CN115314113A - Signal transmission device and communication system - Google Patents
Signal transmission device and communication system Download PDFInfo
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- CN115314113A CN115314113A CN202210808535.6A CN202210808535A CN115314113A CN 115314113 A CN115314113 A CN 115314113A CN 202210808535 A CN202210808535 A CN 202210808535A CN 115314113 A CN115314113 A CN 115314113A
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- 230000008054 signal transmission Effects 0.000 title claims abstract description 56
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
Abstract
The application relates to a signal transmission device and a communication system, wherein the signal transmission device comprises a photoelectric conversion module and an optical fiber coupling module, the photoelectric conversion module comprises a photoelectric driving chip, a light receiving device and a light emitting device, and the optical fiber coupling module comprises a first optical fiber coupler and a second optical fiber coupler; the photoelectric driving chip is respectively connected with the light receiving device and the light emitting device; the photoelectric driving module is used for converting optical signals transmitted by the first optical fibers into electric signals and transmitting the electric signals to the communication terminal, converting the electric signals transmitted by the communication terminal into optical signals and transmitting the optical signals to the second optical fibers, the first optical fiber coupler is used for inserting the first optical fibers, and the second optical fiber coupler is used for inserting the second optical fibers. According to the technical scheme, the conversion between the electric signals and the optical signals is achieved through the photoelectric conversion module, the optical signals obtained through photoelectric conversion are transmitted in a long distance through the optical fibers through the optical fiber coupling module, and compared with the prior art, the cost and the deployment difficulty of the signals in high-speed and long-distance transmission are reduced.
Description
Technical Field
The present application relates generally to the field of communications. More particularly, the present application relates to a signal transmission apparatus and a communication system.
Background
With the development of socioeconomic and scientific technologies, various electronic products are indispensable in daily life of people. In particular, in application scenarios such as aerospace ground test and industrial cameras, electronic products need to be communicatively connected through cables.
Meanwhile, the functions of various electronic systems are increasingly complicated and diversified, communication data among electronic products in each electronic system is increased explosively, and communication standards with high bandwidth and high reliability need to be adopted among the electronic products based on the requirements of synchronous testing, video monitoring, data safety and the like. However, the effective transmission distance of the communication cable during high-speed transmission is usually about several tens of meters, and when each electronic product in an electronic system needs to transmit data over a longer distance, it is currently common to use a repeater or a thicker cable, and these methods all bring about an increase in cost and a drastic increase in deployment difficulty.
Disclosure of Invention
The application provides a signal transmission device and a communication system, which are used for solving the problems of high cost and high deployment difficulty of a communication cable in high-speed and long-distance transmission.
In order to solve the above problems, the present application provides the following technical solutions:
a signal transmission device comprises a photoelectric conversion module and an optical fiber coupling module, wherein the photoelectric conversion module comprises a photoelectric driving chip, a light receiving device and a light emitting device, and the optical fiber coupling module comprises a first optical fiber coupler and a second optical fiber coupler; wherein, the first and the second end of the pipe are connected with each other,
the photoelectric driving chip is respectively connected with the light receiving device and the light emitting device, a light receiving port of the light receiving device corresponds to the first optical fiber coupler, and a light emitting port of the light emitting device corresponds to the second optical fiber coupler; the optical receiving device is used for converting optical signals received by the optical receiving port into electric signals, the photoelectric driving chip is used for converting the electric signals obtained by conversion of the optical receiving device into electric signals meeting a communication protocol of a communication terminal and transmitting the electric signals to the communication terminal, the photoelectric driving chip is also used for converting the electric signals sent by the communication terminal into driving electric signals of the light emitting device, the light emitting device generates optical signals under the driving of the driving electric signals and transmits the optical signals to the optical emitting port, the first optical fiber coupler is used for inserting a first optical fiber and transmits the optical signals transmitted in the first optical fiber to the optical receiving port, and the second optical fiber coupler is used for inserting a second optical fiber and transmits the optical signals of the optical emitting port to the second optical fiber.
In an implementation manner of the embodiment of the present application, the apparatus further includes a signal processing module, where the signal processing module includes a first band pass filter and a second band pass filter; wherein, the first and the second end of the pipe are connected with each other,
the first end of the first band-pass filter is electrically connected with the input/output interface of the signal processing module after being connected with the first end of the second band-pass filter, the input/output interface is connected with the communication terminal through a coaxial cable, and the second end of the first band-pass filter and the second end of the second band-pass filter are both connected with the photoelectric driving chip; the first band-pass filter allows the electric signals obtained by conversion of the photoelectric driving chip to pass and isolates the electric signals sent by the communication terminal, and the second band-pass filter allows the electric signals sent by the communication terminal to pass and isolates the electric signals obtained by conversion of the photoelectric driving chip.
In one implementation manner of the embodiment of the present application, the signal processing module further includes a power supply filter circuit; wherein, the first and the second end of the pipe are connected with each other,
the first end of the power supply filter circuit is connected with the input/output interface, the second end of the power supply filter circuit is connected with the power transmission line, and the power supply filter circuit allows a direct-current power supply signal to pass through and isolates an electric signal obtained by conversion of the photoelectric driving chip and an electric signal sent by the communication terminal.
In one implementation manner of the embodiment of the present application, the signal processing module further includes a first capacitor; wherein the content of the first and second substances,
and the first end of the first band-pass filter is connected with the first end of the second band-pass filter and then connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the input/output interface.
In one implementation of the embodiment of the present application, the power filter circuit includes a first filter circuit and a second filter circuit; wherein the content of the first and second substances,
the first end of the first filter circuit is connected with the input/output interface, the second end of the first filter circuit is connected with the first end of the second filter circuit, the second end of the second filter circuit is connected with the power transmission line, and the first filter circuit and the second filter circuit are used for isolating the electric signal obtained by conversion of the photoelectric driving chip and the electric signal sent by the communication terminal.
In one implementation of the embodiment of the present application, the first filter circuit includes a first inductor, and the second filter circuit includes a second inductor and a first resistor; wherein the content of the first and second substances,
the first end of the first inductor is connected with the input/output interface, the second end of the first inductor is connected with the first end of the second inductor, the second end of the second inductor is connected with the power transmission line, the first resistor is connected with the second inductor in parallel, the first inductor is used for filtering the electric signal obtained by conversion of the photoelectric driving chip, and the second inductor is used for filtering the electric signal sent by the communication terminal.
In an implementation manner of the embodiment of the present application, the first bandpass filter includes a third inductor, a fourth inductor, a fifth inductor, a second capacitor, a third capacitor, and a fourth capacitor, and the second bandpass filter includes a sixth inductor, a seventh inductor, an eighth inductor, a fifth capacitor, a sixth capacitor, and a seventh capacitor; wherein the content of the first and second substances,
one end of the third inductor, the second capacitor, the fourth inductor and the third capacitor which are sequentially connected in series is electrically connected with an input/output interface of the signal processing module, the other end of the third inductor, the second capacitor, the fourth inductor and the third capacitor is connected with the photoelectric driving chip, and the fifth inductor and the fourth capacitor are connected between the common end of the second capacitor and the fourth inductor and the ground wire after being connected in parallel; one end of the sixth inductor, the fifth capacitor, the seventh inductor and the sixth capacitor which are sequentially connected in series is electrically connected with the input/output interface of the signal processing module, the other end of the sixth inductor, the fifth capacitor, the seventh inductor and the sixth capacitor is connected with the photoelectric driving chip, and the eighth inductor and the seventh capacitor are connected between the common end of the fifth capacitor and the seventh inductor and the ground wire after being connected in parallel.
In an implementation manner of the embodiment of the present application, parameters of the third inductor and the fourth inductor are the same, parameters of the second capacitor and the third capacitor are the same, parameters of the sixth inductor and the seventh inductor are the same, and parameters of the fifth capacitor and the sixth capacitor are the same.
In an implementation manner of the embodiment of the present application, the coaxial cable is a coax wires, and the communication terminal is a video signal acquisition card or an industrial camera.
In an implementation manner of the embodiment of the present application, the light receiving device is a photodiode, the light emitting device is a vertical cavity surface emitting laser, the first optical fiber coupler includes a first lens group and a first optical fiber slot, the second optical fiber coupler includes a second lens group and a second optical fiber slot, the first optical fiber is inserted into the first optical fiber slot, and the second optical fiber is inserted into the second optical fiber slot; the first lens group is used for changing the direction of optical signals transmitted in the first optical fiber so as to transmit the optical signals transmitted in the first optical fiber to the light receiving port, and the second lens group is used for changing the direction of the optical signals transmitted by the light emitting port so as to transmit the optical signals transmitted by the light emitting port to the second optical fiber.
A communication system, comprising a host and a device, wherein the host and the device are both connected with the signal transmission device as described in any one of the preceding claims, so as to realize signal transmission between the host and the device.
The application provides a signal transmission device and a communication system, wherein the signal transmission device comprises a photoelectric conversion module and an optical fiber coupling module, the photoelectric conversion module comprises a photoelectric driving chip, a light receiving device and a light emitting device, and the optical fiber coupling module comprises a first optical fiber coupler and a second optical fiber coupler; the photoelectric driving chip is respectively connected with the light receiving device and the light emitting device, a light receiving port of the light receiving device corresponds to the first optical fiber coupler, and a light emitting port of the light emitting device corresponds to the second optical fiber coupler; the receiving optical device is used for converting optical signals received by the receiving optical port into electric signals, the photoelectric driving chip is used for converting the electric signals obtained by conversion of the receiving optical device into electric signals meeting a communication protocol of a communication terminal and transmitting the electric signals to the communication terminal, the photoelectric driving chip is also used for converting the electric signals sent by the communication terminal into driving electric signals of the light-emitting device, the light-emitting device generates optical signals under the driving of the driving electric signals and transmits the optical signals to the receiving optical port, the first optical fiber coupler is used for inserting a first optical fiber and transmits the optical signals transmitted in the first optical fiber to the receiving optical port, and the second optical fiber coupler is used for inserting a second optical fiber and transmits the optical signals of the receiving optical port to the second optical fiber. The technical scheme of this application has realized the conversion between signal of telecommunication and the light signal through photoelectric conversion module, and the light signal who obtains photoelectric conversion through the optical fiber coupling module passes through optic fibre and realizes long distance transmission, and optic fibre itself just satisfies high-speed, long distance transmission's requirement, and this in-process need not thicker communication cable or repeater, compares with prior art, has reduced the cost and the deployment degree of difficulty when signal is high-speed, long distance transmission.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic structural diagram of a signal transmission apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another signal transmission apparatus according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a signal processing module in a signal transmission device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another signal transmission apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a communication system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it should be understood by those skilled in the art that the embodiments described below are some embodiments of the present disclosure, but not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
For ease of understanding, some of the scenarios and basic principles to which this application is applicable will first be described herein.
At present, for a large electronic system requiring high-speed data transmission or other electronic systems requiring high-speed data transmission, such as a ground test system in the field of aerospace, a video acquisition or monitoring system for scientific cameras, industrial cameras, medical images, and the like, and other common machine vision systems, long-distance transmission between electronic products in the electronic system is required besides the requirement of high bandwidth. Correspondingly, the effective transmission distance of a general communication cable during high-speed transmission is usually about several tens of meters, and for example, an industrial camera applying the CoaXPress protocol can only use a cable smaller than 15m at the highest speed. In response to this requirement, when each electronic product in an electronic system needs to transmit data over a longer distance, it is currently common to use a repeater or a thicker cable, and these methods all bring about an increase in cost and a drastic increase in deployment difficulty.
In view of the above scenario of high bandwidth and long-distance transmission requirement, a technical solution that can realize long-distance transmission at low cost without affecting wiring deployment is urgently needed. Based on this, the present application utilizes the characteristics that optical fibers can realize high bandwidth and long-distance transmission of optical signals, converts electrical signals carrying specific information (such as video data, control instructions, etc.) to be transmitted by each sending device in an electronic system into optical signals, then realizes long-distance transmission in the optical fibers, and converts the optical signals back into electrical signals when the signals are transmitted to a receiving device.
Having described the basic principles of the present application, various non-limiting embodiments of the present application are described in detail below. Any number of elements in the drawings are by way of example and not by way of limitation, and any nomenclature is used solely for differentiation and not by way of limitation.
Fig. 1 is a schematic structural diagram of a signal transmission device disclosed in an embodiment of the present application. The signal transmission device shown in fig. 1 includes a photoelectric conversion module 1 and an optical fiber coupling module 2. The photoelectric conversion module 1 includes a photoelectric driving chip 11, a light receiving device 12 and a light emitting device 13, and the optical fiber coupling module 2 includes a first optical fiber coupler 21 and a second optical fiber coupler 22.
The photoelectric driving chip 11 is respectively connected with the light receiving device 12 and the light emitting device 13, a light receiving port of the light receiving device 12 corresponds to the first optical fiber coupler 21, and a light emitting port of the light emitting device corresponds to the second optical fiber coupler 22. The light receiving device 12 is configured to convert an optical signal received by a light receiving port of the light receiving device 12 into an electrical signal, the photoelectric driving chip 11 is configured to convert the electrical signal obtained by conversion of the light receiving device 1 into an electrical signal meeting a communication protocol of a communication terminal and transmit the electrical signal to the communication terminal (not shown in fig. 1), the photoelectric driving chip 11 is further configured to convert the electrical signal sent by the communication terminal into a driving electrical signal of the light emitting device 13, and the light emitting device 13 generates an optical signal under the driving of the driving electrical signal and transmits the optical signal to a light emitting port of the light emitting device 13. It should be noted that the reason why the photoelectric driving chip 11 converts the electrical signal converted by the light receiving device 1 into an electrical signal satisfying the communication protocol of the communication terminal, and converts the electrical signal sent by the communication terminal into a driving electrical signal of the light emitting device 13 is that: the electrical signal satisfying the communication protocol of the communication terminal is generally different from the electrical signal converted by the light receiving device 1 in signal form, and the electrical signal transmitted by the communication terminal is different from the driving electrical signal of the light emitting device 13 in signal form. Generally, the electrical signal satisfying the communication protocol of the communication terminal and the electrical signal transmitted by the communication terminal are digital signals, the electrical signal converted by the light receiving device 1 and the driving electrical signal of the light emitting device 13 are analog signals, and parameters such as signal amplitude of each signal may be different in a specific scene. The processes of digital-to-analog conversion, analog-to-digital conversion, filtering, and the like, which need to be performed in the conversion process between the analog signal and the digital signal, can be referred to in the prior art, and are not described herein again.
The first optical fiber coupler 21 is used for plugging a first optical fiber 23 and transmitting an optical signal transmitted in the first optical fiber 23 to a light receiving port of the light receiving device 12, and the second optical fiber coupler 22 is used for plugging a second optical fiber 24 and transmitting an optical signal of a light emitting port of the light emitting device 13 to the second optical fiber 24. The light receiving port of the light receiving device 12 corresponds to the first optical fiber coupler 21, that is, the relative position between the light receiving port of the light receiving device 12 and the first optical fiber coupler 21 enables the optical signal transmitted in the first optical fiber 23 to be directly or indirectly transmitted to the light receiving port of the light receiving device 12, and the light emitting port of the light emitting device 13 corresponds to the second optical fiber coupler 22, that is, the relative position between the light emitting port of the light emitting device 13 and the second optical fiber coupler 22 enables the optical signal of the light emitting port to be directly or indirectly transmitted to the second optical fiber 24. In the process of signal transmission, the photoelectric conversion module converts an electric signal into an optical signal, and the optical fiber coupling module couples and transmits the optical signal output by the photoelectric conversion module and the optical fiber through the optical fiber jumper.
It should be noted that, in practical applications, electronic products/communication terminals in electronic systems are usually in two-way communication, for example, in an industrial camera scene, a video signal acquisition card needs to send a control instruction to an industrial camera, the industrial camera needs to send video data to the video signal acquisition card, in a laser radar test scene, a laser radar needs to send a detection signal to a radar simulator, and the radar simulator needs to send a target simulation signal to the laser radar. Correspondingly, the communication terminal in the embodiment of the present application may be any communication device or electronic product that needs to communicate in an electronic system, and when communication is needed between two communication terminals, each communication terminal needs to be connected to the signal transmission device in the embodiment of the present application. What is different is that in the process of transmitting the same path of signal (such as uplink signal or downlink signal), one of the two corresponding signal transmission devices performs conversion from the electrical signal to the optical signal, and the other performs conversion from the optical signal to the electrical signal. For example, when the video signal acquisition card sends a control instruction to the industrial camera, the signal transmission device connected with the video signal acquisition card converts an electric signal into an optical signal, and the signal transmission device connected with the industrial camera converts the optical signal into an electric signal. It will be appreciated that although both communication terminals which need to communicate need to be connected to a signal transmission means, the two signal transmission means need not be identical, since the signals transmitted by the two communication terminals are different, and the two communication terminals themselves have their own characteristics.
In addition, the communication terminal in the embodiment of the present application refers to an electronic product that needs to perform communication in an electronic system, for example, in an industrial camera data acquisition scene, electronic devices used for communication are a video signal acquisition card and an industrial camera, respectively. Generally, for an electronic system having a control relationship such as data acquisition, one end having a control function is referred to as a host end, and the other end is referred to as an equipment end.
The signal transmission device provided by the embodiment of the application comprises a photoelectric conversion module and an optical fiber coupling module, wherein the photoelectric conversion module comprises a photoelectric driving chip, a light receiving device and a light emitting device, and the optical fiber coupling module comprises a first optical fiber coupler and a second optical fiber coupler; the photoelectric driving chip is respectively connected with the light receiving device and the light emitting device, a light receiving port of the light receiving device corresponds to the first optical fiber coupler, and a light emitting port of the light emitting device corresponds to the second optical fiber coupler; receive optical device and be used for receiving the optical signal conversion of light mouth and become the signal of telecommunication, photoelectric drive chip is used for receiving the signal of telecommunication conversion that optical device conversion obtained and is satisfied communication terminal communication protocol's the signal of telecommunication and transmit for communication terminal, photoelectric drive chip still is used for converting the signal of telecommunication that communication terminal sent into light emitting device's drive signal of telecommunication, light emitting device produces light signal and transmits for the light mouth under the drive of drive signal of telecommunication, first fiber coupler is used for the first optic fibre of cartridge, and transmit the light signal of transmission in first optic fibre for receiving the light mouth, second fiber coupler is used for cartridge second optic fibre, and transmit the light signal of light mouth to the second optic fibre. The technical scheme of this application has realized the conversion between signal of telecommunication and the light signal through photoelectric conversion module, and the light signal who obtains photoelectric conversion through the optical fiber coupling module passes through optic fibre and realizes long distance transmission, and optic fibre itself just satisfies high-speed, long distance transmission's requirement, and this in-process need not thicker communication cable or repeater, compares with prior art, has reduced the cost and the deployment degree of difficulty when signal is high-speed, long distance transmission.
The inventor discovers that in the process of implementing the application: in some scenarios, when data transmission is performed between communication terminals, especially when data transmission is performed by using a coaxial cable, mutual interference may occur between uplink signals and downlink signals. For this purpose, referring to fig. 2, in an implementation manner of the embodiment of the present application, the signal processing module 3 is further included, and the signal processing module 3 includes a first band pass filter 31 and a second band pass filter 32.
Specifically, a first end of the first band-pass filter 31 is connected with a first end of the second band-pass filter 32 and then electrically connected with an input/output interface of the signal processing module 3, the input/output interface is connected with a communication terminal through a coaxial cable, and a second end of the first band-pass filter 31 and a second end of the second band-pass filter 32 are both connected with the optoelectronic driving chip 11; the first band-pass filter 31 allows the electric signal converted by the optoelectronic driving chip 11 to pass and isolates the electric signal sent by the communication terminal, and the second band-pass filter 32 allows the electric signal sent by the communication terminal to pass and isolates the electric signal converted by the optoelectronic driving chip 11. The input/output interface may be a connector in a specific expression form, and may be one of connectors such as a BNC (Bayonet Neill-Concelman, nieer-cornsman Bayonet) connector, a Micro-BNC connector, a DIN connector, and the like. The uplink signal, the downlink signal, the direct current signal (which is not necessary and is needed when power needs to be supplied to the passive device) and the like transmitted between the communication devices are acquired through the connector.
In this embodiment, the first bandpass filter 31 isolates the electrical signal transmitted by the communication terminal, thereby ensuring the stability of the output of the signal processing module 3 from the photo-electric driver chip 11. Correspondingly, the second band-pass filter 32 isolates the electrical signal to be output to the communication terminal by the photo-electric driving chip 11, so as to prevent the electrical signal output by the photo-electric driving chip 11 from being received by the photo-electric driving chip 11 itself.
In an actual electronic system, not every electronic product in the electronic system has a power supply, and in this scenario, the electronic product needs to supply power to other electronic products. In this case, in order to avoid the influence of the signal link on the power supply link, a filter circuit is required to isolate signals (such as an uplink signal and a downlink signal) of the signal link so as to extract the power supply signal output by the communication terminal, and for this reason, in an implementation manner of the embodiment of the present application, the signal processing module further includes a power supply filter circuit 33.
The first end of the power filter circuit 33 is connected to the input/output interface, the second end of the power filter circuit 33 is connected to the power transmission line, and the power filter circuit 33 allows the dc power signal to pass through and isolates the electrical signal converted by the optical-electrical driver chip 11 from the electrical signal sent by the communication terminal.
It can be understood that, in the case of signal transmission between active electronic products in an electronic system or in the case of no power signal transmission between other electronic products, since no power signal transmission is required, there is no need to arrange a power filter circuit for response and a corresponding power transmission line. Since it is not necessary to arrange a power transmission line and a power filter circuit, the EMI (Electromagnetic Interference) performance of a signal transmission path of an electronic system is improved.
The inventor discovers that in the process of implementing the application: although the first band pass filter 31 and the second band pass filter 32 have a certain filtering effect on the dc power signal, the dc power signal still has an influence on the electrical signal transmission of the signal link under some working conditions, and stability and accuracy of the signal are affected. Based on this, in one implementation manner of the embodiment of the present application, the signal processing circuit 3 further includes a first capacitor 34.
A first end of the first band-pass filter 31 is connected to a first end of the second band-pass filter 32 and then to a first end of a first capacitor 34, and a second end of the first capacitor is connected to the input/output interface.
In this embodiment, the first capacitor 34 is disposed in front of the first band pass filter 31 and the second band pass filter 32, so that the dc power signal is filtered, and the signal transmission influence of the dc power signal on the signal transmission link is avoided.
Through the arrangement of the first band-pass filter 31, the second band-pass filter 32, the power supply filter circuit 33 and the first capacitor 34, the first band-pass filter 31 isolates signals output by the communication terminal, so as to avoid affecting the stability of an output interface of the photoelectric conversion module; the second band-pass filter 32 isolates the signal output by the photoelectric conversion module, so that the signal of the photoelectric conversion module is prevented from being received by the photoelectric conversion module; the power filter module 33 extracts the dc power signal input to the signal processing module by the communication terminal, or the dc power signal output to the passive communication terminal by the signal processing module, from the signal link, and then couples the signal to the power transmission path; the first capacitor blocks redundant DC power signals on the signal link. Therefore, the signal processing module distinguishes and divides the uplink signal, the downlink signal, power supply and the like acquired through the input and output interface so as to facilitate the processing of the photoelectric conversion module.
In one implementation of the embodiment of the present application, the power supply filter circuit 33 includes a first filter circuit and a second filter circuit. Specifically, a first end of the first filter circuit is connected to the input/output interface, a second end of the first filter circuit is connected to a first end of the second filter circuit, a second end of the second filter circuit is connected to the power transmission line, and the first filter circuit and the second filter circuit are configured to isolate the electrical signal obtained by the conversion of the photoelectric driving chip 11 from the electrical signal sent by the communication terminal.
It can be understood that, in actual implementation, the first filter circuit may be used to filter the electrical signal converted by the electro-optical driving chip 11, the second filter circuit may be used to filter the electrical signal sent by the communication terminal, the second filter circuit may also be used to filter the electrical signal converted by the electro-optical driving chip 11, and the first filter circuit is used to filter the electrical signal sent by the communication terminal.
It should be noted that: the power filter circuit may have other expressions, for example, the power filter circuit may further include a third filter circuit in addition to the first filter circuit and the second filter circuit, and the third filter circuit may filter out non-dc power signals that cannot be filtered by the first filter circuit and the second filter circuit.
In one implementation of the embodiments of the present application, the first filter circuit includes a first inductor, and the second filter circuit includes a second inductor and a first resistor. Specifically, a first end of the first inductor is connected to the input/output interface, a second end of the first inductor is connected to a first end of the second inductor, a second end of the second inductor is connected to the power transmission line, the first resistor is connected to the second inductor in parallel, the first inductor is configured to filter the electrical signal converted by the photoelectric driving chip 11, and the second inductor is configured to filter the electrical signal sent by the communication terminal. The first resistor and the second inductor form a loop at the power-off moment to consume the induction voltage generated at the power-off moment.
As shown in fig. 3, in one implementation manner of the embodiment of the present application, the first band-pass filter 31 includes a third inductor 311, a fourth inductor 313, a fifth inductor 315, a second capacitor 312, a third capacitor 314, and a fourth capacitor 316, and the second band-pass filter 32 includes a sixth inductor 321, a seventh inductor 323, an eighth inductor 326, a fifth capacitor 322, a sixth capacitor 324, and a seventh capacitor 326.
Specifically, one end of the third inductor 311, the second capacitor 312, the fourth inductor 313 and the third capacitor 314, which are sequentially connected in series, is electrically connected to the input/output interface of the signal processing module 3, the other end of the third inductor is connected to the photoelectric driving chip 11, and the fifth inductor 316 and the fourth capacitor 315 are connected in parallel and then connected between the common end of the second capacitor 312 and the fourth inductor 313 and the ground line; one end of the sixth inductor 321, the fifth capacitor 322, the seventh inductor 323 and the sixth capacitor 324 which are sequentially connected in series is electrically connected to the input/output interface of the signal processing module 3, the other end of the sixth inductor is connected to the photoelectric driving chip 11, and the eighth inductor 326 and the seventh capacitor 326 are connected in parallel and then connected between the common end of the fifth capacitor 322 and the seventh inductor 323 and the ground line.
In practical application, values of the third inductor 311, the fourth inductor 313, the fifth inductor 315, the second capacitor 312, the third capacitor 314, the fourth capacitor 316, the sixth inductor 321, the seventh inductor 323, the eighth inductor 326, the fifth capacitor 322, the sixth capacitor 324, and the seventh capacitor 326 may be obtained through simulation of existing simulation software, may be obtained through theoretical calculation, or may be an empirical value. By selecting proper capacitance and inductance, the first band-pass filter 31 has high impedance to the output signal of the communication device and low impedance to the input signal of the communication device, and the second band-pass filter 32 has low impedance to the input signal of the photoelectric conversion module 1 to the communication terminal and low impedance to the output signal of the communication device. When coax cables as in the examples of the present application are coax cables, in some embodiments, the third inductor is in the order of 0.1-1 nanohenries, the fourth inductor is in the order of 0.1-1 nanohenries, the fifth inductor is in the order of 1-5 nanohenries, the second capacitor is in the order of 1-2 picofarads, the third capacitor is in the order of 1-2 picofarads, and the fourth capacitor is in the order of 0.1-1 picofarads. The sixth inductor adopts a 50-100 nanohenry level, the seventh inductor adopts a 50-100 nanohenry level, the eighth inductor adopts a 200-1000 nanohenry level, the fifth capacitor adopts a 100-500 picofarad level, the sixth capacitor adopts a 100-500 picofarad level, and the seventh capacitor adopts a 10-100 picofarad level. The inventor finds in the process of implementing the application that the selection standard can better realize the filtering and isolation of the uplink signal and the downlink signal during the signal transmission between the video signal acquisition card and the industrial camera.
In addition, in some embodiments, the parameters of the third inductor 311 and the fourth inductor 313 may be the same, the parameters of the second capacitor 312 and the third capacitor 314 may be the same, the parameters of the sixth inductor 321 and the seventh inductor 323 may be the same, and the parameters of the fifth capacitor 322 and the sixth capacitor 324 may be the same. On one hand, the inventor finds that better filtering effect can be achieved by the selection of the capacitor and the inductor in the process of realizing the application, and on the other hand, the types of the capacitor and the inductor are reduced. It should be understood that, in practical applications, the parameters of the third inductor 311 and the fourth inductor 313 may not be the same, the parameters of the second capacitor 312 and the third capacitor 314 may not be the same, the parameters of the sixth inductor 321 and the seventh inductor 323 may not be the same, and the parameters of the fifth capacitor 322 and the sixth capacitor 324 may not be the same, as long as the corresponding bandpass filtering functions are satisfied.
In practical applications, the first band pass filter 31 and the second band pass filter may be other band pass filters, such as a band pass filter composed of a common RLC circuit, in addition to the embodiment shown in fig. 3.
In an implementation manner of the embodiment of the present application, the coaxial cable is a coax wires, and the communication terminal is a video signal acquisition card or an industrial camera.
CoaXPress is an asymmetric high-speed serial communication standard of a coaxial cable, and is a digital interface specification developed specially for the machine vision industry. The specification specifies the use of a single coaxial cable for high speed downstream signal transmission, low speed upstream signal transmission and power supply for industrial cameras for the system. Specifically, when the video signal acquisition card communicates with the industrial camera, the video signal acquisition card sends a low-speed uplink signal to the industrial camera for controlling the industrial camera and the like, and the industrial camera sends a high-speed uplink signal such as acquired video data to the video acquisition card.
In one implementation manner of the embodiment of the present application, the light receiving device is a photodiode, and the light emitting device is a vertical cavity surface emitting laser. Because the optical signals corresponding to the photodiode and the vertical cavity surface emitting laser are generally perpendicular to the board surface of the printed circuit board and are inconsistent with the optical signal transmission direction of the optical fiber, at this time, a corresponding lens group needs to be arranged to change the optical signal emitted by the first optical fiber and the direction of the optical signal emitted by the light emitting device.
Specifically, referring to fig. 4, the first optical fiber coupler 21 includes a first lens group 211 and a first optical fiber slot 212, the second optical fiber coupler 22 includes a second lens group 221 and a second optical fiber slot 222, the first optical fiber 23 is inserted into the first optical fiber slot 212, and the second optical fiber 24 is inserted into the second optical fiber slot 222; the first lens group 211 is used for changing the direction of the optical signal transmitted in the first optical fiber 23 to transmit the optical signal transmitted in the first optical fiber 23 to the light receiving port, and the second lens group 221 is used for changing the direction of the optical signal emitted from the light emitting port to transmit the optical signal emitted from the light emitting port to the second optical fiber 24. In practical application, the lens group may be a reflecting mirror, the optical fiber is inserted into the optical fiber slot of the optical fiber coupler and fixed by dispensing, so that the optical fiber is in good contact with the lens group of the optical fiber coupler, and then the optical fiber coupling module is butted with the photoelectric conversion module, so as to ensure that the first lens group is aligned with the light receiving port and the second lens group is aligned with the light emitting port.
Corresponding to the embodiments of the signal transmission device, the embodiment of the application further discloses a communication system, which comprises a host and a device, wherein the host and the device are both connected with the signal transmission device as described in any one of the above embodiments, so as to realize the signal transmission between the host and the device.
Specifically, as shown in fig. 5, the host 51 is connected to the signal transmission device 52 through a cable, the device 54 is connected to the signal transmission device 53 through a cable, and the signal transmission device 52 is connected to the signal transmission device 53 through a first optical fiber and a second optical fiber. The host 51 and the device 54 are electronic products that need to communicate with each other in the communication system, and the specific representation of the signal transmission apparatus can be referred to the description in the foregoing embodiments, and will not be described herein again.
It should be noted that, in order to realize the signal transmission, the signal transmission device 52 and the signal transmission device 53 should be referred to as "disposed", specifically, when the signal converted from the electrical signal to the optical signal in the signal transmission device 52 is transmitted to the signal transmission device 53, the optical signal is converted to the electrical signal, and when the signal converted from the electrical signal to the optical signal in the signal transmission device 53 is transmitted to the signal transmission device 52, the optical signal is converted to the electrical signal.
The application provides a communication system, which comprises a host and equipment, wherein the host and the equipment are both connected with a signal transmission device. The signal transmission device comprises a photoelectric conversion module and an optical fiber coupling module, wherein the photoelectric conversion module comprises a photoelectric driving chip, a light receiving device and a light emitting device, and the optical fiber coupling module comprises a first optical fiber coupler and a second optical fiber coupler; the photoelectric driving chip is respectively connected with the light receiving device and the light emitting device, a light receiving port of the light receiving device corresponds to the first optical fiber coupler, and a light emitting port of the light emitting device corresponds to the second optical fiber coupler; the optical receiving device is used for converting optical signals received by the optical receiving port into electric signals, the photoelectric driving chip is used for converting the electric signals obtained by conversion of the optical receiving device into electric signals meeting a communication protocol of a communication terminal and transmitting the electric signals to the communication terminal, the photoelectric driving chip is also used for converting the electric signals sent by the communication terminal into driving electric signals of the light emitting device, the light emitting device generates optical signals under the driving of the driving electric signals and transmits the optical signals to the optical receiving port, the first optical fiber coupler is used for inserting the first optical fiber and transmits the optical signals transmitted in the first optical fiber to the optical receiving port, and the second optical fiber coupler is used for inserting the second optical fiber and transmits the optical signals of the optical receiving port to the second optical fiber. According to the technical scheme, conversion between the electric signals and the optical signals is achieved through the photoelectric conversion module, the optical signals obtained through photoelectric conversion are transmitted in a long distance through the optical fibers through the optical fiber coupling module, the optical fibers meet the requirements of high-speed and long-distance transmission, thicker communication cables or repeaters are not needed in the process, and compared with the prior art, the cost and the deployment difficulty of the signals in high-speed and long-distance transmission are reduced.
In light of the foregoing description of the present specification, those skilled in the art will also understand that terms used herein, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "central," "longitudinal," "transverse," "clockwise," or "counterclockwise," etc., indicate that such terms are based on the orientations or positional relationships illustrated in the drawings of the present specification, which are intended for purposes of convenience in describing the concepts of the present application and simplifying the description, and are not intended to indicate or imply that the device or element involved must have the particular orientation, be constructed and operated in the particular orientation, and thus such terms are not to be understood or interpreted as limiting the scope of the present application.
In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "plurality" means at least two, for example, two, three or more, and the like, unless explicitly defined otherwise.
While various embodiments of the present application have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present application. It should be understood that various alternatives to the embodiments of the application described herein may be employed in practicing the application. The following claims are intended to define the scope of the application and, accordingly, to cover module compositions, equivalents, or alternatives falling within the scope of these claims.
Claims (10)
1. A signal transmission device is characterized by comprising a photoelectric conversion module and an optical fiber coupling module, wherein the photoelectric conversion module comprises a photoelectric driving chip, a light receiving device and a light emitting device, and the optical fiber coupling module comprises a first optical fiber coupler and a second optical fiber coupler; wherein, the first and the second end of the pipe are connected with each other,
the photoelectric driving chip is respectively connected with the light receiving device and the light emitting device, a light receiving port of the light receiving device corresponds to the first optical fiber coupler, and a light emitting port of the light emitting device corresponds to the second optical fiber coupler; the optical receiving device is used for converting optical signals received by the optical receiving port into electric signals, the photoelectric driving chip is used for converting the electric signals obtained by conversion of the optical receiving device into electric signals meeting a communication protocol of a communication terminal and transmitting the electric signals to the communication terminal, the photoelectric driving chip is also used for converting the electric signals sent by the communication terminal into driving electric signals of the light emitting device, the light emitting device generates optical signals under the driving of the driving electric signals and transmits the optical signals to the optical emitting port, the first optical fiber coupler is used for inserting a first optical fiber and transmits the optical signals transmitted in the first optical fiber to the optical receiving port, and the second optical fiber coupler is used for inserting a second optical fiber and transmits the optical signals of the optical emitting port to the second optical fiber.
2. The apparatus of claim 1, further comprising a signal processing module comprising a first band pass filter and a second band pass filter; wherein the content of the first and second substances,
the first end of the first band-pass filter is electrically connected with the input/output interface of the signal processing module after being connected with the first end of the second band-pass filter, the input/output interface is connected with the communication terminal through a coaxial cable, and the second end of the first band-pass filter and the second end of the second band-pass filter are both connected with the photoelectric driving chip; the first band-pass filter allows the electric signals obtained by conversion of the photoelectric driving chip to pass through and isolates the electric signals sent by the communication terminal, and the second band-pass filter allows the electric signals sent by the communication terminal to pass through and isolates the electric signals obtained by conversion of the photoelectric driving chip.
3. The apparatus of claim 2, wherein the signal processing module further comprises a power filter circuit; wherein the content of the first and second substances,
the first end of the power supply filter circuit is connected with the input/output interface, the second end of the power supply filter circuit is connected with the power transmission line, and the power supply filter circuit allows a direct-current power supply signal to pass through and isolates an electric signal obtained by conversion of the photoelectric driving chip and an electric signal sent by the communication terminal.
4. The apparatus of claim 3, wherein the signal processing module further comprises a first capacitor; wherein the content of the first and second substances,
and the first end of the first band-pass filter is connected with the first end of the second band-pass filter and then connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the input/output interface.
5. The apparatus of claim 3, wherein the power supply filtering circuit comprises a first filtering circuit and a second filtering circuit; wherein, the first and the second end of the pipe are connected with each other,
the first end of the first filter circuit is connected with the input/output interface, the second end of the first filter circuit is connected with the first end of the second filter circuit, the second end of the second filter circuit is connected with the power transmission line, and the first filter circuit and the second filter circuit are used for isolating the electric signal obtained by conversion of the photoelectric driving chip and the electric signal sent by the communication terminal.
6. The apparatus of claim 5, wherein the first filter circuit comprises a first inductor, wherein the second filter circuit comprises a second inductor and a first resistor; wherein the content of the first and second substances,
the first end of the first inductor is connected with the input/output interface, the second end of the first inductor is connected with the first end of the second inductor, the second end of the second inductor is connected with the power transmission line, the first resistor is connected with the second inductor in parallel, the first inductor is used for filtering the electric signal obtained by conversion of the photoelectric driving chip, and the second inductor is used for filtering the electric signal sent by the communication terminal.
7. The apparatus according to any one of claims 2 to 6, wherein the first band-pass filter comprises a third inductor, a fourth inductor, a fifth inductor, a second capacitor, a third capacitor and a fourth capacitor, and the second band-pass filter comprises a sixth inductor, a seventh inductor, an eighth inductor, a fifth capacitor, a sixth capacitor and a seventh capacitor; wherein, the first and the second end of the pipe are connected with each other,
one end of the third inductor, the second capacitor, the fourth inductor and the third capacitor which are sequentially connected in series is electrically connected with an input/output interface of the signal processing module, the other end of the third inductor is connected with the photoelectric driving chip, and the fifth inductor and the fourth capacitor are connected in parallel and then connected between the common end of the second capacitor and the fourth inductor and a ground wire; one end of the sixth inductor, the fifth capacitor, the seventh inductor and the sixth capacitor which are sequentially connected in series is electrically connected with the input/output interface of the signal processing module, the other end of the sixth inductor, the fifth capacitor, the seventh inductor and the sixth capacitor is connected with the photoelectric driving chip, and the eighth inductor and the seventh capacitor are connected between the common end of the fifth capacitor and the seventh inductor and the ground wire after being connected in parallel.
8. The apparatus of claim 7, wherein the third inductor and the fourth inductor have the same parameters, wherein the second capacitor and the third capacitor have the same parameters, wherein the sixth inductor and the seventh inductor have the same parameters, and wherein the fifth capacitor and the sixth capacitor have the same parameters.
9. The apparatus according to any one of claims 2 to 6, wherein the coaxial cable is a CoaXPres cable, and the communication terminal is a video signal acquisition card or an industrial camera.
10. A communication system, comprising a host and a device, wherein the host and the device are connected with the signal transmission apparatus according to any one of claims 1 to 9, so as to realize signal transmission between the host and the device.
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