CN114236716A - Single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device and manufacturing method thereof - Google Patents
Single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device and manufacturing method thereof Download PDFInfo
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- CN114236716A CN114236716A CN202210183856.1A CN202210183856A CN114236716A CN 114236716 A CN114236716 A CN 114236716A CN 202210183856 A CN202210183856 A CN 202210183856A CN 114236716 A CN114236716 A CN 114236716A
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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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- 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
- G02B6/4274—Electrical aspects
- G02B6/428—Electrical aspects containing printed circuit boards [PCB]
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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
- G02B6/4295—Coupling light guides with opto-electronic elements coupling with semiconductor devices activated by light through the light guide, e.g. thyristors, phototransistors
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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
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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Abstract
The application discloses a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device and a manufacturing method, and particularly relates to the technical field of information transmission, wherein the device comprises a PCBA: the PCBA comprises a circuit board, a light splitter, a dielectric thin film filter, a laser and a photodiode; the circuit board is provided with a conversion area; the area shape of the conversion area is an equilateral polygon, and the middle points of the N +1 sides of the equilateral polygon are sequentially connected according to a first turning direction to obtain an auxiliary polygon, wherein the auxiliary polygon is provided with N non-hollow angles and a hollow angle; a dielectric thin film filter is arranged on the non-hollow angle; the laser and the photodiode are respectively arranged on two auxiliary extension lines passing through the dielectric thin film filter along a first direction; the beam splitter is arranged on the hollow corner of the auxiliary polygon. The single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device is based on a novel photoelectric bidirectional conversion structure constructed by a TFT, and can realize a bidirectional wavelength division multiplexing function in a compact volume.
Description
Technical Field
The invention belongs to the technical field of information transmission, and particularly relates to a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device and a manufacturing method thereof.
Background
With the increasing transmission capacity in the communication field, it is difficult for the conventional transmission technology to meet the requirements of transmission capacity and transmission speed. At present, data centers, business applications and homes have higher and higher bandwidth requirements, and applications are diversified. The optical-to-electrical conversion device is a main component of equipment for realizing optical communication, and in some application occasions, it is desirable to realize the same function by using one optical fiber, for example, increasing the bandwidth under the condition that the wiring of a data center is not changed, so the wavelength division multiplexing technology is an effective solution.
The thin film filter technology is the wavelength division multiplexing technology that has been used for the earliest time in wavelength division multiplexing, and the main advantage of the thin film filter is its extremely high accuracy in application to small-sized devices, as compared with other technologies.
Fig. 1 is a schematic view showing a structure of a conventional wavelength division multiplexing device based on a thin film filter (TFT). Referring to fig. 1 of the drawings, a glass carrier 111 is taken as a base, a plurality of pairs of coating films 113 with different separation wavelengths are sequentially arranged below two surfaces of the glass carrier, each pair of coating films 113 only allows optical signals in a specific wavelength range to transmit, and optical signals with other wavelengths are directly reflected on a coating layer 113; in connection with the illustrated schematic structure, the position of each sub-plating layer 113 is arranged based on the relationship of the incident angle and the exit angle at the time of light reflection, so that the incident light can pass through each sub-plating layer in turn. Correspondingly, a photoelectric conversion receiver 112 for receiving optical signals is arranged on one side of each secondary plating layer far away from the glass carrier 111, and signals in each wavelength range in the light can be read through the embodiment, so that corresponding information can be acquired.
In the single-fiber bidirectional multimode wavelength division multiplexing direction, the TFT wavelength division multiplexing device having the structure shown in fig. 1 has a biggest problem of position interference between the photoelectric conversion receiver 112 and the photoelectric conversion transmitter, and in combination with the schematic structure shown in fig. 1, due to the position limitation, the photoelectric conversion receiver 112 and the photoelectric conversion transmitter cannot be compactly arranged together, so that in order to implement single-fiber bidirectional wavelength division multiplexing, two TFT wavelength division multiplexing devices need to be arranged for signal reception and signal transmission, and the size of the TFT wavelength division multiplexing device cannot meet the requirement of a miniature device; in addition, the number of parts used by the two TFT wavelength division multiplexing devices is large, which is not favorable for reducing the manufacturing cost of the TFT wavelength division multiplexing devices.
Disclosure of Invention
In order to meet the requirement of single-fiber bidirectional multimode wavelength division multiplexing of a microminiature device, the invention provides a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device.
Correspondingly, the invention provides a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device, which comprises a PCBA, an optical fiber connector and an electric connector, wherein the PCBA comprises a circuit board, an optical splitter, a dielectric thin film filter, a laser and a photodiode, the electric connector and the optical fiber connector are respectively arranged on the circuit board, and each laser and each photodiode are respectively and electrically connected with the electric connector through the circuit board;
the number of the dielectric thin film filters is N, the number of the lasers is N, the number of the photodiodes is N, and N is a positive integer greater than 2; the circuit board is provided with a conversion area, the area shape of the conversion area is an equilateral polygon with N +1 sides, the middle points of the N +1 sides of the equilateral polygon are sequentially connected according to a first turning direction to obtain an auxiliary polygon, and the auxiliary polygon is provided with N non-hollow angles and a hollow angle;
each non-hollow angle of the auxiliary polygon is provided with one dielectric thin film filter, and the front surface of each dielectric thin film filter faces to the center of the auxiliary polygon;
two ends of each sideline on the auxiliary polygon are respectively extended outwards to form a plurality of auxiliary extension lines; for any one of the N dielectric thin film filters, one laser and one photodiode are respectively and sequentially arranged on two auxiliary extension lines passing through the dielectric thin film filter along the first direction;
the optical splitter is arranged on the hollow angle and is provided with two output ends and an input end, the input end is communicated with the optical fiber connector, the two output ends are respectively positioned on two side lines of the hollow angle, or the two output ends are respectively positioned on auxiliary extension lines of the two side lines of the hollow angle.
In an optional embodiment, the PCBA includes a rotating structure, and the rotating structure includes a cylinder main body and two limiting pieces respectively located at two ends of the cylinder main body;
the circuit board is provided with a through hole matched with the cylindrical main body, the cylindrical main body is matched in the through hole, and the two limiting pieces are respectively attached to two opposite surfaces of the circuit board;
the optical splitter, the N dielectric thin film filters, the N lasers and the N photodiodes are respectively arranged on the rotating structural member;
and a plurality of groups of contact sets are arranged on the surface of one side of the limiting sheet facing the circuit board.
In an optional embodiment, the dielectric thin film filter comprises a rigid lens and a coating processed on the surface of the rigid lens;
the rigid lens is fixed on the rotating structural part.
In an alternative embodiment, the number of contact sets is two or more, each contact set having connection contacts corresponding to the number of N lasers and N photodiodes;
and the connecting contacts in each group of contact groups are electrically connected with the N lasers and the N photodiodes on the basis of a connecting circuit of a preset structure.
In an alternative embodiment, the optical splitter comprises a main body and two columns;
a light guide channel is arranged in the light splitter, one end of the light guide channel is an input end of the light splitter, and the other end of the light guide channel is branched into two output ends;
each upright post is of a cylindrical structure, the bottom of each upright post is fixed on the rotating structural part, and the two leading-out ends are respectively opposite to the tops of the two upright posts;
the surface of each upright post is provided with a working surface, and the working surface is the output end of the light splitter;
the upright post is internally provided with a reflector opposite to the working surface.
In an alternative embodiment, an optical lens is disposed on the top of each of the pillars.
In an alternative embodiment, the optical lens is screw-fitted on the inner wall of the corresponding pillar.
In an optional embodiment, the electrical connector is an HDMI interface.
In an optional embodiment, the power supply device further includes an auxiliary power supply interface, and the auxiliary power supply interface is disposed on the circuit board.
Correspondingly, the invention provides a manufacturing method of the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device, which is used for the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device.
To sum up, the embodiment of the present invention provides a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device and a manufacturing method thereof, the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device has a specially configured dielectric thin film filter structure, avoids layout interference between optical signal receiving equipment and optical signal transmitting equipment, can realize a receiving function and a sending function of an optical signal in the same set of dielectric thin film filter, and has good implementation convenience for a tiny device; the setting amount of the dielectric thin film filter is reduced through the multiplexing of the dielectric thin film filter, the problem of poor products caused by the superposition of errors can be avoided, and the manufacturing cost of the device is reduced; the arrangement of the rotating structural part can improve the stability of the structure of the optical path transmission part in the product, avoid assembly errors caused by assembly and improve the processing yield of the product; in addition, the arrangement of different connecting lines on the rotary structural member can solve the problem of the synchronization rate of signal transmission, and has important adjusting and optimizing significance for the implementation mode of the same electric connector for transmitting different signal lines in a wavelength division multiplexing mode.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification of the application, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic view showing a structure of a conventional wavelength division multiplexing device based on a thin film filter (TFT).
Fig. 2 is a schematic three-dimensional structure diagram of a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to an embodiment of the present invention.
Fig. 3 is a schematic three-dimensional structure diagram of a rotating structural member according to an embodiment of the present invention.
Fig. 4 is a schematic top perspective view of a rotational structural member according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a three-dimensional structure of a circuit board according to an embodiment of the invention.
Detailed Description
For the purpose of promoting a clear understanding of the objects, aspects and advantages of the embodiments of the present application, reference will now be made to the accompanying drawings and detailed description, wherein like reference numerals refer to like elements throughout.
The illustrative embodiments and descriptions of the present application are provided to explain the present application and not to limit the present application. Additionally, the same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.
As used herein, "first," "second," …, etc., are not specifically intended to mean in a sequential or chronological order, nor are they intended to limit the application, but merely to distinguish between elements or operations described in the same technical language.
With respect to directional terminology used herein, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be illustrative and is not intended to be limiting of the present teachings.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
As used herein, "and/or" includes any and all combinations of the described items.
References to "plurality" herein include "two" and "more than two"; reference to "multiple sets" herein includes "two sets" and "more than two sets".
As used herein, the terms "substantially", "about" and the like are used to modify any slight variation in quantity or error that does not alter the nature of the variation. In general, the range of slight variations or errors that such terms modify may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. It should be understood by those skilled in the art that the aforementioned values can be adjusted according to actual needs, and are not limited thereto.
Certain words used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present application.
Fig. 2 is a schematic three-dimensional structure diagram of a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to an embodiment of the present invention.
The embodiment of the invention provides a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device, which comprises a PCBA, an optical fiber connector 4 and an electric connector 1.
Specifically, the PCBA is a generic term for the entirety of the circuit board 7 and its upper components. In the embodiment of the invention, the PCBA comprises the circuit board 7, the optical splitter 51, N dielectric thin film filters 56, N lasers 57 and N photodiodes 58, wherein N is a positive integer greater than 2.
The electrical connector 1 and the optical fiber connector 4 are respectively disposed on the circuit board 7, specifically, the circuit board 7 refers to that the electrical connector 1 and the optical fiber connector 4 are fixed by using the circuit board 7 as a carrier, specifically, the electrical connector 1 and the optical fiber connector 4 may be directly disposed on the circuit board 7, or may be disposed on the circuit board 7 by using a corresponding connection structure.
A conversion area is arranged on the circuit board 7; the transition area is the name of an area on the circuit board 7 that does not have a boundary where a physical entity exists.
Specifically, the N lasers 57 and the N photodiodes 58 are electrically connected to the electrical connector 1 through the circuit board 7, respectively; specifically, the laser 57 is used for converting an electrical signal transmitted by the electrical connector 1 into an optical signal output, and the photodiode 58 is used for converting an optical signal from the outside into an electrical signal transmitted by the electrical connector 1.
Specifically, the area shape of the transition region is an equilateral polygon 71 with N +1 sides, and the outline of the transition region is illustrated in the figure as a solid outline.
The middle points of the N +1 sides of the equilateral polygon 71 are sequentially connected according to a first turning direction (i.e., clockwise or counterclockwise, in the present embodiment, clockwise) to obtain an auxiliary polygon 72, and the outline of the auxiliary polygon 72 is illustrated by a solid outline in the drawing.
Specifically, the auxiliary polygon has N non-null angles and one null angle.
Each non-hollow corner of the auxiliary polygon 72 is provided with one dielectric thin film filter 56, and the front face of each dielectric thin film filter 56 faces the center of the auxiliary polygon 72; specifically, the front surface of the dielectric thin film filter 56 is a working surface of the dielectric thin film filter 56, and the dielectric thin film filter 56 is provided with a coating film of a special structure on the front surface, which can transmit light of a specific wavelength band and reflect light of the remaining wavelength bands.
Specifically, two ends of each side line of the auxiliary polygon 72 respectively extend outwards to form a plurality of auxiliary extension lines 73, and the auxiliary extension lines 73 are shown by dotted lines in fig. 3.
Specifically, for any one dielectric thin film filter 56 of the N dielectric thin film filters 56, one laser 57 and one photodiode 58 are respectively disposed on two auxiliary extension lines 73 passing through the dielectric thin film filter 56 in sequence along the first direction; according to a first direction of rotation, a first auxiliary extension 73 is provided with one of said lasers 57 and a second auxiliary extension 73 is provided with one of said photodiodes 58.
In particular, the auxiliary polygon 72 has a free corner, i.e., a free angle. The beam splitter 51 is disposed at a hollow corner of the auxiliary polygon 72 where the dielectric thin film filter 56 is not disposed.
Specifically, the optical splitter 51 has two output ends and an input end 69, the input end is communicated with the optical fiber connector 4, the two output ends are respectively located on two side lines of the hollow angle, or the two output ends are respectively located on auxiliary extension lines 73 of the two side lines of the hollow angle. It should be noted that the designations of the output terminal and the input terminal do not indicate the input terminal and the output terminal which are constantly optical signals, and the designations of the output terminal and the input terminal only indicate that in the structure of the optical splitter 51, the optical splitter 51 has three connection terminals, and in essence, the three connection terminals are mutually conducted. In the embodiment of the present invention, one of the two output ends of the optical splitter 51 is an optical signal return end, and the other is an optical signal output end, and the input end of the optical splitter 51 is an input-output multiplexing end.
Specifically, in the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device provided in the embodiment of the present invention, the auxiliary polygon 72 may be an optical signal transmission path inside the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device, and by disposing the dielectric thin film filter 56 at an angle of the regular polygon and leaving one angle of the regular polygon to be disposed for the optical splitter 51, the reversibility of the optical path is utilized to realize transmission and reception of an optical signal; in addition, regarding the spatial layout of the components, the included angle between the group of lasers 57 and the photodiode 58 corresponding to each dielectric thin film filter 56 is at least over 60 degrees, so that the problem of position interference between the lasers 57 and the photodiodes 58 can be avoided in the spatial layout, the function of multiplexing the dielectric thin film filters 56 is realized, the purpose of bidirectional multimode wavelength division multiplexing communication is achieved, and the volume of the device is saved.
Fig. 3 shows a three-dimensional structural diagram of the rotational structural member 5 according to the embodiment of the present invention, and fig. 4 shows a top perspective structural diagram of the rotational structural member 5 according to the embodiment of the present invention.
Further, the PCBA comprises a rotating structural member 5, and the rotating structural member 5 comprises a cylinder main body 59 and two limiting pieces 60 respectively located at two ends of the cylinder main body 59; the circuit board 7 is provided with a through hole which is matched with the cylinder main body 59.
The cylinder main body 59 is fitted in the through hole, and the two limiting pieces 60 are respectively attached to two opposite surfaces of the circuit board 7, that is, the rotating structural member 5 is rotatably clamped on the circuit board 7.
The optical splitter 51, the N dielectric thin film filters 56, the N lasers 57, and the N photodiodes 58 are respectively disposed on the rotating structural member 5.
A plurality of sets of contact sets 61 are disposed on the surface of the limiting sheet 60 facing the circuit board 7, and the N lasers 57 and the N photodiodes 58 are electrically connected to the circuit board 7 based on the contact sets 61, respectively.
Specifically, the purpose of the arrangement of the rotating structural member 5 is mainly to arrange the optical splitter 51 and the N dielectric thin film filters 56 related to optical path transmission in the rotating structural member 5, and in specific implementation, the support structures of the optical splitter 51 and the dielectric thin film filters 56 and the rotating structural member 5 can be integrally injection-molded, so that the requirement of structural precision is met, and the position accuracy of the parts related to optical path transmission is ensured.
Furthermore, the rotating structure of the rotating structure 5 facilitates the access of the optical fiber 3.
Further, the dielectric thin film filter 56 includes a rigid lens 55 and a coating film processed on the surface of the rigid lens 55; the rigid lens 55 is fixed to the rotating structural part 5. During processing, the rigid lens 55 can be fixed on the rotating structural member 5 and then processed in a film coating manner, so that the film coating processing can be ensured to be in the last step instead of the transferred step, the film coating can be protected, and the damage of the film coating can be avoided.
Further, the number of the contact sets 61 is two or more, and each contact set 61 has connection contacts corresponding to the number of the N lasers 57 and the N photodiodes 58; the connection contacts in each contact set 61 are electrically connected to the N lasers 57 and the N photodiodes 58 based on a connection line of a predetermined structure.
Specifically, the N lasers 57 and the N photodiodes 58 are electrically connected to the connection contacts of the contact set 61, respectively, and since the optical signals are transmitted step by step along the first direction, correspondingly, the transmission and the reception of the optical signals have a certain time difference, and in addition, differences exist between individuals of different lasers 57 and between individuals of different photodiodes 58, so that the difference of signal transmission speeds caused by the above reasons is reduced by the design differences of different connection lines in the embodiment of the present invention, so as to obtain the best signal transmission effect.
Specifically, different connection lines have different lengths of line lengths for different lines, and in specific implementations, different contact sets 61 can be connected to corresponding electrical connection structures 81 of the circuit board 7 by rotating the rotating structure 5.
Fig. 5 shows a schematic three-dimensional structure diagram of the circuit board 7 according to the embodiment of the present invention, and with reference to fig. 3, in fig. 3, since the dotted line area 52 shields the pillar structure, the dotted line area 52 is hidden, and in actual implementation, the pillar is wrapped in the main body of the optical splitter 51, and only the area right opposite to the working surface of the pillar is communicated with the outside.
Correspondingly, in order to limit the movement of the rotating structural member 5 to a certain extent and prevent the electric connection structure from being separated, a clamping groove 80 is arranged on the circuit board 7, and the rotating structural member 5 can be provided with a corresponding protruding structure for clamping, so that the electric connection structure is positioned.
Further, the optical splitter 51 includes a main body and two columns; a light guide channel 70 is arranged in the optical splitter 51, one end of the light guide channel is an input end of the optical splitter 51, and the other end of the light guide channel is branched into two output ends; each upright post is of a cylindrical structure, the bottom of each upright post is fixed on the rotating structural part 5, and the two leading-out ends are respectively opposite to the tops of the two upright posts; the surface of each upright post is provided with a working surface, and the working surface is the output end of the light splitter 51; the upright post is internally provided with a reflector opposite to the working surface. Specifically, the mirror acts to turn the optical signal by 90 degrees for transmission and reception of the optical signal.
Further, in order to ensure the transmission quality of the optical signals, an optical lens 55 is disposed at the top of each of the columns, and the optical lens 55 is used for focusing the optical signals, so that the signals are more concentrated in the transmission process. In order to insert the lens 55, a through hole may be provided in the body directly above the pillar, and the through hole may be closed after the lens 55 is mounted.
Further, the inside of stand can be provided with helicitic texture, and the mode that lens 55 accessible screw-thread fit set up is installed in the stand to be convenient for the adjustment of lens 55's position.
Further, the electrical connector 1 is an HDMI interface. It should be specially noted that, specifically, for the application of the wavelength division multiplexing technology, a commonly used means in the prior art is to apply the wavelength division multiplexing to multiple devices, that is, the multiple devices distinguish signal characteristics by wavelength ranges to achieve the purpose of wavelength division multiplexing, but in the embodiment of the present invention, the transmission problem of different signal lines of the same interface is handled in a wavelength division multiplexing manner, and therefore, the embodiment of the present invention needs to pay more attention to the transmission synchronization problem of signals.
Further, for the electrical connector 1 without an electrical power structure, the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device further includes an auxiliary power supply interface 6, and the auxiliary power supply interface 6 is disposed on the circuit board 7 and is used for supplying power to the electrical components and the electrical modules in the circuit board 7.
Correspondingly, the embodiment of the invention also provides a manufacturing method of the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device, which is used for manufacturing the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device.
Specifically, in the method for manufacturing a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to the embodiment of the present invention, the processing steps to be emphasized include:
the rotating structural part 5 and the support structures of the dielectric thin film filter 56, the rotating structural part 5 and the beam splitter 51 on the rotating structural part 5 are prepared on the basis of an integral forming mode, and in actual implementation, the rotating structural part 5 should be further provided with a positioning structure of a laser 57 and a photodiode 58;
the dielectric thin film filter 56 is processed in such a way that the rigid glass is fixed on the rotating structural member 5 and then is subjected to film coating operation;
after the support structure of the spectrometer 51 is formed, copper plating is required in the internal channel structure.
The body immediately above the column is provided with a through hole, and the through hole is closed after the lens 55 is mounted.
To sum up, it should be noted first that the laser 57 and the photodiode 58 corresponding to each dielectric thin film filter 56 are respectively disposed in sequence along the first direction, so that according to the first direction, the two columns are respectively the optical signal emitting column 54 and the optical signal receiving column 53 in sequence; when the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device receives optical signals, the optical fiber 3 is connected to the main body 51 through the optical fiber 3 connecting piece, the optical signals are focused through the lens 55 and then focused on the reflector of the optical signal transmitting upright post 54 and then emitted through the working surface, and according to the transmission sequence of the first direction, the signals in different wavelength ranges are sequentially received by the photodiodes 58 behind the different dielectric thin film filters 56, converted into electric signals and transmitted to the HDMI interface; when the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device of the embodiment of the invention transmits externally, after receiving a transmission signal from an HDMI interface, the laser 57 is reflected by a plurality of layers of dielectric thin film filters 56 or directly received by a working surface of the optical signal receiving upright column 53, and then transmitted to the outside through the optical fiber 3; during the above-mentioned operation of the device, the auxiliary power supply interface 6 supplies power to the relevant equipment through the power supply line 2.
Compared with the prior art, in order to implement single-fiber bidirectional wavelength division multiplexing, the prior art needs to provide two TFT wavelength division multiplexing devices for receiving and transmitting signals, on one hand, the size of the TFT wavelength division multiplexing device cannot meet the requirement of a miniature device, and on the other hand, the number of used components is large. For example, in the prior art, if one TFT wavelength division multiplexing device processes optical signals with 10 wavelengths, the TFT wavelength division multiplexing device needs 10 layers of coating films (equivalent to 10 dielectric thin film filters), and two TFT wavelength division multiplexing devices need to be used for signal transmission and reception, that is, 20 layers of coating films (equivalent to 20 dielectric thin film filters) are needed; in the embodiment of the invention, based on the reversibility of the optical path, by utilizing the signal processing characteristics of the dielectric film filters, one dielectric film filter simultaneously realizes the functions of receiving, separating, sending and converging optical signals, only 10 dielectric film filters are needed to complete the functions which can be realized by 20 dielectric film filters in the prior art, and the effect of saving the number of parts is achieved; in addition, two TFT wavelength division multiplexing devices for signal transmission and reception are integrated into one wavelength division multiplexing photoelectric conversion device, so that compared with the prior art, the requirement of a miniature device can be met.
To sum up, the embodiment of the present invention provides a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device and a manufacturing method thereof, the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device has a specially configured dielectric thin film filter 56 structure, avoids layout interference between optical signal receiving equipment and optical signal transmitting equipment, can realize the receiving function and the transmitting function of optical signals in the same set of dielectric thin film filter 56, and has good implementation convenience for tiny devices; by multiplexing the dielectric thin film filter 56, the setting amount of the dielectric thin film filter 56 is reduced, the problem of poor products caused by the superposition of errors can be avoided, and the manufacturing cost of the device is reduced; the arrangement of the rotating structural part 5 can improve the stability of the structure of the optical path transmission part in the product, avoid assembly errors caused by assembly and improve the processing yield of the product; in addition, the arrangement of different connection lines on the rotary structural member 5 can solve the problem of the synchronization rate of signal transmission, and has important adjusting and optimizing significance for the implementation mode of the same electric connector 1 which transmits different signal lines in a wavelength division multiplexing mode.
The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for the purpose of helping those skilled in the art understand the present invention, and is not to be construed as limiting the scope of the present invention. Various modifications, equivalent changes, etc. made by those skilled in the art under the spirit of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. A single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device comprises a PCBA, an optical fiber connector and an electric connector, wherein the PCBA comprises a circuit board, an optical splitter, a dielectric thin film filter, lasers and photodiodes, the electric connector and the optical fiber connector are respectively arranged on the circuit board, and each laser and each photodiode are respectively electrically connected with the electric connector through the circuit board;
the number of the dielectric thin film filters is N, the number of the lasers is N, the number of the photodiodes is N, and N is a positive integer greater than 2; the circuit board is provided with a conversion area, the area shape of the conversion area is an equilateral polygon with N +1 sides, the middle points of the N +1 sides of the equilateral polygon are sequentially connected according to a first turning direction to obtain an auxiliary polygon, and the auxiliary polygon is provided with N non-hollow angles and a hollow angle;
each non-hollow angle of the auxiliary polygon is provided with one dielectric thin film filter, and the front surface of each dielectric thin film filter faces to the center of the auxiliary polygon;
two ends of each sideline on the auxiliary polygon are respectively extended outwards to form a plurality of auxiliary extension lines; for any one of the N dielectric thin film filters, one laser and one photodiode are respectively and sequentially arranged on two auxiliary extension lines passing through the dielectric thin film filter along the first direction;
the optical splitter is arranged on the hollow angle and is provided with two output ends and an input end, the input end is communicated with the optical fiber connector, the two output ends are respectively positioned on two side lines of the hollow angle, or the two output ends are respectively positioned on auxiliary extension lines of the two side lines of the hollow angle.
2. The single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to claim 1, wherein the PCBA comprises a rotational structural member, the rotational structural member comprising a cylindrical body and two position-limiting pieces respectively located at two ends of the cylindrical body;
the circuit board is provided with a through hole matched with the cylindrical main body, the cylindrical main body is matched in the through hole, and the two limiting pieces are respectively attached to two opposite surfaces of the circuit board;
the optical splitter, the N dielectric thin film filters, the N lasers and the N photodiodes are respectively arranged on the rotating structural member;
and a plurality of groups of contact sets are arranged on the surface of one side of the limiting sheet facing the circuit board.
3. The single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to claim 2, wherein the dielectric thin film filter comprises a rigid lens and a coating film formed on a surface of the rigid lens;
the rigid lens is fixed on the rotating structural part.
4. The single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to claim 2, wherein the number of the contact groups is two or more, each contact group having connection contacts corresponding to the number of the N lasers and the N photodiodes;
and the connecting contacts in each group of contact groups are electrically connected with the N lasers and the N photodiodes on the basis of a connecting circuit of a preset structure.
5. The single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to claim 2, wherein the optical splitter comprises a main body and two posts;
a light guide channel is arranged in the light splitter, one end of the light guide channel is an input end of the light splitter, and the other end of the light guide channel is branched into two output ends;
each upright post is of a cylindrical structure, the bottom of each upright post is fixed on the rotating structural part, and the two leading-out ends are respectively opposite to the tops of the two upright posts;
the surface of each upright post is provided with a working surface, and the working surface is the output end of the light splitter;
the upright post is internally provided with a reflector opposite to the working surface.
6. The device according to claim 5, wherein an optical lens is disposed on a top of each of the pillars.
7. The single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to claim 6, wherein the optical lens is screw-fitted on an inner wall of the corresponding pillar.
8. The single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to claim 1, wherein the electrical connector is an HDMI interface.
9. The device according to claim 1, further comprising an auxiliary power supply interface disposed on the circuit board.
10. A method for manufacturing a single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device, characterized by being used for manufacturing the single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device according to any one of claims 1 to 9.
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| CN114236716B (en) | 2022-05-17 |
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