CN109495728B - Optical fiber transmission system and transmission method - Google Patents

Abstract

The invention provides an optical fiber transmission system and an optical fiber transmission method. The system includes an optical fiber transmission medium, a sending device and a receiving device. The sending device is used for downlinking a data signal and a SerTFG serial communication signal conforming to the Base mode in the Camera Link protocol. The transmission coding is used to obtain the first downlink signal; the sending device is further configured to symmetrically decode the first uplink signal. The receiving device is not only used to symmetrically decode the first downlink signal, but also to perform uplink transmission coding on the camera control signal and the SerTC serial communication signal in the Base mode in the Camera Link protocol, so as to obtain the first uplink signal; The downlink signal and the first uplink signal are transmitted through the optical fiber transmission medium. The optical fiber transmission system of the invention has good versatility, strong long-distance transmission capability, high anti-interference capability, convenient installation and use, and low bit error rate.

Description

Optical fiber transmission system and transmission method

technical field

The invention relates to the technical field of optical fiber transmission, and in particular, to an optical fiber transmission system and a transmission method.

Background technique

There is a flaw in the combination of the Camera Link protocol and optical fiber communication in the prior art. Taking the optical fiber transmission system based on the standard Base mode Camera Link interface in the prior art as an example, the optical fiber transmission system can only transmit the data of a specific type of camera. Image data can either only transmit image data of a type of camera with a fixed resolution and fixed frame rate, or can only transmit part of the image data in the Camera Link protocol, and the control signals and asynchronous communication signals in the protocol must be transmitted separately. Either only a fixed baud rate asynchronous communication signal can be transmitted. It is also because the optical fiber transmission system based on the standard Base mode Camera Link interface in the prior art can only select one for data transmission. Therefore, although the optical fiber transmission system based on the standard Base mode Camera Link interface realizes the transmission of image data, the products are universal. Performance and comprehensive performance are particularly poor.

Further, if you want to solve the problem of long-distance transmission of high-bandwidth signals in complex electromagnetic environments in the industrial field, then multiple auxiliary systems must be required to work together with the optical fiber transmission system based on the standard Base mode Camera Link interface, which will be very important. It greatly increases the cost and complexity of signal transmission.

SUMMARY OF THE INVENTION

In order to solve the problems of poor general performance and poor comprehensive performance of optical fiber transmission products based on the standard Base mode Camera Link interface, the present invention provides an optical fiber transmission system, which includes an optical fiber transmission medium, and also includes:

The sending device is used to perform downlink transmission coding on the data signal and the SerTFG serial communication signal in the Base mode in the Camera Link protocol to obtain the first downlink signal; the sending device is also used to symmetric the first uplink signal decoding;

The receiving device is not only used to symmetrically decode the first downlink signal, but also used to perform uplink transmission coding on the camera control signal and the SerTC serial communication signal in the Base mode in the Camera Link protocol, so as to obtain the first downlink signal. an uplink signal;

The first downlink signal and the first uplink signal are transmitted through the optical fiber transmission medium.

Preferably, the sending device includes a first main controller and a first photoelectric conversion module connected to each other;

The first main controller is used to perform protocol coding on the downlink data signal in the Base mode in the Camera Link protocol and the designated behavior in the SerTFG serial communication signal to obtain the first protocol packet, and the designated behavior includes the frame start. , one or more of frame end, frame valid, frame blanking, line start, line end, line valid and line blanking states; the first main controller communicates with the first GTX transceiver integrated in it. The K code is inserted into the first protocol packet, and the first GTX transceiver performs 8B/10B encoding on the first protocol packet after the K code is inserted to obtain a downlink differential signal; the downlink differential signal is transmitted by the first host. The controller transmits to the first photoelectric conversion module;

The first main controller also symmetrically decodes the upstream differential signal through the first GTX transceiver integrated therein, so as to obtain the upstream camera control signal and the SerTC serial communication signal from the second protocol packet.

Preferably, the sending device includes an input module, a decoding module, the first main controller and the first photoelectric conversion module connected in sequence;

The input module is arranged between the industrial camera and the decoding module, and the input module is used for downlink transmission of the LVDS signal from the industrial camera;

The decoding module is arranged between the input module and the first main controller, and the decoding module is used to convert the LVDS signal from the industrial camera into a data signal and a Base mode conforming to the Camera Link protocol. SerTFG serial communication signal, and continue to downlink the signal to the first main controller;

The decoding module will also perform the first LVDS encoding on the upstream camera control signal and the SerTC serial communication signal from the first main controller, and the decoding module will transmit the encoded signal via the first LVDS to the An input module, the input module can continue to transmit the signal encoded by the first LVDS to the industrial camera.

Preferably, the receiving device includes a second main controller and a second photoelectric conversion module connected to each other;

The second photoelectric conversion module is used to convert the optical signal from the sending device back to a downlink differential signal, and send it to the second main controller; the second photoelectric conversion module is also used to convert the first The uplink differential signal generated by the two main controllers is converted into an optical signal sent to the transmitting device;

The second main controller is used to perform self-defined protocol encoding on the upstream camera control signal and SerTC serial communication signal in the Base mode in the Camera Link protocol, so as to obtain the third protocol package; the second main controller passes the Its internal integrated second GTX transceiver performs 8B/10B encoding on the third protocol packet to obtain uplink differential signals;

The second main controller also symmetrically decodes the downlink differential signal from the sending device through the second GTX transceiver to obtain downlink data signals and SerTFG serial communication signals.

Preferably, the receiving device comprises an output module, an encoding module, the second main controller and the second photoelectric conversion module connected in sequence;

The output module is arranged between the encoding module and the image acquisition device, and the output module is used for downlink transmission of the second LVDS encoded signal from the encoding module to the image acquisition device; the output module also for transmitting the upstream LVDS signal from the image acquisition device to the encoding module;

The encoding module is arranged between the output module and the second main controller, and the encoding module is used to convert the upstream LVDS signal from the image acquisition device into a signal that conforms to the Base mode in the Camera Link protocol. The upstream camera control signal and the SerTC serial communication signal, and continue to transmit the signal upstream to the second main controller;

The encoding module also performs second LVDS encoding on the downstream data signal and the SerTFG serial communication signal from the second main controller, and the encoding module transmits the signal via the second LVDS encoding to the output module.

Preferably, the data signal conforming to the Base mode in the Camera Link protocol includes a 28bits data signal, the 28bits data signal includes a 4bits video control signal and a 24bits image data signal, and the 4bits video control signal is an FVAL signal respectively. , LVAL signal, DVAL signal and SPARE signal; the 24bits image data signal is PORTA signal, PORTB signal and PORTC signal, and the 24bits image data signal is transmitted through 3 ports.

Preferably, both the transmitting device and the receiving device are provided with a photoelectric conversion module, and the photoelectric conversion module includes a transceiver integrated optical fiber module with an SFP or SFP+ interface; the optical fiber transmission medium is single-mode or multi-mode. optical fiber.

Preferably,

The transmitting device and the receiving device are respectively provided with a first main controller and a second controller, and the first main controller and the second controller are XC7K70T/XC7A50T main control chips, and may also be Xilinx The company's 7 series FPGA;

The decoding module on the sending device is a DS90CR288A decoding chip, and the encoding module on the receiving device is a DS90CR287 encoding chip.

The present invention also provides a kind of optical fiber transmission method, it is characterized in that, it comprises uplink transmission and downlink transmission, and described downlink transmission comprises the following steps:

Step S1, carry out self-defined protocol encoding to the downlink data signal and SerTFG serial communication signal in the Base mode in the Camera Link protocol to obtain the first protocol packet;

Step S2, inserting the K code into the first protocol packet, and then performing 8B/10B encoding to obtain a downlink 1lane high-speed differential signal, and then the downlink 1lane high-speed differential signal is converted into optical signal transmission;

Step S3, decoding the optical signal according to a decoding method symmetric to steps S1 to S2;

The uplink transmission includes the following steps:

Step S4, performing self-defined protocol encoding on the upstream camera control signal and the SerTC serial communication signal in the Base mode in the Camera Link protocol to obtain a third protocol packet;

Step S5, 8B/10B encoding is performed on the third protocol packet to obtain an upstream 1lane high-speed differential signal, and then the upstream 1lane high-speed differential signal is converted into an optical signal for transmission;

In step S6, the optical signal is decoded according to a decoding method symmetric to steps S4 to S5.

Preferably, the self-defined protocol encoding process is to perform one or more of frame start, frame end, frame valid, frame blanking, line start, line end, line valid and line blanking states on the signal. Customize the protocol encoding process.

Compared with the prior art, the beneficial effects of the present invention are:

The present invention provides an optical fiber transmission system and an optical fiber transmission method, wherein the image data of any resolution and frame frequency under the Base mode of the Camera Link protocol can be adaptively encoded through the downlink transmission encoding process, thereby increasing the versatility of the system . Further, through the upstream transmission encoding process, the camera control signal of the arbitrary waveform and the SerTC of the arbitrary baud rate in the Base mode of the Camera Link protocol can be adaptively encoded, which also expands the versatility of the system. In addition, the system transmits through optical fiber, so the system has strong long-distance transmission ability, high anti-interference ability, easy installation and use, and the bit error rate is lower than 10E-12, which meets the industrial-grade operating temperature requirements of -45℃～85℃.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of an optical fiber transmission system in an embodiment of the present invention;

2 is a schematic structural diagram of a sending device of an optical fiber transmission system in an embodiment of the present invention;

3 is a schematic structural diagram of a receiving device of an optical fiber transmission system in an embodiment of the present invention;

FIG. 4 is a flowchart of an optical fiber transmission method in an embodiment of the present invention.

Reference number:

Sending device 1, optical fiber transmission medium 2, receiving device 3, power supply device 4, optical fiber transmission system 10, input module 11, decoding module 12, first main controller 13, first photoelectric conversion module 15, first GTX transceiver 16 , an output module 31 , an encoding module 32 , a second main controller 33 , a second photoelectric conversion module 35 , a second GTX transceiver 36 , an industrial camera 100 and an image acquisition device 200 .

Detailed ways

The above and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientation or positional relationship indicated by "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the indicated device or element must have a specific orientation, construction and operation in a particular orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two unless expressly and specifically defined otherwise.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between the two components, unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Example

FIG. 1 is a schematic structural diagram of an optical fiber transmission system in an embodiment of the present invention; FIG. 2 is a structural schematic diagram of a transmitting device of an optical fiber transmission system in an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a receiving device of the optical fiber transmission system in an embodiment of the present invention .

As shown in FIG. 1 to FIG. 3, Embodiment 1 of the present invention provides an optical fiber transmission system 10. The optical fiber transmission system 10 is an optical fiber transmission system based on a standard Base mode Camera Link interface. The distance transmission comes from the image data of the standard Base mode Camera Link interface, which avoids the problem that the Camera Link data line cannot realize the long-distance transmission of image data.

The optical fiber transmission system 10 includes a transmitting device 1, an optical fiber transmission medium 2 and a receiving device 3. The transmitting device 1 and the receiving device 3 are respectively provided with photoelectric conversion modules. The receiving device 3 is connected to both.

In this embodiment of the present invention, the signal transmitted in the direction from the transmitting device 1 to the receiving device 3 is called the downlink transmission signal, and the signal in the opposite transmission direction is the uplink transmission signal.

Embodiment 1 of the present invention provides an optical fiber transmission system 10 that transmits image data to a distance that is positively correlated with the power of the photoelectric conversion module selected for use. Image data transmission distance can reach kilometer level. The optical fiber communication rate of the optical fiber transmission system 10 is up to 6.6 Gbps, and the communication bit error rate is lower than 10E-12.

Preferably, the sending device 1 is a sending device based on the standard Base mode Camera Link protocol, and the receiving device 3 is a receiving device based on the standard Base mode Camera Link protocol;

Optical fiber transmission medium 2 uses single-mode/multi-mode fiber with LC interface (but not limited to single-mode fiber with LC interface), and the beneficial effect of using single-mode/multi-mode fiber with LC interface is: Modular fiber is made using the modular jack latch mechanism, so it is suitable for connecting SFP modules, and it is easy to operate and has a good transmission effect.

Both the transmitting device 1 and the receiving device 3 are powered by a 4 to 14V DC power supply, which is conducive to the coordinated power supply of the power supply devices and reduces power consumption.

Further, Embodiment 1 of the present invention provides an optical fiber transmission system 10, which further includes a power supply device 4, and the power supply device 4 converts the 4 to 14V voltage supplied from the DC power supply terminal to drive the corresponding active element. In this embodiment, the power supply device 4 is preferably an LTM6446 power supply module (but not limited to this type of power supply module).

Before specifically describing the optical fiber transmission system provided in Embodiment 1 of the present invention, it is necessary to introduce some contents of the CameraLink standard, especially the working principle of the CameraLink protocol in the Base mode.

In the Base mode of the Camera Link standard, the signals at least include: camera control signals, serial communication signals and video data signals. The following describes the signal types and transmission methods one by one:

camera control signal

The Camera Link protocol in Base mode involves a 4-bit camera control signal, which is defined as the input signal of the camera and the output signal of the frame grabber. In general, these signal names and related information are described in Table 1 below:

Table 1

2. Serial communication signal

The Camera Link protocol in Base mode involves a 2bits serial communication signal, which is used to realize asynchronous serial communication control between the camera and the image acquisition card. Its communication format is 1 start bit, 8 data bits, 1 stop bit, parity check bit and handshake bit.

The 2bits serial communication signal may also be called a 2bits asynchronous communication signal, and its specific information is shown in Table 2 below.

Signal name signal flow SerTFG Camera serial output to frame grabber serial input SerTC Frame grabber serial output to camera serial input

Table 2

3. Video data signal

The video data signal part is the core of the Camera Link protocol. The video data signal mainly includes 5 pairs of differential signals, namely X0- and X0+, X1- and X1+, X2- and X2+, X3- and X3+, Xclk- and Xclk+.

The video sending end converts the 28bits data signal and 1 clock signal into 5 pairs of differential signals according to the ratio of 7:1, and the receiving end converts the 5 pairs of differential signals into 28bits data signal and 1 clock signal.

In Base mode, the 28bits data signal includes 4bits video control signal and 24bits image data signal. The 28bits image data signal can be classified into FVAL signal, LVAL signal, DVAL signal, SPARE signal, PORTA signal, PORTB signal, PORTC signal according to the independent function classification.

Among them, the 4bits video control signal is divided into FVAL signal, LVAL signal, DVAL signal, SPARE signal. For the 4bits video control signal, the specific information is shown in Table 3 below:

table 3

Among them, the other 24bits data is transmitted through the 3 ports opened in the Base mode, the 3 ports are A port, B port and C port, also called PORTA, PORTB and PORTC, each port transmits 8bits data.

After introducing the working principle of the Camera Link protocol in the Base mode, the composition and working principle of an optical fiber transmission system 10 provided in Embodiment 1 of the present invention are described in detail:

The sending device 1 includes an input module 11 , a decoding module 12 , a first main controller 13 and a first photoelectric conversion module 15 which are connected in sequence. The active elements in the transmitting device 1 are powered by the power supply device 4 .

The transmission signal passing through the input module 11 , the decoding module 12 , the first main controller 13 and the first photoelectric conversion module 15 in sequence belongs to the downlink transmission signal. The transmission signal passing through the first photoelectric conversion module 15 , the first main controller 13 , the decoding module 12 and the input module 11 in sequence belongs to the uplink transmission signal.

The input module 11 adopts the standard MDR26 connector in the Base mode of the Camera Link protocol. The input module 11 receives the LVDS signal from the industrial camera 100 and transmits the signal to the decoding module 12 . The input module 11 also receives the camera control signal from the decoding module 12 . and asynchronously communicate LVDS signals and deliver the signals to the industrial camera 100 .

As shown in FIG. 1 , the decoding module 12 receives the image LVDS signal of the industrial camera 100 from the input module 11 and performs 1:7 differential serial-parallel decoding to obtain a 28-bit data signal and a 1-bit SerTFG serial communication signal. The 28bits data signal includes 4bits control signal and 24bits image data signal. The decoding module 12 outputs the 28bits data signal and the 1bit SerTFG serial communication signal to the first main controller 13, the decoding module 12 also receives the camera control signal and the SerTC serial communication signal from the first main controller 13, decodes the The module 12 performs LVDS encoding on the camera control signal and the SerTC serial communication signal from the first main controller 13 and transmits it to the input module 11 . Preferably, the decoding module 12 is a decoding chip DS90CR288A.

The first main controller 13 performs signal processing on the received 28bits data signal from the decoding module 12 and the 1bit SerTFG serial communication signal, and performs frame start, frame end, frame valid, frame blanking, line start, line end , line-valid, line-blanking state custom protocol encoding, and then input the encoded first protocol packet to the TX Gearbox input end of the first GTX transceiver 16 hard-core IP integrated in the first main controller 13, and The K code is automatically inserted, and after 8B/10B encoding is performed, it is output to the first photoelectric conversion module 15 through the LVDS output port TXP/N of the first GTX transceiver 16, and the output to the first photoelectric conversion module 15 is 1lane high-speed differential signal At the same time, the input port RXP/N of the first GTX transceiver 16 of the first main controller 13 receives the LVDS signal output from the first photoelectric conversion module 15, and after 8B/10B decoding, the RX in the first GTX transceiver 16 is decoded. Gearbox outputs data packets conforming to the custom protocol, and finally decodes the parallel camera control signal and SerTC serial communication signal from the second protocol packet through the custom protocol decoding module, and outputs them to the decoding module 12; the first main controller 13 is preferably an FPGA main controller, and further, the first main controller 13 is preferably an XC7K70T/XC7A50T main control chip.

The first photoelectric conversion module 15 performs mutual conversion between the electrical signal and the optical signal, so that the signal output by the first main controller 13 can be converted into an optical signal, which is then transmitted to the receiving device 3 . The first photoelectric conversion module 15 can also convert the optical signal from the receiving device 3 into an electrical signal. The first photoelectric conversion module 15 is preferably a general 3.125Gbps single-fiber bidirectional optical fiber module. The first photoelectric conversion module 15 is preferably an SFP+ interface optical fiber module.

The receiving device 3 includes an output module 31 , an encoding module 32 , a second main controller 33 and a second photoelectric conversion module 35 which are connected in sequence. The active elements in the receiving device 3 are powered by the power supply device 4 .

The transmission signal passing through the output module 31 , the encoding module 32 , the second main controller 33 and the second photoelectric conversion module 35 in sequence belongs to the downlink transmission signal. The transmission signal passing through the second photoelectric conversion module 35 , the second main controller 33 , the encoding module 32 and the output module 31 in sequence belongs to the uplink transmission signal.

The output module 31 adopts the standard MDR26 connector in the Base mode of the Camera Link protocol. The output module 31 receives the LVDS encoded signal from the encoding module 32 and outputs it to the back-end image acquisition device 200; The camera control signal and the LVDS signal of the camera 100 are asynchronously communicated, and the signal is passed to the encoding module 32 .

The encoding module 32 receives a parallel signal from the second main controller 33 that conforms to the camera timing, that is, a 28-bit data signal, and the encoding module 32 also receives a 1-bit SerTFG serial communication signal. Differential serial encoding is performed to obtain an LVDS signal conforming to the Base mode of the Camera Link protocol, and the signal is output to the output module 31 . The encoding module 3 receives the camera control signal and the communication signal from the output module 31 and performs serial-parallel decoding from LVDS to LVTT to obtain the camera control signal (CC1-CC4) and the SerTC serial communication signal. (CC1-CC4) and SerTC serial communication signals are sent to the second main controller 33. Preferably, the encoding module 32 is an encoding chip DS90CR287.

The second main controller 33 receives the camera control signal and the SerTC serial communication signal from the encoding module 32 , encodes them with a custom protocol, and then sends the encoded third protocol packet to the second main controller 33 . In the TX Gearbox in the two GTX transceivers 36, the third protocol packet is 8B/10B encoded inside the TX Gearbox and then output to the second photoelectric conversion module 35 through the TXP/N port; The input port RXP/N of the GTX transceiver 36 receives the LVDS signal output from the second photoelectric conversion module 35, and after 8B/10B decoding, the RX Gearbox on the second GTX transceiver 36 outputs the first LVDS signal conforming to the custom protocol. Four protocol packets, the user-defined decoding module in the second main controller 33 can detect the frame start, frame end, frame valid, frame blanking, line start, line end, line valid, and line blanking in the image in the fourth protocol packet The second main controller 33 transmits the 28-bit image data and the 1-bit SerTFG serial communication signal to the encoding module 32. The 28-bit data signal includes 4bits video control signal and 24bits image data signal. The 28bits image data signal can be classified into FVAL signal, LVAL signal, DVAL signal, SPARE signal, PORTA signal, PORTB signal, PORTC signal according to the independent function classification. The second main controller 33 is preferably an FPGA main controller, and further, the second main controller 33 is preferably an XC7K70T/XC7A50T main control chip.

The second photoelectric conversion module 35 performs mutual conversion between the electrical signal and the optical signal. The second photoelectric conversion module 35 converts the optical signal from the transmitting device 1 into a high-speed differential electrical signal of 1 lane, and sends it to the second main controller 33 . The second photoelectric conversion module 35 converts the electrical signal from the second main controller 33 into an optical signal and transmits it to the sending device 1 . The second photoelectric conversion module 35 is preferably a general 3.125Gbps single-fiber bidirectional optical fiber module. The second photoelectric conversion module 35 is preferably an SFP+ interface optical fiber module.

In the embodiment of the present invention, the sending device 1 can adaptively encode image data of any resolution and frame rate in the Base mode of the Camera Link protocol, and recombine the data in the first main controller 13 to make it suitable for the first main controller 13. The input format of the GTX transceiver requires and can automatically insert the k code to maximize the effective transmission bandwidth;

The camera control signal and the asynchronous communication signal sent by the receiving device 3 can be decoded by self-definition, and asynchronous communication at any baud rate can be realized.

The receiving device 3 performs photoelectric conversion on the optical signal sent by the transmitting device 1 and then enters the second main controller 33. After passing through the second GTX transceiver, the image data of the custom protocol is obtained. The image data with the same resolution, frame rate and bit width as the input image of the sending device 1 is obtained, and is output to the image acquisition device 200 through the coding chip; at the same time, the receiving device 3 controls the received camera from the image acquisition device 200. The signal and the asynchronous communication signal are self-coded and sent to the optical fiber module for photoelectric conversion after being encoded by the 8B/10B of the second GTX transceiver, and transmitted to the sending device 1 through the optical fiber, which can realize two-way communication at any communication baud rate.

The optical fiber transmission medium 2 can complete bidirectional communication by using a single optical fiber with an LC interface (but not limited to this type and quantity).

The transmitting device 1 and the receiving device 3 are of compact design, small in size, and easy to install. The dimensions of the main body of the transmitting device 1 and the receiving device 3 are as follows: the width is 40 mm, the length is 110 mm, and the height is 15 mm.

FIG. 4 is a flowchart of an optical fiber transmission method in an embodiment of the present invention. As shown in Figure 4, the present invention also provides a kind of optical fiber transmission method, it comprises uplink transmission and downlink transmission, and described downlink transmission comprises the following steps:

Step S1, carry out self-defined protocol encoding to the downlink data signal and SerTFG serial communication signal in the Base mode in the Camera Link protocol to obtain the first protocol packet;

Step S2, inserting the K code into the first protocol packet, and then performing 8B/10B encoding to obtain a downlink 1lane high-speed differential signal, and then the downlink 1lane high-speed differential signal is converted into optical signal transmission;

Step S3, decoding the optical signal according to a decoding method symmetric to steps S1 to S2;

The uplink transmission includes the following steps:

Step S4, performing self-defined protocol encoding on the upstream camera control signal and the SerTC serial communication signal in the Base mode in the Camera Link protocol to obtain a third protocol packet;

Step S5, 8B/10B encoding is performed on the third protocol packet to obtain an upstream 1lane high-speed differential signal, and then the upstream 1lane high-speed differential signal is converted into an optical signal for transmission;

In step S6, the optical signal is decoded according to a decoding method symmetric to steps S4 to S5.

The self-defined protocol encoding process is to perform self-defined protocol encoding on one or more of the frame start, frame end, frame valid, frame blanking, line start, line end, line valid and line blanking states of the signal. process.

Downlink transmission of 28bits data signal and 1bit SerTFG serial communication signal, the principle is:

In step S11, specifically, the 28bits data signal and the 1bit SerTFG serial communication signal are subjected to signal processing to perform frame start, frame end, frame valid, frame blanking, line start, line end, line valid and line blanking. One or more of the states are encoded in a custom protocol.

In step S12, continue to downlink the encoded first protocol packet, and then automatically insert the K code, and then perform 8B/10B encoding and output to the first photoelectric conversion module through the transceiver, and the output to the first photoelectric conversion module 15 is: 1lane high-speed differential signaling.

Step S13, symmetrical decoding to restore the same 28-bit data signal and 1-bit SerTFG serial communication signal as in step S1.

Uplink transmission of camera control signal and SerTC serial communication signal, the principle is as follows:

Step S14, specifically, the camera control signal and the SerTC serial communication signal are encoded with a custom protocol.

Step S15, continue to perform 8B/10B encoding on the encoded third protocol packet and output it to the second photoelectric conversion module 35; and then convert the upstream 1lane high-speed differential signal into an optical signal for transmission.

Step S16, symmetrical decoding to restore the same camera control signal and SerTC serial communication signal as in step S4.

The beneficial effects of the optical fiber transmission method provided by the present invention are:

1. Through this method, the image data of any resolution and frame rate in the Base mode of the Camera Link protocol can be adaptively encoded, and then K code is inserted, which can maximize the effective transmission bandwidth.

2. Using optical fiber transmission, the noise interference is small and the transmission rate is high.

3. By this method, the camera control signal and asynchronous communication signal sent over can be decoded by self-definition, and asynchronous communication at any baud rate can be realized.

The above are only preferred embodiments of the present invention, which are merely illustrative rather than restrictive for the present invention. The structure and connection mode of each component in the present invention can be changed to some extent, and all equivalent transformations and improvements made on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.

Claims (5)

1. An optical fiber transmission system comprising an optical fiber transmission medium, characterized in that it further comprises:

the device comprises a transmitting device, a receiving device and a transmitting device, wherein the transmitting device is used for carrying out downlink transmission coding on a data signal and a SerTFG serial communication signal which accord with a Base mode in a Camera L ink protocol to obtain a first downlink signal;

the receiving device is used for carrying out symmetrical decoding on the first downlink signal and also carrying out uplink transmission coding on a Camera control signal and a SerTC serial communication signal which conform to the Base mode in the Camera L ink protocol so as to obtain a first uplink signal;

the first downlink signal and the first uplink signal are transmitted through the optical fiber transmission medium;

the transmitting device comprises a first main controller and a first photoelectric conversion module which are connected with each other;

the first master controller is used for carrying out protocol coding on the data signals of the downlink and the SerTFG serial communication signals in the Base mode in the Camera L ink protocol to obtain a first protocol packet, wherein the customized behaviors comprise one or more of a frame start state, a frame end state, a frame effective state, a frame blanking state, a line start state, a line end state, a line effective state and a line blanking state;

the first main controller inserts a K code into the first protocol packet through a first GTX transceiver integrated in the first main controller, and the first GTX transceiver performs 8B/10B coding on the first protocol packet inserted with the K code to obtain a downlink differential signal; the downlink differential signal is transmitted to the first photoelectric conversion module by the first main controller;

the first main controller further symmetrically decodes the uplink differential signal through a first GTX transceiver integrated therein to acquire an uplink camera control signal and a SerTC serial communication signal from a second protocol packet;

the transmitting device comprises an input module, a decoding module, the first main controller and the first photoelectric conversion module which are connected in sequence;

the input module is arranged between the industrial camera and the decoding module, and is used for transmitting L VDS signals from the industrial camera in a downstream mode;

the decoding module is arranged between the input module and the first main controller, and is used for converting L VDS signals from the industrial Camera into data signals and SerTFG serial communication signals in a Base mode in accordance with Camera L ink protocol and continuing to transmit the signals downstream to the first main controller;

the decoding module further first L VDS encoding upstream camera control signals and SerTC serial communication signals from the first master controller, the decoding module transmitting signals encoded via a first L VDS to the input module, the input module being capable of continuing to pass signals encoded via a first L VDS to the industrial camera;

the receiving device comprises a second main controller and a second photoelectric conversion module which are connected with each other;

the second photoelectric conversion module is used for converting the optical signal from the sending device back to a downlink differential signal and transmitting the downlink differential signal to the second main controller; the second photoelectric conversion module is further configured to convert the uplink differential signal generated by the second main controller into an optical signal sent to a sending device;

the second main controller is used for carrying out self-defined protocol coding on an uplink Camera control signal and a SerTC serial communication signal which accord with a Base mode in a Camera L ink protocol to obtain a third protocol packet, and the second main controller carries out 8B/10B coding on the third protocol packet through a second GTX transceiver integrated in the second main controller to obtain an uplink differential signal;

the second main controller further symmetrically decodes the downlink differential signal from the transmitting device through the second GTX transceiver to obtain a downlink data signal and a SerTFG serial communication signal;

the receiving device comprises an output module, a coding module, the second main controller and the second photoelectric conversion module which are connected in sequence;

the output module is arranged between the coding module and the image acquisition equipment, and is used for transmitting the second L VDS coding signal from the coding module to the image acquisition equipment in a downlink manner;

the encoding module is arranged between the output module and the second main controller, and is used for converting an upstream L VDS signal from the image acquisition equipment into an upstream Camera control signal and a SerTC serial communication signal which are in accordance with a Base mode in a Camera L ink protocol, and continuously transmitting the signals to the second main controller;

the encoding module also second L VDS encodes the downstream data signals and SerTFG serial communication signals from the second master controller, the encoding module transmitting signals encoded via a second L VDS to the output module.

2. The optical fiber transmission system according to claim 1, wherein the data signals conforming to the Base mode of the Camera L ink protocol include 28bits of data signals, the 28bits of data signals include 4bits of video control signals and 24bits of image data signals, the 4bits of video control signals are FVA L signals, L VA L signals, DVA L signals and SPARE signals, respectively, the 24bits of image data signals are PORTA signals, PORTB signals and PORTC signals, and the 24bits of image data signals are transmitted through 3 ports.

3. An optical fiber transmission system according to claim 1, wherein each of the transmitting device and the receiving device is provided with a photoelectric conversion module, and the photoelectric conversion module comprises a transceiver-integrated optical fiber module with SFP or SFP + interface; the optical fiber transmission medium is a single-mode or multi-mode optical fiber.

4. An optical fiber transmission system according to claim 1, wherein the transmitting device and the receiving device are respectively provided with a first main controller and a second main controller, and the first main controller and the second main controller are XC7K70T/XC7a50T main control chips;

the decoding module on the transmitting device is a DS90CR288A decoding chip, and the encoding module on the receiving device is a DS90CR287 encoding chip.

5. An optical fiber transmission method applied to the optical fiber transmission system according to any one of claims 1 to 4, comprising a downstream transmission and an upstream transmission, wherein the downstream transmission comprises the following steps:

step S1, carrying out self-defined protocol coding on the downlink data signal and the SerTFG serial communication signal in the Base mode in the Camera L ink protocol to obtain a first protocol packet;

step S2, inserting K codes into the first protocol packet, and then carrying out 8B/10B coding to obtain a downlink 1lane high-speed differential signal, and further converting the downlink 1lane high-speed differential signal into an optical signal for transmission;

step S3, decoding the optical signal in a symmetrical decoding manner to the steps S1 to S2;

the uplink transmission comprises the following steps:

step S4, carrying out self-defined protocol coding on the Camera control signal and the SerTC serial communication signal which are in the uplink and accord with the Base mode in the Camera L ink protocol to obtain a third protocol packet;

step S5, 8B/10B coding is carried out on the third protocol packet to obtain the uplink 1lane high-speed differential signal, and then the uplink 1lane high-speed differential signal is converted into an optical signal for transmission;

step S6, decoding the optical signal in a symmetrical decoding manner to the steps S4 to S5;

the self-defined protocol coding process is a self-defined protocol coding process for one or more of the states of frame start, frame end, frame valid, frame blanking, line start, line end, line valid and line blanking of the signal.

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