Fiber duplex communication system with the function of driving circuit is convert electric power into light power, and will transfer the signal modulation on the output of the light source, its light source at the same time provide the bias current and varies with the digital signal modulation current. The 2018 special optical fiber lighting LED drive circuit must first consider the current peak of the driving LED, if more than the peak of the Red green blue light fiber lighting luminescence signal will produce the overflush phenomenon. In addition, the effect of the electric signal caused by the receiver, and the influence of the noise from the amplifiers, can be used to detect the threshold of the comparator and cause the error. At the same time LED light source module One extinguishing is more difficult than lighting up, it can produce a trailing phenomenon, especially when the serial drive circuit is used. The parallel drive can provide a low impedance channel for the carrier in the LED, thus reducing the pulse width distortion and slow trailing.

2018 special fiber optic lighting drive circuit resistance of RSI is used to adjust the fiber output power, pay attention to no more than Red green blue light fiber lighting the peak or light signals will produce overshoot phenomenon. In addition, SN75451 in the circuit has the characteristics of low impedance and high current rate, avoiding the long trailing phenomenon. Pulse width distortion (PWD) is a major factor limiting the speed of optical fiber link, which is caused by the delay of transmission delay between input and output. Notice that PWD is always positive, so we can use the RC circuit to delay the lighting of the LED light source module.

The 2018 special optical fiber lighting receiving circuit is an important part of the optical fiber communication system, and its performance is a comprehensive reflection of the performance of the whole Red green blue light fiber lighting Its effect is to convert the optical signal transmitted by the optical fiber into electrical signals, and then the original signal of the transmitter can be recovered by amplifying, balancing and ruling the circuit. In the line of optical fiber transmission line, the use of light signal is used to represent "1" and "0" code, so as to avoid the length of "0" or "1" in the code flow, which is beneficial to the extraction of the clock, and the coding circuit is needed. At the same time, the LED light source module array signal processor delivers parallel data, which requires the rate and conversion circuit.

2018 special fiber optic lighting part for the performance of the transceiver depends on PCB layout and wiring technology, so you should observe the following some basic rules: 1) design of PCB, it is recommended to use formation in order to reduce the power of public ground inductance. If a layer and a power layer are used at the same time, this will reduce the inductance of both ground and power pins. The division and opening of the formation and power layer should be minimal, which will reduce the additional inductance and improve the stability of the transmitting and receiving circuits. The connection length between the driving circuit and the LED should be reduced to minimize wire inductance. The ceramic capacitors of the tantalum electrolytic capacitance and 0.1 mu F of the 10 mu F should be placed near the driving LED signal, which will reduce the noise of the emitter radiation and improve the LED's light response time. The by-pass capacitance of 0.1mu F (or 0.01 mu F) is due to the receiver's tube foot 2 and 7, which cannot exceed the receiver's distance by 20mm. Therefore, it is recommended to use the Red green blue light fiber lighting surface to install the device, not to use the socket. After the actual test, the circuit is proved to meet the practical requirement, and the performance index of the whole LED light source module system is improved by shortening the time of communication

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