CN102244546B - Communication system capable of eliminating non-linear influence of optical fiber in analogue optical communication - Google Patents
Communication system capable of eliminating non-linear influence of optical fiber in analogue optical communication Download PDFInfo
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- CN102244546B CN102244546B CN201010585181.0A CN201010585181A CN102244546B CN 102244546 B CN102244546 B CN 102244546B CN 201010585181 A CN201010585181 A CN 201010585181A CN 102244546 B CN102244546 B CN 102244546B
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Abstract
The invention relates to a communication system capable of eliminating non-linear influence of an optical fiber in an analogue optical communication. The system comprises a coupler circuit, a gain module circuit, a transmitting module circuit and an optical receiving module circuit, wherein the coupler circuit is orderly connected with the gain module circuit, the transmitting module circuit and the optical receiving module circuit. The system provided by the invention has the following benefits that: By adding an out of band signal source, a laser of an optical transmitting module works in an appropriate modulated state, so that the non-linear effect, which is generated in optical fiber transmission, on signal quality is eliminated. Moreover, the application is suitable for a wide frequency range and can be simply implemented.
Description
Technical field
The present invention relates to a kind of simulated light communications field, particularly a kind of communication system of eliminating non-linear influence of optical fiber in analogue optical communication.
Background technology
In optical communication field, the nonlinear effect that light produces in Optical Fiber Transmission process can worsen signal transmission quality, thereby can cause whole communication system normally to work.Therefore, the nonlinear technology for eliminating measure of light becomes a vital link while setting up optical communication system.
Summary of the invention
Light nonlinear effect has a lot, and the impact that signal is caused is also varied.Occasion and requirement in view of system use, the present invention proposes a kind of band outside coupled signal suppress the scheme of fiber nonlinear effect (being mainly Brillouin scattering effect), can eliminate the communication system of non-linear influence of optical fiber in analogue optical communication, to eliminate the impact of nonlinear effect on communication quality.
The present invention for achieving the above object, the scheme of taking is: a kind of communication system of eliminating non-linear influence of optical fiber in analogue optical communication, it is characterized in that: comprise coupler circuit, gain module circuit, transmitter module circuit, Optical Receivers circuit, described coupler circuit is connected with gain module circuit, transmitter module circuit, Optical Receivers circuit successively, resistance R 7 in described coupler circuit, resistance R 8, resistance R 9 are by microstrip line parallel connection, by capacitor C 4,1 mouthful with interface X1 is connected 1 pin of radio frequency amplifier D1 in described gain module circuit, 2 mouthfuls of ground connection of interface X1, 2 pin of radio frequency amplifier D1, 4 pin ground connection, 3 pin and inductance L 1, one end of capacitor C 3 connects, the other end of inductance L 1 connects one end of the positive 12V of power supply and capacitor C 2 by resistance R 1, the other end ground connection of capacitor C 2, the other end of capacitor C 3 is leaded up to resistance R 4 ground connection, separately lead up to resistance R 3 connecting resistance R5, one end of capacitor C 5, the other end ground connection of resistance R 5, 1 pin of another termination radio frequency amplifier D2 of capacitor C 5, 2 pin of radio frequency amplifier D2, 4 pin ground connection, 3 pin connect inductance L 2, one end of capacitor C 6, the other end of inductance L 2 connects one end of the positive 12V of power supply and capacitor C 1 by resistance R 2, the other end ground connection of capacitor C 1, 1 mouthful of the other end of capacitor C 6 and interface X2 is connected, 2 mouthfuls of ground connection of interface X2, capacitor C 8, capacitor C 7 parallel connections, the positive pole of capacitor C 7 connects the positive 12V of power supply and interface X3 5 mouthfuls, and the minus earth of capacitor C 7 is also connected with 8 mouthfuls of interface X3, 1 pin of operational amplifier U3 in described Optical Receivers circuit is leaded up to resistance R 2, 1 mouthful of resistance R 6 and interface X2 joins, 2 mouthfuls of ground connection of interface X2, one end in parallel with capacitor C 9 and resistance R 1, another road joins, capacitor C 9 and the other end of resistance R 1 parallel connection and 4 pin of operational amplifier U3 are connected and connect 2 pin of photodiode U4, 1 pin of photodiode U4 meets power-5V, 3 pin ground connection, 2 pin of operational amplifier U3 connect capacitor C 14, one end of capacitor C 15 and power-5V, capacitor C 14, the other end of capacitor C 15 joins and ground connection, the 3 pin connecting resistance R3 of operational amplifier U3, one end of capacitor C 13, resistance R 3, the other end ground connection of capacitor C 13, 5 pin of operational amplifier U3 connect capacitor C 11, the positive 5V of one end of capacitor C 1O and power supply, capacitor C 11, the other end ground connection of capacitor C 10, 3 pin of operational amplifier U5 connect 1 pin of operational amplifier U3,2 pin are leaded up to resistance R 4 and are connect 6 pin of operational amplifier U5 and 1 mouthful of interface X1, another road connects 1 pin, 4 pin, 8 pin of operational amplifier U5 and passes through resistance R 5 ground connection, 5 pin of operational amplifier U5 meet power-5V, and 7 pin meet the positive 5V of power supply, 1 pin of voltage stabilizing chip U1 connects one end of capacitor C 2 and the positive pole of capacitor C 1 and meets the positive 12V of power supply, 3 pin of voltage stabilizing chip UI connect one end of capacitor C 3 and the positive pole of capacitor C 4 and meet the positive 5V of power supply, the other end of the negative pole of capacitor C 1 and capacitor C 4 and capacitor C 2, capacitor C 3 join and connect voltage stabilizing chip UI 2 pin and ground, the positive 5V of one termination power of capacitor C 16, other end ground connection, 2 pin of voltage stabilizing chip U2 connect one end of capacitor C 6 and the negative pole of capacitor C 5 and meet power-12V, 3 pin of voltage stabilizing chip U2 connect one end of capacitor C 7 and the negative pole of capacitor C 8 and meet power-5V, the other end of the positive pole of the positive pole of capacitor C 5 and capacitor C 8 and capacitor C 6, capacitor C 7 join and connect voltage stabilizing chip U2 1 pin and ground, one termination power-5V of capacitor C 17, other end ground connection.
The invention has the beneficial effects as follows: by additional out of band signal source, make the laser works of light emission module under a suitable modulated state, thereby the nonlinear effect producing in Optical Fiber Transmission is eliminated the impact of signal quality.And it is wide that this applies applicable frequency range, realize simple.
Accompanying drawing explanation
Fig. 1 is that circuit of the present invention connects block diagram.
Fig. 2 is coupler circuit schematic diagram of the present invention.
Fig. 3 is gain module circuit theory diagrams of the present invention.
Fig. 4 is Optical Receivers circuit theory diagrams of the present invention.
Fig. 5 is light emission module circuit theory diagrams of the present invention.
Fig. 6 is gained test background noise spectrogram during without out of band signal source.
Fig. 7 is gained test background noise spectrogram when having out of band signal source.
Fig. 8 is the present invention's test spectrogram of normally working.
Embodiment
As shown in Figure 1, can eliminate the communication system of non-linear influence of optical fiber in analogue optical communication, the extraneous certain power signal of required frequency transmission signal and required signal transmission that in this system, out of band signal source produces are coupled by signal coupler, then transferring to gain module circuit amplifies signal, and change by light generation module electric light, through long-distance optical cable transmission to Optical Receivers, carry out electric light conversion, be finally transferred to rear end equipment.
As shown in Figure 2, the resistance R in coupler circuit 7, resistance R 8, resistance R 9 are by microstrip line parallel connection.Useful signal and out of band signal respectively two input INPUT1 by coupler and INPUT2 are input in the middle of coupler, two paths of signals transfers to output OUTPUT through the microstrip line of special shape, finally realizing output exports two paths of signals simultaneously and does not cause crosstalking between signal, resistance R 7, R8, the function of R9 is exactly to be isolated in the two paths of signals transmitting in module.
As shown in Figure 3, by capacitor C 4,1 mouthful with interface X1 is connected 1 pin of radio frequency amplifier D1 in gain module circuit, 2 mouthfuls of ground connection of interface X1, 2 pin of radio frequency amplifier D1, 4 pin ground connection, 3 pin and inductance L 1, one end of capacitor C 3 connects, the other end of inductance L 1 connects one end of the positive 12V of power supply and capacitor C 2 by resistance R 1, the other end ground connection of capacitor C 2, the other end of capacitor C 3 is leaded up to resistance R 4 ground connection, separately lead up to resistance R 3 connecting resistance R5, one end of capacitor C 5, the other end ground connection of resistance R 5, 1 pin of another termination radio frequency amplifier D2 of capacitor C 5, 2 pin of radio frequency amplifier D2, 4 pin ground connection, 3 pin connect inductance L 2, one end of capacitor C 6, the other end of inductance L 2 connects one end of the positive 12V of power supply and capacitor C 1 by resistance R 2, the other end ground connection of capacitor C 1, 1 mouthful of the other end of capacitor C 6 and interface X2 is connected, 2 mouthfuls of ground connection of interface X2, capacitor C 8, capacitor C 7 parallel connections, the positive pole of capacitor C 7 connects the positive 12V of power supply and interface X3 5 mouthfuls, and the minus earth of capacitor C 7 is also connected with 8 mouthfuls of interface X3.In gain module, adopt two-stage radio-frequency amplifier, centre adds the design form of 3dB attenuation network.Amplifier adopts the ERA-51sm amplifier of mini-circuit company.
By the signal of the output OUTPUT output of coupler, inputed to the input X1 of gain module, after after radio frequency amplifier D1 amplifies again by by R3, R4, the 3dB attenuation network that R5 forms will amplify through radio frequency amplifier D2 after signal attenuation 3dB again, and the signal after final amplification is exported by X2.C3, C4, C5, C6 is capacitance, function is that the DC component in anti-stop signal enters system.
1 pin of operational amplifier U3 in Optical Receivers circuit is leaded up to resistance R 2 as shown in Figure 4, 1 mouthful of resistance R 6 and interface X2 joins, 2 mouthfuls of ground connection of interface X2, one end in parallel with capacitor C 9 and resistance R 1, another road joins, capacitor C 9 and the other end of resistance R 1 parallel connection and 4 pin of operational amplifier U3 are connected and connect 2 pin of photodiode U4, 1 pin of photodiode U4 meets power-5V, 3 pin ground connection, 2 pin of operational amplifier U3 connect capacitor C 14, one end of capacitor C 15 and power-5V, capacitor C 14, the other end of capacitor C 15 joins and ground connection, the 3 pin connecting resistance R3 of operational amplifier U3, one end of capacitor C 13, resistance R 3, the other end ground connection of capacitor C 13, 5 pin of operational amplifier U3 connect capacitor C 11, the positive 5V of one end of capacitor C 1O and power supply, capacitor C 11, the other end ground connection of capacitor C 10, 3 pin of operational amplifier U5 connect 1 pin of operational amplifier U3,2 pin are leaded up to resistance R 4 and are connect 6 pin of operational amplifier U5 and 1 mouthful of interface X1, another road connects 1 pin, 4 pin, 8 pin of operational amplifier U5 and passes through resistance R 5 ground connection, 5 pin of operational amplifier U5 meet power-5V, and 7 pin meet the positive 5V of power supply, 1 pin of voltage stabilizing chip U1 connects one end of capacitor C 2 and the positive pole of capacitor C 1 and meets the positive 12V of power supply, 3 pin of voltage stabilizing chip UI connect one end of capacitor C 3 and the positive pole of capacitor C 4 and meet the positive 5V of power supply, the other end of the negative pole of capacitor C 1 and capacitor C 4 and capacitor C 2, capacitor C 3 join and connect voltage stabilizing chip UI 2 pin and ground, the positive 5V of one termination power of capacitor C 16, other end ground connection, 2 pin of voltage stabilizing chip U2 connect one end of capacitor C 6 and the negative pole of capacitor C 5 and meet power-12V, 3 pin of voltage stabilizing chip U2 connect one end of capacitor C 7 and the negative pole of capacitor C 8 and meet power-5V, the other end of the positive pole of the positive pole of capacitor C 5 and capacitor C 8 and capacitor C 6, capacitor C 7 join and connect voltage stabilizing chip U2 1 pin and ground, one termination power-5V of capacitor C 17, other end ground connection.Optical Receivers is to utilize the trans-impedance amplifier that operational amplifier is built to design, OPA657 and the OPA129 of the ShiTI company that operational amplifier adopts.OPA657 realizes across resistance enlarging function, and OPA129 realizes power-voltage transitions, exports main control unit to.
The optical carrier of being launched by light emission module is input to photodiode by optical cable, thereby make photodiode produce photoelectric current, the trans-impedance amplifier that photo-signal consists of operational amplifier U3 and resistor-capacitor unit is realized current/voltage conversion, and signal is further amplified, after the OUT end process impedance matching (R2, R6) of signal after conversion by U3, export rear end equipment to.A voltage signal part for the OUT end output of U3 is input to the IN+ end of operational amplifier U5, and operational amplifier U5 forms voltage follower with corresponding resistance, is characterized in that input impedance is very large.The voltage of the output OUT output of U3 inputs to main control unit and realizes Optical Receivers operating state implementation monitoring.
As shown in Figure 5, light transmitting adopts the 1612P laser emitting module of ORTEL company.
The RF INPUT that the signal of being exported by gain module inputs to light emission module laser holds, thereby has laser to export by make the signal of telecommunication be loaded into light signal to the modulation of laser bias current.And automatic power control circuitry in figure is realized and is made laser photophore luminous power stable to the control of the bias current of laser.Automatic temp. controlling circuit is realized laser tube core temperature is controlled, thereby makes laser works at normal temperature and be unlikely to cause damage, and two required benchmark of control circuit are produced by reference voltage circuit.
Main control unit design, main control unit core is the C8051F020 single-chip microcomputer that adopts Cygnal company, realizes the collection and monitor to each functional module quantity of state.
Out of band signal source adopts the E4438C of Agilent company vector signal source to simulate.
As shown in Figure 6, the spectrogram of measured code book back noise during without additional out of band signal source, as seen from the figure, and when not adding out of band signal, due to the impact of nonlinear fiber, the reached-70dBm of background noise intensity of signal.
Gained test background noise spectrogram while as shown in Figure 7, having additional out of band signal source.As seen from the figure, in the situation that having added out of band signal, the local dropped to-100dBm of noise of signal, obviously than the little 30dB of noise in Fig. 6.
When as shown in Figure 8, system is normally worked, test spectrogram.Owing to having eliminated the impact of the nonlinear effect of optical fiber, realize the function of the small and weak signal of transmission.Large-signal in figure is exactly the out of band signal of price, and small-signal is with interior useful signal exactly, because system has certain gain, thereby has realized the nonlinear impact of elimination light, the object that small-signal can undistorted transmission.
Claims (1)
1. the communication system that can eliminate non-linear influence of optical fiber in analogue optical communication, it is characterized in that: comprise coupler circuit, gain module circuit, transmitter module circuit, Optical Receivers circuit, described coupler circuit is connected with gain module circuit, transmitter module circuit, Optical Receivers circuit successively, resistance R 7 in described coupler circuit, resistance R 8, resistance R 9 are by microstrip line parallel connection, by capacitor C 4,1 mouthful with interface X1 is connected 1 pin of radio frequency amplifier D1 in described gain module circuit, 2 mouthfuls of ground connection of interface X1, 2 pin of radio frequency amplifier D1, 4 pin ground connection, 3 pin and inductance L 1, one end of capacitor C 3 connects, the other end of inductance L 1 connects one end of the positive 12V of power supply and capacitor C 2 by resistance R 1, the other end ground connection of capacitor C 2, the other end of capacitor C 3 is leaded up to resistance R 4 ground connection, separately lead up to resistance R 3 connecting resistance R5, one end of capacitor C 5, the other end ground connection of resistance R 5, 1 pin of another termination radio frequency amplifier D2 of capacitor C 5, 2 pin of radio frequency amplifier D2, 4 pin ground connection, 3 pin connect inductance L 2, one end of capacitor C 6, the other end of inductance L 2 connects one end of the positive 12V of power supply and capacitor C 1 by resistance R 2, the other end ground connection of capacitor C 1, 1 mouthful of the other end of capacitor C 6 and interface X2 is connected, 2 mouthfuls of ground connection of interface X2, capacitor C 8, capacitor C 7 parallel connections, the positive pole of capacitor C 7 connects the positive 12V of power supply and interface X3 5 mouthfuls, and the minus earth of capacitor C 7 is also connected with 8 mouthfuls of interface X3, 1 pin of operational amplifier U3 in described Optical Receivers circuit is leaded up to resistance R 2, 1 mouthful of resistance R 6 and interface X2 joins, 2 mouthfuls of ground connection of interface X2, one end in parallel with capacitor C 9 and resistance R 1, another road joins, capacitor C 9 and the other end of resistance R 1 parallel connection and 4 pin of operational amplifier U3 are connected and connect 2 pin of photodiode U4, 1 pin of photodiode U4 meets power-5V, 3 pin ground connection, 2 pin of operational amplifier U3 connect capacitor C 14, one end of capacitor C 15 and power-5V, capacitor C 14, the other end of capacitor C 15 joins and ground connection, the 3 pin connecting resistance R3 of operational amplifier U3, one end of capacitor C 13, resistance R 3, the other end ground connection of capacitor C 13, 5 pin of operational amplifier U3 connect capacitor C 11, the positive 5V of one end of capacitor C 1O and power supply, capacitor C 11, the other end ground connection of capacitor C 10, 3 pin of operational amplifier U5 connect 1 pin of operational amplifier U3,2 pin are leaded up to resistance R 4 and are connect 6 pin of operational amplifier U5 and 1 mouthful of interface X1, another road connects 1 pin, 4 pin, 8 pin of operational amplifier U5 and passes through resistance R 5 ground connection, 5 pin of operational amplifier U5 meet power-5V, and 7 pin meet the positive 5V of power supply, 1 pin of voltage stabilizing chip U1 connects one end of capacitor C 2 and the positive pole of capacitor C 1 and meets the positive 12V of power supply, 3 pin of voltage stabilizing chip UI connect one end of capacitor C 3 and the positive pole of capacitor C 4 and meet the positive 5V of power supply, the other end of the negative pole of capacitor C 1 and capacitor C 4 and capacitor C 2, capacitor C 3 join and connect voltage stabilizing chip UI 2 pin and ground, the positive 5V of one termination power of capacitor C 16, other end ground connection, 2 pin of voltage stabilizing chip U2 connect one end of capacitor C 6 and the negative pole of capacitor C 5 and meet power-12V, 3 pin of voltage stabilizing chip U2 connect one end of capacitor C 7 and the negative pole of capacitor C 8 and meet power-5V, the other end of the positive pole of the positive pole of capacitor C 5 and capacitor C 8 and capacitor C 6, capacitor C 7 join and connect voltage stabilizing chip U2 1 pin and ground, one termination power-5V of capacitor C 17, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010585181.0A CN102244546B (en) | 2010-12-13 | 2010-12-13 | Communication system capable of eliminating non-linear influence of optical fiber in analogue optical communication |
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| CN201010585181.0A CN102244546B (en) | 2010-12-13 | 2010-12-13 | Communication system capable of eliminating non-linear influence of optical fiber in analogue optical communication |
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| CN102244546B true CN102244546B (en) | 2014-04-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102496844B (en) * | 2011-12-07 | 2013-07-17 | 天津大学 | Complementary metal oxide semiconductor (CMOS) laser driving circuit for fourth generation (4G) radio-over-fiber |
| CN110617946B (en) * | 2018-06-19 | 2021-12-28 | 通号工程局集团电气工程有限公司 | Quick detection device for optical cable connection quality |
| CN115267340B (en) * | 2022-07-29 | 2023-06-16 | 北京津发科技股份有限公司 | Detection circuit and device based on equipotential shielding |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1317083A2 (en) * | 2001-11-29 | 2003-06-04 | Fujitsu Limited | Optical transmission system and optical transmission method utilizing Raman amplification |
| CN1859044A (en) * | 2006-03-30 | 2006-11-08 | 上海交通大学 | Poly code type light adjustable transmitter |
| CN101795159A (en) * | 2010-03-26 | 2010-08-04 | 武汉邮电科学研究院 | High-speed WDM (Wavelength Division Multiplexing) light communication system and method for resisting non-linearity effect in same |
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- 2010-12-13 CN CN201010585181.0A patent/CN102244546B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1317083A2 (en) * | 2001-11-29 | 2003-06-04 | Fujitsu Limited | Optical transmission system and optical transmission method utilizing Raman amplification |
| CN1859044A (en) * | 2006-03-30 | 2006-11-08 | 上海交通大学 | Poly code type light adjustable transmitter |
| CN101795159A (en) * | 2010-03-26 | 2010-08-04 | 武汉邮电科学研究院 | High-speed WDM (Wavelength Division Multiplexing) light communication system and method for resisting non-linearity effect in same |
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Granted publication date: 20140409 Termination date: 20161213 |