CN102710338A - Method for realizing automatic gain compensation of simulative optic-fiber repeater according to light detection - Google Patents
Method for realizing automatic gain compensation of simulative optic-fiber repeater according to light detection Download PDFInfo
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- CN102710338A CN102710338A CN2012101783692A CN201210178369A CN102710338A CN 102710338 A CN102710338 A CN 102710338A CN 2012101783692 A CN2012101783692 A CN 2012101783692A CN 201210178369 A CN201210178369 A CN 201210178369A CN 102710338 A CN102710338 A CN 102710338A
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Abstract
The invention discloses a method for realizing automatic gain compensation of a simulative optic-fiber repeater according to light detection. The method comprises the following steps: when a far-end machine starts up, attenuation values of an uplink radio frequency attenuator and a downlink radio frequency attenuator are set to maximum values; a PD (Potential Difference) detection voltage is sampled by a single-chip microcomputer; the current voltage value is stored, and the decrement can be obtained by searching a light receiving power and detection voltage corresponding table; the decrement of the radio frequency attenuator can be controlled by the decrement obtained by searching the table through the single-chip microcomputer; the PD detection voltage is sampled at a fixed time by the single-chip microcomputer; the PD detection voltage and the stored voltage are compared, when a difference of the sampled voltage value and the voltage value stored by a register is greater than 20 mV, the new data is stored and the table is searched again. According to the invention, the problems of large debugging difficulty and high maintenance cost of a regular optic-fiber repeated on engineering installation are solved, and the difficulty and the work hour of the engineering installation can be reduced.
Description
[technical field]
The present invention relates to optical fiber repeater, specifically be meant the method for a kind of analog optical fiber repeater according to the Gain Automatic compensation of light detection realization.
[background technology]
At moving communicating field, the repeater can enlarge the coverage that modeling fits the digital mobile communication base station, is the most economical effective means that solve blind area, outlying district mobile communication.Optical fiber repeater does not receive the influence of geographical environment, Changes in weather or the adjustment of donor base station coverage through optical fiber transmission signal, so working stability, and coverage effect is good, in the modern communication field, receives widely and using.
Traditional optical fiber repeater mainly contains light near-end machine, optical fiber, light remote termination (capping unit) several sections composition.Light near-end machine and light remote termination all comprise radio frequency unit (RF unit) and light unit.After wireless signal is coupled out, get into light near-end machine from the base station, change through electric light; The signal of telecommunication changes light signal into, inputs to optical fiber from light near-end machine, arrives the light remote termination through Optical Fiber Transmission; The light remote termination transfers light signal to the signal of telecommunication; Get into the RF unit and amplify, signal is sent into transmitting antenna after amplifying, the coverage goal zone.The operation principle of up link is the same, and the signal of mobile phone emission arrives the near-end machine again through reception antenna to light remote termination, gets back to the base station.The efficient of the gain of the gain of uplink downlink and near-end machine, electric light conversion, the differential loss of Optical Fiber Transmission, remote termination gain etc. are relevant, and wherein the differential loss of Optical Fiber Transmission constantly changes in the installation of equipment, meeting in service, has bigger uncertainty.
This tradition repeater when mounted, the gain of link receives the size of optical fiber differential loss and changes, in when design; All be to design by the link maximum gain; When equipment is installed, adjust link gain through radio frequency attenuator according to the optical fiber differential loss on the link and the size of actual required coverage; This method debugging is installed complicated, but also has than mistake; In engineering application, a near-end machine can drag several remote terminations, and it is big that the link gain differential loss becomes, and gain allocation is more complicated; Equipment is in actual motion; The reason such as aging of the differential loss of optical fiber and equipment all can cause the instability of link gain; Thereby cause the far-end power amplifier to output to the power instability of antenna, this just requires irregular inspection of engineering maintenance personnel and adjustment, and the manual maintenance cost is bigger.
[summary of the invention]
Technical problem to be solved by this invention is; Overcome the shortcoming and defect of prior art; Provide a kind of analog optical fiber repeater to detect the method that realizes Gain Automatic compensation according to light; It is big to have solved the debugging difficulty that the conventional fiber repeater exists on project installation, the difficult problem that maintenance cost is high, the difficulty and the man-hour of having reduced project installation.
The present invention adopts following technical scheme to solve the problems of the technologies described above:
The method that realizes Gain Automatic compensation is detected according to light in a kind of analog optical fiber repeater, it is characterized in that: comprise the steps:
Step 1: during the remote termination start, be arranged to maximum to the pad value of up-downgoing radio frequency attenuator;
Step 2: single-chip microcomputer detects voltage to PD and samples;
Step 3: preserve current magnitude of voltage, look into light receipts power and draw attenuation with detection voltage correspondence table;
Step 4: the pad value of the attenuation of the gained of tabling look-up through the Single-chip Controlling radio frequency attenuator;
Step 5: single-chip microcomputer regularly detects voltage to PD and samples;
Step 6: compare with the magnitude of voltage that step 3 is preserved, whether difference more than or equal to 20mV be, changes step 3 over to, not, changes step 7 over to;
Step 7: the pad value that keeps current up-downgoing radio frequency attenuator.
Further, PD detection magnitude of voltage is a repeated detection in the said step 2, gets its mean value.
The invention has the advantages that: automatic gain control is used flexibly by Single-chip Controlling among the present invention, can open or close automatic gain adjustment function according to actual needs; Near and remote machine is together partly integrated radio frequency part, optical module part, software supervision, the advantage that integrated level is high, production is easy for installation, cost is low; This automatic gain adjustment function is on the basis of original system, increases software processes, need not to increase the cost of a lot of hardware, compares other implementations, and it is low to have a cost, and little characteristics are changed in design.Debugging has simply reduced the cost of project installation on project installation, and maintenance cost is low.
[description of drawings]
Combine embodiment that the present invention is done further description with reference to the accompanying drawings.
Fig. 1 is an analog optical fiber of the present invention repeater structural representation.
Fig. 2 is the flow chart of the present invention with software design ride gain automatic compensation function.
[embodiment]
As shown in Figure 1, be analog optical fiber of the present invention repeater structural representation.The downstream signal that donor antenna 1 is coupled to from the base station carries out filtering through dielectric duplexer 2; Through a radio frequency attenuator 3; The size of the downstream signal that its rf attenuation value can be coupled to according to near-end by the engineering staff is debugged; Through behind the one-level small signal amplifier 4, the laser 5 that is input to optical assembly carries out the electric light conversion again.Because of the size of near-end machine light modulated power has influence on the far-end gain compensation, thus light modulated power be consistent as far as possible, to reduce error; Light modulated power of the present invention is got 4dBm, and the light of reception and emission is transferred to remote termination through optical fiber 10 after merging through light wavelength division multiplexing 9; After the light signal that remote termination receives was opened through light wavelength division multiplexing in 11 minutes, the photodetector 12 through optical assembly converted light signal to the signal of telecommunication; After 13 amplifications of one-level small signal amplifier, be input to radio frequency attenuator 14, the pad value of this attenuator is by Single-chip Controlling; Can be set to manually be provided with gain mode and automatic gain compensation pattern, carry out the amplification of signal through high power amplifier 15 again, pass through high-power cavity duplexer 16 filtering at last after; Be input to retransmitting antenna 17, realize the signal of blind area is covered.The mobile phone signal that retransmitting antenna 17 receives behind high-power cavity duplexer 16, is input to low noise amplifier 18; Again through radio frequency attenuator 19 adjustment that gains; The attenuation of attenuator and descending radio frequency attenuator 14 values are the same, and the laser 21 that is input to optical assembly after amplifying through small signal amplifier 20 carries out the electric light conversion, after using through light wavelength division multiplexing 11 and descending optical multiplexed signal; Be transferred to the near-end machine through optical fiber 10; The light signal that the near-end machine receives separates through light wavelength division multiplexing 9, accomplishes the conversion of photoelectricity through photodetector 8, after up radio frequency attenuator 7, small signal amplifier 6 amplify; Get into dielectric duplexer 2, send to the base station through donor antenna 1 at last.
The radio frequency attenuator of near-end machine uplink downlink can be adjusted by the engineering staff according to the signal strength signal intensity that is coupled to from the base station, increases equipment installation flexibility and versatility.
Shown in Figure 2 for having the software control flow chart at Gain Automatic compensate function analog optical fiber station.When far-end has just been started shooting; In order to protect radio frequency link; Be arranged to maximum to the radio frequency attenuator pad value of up-downgoing, single-chip microcomputer detects voltage to PD and samples, for improving accuracy; Can sample and repeatedly average, single-chip microcomputer current detection to magnitude of voltage a be saved in the register and according to table 1 (light is received power and detected the voltage correspondence table) can draw current luminous power b size that receives and up-downgoing radio frequency attenuator the attenuation c that should be provided with.
Table 1
| Detect magnitude of voltage a (mV) | Light is received performance number b (dBm) | Attenuation c (dB) |
| ?a≥2800 | b≥4.0 | ?c=15 |
| ?2640≤a＜2800 | 3.5≤b＜4.0 | ?c=14 |
| ?2400≤a＜2640 | 3.0≤b＜3.5 | ?c=13 |
| ?2200≤a＜2400 | 2.5≤b＜3.0 | ?c=12 |
| ?2000≤a＜2200 | 2.0≤b＜2.5 | ?c=11 |
| ?1850≤a＜2000 | 1.5≤b＜2.0 | ?c=10 |
| ?1650≤a＜1850 | 1.0≤b＜1.5 | ?c=9 |
| ?1500≤a＜1650 | 0.5≤b＜1.0 | ?c=8 |
| ?1320≤a＜1500 | 0≤b＜0.5 | ?c=7 |
| ?1180≤a＜1320 | -0.5≤b＜0 | ?c=6 |
| ?1060≤a＜1180 | -1.0≤b＜-0.5 | ?c=5 |
| ?950≤a＜1060 | -1.5≤b＜-1.0 | ?c=4 |
| ?850≤a＜950 | -2.0≤b＜-1.5 | ?c=3 |
| ?760≤a＜850 | -2.5≤b＜-2.0 | ?c=2 |
| ?680≤a＜760 | -3.0≤b＜-2.5 | ?c=1 |
| ?a＜680 | b＜-3.0 | ?c=0 |
Control the radio frequency attenuator pad values to the attenuation of the gained of tabling look-up through single-chip microcomputer 23; Because of the environment of outside all can change at any time, single-chip microcomputer 23 needs the photo-detection voltage of PD is detected in real time, and compares with the voltage of register holds; Because of there is error in the AD of single-chip microcomputer 23 sampling; For avoiding between adjacent two pad values frequently switching, when the magnitude of voltage difference of the magnitude of voltage of sampling and register holds surpasses 20mV, just carry out the preservation of new data and table look-up again.
The table 1 that this instance is given is the selected mean value of test many groups PD detector, and the detection voltage in the form is relevant with the model of light PD detector, the detection resistance value of PD end, the multiplication factor of amplifier etc.
Realized automatic gain control among the present invention by Single-chip Controlling, automatic gain adjustment function opened or closed to use can flexibly according to actual needs; Near and remote machine is together partly integrated radio frequency part, optical module part, software supervision, the advantage that integrated level is high, production is easy for installation, cost is low; This automatic gain adjustment function is on the basis of original system, increases software processes, need not to increase the cost of a lot of hardware, compares other implementations, and it is low to have a cost, and little characteristics are changed in design.Debugging has simply reduced the cost of project installation on project installation, and maintenance cost is low.
Though more than described embodiment of the present invention; But the technical staff who is familiar with the present technique field is to be understood that; We described concrete embodiment is illustrative; Rather than being used for qualification to scope of the present invention, those of ordinary skill in the art are in the modification and the variation of the equivalence of doing according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (2)
1. the method that realizes Gain Automatic compensation is detected according to light in an analog optical fiber repeater, it is characterized in that: comprise the steps:
Step 1: during the remote termination start, be arranged to maximum to the pad value of up-downgoing radio frequency attenuator;
Step 2: single-chip microcomputer detects voltage to PD and samples;
Step 3: preserve current magnitude of voltage, look into light receipts power and draw attenuation with detection voltage correspondence table;
Step 4: the pad value of the attenuation of the gained of tabling look-up through the Single-chip Controlling radio frequency attenuator;
Step 5: single-chip microcomputer regularly detects voltage to PD and samples;
Step 6: compare with the magnitude of voltage that step 3 is preserved, whether difference more than or equal to 20mV be, changes step 3 over to, not, changes step 7 over to;
Step 7: the pad value that keeps current up-downgoing radio frequency attenuator.
2. the method that realizes Gain Automatic compensation is detected according to light in a kind of analog optical fiber as claimed in claim 1 repeater, it is characterized in that: PD detection magnitude of voltage is a repeated detection in the said step 2, gets its mean value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101783692A CN102710338A (en) | 2012-05-31 | 2012-05-31 | Method for realizing automatic gain compensation of simulative optic-fiber repeater according to light detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104443A (en) * | 2014-08-04 | 2014-10-15 | 山东科汇电力自动化股份有限公司 | Method and device for transmitting analog electrical signal through optical fiber |
| CN107769798A (en) * | 2017-10-18 | 2018-03-06 | 青岛海信宽带多媒体技术有限公司 | A kind of method and device for controlling radio frequency output signal power invariability |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101119150A (en) * | 2007-09-21 | 2008-02-06 | 深圳市虹远通信有限责任公司 | Method for implementing intelligent automatic level control and intelligent gain control |
| CN201188612Y (en) * | 2008-03-19 | 2009-01-28 | 南京东大宽带通信技术有限公司 | Closed-loop automatic level control device for TDD mode communication system |
| CN102215070A (en) * | 2011-06-16 | 2011-10-12 | 武汉虹信通信技术有限责任公司 | Intelligent passband ripple calibration method for digital fiber optic repeater |
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- 2012-05-31 CN CN2012101783692A patent/CN102710338A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119150A (en) * | 2007-09-21 | 2008-02-06 | 深圳市虹远通信有限责任公司 | Method for implementing intelligent automatic level control and intelligent gain control |
| CN201188612Y (en) * | 2008-03-19 | 2009-01-28 | 南京东大宽带通信技术有限公司 | Closed-loop automatic level control device for TDD mode communication system |
| CN102215070A (en) * | 2011-06-16 | 2011-10-12 | 武汉虹信通信技术有限责任公司 | Intelligent passband ripple calibration method for digital fiber optic repeater |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104443A (en) * | 2014-08-04 | 2014-10-15 | 山东科汇电力自动化股份有限公司 | Method and device for transmitting analog electrical signal through optical fiber |
| CN104104443B (en) * | 2014-08-04 | 2017-01-25 | 山东科汇电力自动化股份有限公司 | Method and device for transmitting analog electrical signal through optical fiber |
| CN107769798A (en) * | 2017-10-18 | 2018-03-06 | 青岛海信宽带多媒体技术有限公司 | A kind of method and device for controlling radio frequency output signal power invariability |
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Application publication date: 20121003 |