging light is converged onto the photoelectric conversion element 12 at the receiving end, the receiver 2 performs the opposite operation to restore the colored light signals to light signals of different colors, and then generates a current through the photoelectric conversion element 12, thereby realizing conversion of the light signals into electric signals.
The wavelength division multiplexing device of the embodiment adopts an injection molding process to integrate all the components together, and utilizes the integrated reflecting curved mirror array to realize the integrated packaging of the wavelength division multiplexing device and reduce the light attenuation.
In the wavelength division multiplexing device of this embodiment, the glue used for bonding, fixing or connecting the components by dispensing is 353ND or other glue.
The wavelength division multiplexing device disclosed by the embodiment of the application integrates the components such as the collimator, the reflector, the beam splitter and the like in one frame body, so that the packaging among the components is simplified, the production cost is lower, the assembly efficiency is higher, and the integrated reflector is smaller in light energy attenuation compared with the combination of the original right-angle prism and the focusing lens.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (16)
1. A wavelength division multiplexing device, comprising: a frame and a receiver mounted with the frame;
the frame body is provided with a first connecting part, a second connecting part and a third connecting part, and the first connecting part, the second connecting part and the third connecting part are sequentially distributed along a first direction and are integrally formed;
the first connecting part is provided with a collimator, the second connecting part is provided with a beam splitter, the third connecting part is provided with a reflector, and the reflector and the third connecting part are integrally formed;
the collimator receives the incident light and collimates the incident light to form a collimated light beam, the beam splitter receives the collimated light beam and splits the collimated light beam into a plurality of outgoing light beams with different wavelengths, and the reflector receives the plurality of outgoing light beams and reflects and converges the plurality of outgoing light beams to the receiver, respectively.
2. The wavelength division multiplexing device according to claim 1, wherein the collimator is integrally formed with the first connection portion, the collimator having a light entrance surface and a collimation surface in the first direction, the collimation surface facing the beam splitter; the incident light enters the collimator from the light incident surface, is collimated by the collimation surface to form a collimated light beam, and then is projected to the beam splitter.
3. The wavelength division multiplexing device of claim 2, wherein the first connection portion has a mounting member located at the light entrance surface of the collimator, and an external transmitter is butted with the light entrance surface of the collimator through the mounting member.
4. A wavelength division multiplexing device according to claim 3 wherein the mounting member is a mounting hole extending in the first direction, the light incident surface of the collimator is a bottom of the mounting hole near the second connection portion in the first direction, and an axis of the mounting hole is in a same line with an optical axis of the light incident surface.
5. The wavelength division multiplexing device of claim 4, wherein the inner wall of the mounting hole is provided with an air hole, and the air hole is connected with the receiver.
6. The wavelength division multiplexing device of claim 1, wherein the receiver has a connection face that is parallel to the first direction and faces the frame;
the first connecting part and the third connecting part are respectively connected to the connecting surface, an interval is reserved between the second connecting part and the connecting surface, a limiting groove is formed in the surface, facing the connecting surface, of the second connecting part, and the beam splitter is fixed in the limiting groove.
7. The wavelength division multiplexing device according to claim 6, wherein the receiver includes a photoelectric conversion element and a circuit board, the connection face being a surface of the circuit board facing the frame body, the photoelectric conversion element being mounted on the connection face;
the circuit board is connected with the first connecting part and the third connecting part through the connecting surface;
the photoelectric conversion piece is positioned at the light outlet of the reflector.
8. The wavelength division multiplexing device of claim 7, wherein the first connection portion and the third connection portion are respectively fixed on the connection surface by dispensing.
9. The wavelength division multiplexing device of claim 1, wherein the reflecting surface of the reflector is a biconic surface, and the beam splitter and the receiver are located on both sides of the optical axis of the reflecting surface.
10. The wavelength division multiplexing device of claim 9, wherein the reflecting surface is a convex mirror protruding toward the receiver or a concave mirror recessed opposite the receiving surface.
11. The wavelength division multiplexing device of claim 9, wherein the reflector comprises a plurality of reflective elements arranged along a second direction, the second direction intersecting the first direction;
the number of the reflecting units is the same as that of the emergent light beams, and each reflecting unit correspondingly receives one emergent light beam;
each reflecting unit has an included angle with the corresponding received emergent beam.
12. The wavelength division multiplexing device of claim 11, wherein the plurality of outgoing light beams form an outgoing plane, the plurality of reflecting elements are located in the outgoing plane, and the second direction is perpendicular to the first direction.
13. The wavelength division multiplexing device of claim 1, wherein the optical splitter has a reflecting member, an optical guide member, and a plurality of filter plates;
the light guide member is provided with a light inlet side and a light outlet side along the first direction, the light inlet side is provided with a light inlet part and a light reflecting part, the light inlet part is used for receiving the collimated light beam, the light reflecting part is provided with the reflecting member, the light outlet side is provided with the plurality of filter plates, and the filter plates are used for transmitting and reflecting light rays simultaneously;
each filter outputs one emergent light beam, and the wavelengths of the emergent light beams output by different filters are different.
14. The wavelength division multiplexing device of claim 13, wherein the light entrance side and the light exit side are parallel to each other, and a distance between two adjacent filters is the same.
15. An optical converter comprising a transmitter and a wavelength division multiplexing device according to any of claims 1 to 14, the transmitter interfacing with a collimator of the wavelength division multiplexing device.
16. An optical communication device comprising a signal transceiver and the optical converter of claim 15, the optical converter being coupled to the signal transceiver.
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| CN202111284202.XA CN116068700A (en) | 2021-11-01 | 2021-11-01 | Wavelength division multiplexing device |
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| CN202111284202.XA CN116068700A (en) | 2021-11-01 | 2021-11-01 | Wavelength division multiplexing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115308856A (en) * | 2022-08-30 | 2022-11-08 | 苏州伽蓝致远电子科技股份有限公司 | Receiving end assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308856A (en) * | 2022-08-30 | 2022-11-08 | 苏州伽蓝致远电子科技股份有限公司 | Receiving end assembly |
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