A pair of data optical fiber transmission equipment based on CPLD is designed and developed. The video, gigabit network, RS422 and other multi-channel data are formed into high-speed data stream, and then the multi-channel digital stream is carried out wavelength division multiplexing and transmitted through the transceiver integrated optical terminal machine. The receiving optical terminal is demultiplexed and restored to multiplex individual digital signals, At full load, one channel of video, two channels of gigabit networks and five channels of RS422 are transmitted. Duo to the complex application environment of the optical terminal computer, the state of bidirectional data transmission information needs to be reported in real time. In this paper, a real-time fault detection method is designed for the entire optical fiber transmission link. The video locking state of optical terminal machine, the output voltage state of linear voltage regulator and the transmission fiber between two optical terminal machines are monitored in real time and is applied to a certain type of vehicle photoelectric system. The fault location is accurate and timely, and the application effect is good.
KEYWORDS: Telecommunications, Data communications, Data transmission, Control systems, Data conversion, Data storage, System integration, Optical fibers, Field programmable gate arrays, Signal processing
Aiming at the characteristics of the self-designed and developed fiber tree bus (FTB) terminal, such as more terminals, more interactive data and various node communication protocols, This paper designs an efficient bus controller, a practical and efficient instruction list, and Constructs A high-speed data transmission system, which is used to manage and control the data transmitted on the fiber bus. FTB layered structure, bus topology and the performance of real-time transmission are introduced. According to the application requirements of military vehicle-borne photoelectric system, the model of photoelectric information transmission system based on FTB is built, and the transmission performance of FTB based on this bus controller is tested. The compared results of analysis and test show that, FTB has a variety of real-time information transmission capacity, but also verified that the bus controller is efficient and practical,Finally, Transmission Delay Index and information interaction index are analyzed and tested.
Optical fiber bus technology is an important research direction in communication systems of electronic devices in special vehicle platforms. According to the requirements for communication quality between devices in special vehicle platforms, an optical fiber bus based on gigabit passive optical network topology is proposed. A data cache-based predictive weighted interpolated polling dynamic bandwidth allocation method is presented and investigated for the optical fiber bus’s upstream bandwidth allocation. The network controller establishes a weighted buffer area for the communication requirements in the polling period according to the type and data volume of the network terminal (NT) data stream and dynamically allocates the bandwidth of each optical NT to better meet the communication requirements for different data within the special device platform. Verification is done by means of OPNET software simulation and the establishment of a NT simulation test system in the laboratory. This proves that the proposed dynamic bandwidth allocation algorithm can reduce the end-to-end delay of RS422 port data by more than 50% and meet the Ethernet and controller area network port data delay requirements.
KEYWORDS: Optical fibers, Data transmission, Data communications, Time division multiplexing, Optical communications, Optical networks, Field programmable gate arrays, Passive optical networks, Fiber optic communications, Control systems
Passive Optical Network (PON), which possess the advantages of high efficiency, high speed and high bandwidth utilization, is a type of fiber channel technology that acquires the most concern. As a type of key technology in military weapon electronic system, the target of fiber channel data bus is to offer actual-time, high-speed and reliable communication link between instruments. In this article, a type of fiber channel data bus, which is based on PON topology, is raised and elaborated. The elaboration is concentrated on the designation of the topology and protocol used in the fiber channel data bus. On this basis, the research emphasis is the upstream Media Access Control (MAC) layer in the Network Terminal (NT) of the fiber channel data bus which is designed. Firstly, the upstream synchronization method and frame structure in GPON standards are analysed. Then, the upstream MAC layer control is actualized through Xilinx FPGA devices.
This paper first briefly describes the transport protocol, topology, technical characteristics and application status of the typical military electronic system MIL-STD-1553B bus. With respect to defects such as the bus bandwidth shortage, limited fault tolerance and complicated maintaining, this paper proposes a PON architecture based bus-type optical fiber data bus (FTB) technology with high bandwidth, low latency and strong fault tolerance. This paper mainly studies the bus topology based on the passive optical network (PON) architecture, the physical layer design based on burst mode laser drive circuit (BM-LDD) as well as the digital burst automatic power control circuit, and the design based on multi-point control protocol (MPCP) of time-division response mode. The designed optical fiber bus provides real-time, high-speed and highly reliable communication links for information exchange (video, audio, radar, distributed sensor data, etc.) between various electronic systems of military weapons. It can also accumulate technology for engineering application of optical fiber data bus technology.
In the indoor visible light communication (VLC) system, the light source has the dual function of illumination and communication. Due to the different size of indoor space and indoor facilities, it will inevitably lead to different indoor light power distribution. In order to achieve the optimal communication effect, the layout of the light source must be reasonably designed so that the receiving power distribution is relatively uniform on the same horizontal plane in the room. The current layout methods are mostly based on the square plane three-dimensional space, while the layout methods of the rectangular plane three-dimensional space are rarely studied. In this paper, a room with size 5m×4m×3m is used as a model. Firstly, according to the shock response principle, the optimal layout of four LED lights is obtained through theoretical calculations, so that the received light power fluctuation in the z=h plane in this room is minimized. Then, according to a set of simulation parameters, the theoretical optimal layout with the minimum fluctuation of receiving optical power in the h=0.75m plane in the room is calculated, and then Matlab is used to simulate the received optical power distribution of the plane under different layouts. The simulation results are consistent with the theoretical calculations. Finally, the illumination distribution under the optimal layout is calculated to verify that the designed optimal layout meets the international illumination standards. The light source layout model designed in this paper not only meets the illumination standards, but also ensures the reliability of communication. It provides an optimization method for the layout of indoor visible light communication LED light source.
KEYWORDS: Data communications, Telecommunications, Fiber optics, Data transmission, Interfaces, Optical communications, Systems modeling, Optical fibers, System integration, Network architectures
A new kind of fiber optic data bus (fiber tree bus, FTB) is presented, mainly aiming at some defects of available standard bus, which is lack of real-time performance, has no information interactive transmission index, and uncontrollable transmission delay when it is applied in high bandwidth, distributed real-time information transmission and interactive conditions. The internal working mode, tree topology and Transfer protocol of FTB are designed. The main technical characteristics and real-time transmission performance of FTB are introduced in details. A photoelectric information transmission system has been established based on FTB, to meet the application requirements of the military vehicle-borne photoelectric system. It can access and transmit a variety of communication data at the same time, such as Gigabit Network, CAN, RS232, RS485, RS422, SDI, etc. The compared results of analysis and test show that the new bus system is capable of transferring a various types of real-time information. The characteristics and advantages of FTB application are summarized finally.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.