CN203289449U - Analog/digital modulation-demodulation optical fiber communication simple system - Google Patents
Analog/digital modulation-demodulation optical fiber communication simple system Download PDFInfo
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- CN203289449U CN203289449U CN2013203295443U CN201320329544U CN203289449U CN 203289449 U CN203289449 U CN 203289449U CN 2013203295443 U CN2013203295443 U CN 2013203295443U CN 201320329544 U CN201320329544 U CN 201320329544U CN 203289449 U CN203289449 U CN 203289449U
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Abstract
The utility model provides an analog/digital modulation-demodulation optical fiber communication simple system comprising a modulation module, an optical sending module, a transmission optical fiber, an optical receiving module and a demodulation module. An input signal is subjected to modulation processing by the modulation module and then connected with the optical sending module. The optical sending module is connected with the optical receiving module through the transmission optical fiber. The signal received by the optical receiving module is demodulated by the demodulation module and then outputted. According to the analog/digital modulation-demodulation optical fiber communication simple system, the analog/digital modulation-demodulation is performed on the inputted signal, and then the optical fiber communication is combined so that the analog/digital optical fiber communication system is established. With the processing of the analog/digital modulation-demodulation module, error rate produced in information transmission process can be lowered. The optical fiber communication can provide channels which are large in capacity, low in error and rapid in transmission speed. With the system established by combining different modules, the communication system with more functions than before is achieved.
Description
Technical field
The utility model belongs to the communications field, is specifically related to a kind of analog/digital modulation /demodulation optical fiber communication simple system.
Background technology
, along with the quickening of the information-based speed of human society, the demand of communication also is the trend of rapid growth; Due to the development of pipeline transmission technology, the light transmission is occupied an leading position in transmission field.The development of making rapid progress because of science and technology and people's changes in demand, communication has now become a requisite part in life.From original Fiberhome telecommunication to the Bell invented phone, then the light transmission theory that proposes to high Kun, after develop glass fibre-optical fiber.From then on, because optical fiber has the not available advantage of some other materials, it has become the only choosing of information transmission medium.Also just for like this, optical fiber communication is compared with other communications, and development rapidly, and becomes the main transmission means of modern communication networks gradually.
The development form of optical fiber communication is swift and violent so fast, is mainly because the optical fiber communication mode is compared with traditional cable communication mode, has advantage clearly.Such as: message capacity is large, and transmission bandwidth is wider, and security performance is fine, invests less saving resource again, instant effect, and also management maintenance is very convenient.But present optical fiber communication is generally all modulated really, demodulation module, can cause like this error rate that produces in message transmitting procedure higher, and this has a certain impact to communication quality.
The utility model content
The utility model, for above-mentioned the deficiencies in the prior art, provides a kind of analog/digital modulation /demodulation optical fiber communication simple system; This analog/digital modulation /demodulation optical fiber communication simple system can effectively reduce the error rate that produces in message transmitting procedure.
The utility model is achieved by the following technical solution:
A kind of analog/digital modulation /demodulation optical fiber communication simple system, comprise modulation module, optical transmission module, Transmission Fibers, Optical Receivers and demodulation module, input signal is connected with optical transmission module after the modulation module modulation treatment, optical transmission module is connected with Optical Receivers by Transmission Fibers, and the signal that Optical Receivers receives is exported after the demodulation module demodulation.
Further, described input signal is analog signal, and described modulation module and demodulation module adopt the AM modulation system.
Further, described input signal is digital signal, and described modulation module and demodulation module adopt PCM, 2FSK or 2DPSK modulation system.
Further, described optical transmission module comprises analog signal input unit, digital signal input unit, analog drive circuit, digital drive circuit and optical transmitter HFBR-1312T; The analog signal input unit is connected with optical transmitter HFBR-1312T by analog drive circuit, and the digital signal input unit is connected with optical transmitter HFBR-1312T by the digital drive circuit.
Further, described Optical Receivers comprises fiber optic receiver HFBR-2316 and mutual conductance type amplifier chip MAX435, and fiber optic receiver HFBR-2316 is connected with mutual conductance type amplifier chip MAX435.
Analog/digital modulation /demodulation optical fiber communication simple system described in the utility model, carry out the analog or digital modulation /demodulation by the signal to input, then with optical fiber communication, be combined, and built the analog/digital optical fiber telecommunications system., due to the processing of analog or digital modulation /demodulation module, can reduce the error rate that produces in message transmitting procedure, and optical fiber communication can provide large capacity, low bit error, the channel that transmission rate is fast; The utility model has just had and has had multi-purpose communication system than originally in conjunction with the system of building by different modules.
Description of drawings
Fig. 1 is the structure chart of analog/digital modulation /demodulation optical fiber communication simple system;
Fig. 2 is the schematic diagram of analog drive circuit;
Fig. 3 is the schematic diagram of digital drive circuit;
Fig. 4 is the schematic diagram of Optical Receivers;
Fig. 5 is the peripheral circuit diagram of chip HFBR-2316;
Fig. 6 is the peripheral circuit diagram of MAX435 peripheral circuit;
Fig. 7 is AM modem communication systematic schematic diagram;
Fig. 8 is 2DPSK modem communication systematic schematic diagram.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the utility model provides a kind of analog/digital modulation /demodulation optical fiber communication simple system, comprise modulation module, optical transmission module, Transmission Fibers, Optical Receivers and demodulation module, input signal is connected with optical transmission module after the modulation module modulation treatment, optical transmission module is connected with Optical Receivers by Transmission Fibers, and the signal that Optical Receivers receives is exported after the demodulation module demodulation.
Analog optical fiber communication is to utilize analog signal to carry out the communication system of transmission information, and the raw electrical signal that information source is sent is baseband signal.But because the sort signal frequency is lower, intensity a little less than, if directly loss is larger in communication system, so we are transformed into baseband signal the signal that its frequency band is adapted at transmitting in channel.When the baseband signal signal is analog signal, can select AM to modulate, and when signal is digital signal, can select PCM, 2FSK or 2DPSK to modulate, arrive receiving terminal through Optical Fiber Transmission again, will adopt corresponding demodulation mode to the signal that receives at signal output part finally.
Optical transmission module described in the utility model comprises analog signal input unit, digital signal input unit, analog drive circuit, digital drive circuit and optical transmitter HFBR-1312T; The analog signal input unit is connected with optical transmitter HFBR-1312T by analog drive circuit, and the digital signal input unit is connected with optical transmitter HFBR-1312T by the digital drive circuit.The light source that adopts is LED, and is to adopt the direct intensity modulation mode.
As shown in Figure 2, what analog drive circuit adopted is transistor cascade amplification driving circuit, if carrying out electric current to the analog signal of input, amplifies this main circuit, form a multiple tube of collection-common-collector amplifier altogether, usually the major parameter of multiple tube comprises: current amplification factor, input resistance, degree of light modulation, average transmit power etc.It is the multiple tube of the BJT formation of same conduction type, and has very high current amplification factor.During the input analog signal, be input to the HFBR-1312T optical transmitter after amplifying circuit amplifies, press lower K switch S101, the LED lamp is bright, by HFBR-1312T, analog electrical signal is converted to light signal.
What the digital drive circuit adopted is differential drive circuit, and the digital signal that is about to input converts electric current to and is injected in the semiconductor light-emitting-diode module.As shown in Figure 3, this module has mainly been utilized the SN75452B chip, and this kind of chip is current driver, can directly be used as the drive circuit of digital light transmitter during use.During supplied with digital signal, 1 end of SN75452B and 2 ends are all high level, and 3 ends are low levels, pull-up K switch S101, and the LED lamp goes out, and with rear drive HFBR-1312T optical transmitter, the signal of telecommunication is converted to light signal.
Optical Receivers mainly comprises fiber optic receiver HFBR-2316 and mutual conductance type amplifier MAX435 chip, and circuit diagram as shown in Figure 4.The HFBR-2316 chip is the optical-electrical converter of high speed, linearity, low-power consumption, converts the faint optical signal after long-distance transmissions to the signal of telecommunication.The electrical signal mouth is SIG, and the concrete circuit design of this chip as shown in Figure 5.Triode connection in circuit is to provide base stage bias current and bias voltage with base stage DC power supply and collector electrode DC power supply Vcc merga pass R106, and C117 and C118 two electric capacity all play coupling in circuit.And power Vcc, resistance R 105, C117 and C118 be common forms a filter filter out power noise.
In Optical Receivers, the photo-signal intensity that photodetector produces is very faint, even through preamplifier, amplify, the electrical signal levels of output generally also still only has the mV magnitude.Therefore, signal also needs to amplify through main amplifier, and its output signal just can reach 1V～3V(peak-to-peak value), then through filter, transfer signals to finally demodulation module, can restore primary signal.So, the gain that main amplifier is mainly used to improve.In the Optical Receivers circuit, the main amplifier function is achieved by the MAX435 integrated chip.
MAX435 mutual conductance type amplifier, be known as again the transconductance type amplifier, and transmission speed is fast, bandwidth.It has the characteristics such as high impedance input, desirable difference, electric current output.Mutual conductance type amplifier is a kind of voltage/current mode hybrid circuit, and its inside does not have the voltage transmission level, only has voltage-current transformation level and current delivery level, therefore do not have long arc voltage signal and Miller multiplier effect.The circuit structure of mutual conductance type amplifier is simple, and supply voltage and power consumption are all less, and it is high that bandwidth, high frequency performance reach well the large-signal conversion speed.
As shown in Figure 6, chip receives the signal of telecommunication by pin 2 and enters into broadband mutual conductance type amplifier MAX435 chip the peripheral circuit of MAX435 amplification chip, finally by 13 pin output original signals.In circuit, RP103 is the major parameter setting that can control, regulates this variable resistor and can change the gain of signal between input and output, and in theory, when the RP103 resistance is little, multiplication factor is larger.And RP104, it generally can be adjusted to the end of potentiometer, makes the signal of TP104 port output maximum as far as possible, but it is not very large on the transmission impact of integrated circuit signal.
Below the example that is embodied as with simulation, digital signal Optical Fiber Transmission describes.AM modem communication systematic schematic diagram as shown in Figure 7.First analog signal is input to the AM modulation module, then the circuit between light transmitting terminal and optical receiving end in optical fiber telecommunications system is connected, modulation signal is input to the AM demodulation module, just can form so in theory a small-sized analog optical fiber communication system.After connecting, with the waveform of each test point in digital oscilloscope test simulation signal and transmission line.
Fig. 8 is 2DPSK modem communication systematic schematic diagram.First digital signal is input to the 2DPSK modulation module, again the light path between light transmitting terminal and optical receiving end in optical fiber telecommunications system is connected, modulation signal is input to the 2DPSK demodulation module, just can forms so in theory a small-sized Digital Optical Fibre Communication System.After connection, with the waveform of each test point in digital oscilloscope test of digital signal and transmission line.
The utility model not only is confined to above-mentioned embodiment; persons skilled in the art content disclosed according to the utility model; can adopt other multiple embodiment to implement the utility model; therefore; every employing project organization of the present utility model and thinking; do some simple designs that change or change, all fall into the scope of the utility model protection.
Claims (5)
1. analog/digital modulation /demodulation optical fiber communication simple system, it is characterized in that, comprise modulation module, optical transmission module, Transmission Fibers, Optical Receivers and demodulation module, input signal is connected with optical transmission module after the modulation module modulation treatment, optical transmission module is connected with Optical Receivers by Transmission Fibers, and the signal that Optical Receivers receives is exported after the demodulation module demodulation.
2. analog/digital modulation /demodulation optical fiber communication simple system according to claim 1, is characterized in that, described input signal is analog signal, and described modulation module and demodulation module adopt the AM modulation system.
3. analog/digital modulation /demodulation optical fiber communication simple system according to claim 1, is characterized in that, described input signal is digital signal, and described modulation module and demodulation module adopt PCM, 2FSK or 2DPSK modulation system.
4. analog/digital modulation /demodulation optical fiber communication simple system according to claim 1, it is characterized in that, described optical transmission module comprises analog signal input unit, digital signal input unit, analog drive circuit, digital drive circuit and optical transmitter HFBR-1312T; The analog signal input unit is connected with optical transmitter HFBR-1312T by analog drive circuit, and the digital signal input unit is connected with optical transmitter HFBR-1312T by the digital drive circuit.
5. analog/digital modulation /demodulation optical fiber communication simple system according to claim 1, it is characterized in that, described Optical Receivers comprises fiber optic receiver HFBR-2316 and mutual conductance type amplifier chip MAX435, and fiber optic receiver HFBR-2316 is connected with mutual conductance type amplifier chip MAX435.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107735968A (en) * | 2015-09-30 | 2018-02-23 | 华为技术有限公司 | The apparatus and method of transmission signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107735968A (en) * | 2015-09-30 | 2018-02-23 | 华为技术有限公司 | The apparatus and method of transmission signal |
| CN107735968B (en) * | 2015-09-30 | 2019-11-29 | 华为技术有限公司 | The device and method for transmitting signal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131113 Termination date: 20140606 |