Metro passenger information optical fiber transmission system based on MEMS optical switch

Abstract

The invention discloses a metro passenger information optical fiber transmission system based on MEMS optical switches, which comprises a broadcast controller, a PIS optical transceiver sending end, a plurality of PIS optical transceiver receiving ends and a plurality of display screens, MEMS modules are integrated in the PIS optical transceiver receiving ends, and the PIS optical transceiver receiving ends are in one-to-one correspondence with the display screens; the output end of the broadcast controller is electrically connected with the input end of the PIS optical transceiver transmitting end, the output end of the PIS optical transceiver transmitting end is electrically connected with the input ends of the MEMS modules through a plurality of groups of main link optical fibers and backup link optical fibers, and the output end of each MEMS module is electrically connected with the input end of each PIS optical transceiver receiving end. And the output end of the receiving end of each PIS optical transceiver is electrically connected with the input end of each display screen. According to the invention, the MEMS module is added to the receiving end of the PIS optical transceiver, so that the video content played by the display screen is not affected, the high stability and high reliability of the system are ensured, and the cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of subway passenger information transmission systems, and in particular to a subway passenger information optical fiber transmission system based on MEMS optical switches. Background Art

[0002] With the acceleration of urbanization, more and more cities have chosen to develop subways as an important part of urban public transportation under the background of dense population and increasing traffic pressure. Subways can not only effectively alleviate ground traffic congestion, but also greatly improve urban transportation efficiency. As an important part of urban public transportation, the stability and real-time performance of the subway's passenger information system are crucial to improving operational efficiency.

[0003] The passenger information system involves real-time data such as train operation status, arrival time, transfer information, etc., which can provide passengers with accurate travel guidance while ensuring timely update and accurate transmission of information. These systems can not only improve passengers' travel experience, but also help the dispatching center to monitor and adjust train operation in real time, improve subway operation efficiency, and ensure the safety and smoothness of the transportation system. Therefore, optimizing and upgrading the passenger information system and improving its stability and real-time performance have become key factors in improving the quality of urban subway services and meeting the growing urban transportation needs.

[0004] At present, most subway passenger information transmission systems still use traditional single optical fiber links for data transmission. In the single optical fiber link transmission mode, once the optical fiber link is damaged, the receiving end of the PIS (Passenger Information System, PIS) optical terminal will not be able to receive the signal, resulting in the display screen being unable to display relevant information normally, affecting the passenger's travel experience.

[0005] In order to solve the limitation of single fiber link transmission, the existing technology provides two dual fiber hot backup solutions. One solution is to combine video compression technology with Ethernet self-healing ring to achieve automatic switching when link failure occurs; the other solution is based on FPGA technology and uses its powerful processing power for backup and fault tolerance. However, the implementation cost of these two solutions is relatively expensive. Summary of the invention

[0006] To this end, the present application provides a subway passenger information optical fiber transmission system based on MEMS optical switches to solve the problems of unreliable single optical fiber link transmission and high cost of dual optical fiber hot backup in the prior art.

[0007] In order to achieve the above objectives, this application provides the following technical solutions:

[0008] A subway passenger information optical fiber transmission system based on MEMS optical switches, comprising a broadcast control, a PIS optical terminal transmitting end, a plurality of PIS optical terminal receiving ends and a plurality of display screens, wherein the PIS optical terminal receiving end is integrated with a MEMS module, and the PIS optical terminal receiving end corresponds to the display screen one by one; the output end of the broadcast control is electrically connected to the input end of the PIS optical terminal transmitting end, the output end of the PIS optical terminal transmitting end is electrically connected to the input ends of the plurality of MEMS modules through a plurality of groups of main link optical fibers and backup link optical fibers, the output end of each MEMS module is electrically connected to the input end of each PIS optical terminal receiving end, and the output end of each PIS optical terminal receiving end is electrically connected to the input end of each display screen;

[0009] Among them, the PIS optical terminal transmitter is used to receive the multimedia information sent by the broadcast control, and forward it to the PIS optical terminal receiver through the main link optical fiber and the MEMS module. The PIS optical terminal receiver converts the multimedia information into an HDMI electrical signal and outputs it to the display screen; the MEMS module always detects whether the main link optical fiber is normal. If the main link optical fiber is abnormal, it automatically switches to the backup link optical fiber.

[0010] Preferably, the output end of the broadcast control and the input end of the PIS optical terminal transmitting end are electrically connected via a high-definition multimedia interface.

[0011] Preferably, the broadcast control and the PIS optical terminal transmitting end are provided with five.

[0012] Preferably, one PIS optical terminal transmitting end corresponds to eight PIS optical terminal receiving ends.

[0013] Preferably, the output end of the PIS optical terminal receiving end is electrically connected to the input end of the display screen through a high-definition multimedia interface.

[0014] Preferably, the MEMS module is a 1X2 MEMS module.

[0015] Preferably, the MEMS module is an array composed of micromirrors.

[0016] Preferably, the MEMS module constantly detects whether the main link optical fiber has returned to normal, and automatically switches to the main link optical fiber if the main link optical fiber has returned to normal.

[0017] Compared with the prior art, this application has at least the following beneficial effects:

[0018] The present application provides a subway passenger information optical fiber transmission system based on MEMS optical switches, including broadcast control, a PIS optical terminal transmitter, multiple PIS optical terminal receivers and multiple display screens, wherein a MEMS module is integrated in the PIS optical terminal receiver, and the PIS optical terminal receiver corresponds to the display screen one by one; the output end of the broadcast control is electrically connected to the input end of the PIS optical terminal transmitter, and the output end of the PIS optical terminal transmitter is electrically connected to the input end of multiple MEMS modules through multiple groups of main link optical fibers and backup link optical fibers, and the output end of each MEMS module is electrically connected to the input end of each PIS optical terminal receiver, and the output end of each PIS optical terminal receiver is electrically connected to the input end of each display screen. The present application adds a MEMS module to the PIS optical terminal receiver, so that it can provide a 2-way optical fiber link interface. During the optical fiber transmission process, when the main link optical fiber signal is lost, the MEMS is used to quickly switch the optical link to the backup link optical fiber, and the optical fiber signal can automatically restore the signal to ensure that the video content played on the display screen is not affected, thereby ensuring the high stability and high reliability of the system at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0020] Figure 1 A schematic diagram of the structure of a subway passenger information optical fiber transmission system based on MEMS optical switches provided in this application. DETAILED DESCRIPTION

[0021] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0022] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0023] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this application are usually used to indicate the general relative position relationship for the purpose of intuitive understanding by referring to the drawings, and are not absolute limitations on the position relationship in the actual product.

[0024] Micro-Electro-Mechanical Systems (MEMS), MEMS optical switches are micro-optical devices that use micro-mechanical technology to achieve optical signal switching and routing switching. MEMS optical switches have many types, including 2×2, 1×N, N×N and other port configurations, and are widely used in optical fiber communication systems, such as optical cross-connect (OXC), optical add-drop multiplexing (OADM), etc.

[0025] The working principle of MEMS optical switch is: MEMS optical switch is an array of micro mirrors, which can be controlled by electrostatic or thermal drive mechanism to move between two or more positions. When the micro mirror is in a certain position, it can allow the light signal to pass; when the micro mirror moves to another position, it can block or change the path of the light signal.

[0026] MEMS optical switches have the following characteristics:

[0027] 1. Small size and low power consumption: MEMS optical switches usually have small size and low power consumption due to their miniaturization characteristics.

[0028] 2. Good scalability: MEMS technology allows a large number of micromirrors to be integrated on a single chip, making it easier to expand the number of ports.

[0029] 3. Fast response: The response time of MEMS optical switches can reach milliseconds, meeting the needs of high-speed optical communications.

[0030] 4. Low loss: MEMS optical switches generally have lower insertion loss than mechanical optical switches.

[0031] 5. High reliability: The micromirror of the MEMS optical switch can withstand up to hundreds of millions of switching times, ensuring long-term stable operation.

[0032] These characteristics of MEMS optical switches make them an indispensable component in modern optical communication systems, providing technical support for achieving more efficient and flexible optical networks.

[0033] MEMS optical switch application areas:

[0034] 1. Optical communication network: used to realize optical signal routing, protection and recovery in the network.

[0035] 2. Data center: Rapid switching and management of optical signals during high-speed data transmission.

[0036] 3. Fiber optic sensor: As a key component in the fiber optic sensing system, it realizes signal routing and processing.

[0037] 4. Optical test equipment: Routing and control of optical signals in automated optical test systems.

[0038] With the rapid development of optical communication technology, especially the construction of all-optical networks, MEMS optical switches have broad market prospects due to their high performance and reliability.

[0039] PIS (Passenger Information System, PIS for short) optical transceiver is a fiber optic transmission system used in subway passenger information system. PIS optical transceiver has the following functions:

[0040] 1. Signal transmission: PIS optical transceiver mainly transmits various multimedia information, including video, audio and data, over long distances through optical fiber. It can transmit multimedia signals from the control center to various stations and trains, ensuring that passengers can obtain accurate riding information, advertisements, news and other content in a timely manner. For example, the train timetable, station information, transfer guide, etc. are played on the display screen at the station, and video programs and arrival reminders are played on the display screen inside the train.

[0041] 2. Signal conversion: PIS optical transceiver can realize the conversion between optical signals and electrical signals. The signals of the control center usually exist in the form of electrical signals, and in the process of long-distance transmission, optical signals have higher stability and anti-interference. Therefore, PIS optical transceiver converts electrical signals into optical signals for transmission, and converts optical signals back to electrical signals after reaching the destination for use by display devices or other devices.

[0042] 3. Data communication: In addition to the transmission of multimedia information, the PIS optical transceiver can also realize data communication functions. For example, it can transmit status information and fault alarm information between the train and the control center, so that the control center can timely understand the operation of the train and conduct dispatch and management.

[0043] PIS optical transceiver has the following features:

[0044] 1. High reliability: Since the subway system has extremely high requirements for equipment reliability, PIS optical transceivers usually use high-quality components and advanced design technology to ensure stable operation in harsh environments. It has anti-electromagnetic interference, lightning protection, moisture resistance and other characteristics, and can adapt to the complex electromagnetic environment and climatic conditions in the subway system.

[0045] 2. Large-capacity transmission: The PIS system needs to transmit a large amount of multimedia information, so the PIS optical transceiver usually has a large transmission capacity. It can support the simultaneous transmission of multiple video, audio and data signals, meeting the high requirements for information transmission in the subway system.

[0046] 3. Strong real-time performance: Timely update of passenger information is crucial for the subway system. PIS optical transceiver can realize fast data transmission and processing, ensuring the real-time and accuracy of information. For example, train arrival information can be updated to the station display and the display inside the train within a few seconds, so that passengers can understand the running status of the train in time.

[0047] 4. Easy to manage and maintain: PIS optical transceivers usually have remote management and monitoring functions, which makes it convenient for operation and maintenance personnel to manage and maintain the equipment. Operation and maintenance personnel can remotely monitor the operating status of the equipment, perform parameter configuration and fault diagnosis through the network, and improve the maintenance efficiency and reliability of the equipment.

[0048] See also Figure 1 The present application provides a subway passenger information optical fiber transmission system based on MEMS optical switches, including a broadcast control, a PIS optical terminal transmitter, multiple PIS optical terminal receivers and multiple display screens, wherein a MEMS module is integrated in the PIS optical terminal receiver, and the MEMS module is a 1X2 MEMS module, and the PIS optical terminal receiver corresponds to the display screen one by one; the output end of the broadcast control is electrically connected to the input end of the PIS optical terminal transmitter, and the output end of the PIS optical terminal transmitter is electrically connected to the input end of multiple MEMS modules through multiple groups of main link optical fibers and backup link optical fibers, and the output end of each MEMS module is electrically connected to the input end of each PIS optical terminal receiver, and the output end of each PIS optical terminal receiver is electrically connected to the input end of each display screen.

[0049] Among them, the PIS optical terminal transmitter is used to receive the multimedia information sent by the broadcast control, and forward it to the PIS optical terminal receiver through the main link optical fiber and the MEMS module. The PIS optical terminal receiver converts the multimedia information into HDMI electrical signals and outputs them to the display screen; the MEMS module always detects whether the main link optical fiber is normal. If the main link optical fiber is abnormal, it will automatically switch to the backup link optical fiber.

[0050] It should be noted that the selection of MEMS optical switches needs to consider factors such as the size of the micromirror, the maximum deflection angle, the alignment accuracy of the optical fiber, and the coupling loss. In addition, it is also necessary to ensure the precise control of the micromirror and the stable positioning of the optical fiber. Specifically, when aligning the optical fiber, high-precision optical fiber alignment technology is required to ensure the effective coupling of the optical signal; when controlling the micromirror, a precise control mechanism is required to achieve fast and accurate movement of the micromirror; when managing the loss, the design needs to be optimized to reduce the loss of the optical signal during transmission.

[0051] Specifically, in this application, the output end of the broadcast control and the input end of the PIS optical terminal transmitter are electrically connected via a high-definition multimedia interface (HDMI). The output end of the PIS optical terminal receiver is also electrically connected to the input end of the display screen via a high-definition multimedia interface.

[0052] Specifically, the subway passenger information optical fiber transmission system based on MEMS optical switches provided by the present application can set the broadcast control and PIS optical terminal transmitter to five, or even expand more. One PIS optical terminal transmitter can correspond to eight PIS optical terminal receivers, one PIS optical terminal transmitter can convert electrical signals into 16 optical signals, and eight PIS optical terminal receivers can convert the received optical signals back into electrical signals. Correspondingly, eight MENS optical switches and eight PIS optical terminal receivers are combined to control the transmission path of the optical signal.

[0053] It should be noted that it is necessary to add a MEMS two-in-one module before the conventional optical module at the receiving end of the PIS optical terminal, and debug the MEMS module.

[0054] The present application provides a subway passenger information optical fiber transmission system based on MEMS optical switch. The improved PIS optical terminal receiving end is composed of two parts: one is a 2-in-1 MEMS module, and the other is a conventional PIS optical terminal receiving end. After adding the MEMS module, the receiving end of the PIS optical terminal has 2 optical fiber interfaces, each of which is connected to an optical fiber, 1 of which is the main link optical fiber and 1 of which is the backup link optical fiber. During normal operation, the main link optical fiber plays a role, the MEMS module receives the signal from the main link optical fiber, outputs it to the optical module of the PIS optical terminal receiving end, and then converts it into an HDMI electrical signal through the chip and outputs it to the display screen. The MEMS module will always detect whether the main link optical fiber is normal. If the main link optical fiber is not inserted, the optical fiber link is damaged, the optical fiber link light attenuation is too large, and other abnormal conditions occur, the MEMS module will automatically switch to the backup optical fiber link, and output the signal on the backup optical fiber link to the optical module of the PIS optical terminal receiving end, and then convert it into an HDMI electrical signal through the chip and output it to the display screen, thereby ensuring that the entire system will not cause the display screen to have no signal due to a failure of the main link optical fiber. When the main link fiber returns to normal, the MEMS module will detect it and automatically switch back to the main link fiber.

[0055] This application adds a 1X2 MEMS module to the receiving end of the existing PIS optical fiber transmission system, so that it can provide a 2-way optical fiber link interface. During the optical fiber transmission process, when the main link optical fiber signal is lost, MEMS is used to achieve rapid switching and control of the optical link, and switch to the backup link. The optical fiber signal can automatically restore the signal, thereby ensuring that the video content played on the display screen is not affected, ensuring the high stability and high reliability of the system. When the main link optical fiber returns to normal, the MEMS module can automatically switch to the main link for transmission. The entire system has low cost and is easy to promote.

[0056] In summary, the subway passenger information optical fiber transmission system based on MEMS optical switches provided in this application has the characteristics of automatic backup switching of dual optical fiber links, fast transmission speed, strong anti-interference ability, high stability, high reliability and low cost.

[0057] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A subway passenger information optical fiber transmission system based on MEMS optical switches, characterized in that: It includes a broadcast control, a PIS optical terminal transmitting end, a plurality of PIS optical terminal receiving ends and a plurality of display screens, wherein the PIS optical terminal receiving end is integrated with a MEMS module, and the PIS optical terminal receiving end corresponds to the display screen one by one; the output end of the broadcast control is electrically connected to the input end of the PIS optical terminal transmitting end, the output end of the PIS optical terminal transmitting end is electrically connected to the input end of the plurality of MEMS modules through a plurality of groups of main link optical fibers and backup link optical fibers, the output end of each MEMS module is electrically connected to the input end of each PIS optical terminal receiving end, and the output end of each PIS optical terminal receiving end is electrically connected to the input end of each display screen; Among them, the PIS optical terminal transmitter is used to receive the multimedia information sent by the broadcast control, and forward it to the PIS optical terminal receiver through the main link optical fiber and the MEMS module. The PIS optical terminal receiver converts the multimedia information into an HDMI electrical signal and outputs it to the display screen; the MEMS module always detects whether the main link optical fiber is normal. If the main link optical fiber is abnormal, it automatically switches to the backup link optical fiber.

2. The subway passenger information optical fiber transmission system based on MEMS optical switch according to claim 1 is characterized in that: The output end of the broadcast control and the input end of the PIS optical terminal transmitting end are electrically connected via a high-definition multimedia interface.

3. The subway passenger information optical fiber transmission system based on MEMS optical switch according to claim 1 is characterized in that: The broadcast control and the PIS optical terminal sending end are provided with five.

4. The subway passenger information optical fiber transmission system based on MEMS optical switch according to claim 3 is characterized in that: One PIS optical terminal transmitting end corresponds to eight PIS optical terminal receiving ends.

5. The subway passenger information optical fiber transmission system based on MEMS optical switch according to claim 1 is characterized in that: The output end of the PIS optical terminal receiving end is electrically connected to the input end of the display screen through a high-definition multimedia interface. 6 . According to the subway passenger information optical fiber transmission system based on MEMS optical switch according to claim 1 , the MEMS module is a 1×2 MEMS module.

7. According to the subway passenger information optical fiber transmission system based on MEMS optical switches as described in claim 1, the MEMS module is an array composed of micromirrors.

8. According to the subway passenger information optical fiber transmission system based on MEMS optical switch in claim 1, the MEMS module always detects whether the main link optical fiber has returned to normal, and automatically switches to the main link optical fiber if the main link optical fiber has returned to normal.

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