Vehicle-mounted optical communication system, signal transmission method and vehicle
By introducing downlink and uplink optical links into the vehicle-mounted optical communication system, and utilizing optical routing modules and uplink optical aggregation components, the problem of high loss in traditional PON links is solved, thereby improving the quality of optical links and the high-temperature stability of the system, while reducing the power requirements and manufacturing difficulty of lasers.
Patent Information
- Application Number
- CN202611337518.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-31
- Publication Date
- 2026-11-06
AI Technical Summary
Traditional PON links suffer from high losses in optical splitters, resulting in poor optical link quality and weak resilience in vehicle-mounted optical communication systems, especially in high-temperature environments where they fail to meet automotive-grade requirements.
In the vehicle-mounted optical communication system, downlink and uplink optical links are introduced. Optical routing modules and uplink optical aggregation components are used to avoid optical signals passing through high-loss downlink optical distribution components. Time division multiple access and power consumption control are adopted to reduce laser power requirements.
It reduces optical link loss, decreases power consumption and heat generation of the vehicle-mounted optical network unit, lowers manufacturing difficulty and cost, improves the system's resilience, and simplifies heat dissipation design.
Smart Images
Figure CN123055186A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle-mounted optical communication technology, and in particular to a vehicle-mounted optical communication system, signal transmission method, and vehicle. Background Technology
[0002] With the development of Level 4 and above autonomous driving, the pixel count of cameras inside cars has increased significantly. Existing in-vehicle communication uses copper cables as the medium for signal transmission, resulting in higher bandwidth and latency requirements for in-vehicle communication.
[0003] When communication speeds reach 10G or higher, copper wire bundles can no longer meet the requirements for high-speed transmission, and they also suffer from problems such as heavy weight, high cost, and susceptibility to electromagnetic interference. Fiber optic communication has become the primary solution for high-bandwidth, low-latency in-vehicle networks in the automotive industry.
[0004] However, due to the introduction of optical splitters in traditional PON links, and the high loss of optical splitters, both uplink and downlink optical links suffer from high losses. This requires lasers to be able to support higher optical power and optical receiving devices to be able to detect weaker signal light, which poses a great challenge to both optical transceivers and receivers.
[0005] After replacing copper wire bundles with fiber optic wire bundles, traditional PON links will use optical splitters. Due to the high loss of optical splitters, the current transmission power of optical transmitters and the detection sensitivity of optical receivers are limited. The link loss is close to or exceeds the budget, resulting in poor optical link quality and weak risk resistance.
[0006] Especially in automotive applications, optical transceivers need to meet the automotive-grade high-temperature operating requirement of 125°C and maintain continuous high-power optical output in a high-temperature environment of 125°C. This is a current challenge for automotive optical transceivers and also a problem that hinders the progress of fiber optics in vehicles. Summary of the Invention
[0007] This application provides an in-vehicle optical communication system, a signal transmission method, and a vehicle to solve the problem in the related technology that traditional PON links use optical splitters, which have high losses, resulting in poor optical link quality and weak risk resistance.
[0008] The first aspect of this application provides a vehicle-mounted optical communication system, including: The downlink optical link includes an optical line terminal, a downlink optical distribution component, and an on-board optical network unit connected sequentially via an optical transmission medium. The downlink optical distribution component is configured to distribute the downlink optical signal output by the optical line terminal into downlink split signals that are transmitted to each of the on-board optical network units. An uplink optical link includes an optical routing module connected between the downlink optical distribution component and the vehicle-mounted optical network unit, and an uplink optical aggregation component connected between the optical routing module and the optical line terminal. The optical routing module is configured to transmit the downlink split signal output by the downlink optical distribution component to the vehicle-mounted optical network unit, and transmit the uplink optical signal output by the vehicle-mounted optical network unit to the uplink optical aggregation component.
[0009] In some embodiments: the optical line terminal has an optical signal transmitter and an optical signal receiver, the downlink optical distribution component has a downlink signal input and multiple downlink signal outputs, and the vehicle-mounted optical network unit has an optical signal transceiver. The optical signal transmitter is connected to the downlink signal input terminal via an optical transmission medium, and the multiple downlink signal output terminals are connected to the optical signal transceiver terminals of each of the vehicle-mounted optical network units via an optical transmission medium.
[0010] In some embodiments: the uplink optical convergence component has multiple uplink signal input terminals and one uplink signal output terminal, and the optical routing module includes a first port, a second port and a third port; The first port is connected to the downlink signal output terminal, and the second port is connected to the optical signal transceiver terminal of the vehicle-mounted optical network unit. The third port is connected to the uplink signal input terminal, and the uplink signal output terminal is connected to the optical signal receiver terminal.
[0011] In some embodiments: the optical transmission medium includes a downlink optical fiber and an uplink optical fiber, the first port and the second port of the optical routing module are connected to the downlink optical fiber and transmit the downlink optical signal to the vehicle optical network unit, and the third port of the optical routing module is connected to the uplink optical fiber and transmits the uplink optical signal to the uplink optical aggregation component.
[0012] In some embodiments, the optical routing module is one of an optical circulator, a wavelength division multiplexer, or an optical switch; When the optical routing module is the wavelength division multiplexer, the downlink optical signal and the uplink optical signal have different operating wavelengths, and the wavelength division multiplexer is configured to separate the downlink optical signal and the uplink optical signal to different ports according to the wavelength.
[0013] In some embodiments: the downlink optical distribution component is a 1:N optical splitter, the uplink optical convergence component is an N:1 optical combiner, wherein N is greater than or equal to 2, and N is less than or equal to the total number of the vehicle optical network units, and the insertion loss of the uplink optical convergence component is lower than the insertion loss of the downlink optical distribution component when used in reverse.
[0014] A second aspect of this application provides a signal transmission method for a vehicle-mounted optical communication system, wherein the method uses the vehicle-mounted optical communication system described in any of the above embodiments, and the method includes: The optical line terminal sends downlink optical signals, which are then power-distributed by the downlink optical distribution component and transmitted to the vehicle-mounted optical network unit via the optical routing module. The vehicle-mounted optical network unit receives the downlink optical signal and generates an uplink optical signal, and the vehicle-mounted optical network unit sends the uplink optical signal to the optical routing module; The optical routing module directs the uplink optical signal to the uplink optical aggregation component according to the preset optical path allocation logic; The uplink optical convergence component aggregates uplink optical signals from multiple vehicle-mounted optical network units and transmits them to the optical line terminal.
[0015] In some embodiments, the method further includes the following steps: The optical line terminal assigns a unique identifier ID and a corresponding uplink transmission time slot to each vehicle-mounted optical network unit; The vehicle-mounted optical network unit only activates the laser to transmit the uplink optical signal during the corresponding uplink transmission time slot, so as to avoid signal conflicts by using time division multiple access.
[0016] In some embodiments, the method further includes a power consumption control step: Monitor vehicle operating status and ambient temperature sensor data; When the vehicle is in operation and the ambient temperature is detected to be higher than a preset temperature threshold, the laser drive current of the vehicle optical network unit is reduced and the protection interval of the uplink optical signal transmission time slot is extended to compensate for the performance degradation of optical devices caused by the increase in temperature.
[0017] A third aspect of this application provides a vehicle that includes the vehicle-mounted optical communication system described in any of the above embodiments.
[0018] The beneficial effects of the technical solution provided in this application include: This application provides an in-vehicle optical communication system, a signal transmission method, and a vehicle. The in-vehicle optical communication system includes a downlink optical link comprising an optical line terminal (OLT), a downlink optical distribution component, and an in-vehicle optical network unit (ONU) connected sequentially via an optical transmission medium. The downlink optical distribution component is configured to distribute the downlink optical signal output from the OLT into downlink split signals for transmission to each ONU. An uplink optical link is also provided, comprising an optical routing module connected between the downlink optical distribution component and the ONU, and an uplink optical aggregation component connected between the optical routing module and the OLT. The optical routing module is configured to transmit the downlink split signals output from the downlink optical distribution component to the ONU, and transmit the uplink optical signals output from the ONU to the uplink optical aggregation component.
[0019] Therefore, the vehicle-mounted optical communication system of this application adds an uplink optical link to the downlink optical link. This uplink optical link includes an optical routing module between the downlink optical distribution component and the vehicle-mounted optical network unit (VNR), and an uplink optical aggregation component between the optical routing module and the optical line terminal (OLT). The optical routing module can transmit not only the downlink split signal output from the downlink optical distribution component to the VNR, but also the uplink optical signal output from the VNR to the uplink optical aggregation component. The uplink optical aggregation component then transmits the uplink optical signal to the OLT. The uplink optical signal output from the VNR bypasses the downlink optical distribution component, which has significant insertion loss, and instead passes sequentially through the optical routing module and the uplink optical aggregation component to the OLT, reducing the substantial optical power loss caused by the downlink optical distribution component and thus lowering the overall optical loss of the uplink optical link. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the optical line terminal according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the vehicle-mounted optical network unit according to an embodiment of this application; Figure 4 This is a schematic diagram of the downlink optical distribution component in an embodiment of this application; Figure 5 This is a schematic diagram of the optical routing module in an embodiment of this application; Figure 6This is a schematic diagram of the uplink optical converging component in an embodiment of this application; Figure 7 This is a schematic diagram showing the flow of uplink and downlink optical signals in an embodiment of this application.
[0022] Figure label: 1. Optical Line Terminal; 2. Vehicle-mounted Optical Network Unit; 3. Downlink Optical Distribution Component; 4. Optical Routing Module; 5. Uplink Optical Aggregator Component; 6. Optical Transmission Medium; 101. Optical Signal Transmitter; 102. Optical Signal Receiver; 201. Optical Signal Transceiver; 301. Downlink Signal Input; 302. Downlink Signal Output; 401. First Port; 402. Second Port; 403. Third Port; 501. Uplink Signal Input; 502. Uplink Signal Output. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0024] This application provides an in-vehicle optical communication system, a signal transmission method, and a vehicle, which can solve the problem in the related technology that traditional PON links use optical splitters, and due to the high loss of optical splitters, the optical link quality is poor and the risk resistance is weak.
[0025] See Figure 1 and Figure 7 As shown, the first aspect of this application provides a vehicle-mounted optical communication system, including: The downlink optical link includes an optical line terminal 1, a downlink optical distribution component 3, and two or more vehicle-mounted optical network units 2 connected sequentially via an optical transmission medium 6. The downlink optical distribution component 3 is configured to distribute the downlink optical signal output by the optical line terminal 1 into two or more downlink split signals that are transmitted to each vehicle-mounted optical network unit 2.
[0026] The uplink optical link includes an optical routing module 4 connected between the downlink optical distribution component 3 and each vehicle-mounted optical network unit 2, and an uplink optical aggregation component 5 connected between each optical routing module 4 and the optical line terminal 1.
[0027] The optical routing module 4 is configured to transmit two or more downlink split optical signals output by the downlink optical distribution component 3 to the corresponding vehicle-mounted optical network unit 2, and transmit two or more uplink optical signals output by the vehicle-mounted optical network unit 2 to the uplink optical aggregation component 5. The uplink optical aggregation component 5 then combines the uplink optical signals and transmits them to the optical line terminal 1.
[0028] The vehicle-mounted optical communication system of this application embodiment adds an uplink optical link on the basis of the downlink optical link. The uplink optical link sets up an optical routing module 4 between the downlink optical distribution component 3 and the vehicle-mounted optical network unit 2, and sets up an uplink optical aggregation component 5 between the optical routing module 4 and the optical line terminal 1.
[0029] The optical routing module 4 can not only transmit the downlink split signal output by the downlink optical distribution component 3 to the vehicle-mounted optical network unit 2, but also transmit the uplink optical signal output by the vehicle-mounted optical network unit 2 to the uplink optical aggregation component 5. Finally, the uplink optical aggregation component 5 transmits the uplink optical signal to the optical line terminal 1.
[0030] The uplink optical signal output by the vehicle-mounted optical network unit 2 does not pass through the downlink optical distribution component 3, which has a large insertion loss, but is transmitted to the optical line terminal 1 through the optical routing module 4 and the uplink optical aggregation component 5 in sequence. This reduces the huge optical power loss caused by the downlink optical distribution component 3, thereby reducing the optical loss of the entire uplink optical link.
[0031] This embodiment of the application reduces the uplink optical link loss by using the optical routing module 4 and the uplink optical aggregation component 5, thereby reducing the power requirements of the laser in the vehicle-mounted optical network unit 2 and lowering its manufacturing difficulty and cost. This, in turn, reduces the power consumption and heat generation of the vehicle-mounted optical network unit 2 to a certain extent, further reducing the difficulty of heat dissipation design for terminals such as in-vehicle cameras, and reducing the overall vehicle power consumption.
[0032] In some alternative embodiments: see Figures 1 to 7 As shown in the figure, this application provides a vehicle-mounted optical communication system. The optical line terminal 1 of the vehicle-mounted optical communication system has an optical signal transmitter 101 and an optical signal receiver 102. The optical signal transmitter 101 can convert electrical signals into laser signals and transmit them, and the optical signal receiver 102 can convert the received laser signals into electrical signals.
[0033] The downlink optical distribution component 3 has one downlink signal input terminal 301 and multiple downlink signal output terminals 302. The downlink optical distribution component 3 can distribute the optical signal received from the downlink signal input terminal 301 to each downlink signal output terminal 302 according to power. The downlink optical distribution component 3 can also output the optical signal received from each downlink signal output terminal 302 from the downlink signal input terminal 301.
[0034] The vehicle-mounted optical network unit 2 has an optical signal transceiver 201, which can convert received optical signals into electrical signals and vice versa. The optical signal transmitter 101 is connected to the downlink signal input 301 through the optical transmission medium 6, and multiple downlink signal outputs 302 are connected to the optical signal transceiver 201 of each vehicle-mounted optical network unit 2 through the optical transmission medium 6.
[0035] The uplink optical convergence component 5 has multiple uplink signal input terminals 501 and one uplink signal output terminal 502. Optical signals input from different uplink signal input terminals 501 can all be output from the uplink signal output terminal 502. The optical routing module 4 includes a first port 401, a second port 402, and a third port 403.
[0036] The optical routing module 4 can transmit the optical signal input from the first port 401 to the second port 402, and can also transmit the optical signal input from the second port 402 to the third port 403; however, the optical signal input from the second port 402 cannot reach the first port 401.
[0037] The first port 401 is connected to the downlink signal output terminal 302, and the second port 402 is connected to the optical signal transceiver terminal 201 of the vehicle-mounted optical network unit 2. The third port 403 is connected to the uplink signal input terminal 501, and the uplink signal output terminal 502 is connected to the optical signal receiver terminal 102.
[0038] The optical signal transmitter 101 of the optical line terminal 1 is connected to the downlink signal input terminal 301 of the downlink optical distribution component 3 through the optical transmission medium 6; each downlink signal output terminal 302 of the downlink optical distribution component 3 is connected to the first port 401 of each optical routing module 4 through the respective optical transmission medium 6.
[0039] The second port 402 of each optical routing module 4 is connected to the optical signal transceiver 201 of each vehicle-mounted optical network unit 2 through each optical transmission medium 6; the third port 403 of each optical routing module 4 is connected to each uplink signal input 501 of the uplink optical aggregation component 5 through each optical transmission medium 6; the uplink signal output 502 of the uplink optical aggregation component 5 is connected to the optical signal receiver 102 of the optical line terminal 1 through the optical transmission medium 6.
[0040] When downlink transmission signals are required, the optical signal generated by the optical signal transmitter 101 of the optical line terminal 1 is transmitted to the downlink optical distribution component 3 through the optical transmission medium 6. After the optical power is distributed by the downlink optical distribution component 3, it is output from each downlink signal output terminal 302 and transmitted to the first port 401 of each optical routing module 4 through each optical transmission medium 6. It is then output from the second port 402 of each optical routing module 4 and transmitted to the optical signal transceiver 201 of each vehicle-mounted optical network unit 2 through each optical transmission medium 6. Inside the optical signal transceiver 201, it is converted into an electrical signal.
[0041] When uplink transmission signals are required, the optical signal transceiver 201 of each vehicle-mounted optical network unit 2 generates an optical signal, which is transmitted to the second port 402 of the optical routing module 4 through each optical transmission medium 6, and output from the third port 403 of the optical routing module 4. It is then transmitted to each uplink signal input terminal 501 through each optical transmission medium 6, and output from the uplink signal output terminal 502 of the uplink optical aggregation component 5. Finally, it is transmitted to the optical signal receiving terminal 102 of the optical line terminal 1 through the optical transmission medium 6, where it is converted into an electrical signal.
[0042] In some alternative embodiments: see Figure 1 and Figure 7 As shown, this application embodiment provides a vehicle-mounted optical communication system. The optical transmission medium 6 of the vehicle-mounted optical communication system includes a downlink optical fiber and an uplink optical fiber. The first port 401 and the second port 402 of the optical routing module 4 are connected to the downlink optical fiber and transmit the downlink optical signal to the vehicle-mounted optical network unit 2. The third port 403 of the optical routing module 4 is connected to the uplink optical fiber and transmits the uplink optical signal to the uplink optical aggregation component 5.
[0043] The optical routing module 4 is one of an optical circulator, wavelength division multiplexer, or optical switch. When the optical routing module 4 is a wavelength division multiplexer, the downlink optical signal and the uplink optical signal have different operating wavelengths. For example, the wavelength of the downlink optical signal is λ1 and the wavelength of the uplink optical signal is λ2. The wavelength division multiplexer is configured to separate the downlink optical signal and the uplink optical signal to different ports according to the wavelength.
[0044] In some alternative embodiments: see Figure 1 and Figure 7 As shown, this application provides a vehicle-mounted optical communication system. The downlink optical distribution component 3 of the vehicle-mounted optical communication system is a 1:N optical splitter, and the uplink optical aggregation component 5 is an N:1 optical combiner, wherein N is greater than or equal to 2 and N is less than or equal to the total number of vehicle-mounted optical network units 2. The insertion loss of the uplink optical aggregation component 5 is lower than the insertion loss of the downlink optical distribution component 3 when used in reverse.
[0045] See Figures 1 to 7As shown, a second aspect of this application provides a signal transmission method for a vehicle-mounted optical communication system. The method uses the vehicle-mounted optical communication system described in any of the above embodiments, and includes: Step 101: Optical line terminal 1 sends downlink optical signal. After the downlink optical signal is power-distributed by downlink optical distribution component 3, it is transmitted to vehicle-mounted optical network unit 2 via the first port 401 and the second port 402 of optical routing module 4.
[0046] Step 102: The vehicle-mounted optical network unit 2 receives the downlink optical signal and generates the uplink optical signal. The vehicle-mounted optical network unit 2 sends the uplink optical signal to the second port 402 of the optical routing module 4.
[0047] Step 103: According to the preset optical path allocation logic, the optical routing module 4 transmits the uplink optical signal from the second port 402 to the third port 403 and then directs it to the uplink optical aggregation component 5.
[0048] Step 104: The uplink optical aggregation component 5 aggregates the uplink optical signals from multiple vehicle-mounted optical network units 2 and transmits them to the optical line terminal 1.
[0049] In some alternative embodiments, see Figure 1 and Figure 7 As shown in the figure, this application provides a signal transmission method for a vehicle-mounted optical communication system, the method further including the following steps: Step 201: Optical line terminal 1 assigns a unique identifier ID and a corresponding uplink transmission time slot to each vehicle-mounted optical network unit 2.
[0050] Step 202: The vehicle-mounted optical network unit 2 only turns on the laser to send uplink optical signals in the corresponding uplink transmission time slot, so as to avoid signal conflicts by using time division multiple access.
[0051] In this embodiment, the downlink optical signal generated by the optical line terminal 1 contains the ID information of its target vehicle-mounted optical network unit 2. The downlink optical signal is transmitted to each vehicle-mounted optical network unit 2 without discrimination through the optical transmission medium 6, downlink optical distribution component 3, and optical routing module 4. When the ID information in the downlink optical signal received by each vehicle-mounted optical network unit 2 matches its own, the signal is processed; otherwise, it is discarded.
[0052] When uplink transmission of signals is required, the optical line terminal 1 assigns a unique time interval to each vehicle-mounted optical network unit 2 for signal uploading. When the time interval belongs to the corresponding vehicle-mounted optical network unit 2, the optical signal transceiver 201 of the vehicle-mounted optical network unit 2 generates an optical communication signal, which is transmitted to the optical signal receiver 102 of the optical line terminal 1 through the optical transmission medium 6, the optical routing module 4, and the uplink optical aggregation component 5, and then processed.
[0053] In some alternative embodiments, see Figure 1 and Figure 7 As shown in the figure, this application provides a signal transmission method for a vehicle-mounted optical communication system, the method further including a power consumption control step: Step 301: Monitor the vehicle's operating status and the data from the ambient temperature sensor.
[0054] Step 302: When the vehicle is in operation and the ambient temperature is detected to be higher than the preset temperature threshold, reduce the laser driving current of the vehicle optical network unit 2 and extend the protection interval of the uplink optical signal transmission time slot to compensate for the performance degradation of optical devices caused by the temperature rise.
[0055] A third aspect of this application provides a vehicle that includes the vehicle-mounted optical communication system described in any of the above embodiments.
[0056] Working principle This application provides an in-vehicle optical communication system, a signal transmission method, and a vehicle. The in-vehicle optical communication system includes a downlink optical link comprising an optical line terminal 1, a downlink optical distribution component 3, and an in-vehicle optical network unit 2 connected sequentially via an optical transmission medium 6. The downlink optical distribution component 3 is configured to distribute the downlink optical signal output from the optical line terminal 1 into downlink split signals for transmission to each in-vehicle optical network unit 2. An uplink optical link includes an optical routing module 4 connected between the downlink optical distribution component 3 and the in-vehicle optical network unit 2, and an uplink optical aggregation component 5 connected between the optical routing module 4 and the optical line terminal 1. The optical routing module 4 is configured to transmit the downlink split signals output from the downlink optical distribution component 3 to the in-vehicle optical network unit 2, and transmit the uplink optical signals output from the in-vehicle optical network unit 2 to the uplink optical aggregation component 5.
[0057] Therefore, the vehicle-mounted optical communication system of this application adds an uplink optical link to the downlink optical link. This uplink optical link includes an optical routing module 4 between the downlink optical distribution component 3 and the vehicle-mounted optical network unit 2, and an uplink optical aggregation component 5 between the optical routing module 4 and the optical line terminal 1. The optical routing module 4 can transmit not only the downlink split signal output from the downlink optical distribution component 3 to the vehicle-mounted optical network unit 2, but also the uplink optical signal output from the vehicle-mounted optical network unit 2 to the uplink optical aggregation component 5. The uplink optical aggregation component 5 then transmits the uplink optical signal to the optical line terminal 1. The uplink optical signal output from the vehicle-mounted optical network unit 2 bypasses the downlink optical distribution component 3, which has a high insertion loss, and instead passes sequentially through the optical routing module 4 and the uplink optical aggregation component 5 to the optical line terminal 1. This reduces the significant optical power loss caused by the downlink optical distribution component 3, thereby reducing the overall optical loss of the uplink optical link.
[0058] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0059] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A vehicle-mounted optical communication system, characterized in that, include: Downlink optical link, the downlink optical link includes an optical line terminal (1), a downlink optical distribution component (3) and a vehicle-mounted optical network unit (2) connected in sequence through an optical transmission medium (6), the downlink optical distribution component (3) is configured to: distribute the downlink optical signal output by the optical line terminal (1) into downlink split signals transmitted to each of the vehicle-mounted optical network units (2); The uplink optical link includes an optical routing module (4) connected between the downlink optical distribution component (3) and the vehicle-mounted optical network unit (2), and an uplink optical aggregation component (5) connected between the optical routing module (4) and the optical line terminal (1). The optical routing module (4) is configured to transmit the downlink split signal output by the downlink optical distribution component (3) to the vehicle-mounted optical network unit (2) and transmit the uplink optical signal output by the vehicle-mounted optical network unit (2) to the uplink optical aggregation component (5).
2. The vehicle-mounted optical communication system as described in claim 1, characterized in that: The optical line terminal (1) has an optical signal transmitter (101) and an optical signal receiver (102), the downlink optical distribution component (3) has a downlink signal input (301) and multiple downlink signal outputs (302), and the vehicle-mounted optical network unit (2) has an optical signal transceiver (201). The optical signal transmitter (101) is connected to the downlink signal input terminal (301) through the optical transmission medium (6), and the multiple downlink signal output terminals (302) are connected to the optical signal transceiver terminals (201) of each of the vehicle-mounted optical network units (2) through the optical transmission medium (6).
3. The vehicle-mounted optical communication system as described in claim 2, characterized in that: The uplink optical convergence component (5) has multiple uplink signal input terminals (501) and one uplink signal output terminal (502), and the optical routing module (4) includes a first port (401), a second port (402) and a third port (403). The first port (401) is connected to the downlink signal output terminal (302), and the second port (402) is connected to the optical signal transceiver terminal (201) of the vehicle-mounted optical network unit (2). The third port (403) is connected to the uplink signal input terminal (501), and the uplink signal output terminal (502) is connected to the optical signal receiver terminal (102).
4. The vehicle-mounted optical communication system as described in claim 3, characterized in that: The optical transmission medium (6) includes a downlink optical fiber and an uplink optical fiber. The first port (401) and the second port (402) of the optical routing module (4) are connected to the downlink optical fiber and transmit the downlink optical signal to the vehicle optical network unit (2). The third port (403) of the optical routing module (4) is connected to the uplink optical fiber and transmits the uplink optical signal to the uplink optical aggregation component (5).
5. A vehicle-mounted optical communication system as described in any one of claims 1 to 4, characterized in that: The optical routing module (4) is one of an optical circulator, a wavelength division multiplexer, or an optical switch; When the optical routing module (4) is the wavelength division multiplexer, the downlink optical signal and the uplink optical signal have different operating wavelengths, and the wavelength division multiplexer is configured to separate the downlink optical signal and the uplink optical signal to different ports according to the wavelength.
6. A vehicle-mounted optical communication system as described in any one of claims 1 to 4, characterized in that: The downlink optical distribution component (3) is a 1:N optical splitter, and the uplink optical convergence component (5) is an N:1 optical combiner, wherein N is greater than or equal to 2 and N is less than or equal to the total number of the vehicle optical network units (2). The insertion loss of the uplink optical convergence component (5) is lower than the insertion loss of the downlink optical distribution component (3) when used in reverse.
7. A signal transmission method for a vehicle-mounted optical communication system, characterized in that, The method uses the vehicle-mounted optical communication system according to any one of claims 1 to 6, the method comprising: The optical line terminal (1) sends downlink optical signals. After the downlink optical signal is power-distributed by the downlink optical distribution component (3), it is transmitted to the vehicle-mounted optical network unit (2) via the optical routing module (4). The vehicle-mounted optical network unit (2) receives the downlink optical signal and generates an uplink optical signal. The vehicle-mounted optical network unit (2) sends the uplink optical signal to the optical routing module (4). The optical routing module (4) directs the uplink optical signal to the uplink optical aggregation component (5) according to the preset optical path allocation logic. The uplink optical aggregation component (5) aggregates the uplink optical signals from multiple vehicle-mounted optical network units (2) and transmits them to the optical line terminal (1).
8. The signal transmission method of a vehicle-mounted optical communication system as described in claim 7, characterized in that, The method further includes the following steps: The optical line terminal (1) assigns a unique identifier ID and a corresponding uplink transmission time slot to each vehicle-mounted optical network unit (2); The vehicle-mounted optical network unit (2) only turns on the laser to send the uplink optical signal in the corresponding uplink transmission time slot, so as to avoid signal conflict by using time division multiple access.
9. The signal transmission method of a vehicle-mounted optical communication system as described in claim 8, characterized in that, The method also includes a power consumption control step: Monitor vehicle operating status and ambient temperature sensor data; When the vehicle is in operation and the ambient temperature is detected to be higher than the preset temperature threshold, the laser driving current of the vehicle optical network unit (2) is reduced and the protection interval of the optical signal transmission time slot is extended to compensate for the performance degradation of the optical device caused by the temperature rise.
10. A vehicle, characterized in that, The vehicle includes the vehicle-mounted optical communication system as described in any one of claims 1 to 6.