HDMI video multimode fiber SWDM transmitter

Abstract

The utility model provides an HDMI video multimode optical fiber SWDM transmitter, which relates to the technical field of transmission equipment, and comprises an optical fiber video extender, a transmitter, a receiver and an electric signal path, the transmitter is connected with an HDMI Source end, the receiver is connected with an HDMI Sink end, the transmitter and the receiver are connected through an optical fiber, and the problem that the HDMI high-definition line is only 15m in longest length and is not long enough is solved by adopting a mode of installing the optical fiber video extender. An HDMI signal is attenuated and the video quality is influenced when the HDMI signal exceeds 15 meters, but in daily work and life, a video is generally required to be transmitted to a place of dozens of meters and even hundreds of meters, so that the video signal is required to be prolonged and controlled, and when the existing HDMI extender is used for transmitting the video signal for a long distance, the image ghosting is easy to occur, and the video quality is influenced. And the definition and the fidelity of the video are difficult to guarantee, so that the user experience is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission equipment, in particular to an HDMI video multimode optical fiber SWDM transmitter. Background Art

[0002] In the HD era, while pursuing picture quality, we also want more robust video transmission, including long-distance transmission, smooth intermittent screen flickering, and smooth video artifacts. For example, consider setting up a home theater system. While this sounds like a complex system, its core device is an HDMI extender. As a professional digital signal source long-distance transmission device, an HDMI extender can transmit audio and video signals from set-top boxes, DVDs, computers, and other sources to remote devices such as TVs, monitors, and projectors. This device transmits high-definition HDMI video signals uncompressed over a single-core multimode / single-mode optical fiber, enabling the remote transmission, distribution, and sharing of high-definition video.

[0003] In existing technology, the maximum length of HDMI high-definition cables is only 15 meters. Any length exceeding 15 meters will cause HDMI signal attenuation, thus affecting video quality. However, in daily work and life, videos usually need to be transmitted to distances of dozens, hundreds, or even millions of meters. This requires extending and controlling the video signal. However, existing HDMI extenders are prone to image ghosting, color distortion, and transmission failure when transmitting video signals over long distances, making it difficult to ensure video clarity and fidelity, resulting in a reduced user experience. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose an HDMI video multimode optical fiber SWDM transmitter.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions: HDMI video multimode fiber SWDM transmitter, including optical fiber video extender, transmitter, receiver and electrical signal path, the transmitter output end is connected to the HDMISource end, the receiver output end is connected to the HDMI At the Sink end, the transmitter port and the receiver port are both connected through optical fiber. The electrical signal path includes an HDMI repeater, an Ethernet serializer circuit, a SWDM optical fiber module, an EDID learning circuit, an MCU control signal processing unit, and a transmission channel detection indicator and power supply module. The optical fiber video extender has a built-in MCUC8051F392. In the prior art, the longest HDMI high-definition cable is only 15 meters. If it exceeds 15 meters, the HDMI signal will be attenuated, thereby affecting the video quality. However, in daily work and life, it is usually necessary to transmit the video to a distance of tens or even hundreds of meters. This requires extending and controlling the video signal. When the existing HDMI extender transmits the video signal over a long distance, problems such as image ghosting, color distortion, and inability to transmit are prone to occur. It is difficult to ensure the clarity and fidelity of the video, resulting in a reduced user experience. To address such problems, the utility model solves the problem by installing an optical fiber video extender, so that the optical fiber video extender amplifies the HDMI signal amplifier and transmits the analog electrical signal to the optical transmitter, which drives the laser after signal shaping. After the optical signal is transmitted over a long distance through optical fiber, it is converted into the original electron source by a wavelength-matched photodiode at the receiving end. It is amplified by a low-noise linear amplifier, decoded and restored before being output. The HDMI signal is converted into a 10G signal through a conversion chip and sent and received through an optical module and optical fiber. It supports HDMI2.0 and is compatible with previous protocols. The transmission rate is 10Gbps, supports HDCP, and has a resolution of up to 4Kx2K@60Hz. It supports hot plugging of HDMI interfaces, low energy consumption, plug and play, and supports 1M-60KM extension (matched according to the characteristics of the optical module), thereby expanding the scope of application and improving user experience.

[0006] Preferably, the HDMI repeater is configured as a regenerator with the function of removing HDMI signal jitter. The HDMI repeater supports HDMI 2.0 and supports 6.0 gbps data rate. The HDMI repeater is programmed to receive data channel equalizer gain 16dB, EQ, pre-emphasis, output swing and conversion rate global or independent channel control, and by converting the HDMI signal into a 10G signal, transmitting and receiving through an optical module and optical fiber, the long-distance transmission of the HDMI high-definition signal is achieved. Each extender includes a transmitter and a receiver, the transmitter is connected to the HDMI Source end, and the receiver is connected to the HDMI Sink end. The transmitter and receiver are connected through optical fiber. When a single-fiber CWDM optical module is used, the transmission of the transmitter optical module is connected to the reception of the receiver optical module through optical fiber. Similarly, the reception of the transmitter optical module is connected to the transmission of the receiver optical module through optical fiber, thereby achieving single-fiber bidirectional transmission. After the parallel HDMI2.0 signals and other low-speed service signals are serialized and multiplexed, a single-fiber signal stream is formed for transmission. The point-to-point optical fiber transmission solution can be flexibly configured, which can remove HDMI The jitter and phase difference of the frequency and data in the 2.0 signal are significantly improved, ensuring that different types of HDMI transmission cables can operate correctly and reliably between systems. It also compensates for signal distortion caused by long, low-quality or even damaged HDMI transmission cables, thereby improving the user experience.

[0007] Preferably, the Ethernet serializer circuit adopts an Ethernet transceiver for full-duplex point-to-point data transmission, and the data rate of the Ethernet serializer circuit supports 0.6 Gbps to 1.3 Gbps. The Ethernet serializer circuit is based on the timing requirements of the IEEE802.3 Gigabit Ethernet specification for the 10-bit interface specification, and realizes an Ethernet transceiver for high-speed full-duplex point-to-point data transmission. After serializing and multiplexing the DDC, CEC signals and other low-speed service signals, a single 1 Gbps high-speed signal stream is formed for transmission. The serializer supports data rates from 0.6 Gbps to 1.3 Gbps. It performs data serialization, deserialization and clock extraction functions for the physical layer interface based on the timing requirements of the IEEE802.3 Gigabit Ethernet specification for the 10-bit interface specification, thereby improving the convenience of device use.

[0008] Preferably, the SWDM optical fiber module is a single-fiber bidirectional optical fiber transmission module, which includes a sending unit, a receiving unit and a management unit. The sending unit adopts an optical multiplexer SWDM, the receiving unit includes an access laser device, the receiving unit adopts a SWDM optical demultiplexer, and the receiving unit adopts a TIA component, so that the transmitting unit drives and amplifies multiple electrical signals and then uses the optical multiplexer SWDM to merge the optical signals of these wavelengths into one optical fiber for transmission, and the access laser device converts the electrical signal into an optical signal for transmission output, and the receiving unit converts the single-fiber optical signal into an electrical signal through the SWDM optical demultiplexer and the optical signals received by different receiving TIA components, and then reshapes and amplifies the input, so as to achieve the effect of long-distance transmission of high-fidelity signals.

[0009] Preferably, the EDID learning circuit has a manual learning function, which realizes the manual learning function to learn the EDID information of the remote display device into the product, so that the optical transmitter can be more flexibly and conveniently adapted to be installed on display screens of various resolutions. The learning access method is simple and convenient, which greatly facilitates the overall design of the system and improves the compatibility of the system.

[0010] Preferably, the MCU control signal processing unit adopts an I2C two-wire interface to realize DMI debugging and monitoring. The advantage of the SWDM optical module is that it can realize the resource sharing and conservation of optical fiber, and the use of wavelength division multiplexing technology solves the need for bidirectional transmission of data signals on a single single-mode optical fiber. At the same time, the system design reflects the long-distance transmission capability of optical fiber.

[0011] Preferably, the MCU C8051F392 adopts a hardware IIC interface and a multi-channel I / O input and output interface, which makes it convenient for the system to read, write and detect the data of the extender. When in the EDID learning function, the IIC device is the host; when in the external EDID function, the IIC device is the slave. C8051F392 also detects the status of the button and switches the corresponding function and status after status analysis. Among them, initializing the IIC channel is implemented by the function SMBus_Init, obtaining the button status from the MCU's I / O is implemented by the function GetKeyValue(void), writing EDID to FLASH is implemented by the function FLASH_Write(unsigned int dest, char *src, unsigned int numbytes), and reading EDID from FLASH is implemented by the function FLASH_Read(char *dest, unsigned int src, unsigned int numbytes).

[0012] Beneficial effects:

[0013] 1. In the existing technology, the maximum length of HDMI high-definition cable is only 15 meters. If it exceeds 15 meters, the HDMI signal will be attenuated, thus affecting the video quality. However, in daily work and life, it is usually necessary to transmit videos to a distance of tens or even hundreds of meters. This requires extending and controlling the video signal. However, when transmitting video signals over long distances, existing HDMI extenders are prone to problems such as image ghosting, color distortion, and inability to transmit. It is difficult to ensure the clarity and fidelity of the video, resulting in a reduced user experience. To address such problems, the present invention solves this problem by installing a fiber optic video extender. The fiber optic video extender amplifies the HDMI signal amplifier and transmits the analog electrical signal to the optical transmitter. After signal shaping, the laser is driven. After the optical signal is transmitted over a long distance through optical fiber, it is converted into the original electron source by a wavelength-matched photodiode at the receiving end. It is amplified by a low-noise linear amplifier, decoded and restored before being output. The HDMI signal is converted into a 10G signal through a conversion chip and sent and received through an optical module and optical fiber. It supports HDMI2.0 and is compatible with previous protocols. The transmission rate is 10Gbps, supports HDCP, and has a resolution of up to 4Kx2K@60Hz. It supports hot plugging of HDMI interfaces, low energy consumption, plug and play, and supports 1M-60KM extension (matched according to the characteristics of the optical module), thereby expanding the scope of application and improving user experience.

[0014] 2. For long-distance transmission of HDMI high-definition signals, each extender includes a transmitter and a receiver. The transmitter is connected to the HDMI Source end and the receiver is connected to the HDMI Sink end. The transmitter and receiver are connected via optical fiber. When using a single-fiber CWDM optical module, the transmission of the transmitter optical module is connected to the reception of the receiver optical module via optical fiber. Similarly, the reception of the transmitter optical module is connected to the transmission of the receiver optical module via optical fiber, thus realizing single-fiber bidirectional transmission. After serializing and multiplexing the parallel HDMI2.0 signals and other low-speed service signals, a single-fiber signal stream is formed for transmission. The point-to-point optical fiber transmission solution can be flexibly configured. It can remove the frequency and data jitter and phase difference in the HDMI 2.0 signal, significantly improving the signal quality, ensuring that different types of HDMI transmission cables can operate correctly and reliably between systems, and compensating for signal distortion caused by long, low-quality or even damaged HDMI transmission cables, thereby improving the user experience.

[0015] 3. An Ethernet transceiver with high-speed full-duplex point-to-point data transmission is used to serialize and multiplex DDC, CEC signals and other low-speed service signals to form a single 1Gbps high-speed signal stream for transmission. The serializer supports data rates from 0.6 Gbps to 1.3 Gbps. Based on the timing requirements of the IEEE 802.3 Gigabit Ethernet specification for 10-bit interface specifications, it performs data serialization, deserialization and clock extraction functions for the physical layer interface, thereby improving the convenience of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a test connection diagram of the optical fiber extender of the present utility model;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the front panel of the present invention;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the back panel of the present invention;

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the interface of the utility model

[0020] Figure 5 This is a software control block diagram of the utility model;

[0021] Figure 6 Schematic diagram of the sending unit of the present utility model;

[0022] Figure 7 This is a schematic diagram of a receiving unit of the present invention;

[0023] Figure 8 This is a schematic diagram of the PCB design and layout of the utility model;

[0024] Figure 9 This is a block diagram of the transmitting principle of the extender of the utility model;

[0025] Figure 10 This is a block diagram of the receiving principle of the extender of the present invention. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments and drawings. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0027] The specific embodiments of the present utility model are described below with reference to the accompanying drawings. Specific embodiment:

[0029] Reference Figure 1-10, HDMI video multimode fiber SWDM transmitter, including fiber optic video extender, transmitter, receiver and electrical signal path, the transmitter is connected to the HDMI Source end, the receiver is connected to the HDMI At the Sink end, the transmitter and receiver are connected through optical fiber. The electrical signal path includes HDMI repeater, Ethernet serializer circuit, SWDM optical fiber module, EDID learning circuit, MCU control signal processing unit and transmission channel detection indicator and power module. The optical fiber video extender has a built-in MCUC8051F392. The longest HDMI high-definition cable is only 15 meters. More than 15 meters will cause HDMI signal attenuation and affect the video quality. However, in daily work and life, it is usually necessary to transmit video to a distance of tens or even hundreds of meters. This requires extending and controlling the video signal. When the existing HDMI extender transmits video signals over long distances, image ghosting, color distortion, and inability to transmit are prone to problems such as image distortion, color distortion, and inability to transmit. It is difficult to ensure the clarity and fidelity of the video, resulting in a reduced user experience. To address such problems, the utility model solves the problem by installing an optical fiber video extender, which realizes that the optical fiber video extender amplifies the HDMI signal amplifier and transmits the analog electrical signal to the optical transmitter. After signal shaping, the laser is driven. After the optical signal is transmitted over a long distance through optical fiber, it is converted into the original electron source by a wavelength-matched photodiode at the receiving end. It is amplified by a low-noise linear amplifier, decoded and restored before being output. The HDMI signal is converted into a 10G signal through a conversion chip and sent and received through an optical module and optical fiber. It supports HDMI2.0 and is compatible with previous protocols. The transmission rate is 10Gbps, supports HDCP, and has a resolution of up to 4Kx2K@60Hz. It supports hot plugging of HDMI interfaces, low energy consumption, plug and play, and supports 1M-60KM extension (matched according to the characteristics of the optical module), thereby expanding the scope of application and improving user experience.The HDMI repeater is set as a regenerator with the function of removing HDMI signal jitter. The HDMI repeater supports HDMI 2.0 and supports 6.0 gbps data rate. The HDMI repeater is programmed to receive data channel equalizer gain of 16 dB, and global or independent channel control of EQ, pre-emphasis, output swing and conversion rate. By converting the HDMI signal into a 10G signal, it is transmitted and received through an optical module and optical fiber, thereby realizing long-distance transmission of HDMI high-definition signals. Each extender includes a transmitter and a receiver. The transmitter is connected to the HDMI Source end and the receiver is connected to the HDMI Sink end. The transmitter and receiver are connected through optical fiber. When using a single-fiber CWDM optical module, the transmission of the transmitter optical module is connected to the reception of the receiver optical module through optical fiber. Similarly, the reception of the transmitter optical module is connected to the transmission of the receiver optical module through optical fiber, thereby realizing single-fiber bidirectional transmission. After the parallel HDMI2.0 signals and other low-speed service signals are serialized and multiplexed, a single-fiber signal stream is formed for transmission. The point-to-point optical fiber transmission solution can be flexibly configured. It can remove HDMI The jitter and phase difference of the frequency and data in the 2.0 signal are significantly improved, ensuring that different types of HDMI transmission cables can operate correctly and reliably between systems. It also compensates for signal distortion caused by long, low-quality or even damaged HDMI transmission cables, thereby improving the user experience. The Ethernet serializer circuit uses an Ethernet transceiver for full-duplex point-to-point data transmission. The Ethernet serializer circuit supports data rates from 0.6 Gbps to 1.3 Gbps. The Ethernet serializer circuit is based on the timing requirements of the IEEE 802.3 Gigabit Ethernet specification for the 10-bit interface specification, realizing an Ethernet transceiver that uses high-speed full-duplex point-to-point data transmission. After serializing and multiplexing the DDC, CEC signals and other low-speed service signals, a single 1 Gbps high-speed signal stream is formed for transmission. The serializer supports data rates from 0.6 Gbps to 1.3 Gbps. Based on the timing requirements of the IEEE 802.3 Gigabit Ethernet specification for the 10-bit interface specification, it performs data serialization, deserialization, and clock extraction functions for the physical layer interface, thereby improving the ease of use of the device.The SWDM fiber optic module is a single-fiber, bidirectional fiber optic transmission module consisting of a transmitter unit, a receiver unit, and a management unit. The transmitter unit utilizes an optical multiplexer (SWDM), and the receiver unit includes an access laser device and a SWDM optical demultiplexer (DEMUX). The receiver unit utilizes a TIA component. The transmitter unit drives and amplifies multiple electrical signals, then uses the SWDM optical multiplexer to combine these wavelengths of optical signals into a single optical fiber for transmission. The access laser device converts the electrical signals into optical signals for transmission. The receiver unit converts the single-fiber optical signal received by the SWDM optical demultiplexer and various receiving TIA components into an electrical signal, which is then reshaped and amplified for input, achieving high-fidelity signal transmission over long distances. The EDID learning circuit features a manual learning function that allows the EDID information of remote display devices to be learned internally, enabling the optical transmitter to more flexibly and conveniently adapt to displays of various resolutions. The simple and convenient learning access method greatly facilitates overall system design and improves system compatibility. The MCU control signal processing unit uses an I2C two-wire interface to implement DMI debugging and monitoring. The advantage of the SWDM optical module is that it can realize the sharing and conservation of optical fiber resources. The use of wavelength division multiplexing technology solves the need for bidirectional transmission of data signals on a single single-mode optical fiber. At the same time, the system design reflects the long-distance transmission capability of optical fiber.

[0030] MCUC8051F392 uses a hardware IIC interface and multiple I / O input and output interfaces to facilitate the system to read, write and detect the extender's data. When in the EDID learning function, the IIC device is the host; when in the external EDID function, the IIC device is the slave. C8051F392 also detects the status of the button and switches the corresponding function and status after status analysis. Among them, initializing the IIC channel is implemented by the SMBus_Init function, obtaining the button status from the MCU's I / O is implemented by the GetKeyValue(void) function, writing EDID to FLASH is implemented by the FLASH_Write (unsigned intdest, char *src, unsigned int numbytes), and reading EDID from FLASH is implemented by the FLASH_Read (char *dest, unsigned int src, unsigned int numbytes).

[0031] This utility model works by providing externally learned EDID information to the source device to optimize image signal output. Without external EDID information, the system reads the built-in EDID information and enters transparent transmission mode. Once the system has read the EDID information of different display devices, it enters EDID mode, maximizing compatibility with various devices.

[0032] The test steps are as follows: Connect the HDMI signal source to the HDMI fiber optic extender transmitter and the HDMI fiber optic extender receiver to a display device (such as an HDTV, video wall, etc.). Use an LC fiber optic cable to connect the fiber optic ports on the transmitter and receiver. Connect the transmitter and receiver to a power source. When the power indicator lights up normally and the LINK status indicator stays on, the system is operating normally in transparent transmission mode, with the signal source and display video transmitting synchronously without any black screen, flickering, distorted screen, or other issues. Replace different display devices and switch resolutions to observe whether the display results meet the standard requirements. Repeatedly plug and unplug the fiber optic ports to ensure they meet the test standards. Power cycle the transmitter and receiver individually or simultaneously to ensure they meet the test standards. For example, after connecting the transmitter's POWER function, connect the monitor's HDMI port to the transmitter's HDMI port. Press and hold the EDID learning button. The EDID indicator will turn from off to solid on, indicating that EDID learning mode has been entered. Release the EDID button and wait for the EDID indicator to flash 2-3 times before turning off, indicating that EDID learning is complete. In EDID learning mode, the display's EDID information is read and saved in the MCU's built-in FLASH.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. HDMI video multimode fiber SWDM transmitter, including fiber optic video extender, transmitter, receiver and electrical signal path, characterized by: The transmitter output end is connected to the HDMI Source end, the receiver output end is connected to the HDMI Sink end, the transmitter port and the receiver port are both connected via optical fiber, the electrical signal path includes an HDMI repeater, an Ethernet serializer circuit, a SWDM optical fiber module, an EDID learning circuit, an MCU control signal processing unit, and a transmission channel detection indicator and power supply module, and the optical fiber video extender has a built-in MCUC8051F392.

2. The HDMI video multimode fiber SWDM transmitter according to claim 1, wherein: The HDMI repeater is configured as a regenerator with the function of removing HDMI signal jitter. The HDMI repeater supports HDMI 2.0 and 6.0 gbps data rate. The HDMI repeater is programmed to receive a data channel equalizer gain of 16 dB, and has global or independent channel control of EQ, pre-emphasis, output swing and conversion rate.

3. The HDMI video multimode optical fiber SWDM transmitter according to claim 1, wherein: The Ethernet serializer circuit adopts an Ethernet transceiver for full-duplex point-to-point data transmission. The Ethernet serializer circuit supports a data rate of 0.6 Gbps to 1.3 Gbps. The Ethernet serializer circuit is based on the timing requirements of the IEEE 802.3 Gigabit Ethernet specification for the 10-bit interface specification.

4. The HDMI video multimode optical fiber SWDM transmitter according to claim 1, wherein: The SWDM optical fiber module is a single-fiber bidirectional optical fiber transmission module. The SWDM optical fiber module includes a sending unit, a receiving unit and a management unit. The sending unit adopts an optical multiplexer SWDM, the receiving unit includes an access laser device, the receiving unit adopts a SWDM optical demultiplexer, and the receiving unit adopts a TIA component.

5. The HDMI video multimode optical fiber SWDM transmitter according to claim 1, wherein: The EDID learning circuit has a manual learning function.

6. The HDMI video multimode optical fiber SWDM transmitter according to claim 1, wherein: The MCU control signal processing unit adopts an I2C two-wire interface.

7. The HDMI video multimode optical fiber SWDM transmitter according to claim 1, wherein: The MCUC8051F392 uses a hardware IIC interface and a multi-channel I / O input and output interface.

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