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FIBER FIBER OPTIC ENCODER LINK TRANSMITTER FIBER FIBER FIBER OPTIC ENCODER LINK RECEIVER
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NOISE IMMUNE 3300 FEET 5 Mbit/CHANNEL
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FIGURE 3.33 Three-channel optical link.
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the basic building block for more complex links. Figure 3.33 provides an example of a 5-Mbit three-channel link used to transmit encoder signals from a servomotor to a remote destination.
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Digital Links Carrier-Based
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A carrier-based digital link is a system in which the frequency of the optical carrier is varied by a technique known as frequency-shift keying (FSK). Figure 3.34 illustrates the modulation concept; two frequencies are employed to create the logic 0 and 1 states. This scheme is especially useful in systems where electrical handshaking (confirmation of reception and acceptance) is employed. Presence of the optical carrier is the equivalent of the handshake signal, with the data signal presented by frequency. Figure 3.35 illustrates a system where the logic of the fiber-optic line driver recognizes the optical carrier to create a handshake between terminal and processor. Additionally, since the processor is capable of recognizing only one terminal, the carrier is controlled to deny the handshake to all other terminals once one terminal is actively on-line to the processor.
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FIGURE 3.34 Modulation concept.
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Active Handshake Carrier Processor Fiber Optic Line Driver Fiber Optic Line Driver Terminal
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Fiber Optic Cable Fiber Optic Line Driver Terminal
Fiber Optic Line Driver
Terminal
FIGURE 3.35
System employing optical carrier.
3.12.4 Analog Links
It is well-recognized that, in motion control and process measurement and control, transmitting analog information without distortion is important. Analog information can be dealt with in several ways using fiber optics. Analog data cannot easily be transmitted through light intensity variation. A number of external factors such as light source variation, bending losses in cable, and connector expansion with temperature can affect the amount of raw light energy reaching the detector. It is not practical to compensate for all such factors and deliver accurate analog data. A viable method of transmitting data is to use an unmodulated carrier whose frequency depends on the analog signal level. A more advanced means is to convert the analog data to digital data, where accuracy also is determined by the number of bits used, multiplex the digital bits into one stream, and use the pulsed digital link approach. Figure 3.36 illustrates a link in which this last approach is used to produce both digital and analog forms of the data at the output.
3.12.5 Video Links
Long-distance video transmission in industrial situations is easily disrupted by radiated noise and lighting. Repeaters and largediameter coaxial cables are often used for particularly long runs. The use of fiber optics as a substitute for coaxial cable allows propagation of noise-free video over long distances. Either an intensity- or
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TRANSMITTER RECEIVER FIBER A/D MUX XTMR RCVR DEMUX D/A
0 10 V ANALOG
DIGITAL BINARY OUTPUT 0 10 V ANALOG OUTPUT
FIGURE 3.36 Analog and digital data transmission.
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Camera
Fiber Optic Transmitter
Fiber Optic Receiver
Monitor
Fiber Optic Cable
75 Ohm Coaxial Cable
FIGURE 3.37 Fiber-optic video link.
frequency-modulated optical carrier signal is utilized as the transmission means over fiber. With intensity-modulated signals, it is mandatory that some sort of automatic gain control be employed to compensate for light degradation due to varying cable losses, splices, and so on. Figure 3.37 illustrates a typical fiber-optic video link in a machine-vision application.
Data Bus Networks
Wiring a system often causes serious problems for designers and communication system integrators regarding the choice of topology. The basic difference between fiber and wiring is that one normally does not splice or tap into fiber as one would with coaxial or twin axial cable to create a drop point.
Daisy Chain Data Bus
The simplest extension of a point-to-point data link is described in Fig. 3.38. It extends continuously from one drop point (node) to the next by using each node as a repeater. The fiber-optic line driver
Fiber Optics in Sensors and Control Systems
FIGURE 3.38 Point-to-point data link.
FIGURE 3.39
Daisy chain data bus.
illustrated in Fig. 3.35 is such a system, providing multiple access points from remote terminals to a programmable controller processor. A system with several repeater points is vulnerable to the loss of any repeater, and with it all downstream points, unless some optical bypass scheme is utilized. Figures 3.38 and 3.39 exhibit such a scheme.
Ring Coupler
A preferred choice among several current fiber-optic system designs is the token-passing ring structure. Signals are passed around the ring, with each node serving to amplify and retransmit. Care must be taken to provide for a node becoming nonoperational. This is usually handled by using some type of bypass switching technique, given that the system provides
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