CN201178419Y - Optical fiber straight-forward station based on open loop and close loop automatic gain control link - Google Patents
Optical fiber straight-forward station based on open loop and close loop automatic gain control link Download PDFInfo
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- CN201178419Y CN201178419Y CNU2008200458927U CN200820045892U CN201178419Y CN 201178419 Y CN201178419 Y CN 201178419Y CN U2008200458927 U CNU2008200458927 U CN U2008200458927U CN 200820045892 U CN200820045892 U CN 200820045892U CN 201178419 Y CN201178419 Y CN 201178419Y
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Abstract
The utility model provides an optic-fiber repeater which can realize the automatic gain control. The optic-fiber repeater bases on ring-opening AGC and ring-closure AGC, which comprises a local machine and a remote machine; the local machine and the remote machine are connected through fiber; the data transmission between the local machine and the remote machine are acted through the master-slave station communication; the automatic gain control of the optic-fiber repeater enables the uplink gain and the downlink gain to be constant through the ring-opening AGC of the optic-fiber repeater first and then through the ring-closure AGC. The optic-fiber repeater ensures the constant gain of the optic-fiber repeater during the project commencement and the subsequent using process, facilitates the field engineering design of an engineering designer, and lowers the subsequent maintenance cost of the optic-fiber repeater.
Description
Technical field
The utility model relates to the Mobile communication direct base station technology, is specifically related to a kind of optical fiber repeater based on open loop and closed loop automatic gain control (AGC) link.
Background technology
The block diagram of system of existing optical fiber repeater is made up of near-end machine and remote termination as shown in Figure 1.Mobile communication signal from mobile communication base station (01) locates to isolate downstream signal by coupler (02) back at the near-end duplexer (101) of near-end machine, send out the electric light conversion of module (103) through near-end light by near-end downlink radio frequency module (102), be modulated into light signal, pass through Optical Fiber Transmission, optical signal transmission is received module (111) to the far-end light of remote termination, be demodulated to radiofrequency signal after the opto-electronic conversion by far-end light receipts modules (111), this radiofrequency signal is through the gain adjustment of far-end downlink radio frequency module (112), after power amplifier module (113) amplification, output to cover antenna through far-end duplexer (117) and be transmitted into the interior travelling carriage (mobile phone) of the area of coverage, carry out the covering of mobile communication downlink link.The light that while near-end monitoring host computer module (106) is sent out module (103) by data wire timing sampling near-end light is sent out performance number, and is stored in the interior memory cell of near-end monitoring host computer module (106).And the light that remote monitoring host module (118) is received module (111) by data wire timing sampling far-end light is received performance number, and is stored in the interior memory cell of remote monitoring host module (118).And the signal of the emission of the travelling carriage (mobile phone) in the area of coverage, cover antenna by the remote termination place receives, isolate upward signal by far-end duplexer (117), amplify through low noise amplification module (116) and the up radio-frequency module of far-end (115), send out the electric light conversion of module (114) by far-end light, be modulated into light signal and arrive the near-end machine by Optical Fiber Transmission, receive module (104) at near-end light and demodulate upward signal through opto-electronic conversion, gain adjustment through the up radio-frequency module of near-end (105), behind near-end duplexer (101) and coupler (02), be transferred to mobile communication base station (01), finish the transmission of uplink signal.The light that while remote monitoring host module (118) is sent out module (114) by data wire timing sampling far-end light is sent out performance number, and is stored in the interior memory cell of remote monitoring host module (118).And the light that near-end monitoring host computer module (106) is received module (104) by data wire timing sampling near-end light is received performance number, and is stored in the interior memory cell of near-end monitoring host computer module (106).
The maximum optical path loss that existing optical fiber repeater can bear is generally 10dB.In the link gain design of optical fiber repeater, the link gain with optical fiber repeater designs according to the maximum optical path loss usually.
In the use of optical fiber repeater, based on connect near-end machine and remote termination optical fiber link can (as: 1. light signal transmits in optical fiber and has a certain amount of loss because of various factors, the optical path loss that transmits in monomode fiber as the light signal of 1310nm wavelength is the 0.35dB/ kilometer, and the optical path loss that the light signal of 1550nm wavelength transmits in monomode fiber is the 0.2dB/ kilometer.2. the optical adapter that connects two optical fiber, light signal also certain optical path loss can occur during by optical adapter.When 3. two optical fiber docked at the optical adapter place, the spot in fiber connector cross section also can make optical link the light path Insertion Loss occur.4. optical device is aging, sends out laser and light as light and receives the aging of laser and all can make optical fiber link the light path Insertion Loss occur.) the light path Insertion Loss appears, and cause the transmission of light signal that certain decay is arranged, thereby the link gain of optical fiber repeater is changed and unstable, promptly downlink gain can change because of the variation of environment for use and service life among Fig. 1.
Because the link gain of existing optical fiber repeater is to design according to the maximum optical path loss that can bear, in the field commissioning of the down link of optical fiber repeater, engineers and technicians are generally according to the covering fiber lengths estimation of down link so the light path Insertion Loss value that produces, again according to the output power value of locating at the far-end duplexer (117) of remote termination to detect with instrument, roughly calculate the required gain of optical fiber repeater down link, the downlink gain that the pad value of locating with the far-end downlink radio frequency module (112) of adjusting remote termination is adjusted optical fiber repeater manually is set by software.In the use of in the future optical fiber repeater, because of making the light path Insertion Loss of optical fiber link, various factors changes, the link gain of optical fiber repeater is changed, need carry out plant maintenance this moment to optical fiber repeater, again need the project planner to carry out the field commissioning change, to guarantee the operate as normal of optical fiber repeater.This design of existing optical fiber repeater makes engineering transfer the survey process to waste time and energy engineering design inconvenience, inaccurate, the maintenance cost height of equipment in the future.
The utility model content
The purpose of this utility model is to overcome deficiency and many drawbacks of existing fiber repeater, and a kind of optical fiber repeater based on open loop and closed loop automatic gain control (AGC) link is provided; Realize the automatic control of optical fiber repeater gain by Based Intelligent Control, avoided manual software setting is regulated the optical fiber repeater gain when engineering construction inconvenience and inaccurate problem, having avoided in the future in use, the light path Insertion Loss of optical fiber link changes the problem that causes the optical fiber repeater link gain to change and need the engineering staff to safeguard.
The purpose of this utility model is achieved through the following technical solutions: a kind of optical fiber repeater based on open loop and closed loop automatic gain control (AGC) link, comprise near-end machine, remote termination, and described near-end machine links to each other by optical fiber with remote termination; Described near-end machine comprises that near-end duplexer, near-end downlink radio frequency module, the up radio-frequency module of near-end, near-end light sends out module, near-end monitoring host computer module, near-end light and receive module; Described remote termination comprises that far-end light receives module, far-end downlink radio frequency module, power amplifier module, far-end duplexer, remote monitoring host module, far-end light and send out module, the up radio-frequency module of far-end, low noise amplification module; It is characterized in that: described far-end light receives module and near-end light receipts module all includes photoelectric conversion unit (O/E unit) and rf attenuation unit, and described photoelectric conversion unit is connected with the rf attenuation unit.
Described near-end monitoring host computer module is connected by data wire with the rf attenuation unit with the photoelectric conversion unit of near-end light receipts module simultaneously, obtains near-end light and receives the light receipts performance number of module and the up link pad value is set for near-end light receipts module rf attenuation unit.
Described remote monitoring host module is connected by data wire with the rf attenuation unit with the photoelectric conversion unit of far-end light receipts module simultaneously, obtains far-end light and receives the light receipts performance number of module and give the far-end light receipts module rf attenuation down link pad value that the unit is provided with.
Utilize the autocontrol method of the gain that above-mentioned optical fiber repeater based on open loop and closed loop auto-gain control chain circuit realizes, it is characterized in that comprising the steps: earlier by the gain of open loop AGC effect control optical fiber repeater, make the monitoring operate as normal of near-end machine and remote termination, the master-salve station communication between near-end machine and the remote termination is normal; By closed loop AGC effect, make system can carry out automatic gain control steadily in the long term then, make link gain constant, guarantee the working properly of optical fiber repeater.
Described open loop AGC effect comprises the open loop AGC control procedure of up link and the open loop AGC control procedure of down link.
Described closed loop AGC effect comprises the closed loop AGC control procedure of up link and the closed loop AGC control procedure of down link.
The open loop AGC control procedure of described down link is: when remote monitoring working properly, the light that the photoelectric conversion unit of far-end light receipts module will sample is received power P 1 and is issued the remote monitoring host module, (table 1 is when the light that far-end light is sent out module is sent out power and is YdBm to the remote monitoring host module is received power P 1 value according to light size at table 1, the attenuation that the light that far-end light is received module is received power and rf attenuation unit is relation table one to one) in find out the numerical value of corresponding pad value ATT1, this numerical value is issued the rf attenuation unit that light is received module by data wire, change the pad value of rf attenuation unit, make the gain reduction amount of rf attenuation unit that corresponding the variation be taken place, thereby make the gain of system link be tending towards normal.The open loop AGC control procedure of the open loop AGC control procedure of described up link and above-mentioned down link is similar.
Table 1
| P1(dBm) | ATT1(dB) |
| Y-1 | 18 |
| Y-1.5 | 17 |
| Y-2 | 16 |
| Y-2.5 | 15 |
| Y-3 | 14 |
| Y-3.5 | 13 |
| Y-4 | 12 |
| Y-4.5 | 11 |
| Y-5 | 10 |
| Y-5.5 | 9 |
| Y-6 | 8 |
| Y-6.5 | 7 |
| Y-7 | 6 |
| Y-7.5 | 5 |
| Y-8 | 4 |
| Y-8.5 | 3 |
| Y-9 | 2 |
| Y-9.5 | 1 |
| Y-10 | 0 |
The detailed process of the closed loop AGC of described down link control is: when near-end monitoring host computer module and remote monitoring host module working properly, master-salve station communication between near-end machine and the remote termination is also normal, the light that near-end monitoring host computer module samples electrooptic switching element is sent out power P 0 and is issued the remote monitoring host module by master-salve station communication, the light that the remote monitoring host module samples photoelectric conversion unit is received power P 1 and is subtracted each other with P0, obtain the changing value Δ of luminous power, the remote monitoring host module is found out the numerical value of corresponding pad value ATT2 in table 2 according to the size of Δ value, this numerical value is issued the rf attenuation unit that far-end light is received module, change the pad value of rf attenuation unit, make the gain reduction amount of rf attenuation unit that corresponding the variation be taken place, thereby also changed the gain of link.
The changing value Δ of the data value of table 2 and luminous power is one to one.In the daily use of optical fiber repeater, when (real is the light path Insertion Loss) changes because factors such as environmental change and device aging make Δ, the rf attenuation unit also can change to the gain reduction amount of link, so that the gain of optical fiber repeater link maintenance is constant.The closed loop AGC control procedure of described up link and the closed loop AGC control procedure of described down link are similar.
Table 2
| Δ(dBm) | ATT2(dB) |
| 0 | X |
| 0.5 | X-1 |
| 1 | X-2 |
| 1.5 | X-3 |
| 2 | X-4 |
| 2.5 | X-5 |
| 3 | X-6 |
| 3.5 | X-7 |
| 4 | X-8 |
| 4.5 | X-9 |
| 5 | X-10 |
| 5.5 | X-11 |
| 6 | X-12 |
| 6.5 | X-13 |
| 7 | X-14 |
| 7.5 | X-15 |
| 8 | X-16 |
| 8.5 | X-17 |
| 9 | X-18 |
| 9.5 | X-19 |
| 10 | X-20 |
There are two tables of data in this optical fiber repeater down link, represent two relations one to one, one is received the photoelectric conversion unit of module for far-end light light is received performance number and far-end light and is received between the attenuation of rf attenuation unit of module and concern one to one, as table 1, its two light of receiving the module photoelectric conversion unit for far-end light is received light that power and described near-end light sends out module and is sent out power difference and far-end light and receive between the attenuation of rf attenuation unit of module and concern one to one, as table 2, data table stores is in the memory cell of remote monitoring host module.And also there are two tables of data in up link, represent two relations one to one, one is received the photoelectric conversion unit of module for near-end light light is received performance number and near-end light and is received between the attenuation of rf attenuation unit of module and concern one to one, also as shown in table 1, its two light of receiving the module photoelectric conversion unit for near-end light is received power and far-end light and is sent out difference that the light of module sends out power and near-end light and receive between the attenuation of rf attenuation unit of module and concern one to one.Data table stores is in the memory cell of remote monitoring host module, and is also as shown in table 2.
The near-end light of the utility model optical fiber repeater is sent out module and far-end light and is sent out the light of module and send out power and can all transfer to survey and be certain value (as 2dBm), far-end light is received rf attenuation unit that module and near-end light receives module also can be certain value (as 20dB) to the attenuation of link, the radio frequency Insertion Loss of the maximum optical path Insertion Loss correspondence that this can bear for optical fiber repeater.
The transmission course of the uplink and downlink signal of optical fiber repeater of the present utility model is: the signal that the mobile communication base station produces is sent to the near-end duplexer of near-end machine by coupler, the near-end diplexer separates goes out downstream signal, downstream signal is by after the near-end downlink radio frequency module of near-end machine, sending out module at near-end light is modulated into light signal and is sent to remote termination through optical fiber through the electric light conversion, near-end light is sent out light that module will sample and is sent out performance number and regularly send near-end monitoring host computer module to by data wire, and is stored in the memory cell in the near-end monitoring host computer module.The photoelectric conversion unit that far-end light is received module is that the signal of telecommunication is suitably decayed through the rf attenuation unit with converting optical signals, after far-end downlink radio frequency module and power amplifier module amplification, output to cover antenna through the far-end duplexer and be transmitted into the interior travelling carriage (mobile phone) of the area of coverage, finish the covering of mobile communication downlink link.Far-end light is received module and is regularly sent the light receipts performance number that photovoltaic element samples to the remote monitoring host module by data wire, and be stored in the interior memory cell of remote monitoring host module, and the remote monitoring host module also regularly sends to the down link pad value rf attenuation unit of far-end light receipts module and upgrades the attenuation of this unit to down link automatically by data wire.
The signal of travelling carriage (mobile phone) emission in the area of coverage, cover antenna by the remote termination place receives, go out upward signal by the far-end diplexer separates, amplify through low noise amplification module and the up radio-frequency module of far-end, send out the electric light conversion of module by far-end light, be modulated into light signal and arrive the near-end machine by Optical Fiber Transmission, far-end light is sent out light that module will sample and is sent out performance number and regularly send the remote monitoring host module to by data wire, and is stored in the memory cell in the remote monitoring host module.The photoelectric conversion unit that near-end light is received module is that the signal of telecommunication is suitably decayed through the rf attenuation unit with the converting optical signals that receives, behind the up radio-frequency module of near-end, near-end duplexer and coupler, be transferred to the mobile communication base station, finish the transmission of uplink signal.Near-end light is received module and is regularly sent the light receipts performance number that photovoltaic element samples to near-end monitoring host computer module by data wire, and be stored in the interior memory cell of near-end monitoring host computer module, and near-end monitoring host computer module also regularly sends to the up link pad value rf attenuation unit of near-end light receipts module and upgrades the attenuation of this unit to down link automatically by data wire.
Action principle of the present utility model is: when optical fiber repeater of the present utility model has just been switched on, the light that the photoelectric conversion unit of far-end light receipts module will sample is received performance number sends the remote monitoring host module to by data wire memory cell, the remote monitoring host module is according to table 1, find this light to receive the pad value of performance number correspondence, send pad value to rf attenuation unit that far-end light is received module by data wire, the attenuation that makes far-end light receive the rf attenuation unit of module is this numerical value.
Then wait the monitoring operate as normal of near-end machine and remote termination, master-salve station communication between near-end machine and the remote termination is also normal, near-end monitoring host computer module will be sent out performance number from the light that near-end light is sent out module samples by master-salve station communication and be transferred to remote termination, the remote monitoring host module with this light send out performance number and the far-end light that samples receive the light of module receive performance number compare subtract each other a difference, the remote monitoring host module is according to table 2, find this light to receive the pad value of power difference correspondence, send pad value to rf attenuation unit that far-end light is received module by data wire, the attenuation that makes far-end light receive the rf attenuation unit of module is this numerical value.In use in the future, if because every factor makes the light path Insertion Loss (promptly be light that far-end light is received module receive power and near-end light send out the light of module and send out difference between the power) of optical link change, then the remote monitoring host module can be according to table 2, find the pad value of the light path Insertion Loss correspondence of this optical fiber link, by data wire pad value is sent to the rf attenuation unit that far-end light is received module, make the rf attenuation unit change again to the attenuation of down link so that the downlink gain of optical fiber repeater keep constant.More than be the process of the open loop and the closed loop AGC control of the utility model optical fiber repeater down link, the control procedure of up link is also similar.
The utility model has following advantage and effect with respect to prior art: this optical fiber repeater has been realized the automatic control of gain by Based Intelligent Control, manual software setting is regulated the optical fiber repeater gain when engineering construction inconvenience and inaccurate shortcoming have been overcome, the problem of having avoided the light path Insertion Loss of optical fiber link variation in use in the future to cause the optical fiber repeater link gain to change and having needed the engineering staff to safeguard, thereby made things convenient for project planner's field engineering to design, avoid the designer because human error causes the error of engineering design, and reduced the maintenance cost of optical fiber repeater in the future.This optical fiber repeater has guaranteed that also optical fiber direct amplification stands in the working properly of moment of starting shooting on the engineering, its reason is as follows: when optical fiber repeater of the present utility model has just been switched on, for down link, the light that the photoelectric conversion unit of far-end light receipts module will sample is received performance number sends the remote monitoring host module to by data wire memory cell, the remote monitoring host module is according to table 1, find this light to receive the pad value of performance number correspondence, send pad value to rf attenuation unit that far-end light is received module by data wire, the attenuation that makes far-end light receive the rf attenuation unit of module is this numerical value, so just guaranteed that start output is during moment, remote termination down link power output correct, it is normal to have guaranteed that remote termination covers.And for up link, then near-end light is received the light that the photoelectric conversion unit of module will sample and is received performance number sends near-end monitoring host computer module to by data wire memory cell, near-end monitoring host computer module is according to table 1, find this light to receive the pad value of performance number correspondence, send pad value to rf attenuation unit that near-end light is received module by data wire, the attenuation that makes near-end light receive the rf attenuation unit of module is this numerical value, so just guaranteed that start output is during moment, near-end machine uplink output power correct guarantees that the near-end machine is to base station interference base station in start moment operate as normal and not.
Description of drawings
Fig. 1 is the structural representation of existing optical fiber repeater.
Fig. 2 is the structural representation of the utility model optical fiber repeater.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
Fig. 2 shows concrete structure of the present utility model, and as seen from Figure 2, this optical fiber repeater comprises near-end machine, remote termination, and described near-end machine links to each other by optical fiber with remote termination, and the transfer of data between described near-end machine and the remote termination is undertaken by master-salve station communication.
Described near-end machine comprises near-end duplexer (101), near-end downlink radio frequency module (102), the up radio-frequency module of near-end (105), near-end light is sent out module (103), near-end light is received module (104), near-end monitoring host computer module (107), described near-end light is received module (104) and is comprised photoelectric conversion unit O/E0 and rf attenuation unit ATT0, described near-end duplexer (101) is connected with the up radio-frequency module of near-end (105) with near-end downlink radio frequency module (102) simultaneously, described near-end downlink radio frequency module (102) is sent out module (103) with near-end light and is connected, the up radio-frequency module of described near-end (105) is received module (104) with near-end light and is connected, and described near-end monitoring host computer module (107) acquisition near-end light is sent out the light of module (103) and sent out performance number, near-end light is received the light of module (104) and is received performance number and undertaken for near-end light receipts module (104) the up link pad value that rf attenuation unit ATT0 is provided with by the data wire transmission.
Described remote termination comprises far-end light receipts module (111), far-end downlink radio frequency module (112), power amplifier module (113), far-end duplexer (117), far-end light is sent out module (114), the up radio-frequency module of far-end (115), low noise amplification module (116), remote monitoring host module (118), described far-end light is received module (111) and is comprised photoelectric conversion unit O/E1 and rf attenuation unit ATT1, described far-end light is received module (111) and is connected with far-end downlink radio frequency module (112), described far-end downlink radio frequency module (112) is connected with power amplifier module (113), described far-end duplexer (117) is connected with low noise amplification module (116) with power amplifier module (113) simultaneously, described far-end light is sent out module (114) and is connected with the up radio-frequency module of far-end (115), the up radio-frequency module of described far-end (115) is connected with low noise amplification module (116), and described remote monitoring host module (118) acquisition far-end light is sent out the light of module (114) and sent out performance number, far-end light is received the light of module (111) and is received performance number and undertaken for far-end light receipts module (111) the down link pad value that rf attenuation unit ATT1 is provided with by data wire.
The signal that mobile communication base station (01) produces is sent to the near-end duplexer (101) of near-end machine by coupler (02), near-end duplexer (101) is isolated downstream signal, downstream signal is by after the near-end downlink radio frequency module (102) of near-end machine, sending out module (103) at near-end light is modulated into light signal and is sent to remote termination through optical fiber through the electric light conversion, near-end light is sent out light that module (103) will sample and is sent out performance number and regularly send near-end monitoring host computer module (107) to by data wire, and is stored in the memory cell in the near-end monitoring host computer module (107).The photoelectric conversion unit O/E1 that far-end light is received module (111) is that the signal of telecommunication is suitably decayed through rf attenuation unit ATT1 with converting optical signals, after far-end downlink radio frequency module (112) and power amplifier module (113) amplification, output to cover antenna through far-end duplexer (117) and be transmitted into the interior travelling carriage (mobile phone) of the area of coverage, finish the covering of mobile communication downlink link.
The signal of travelling carriage (mobile phone) emission in the area of coverage, cover antenna by the remote termination place receives, isolate upward signal by far-end duplexer (117), amplify through low noise amplification module (116) and the up radio-frequency module of far-end (115), send out the electric light conversion of module (114) by far-end light, be modulated to light signal and arrive the near-end machine by Optical Fiber Transmission, far-end light is sent out light that module (114) will sample and is sent out performance number and regularly send remote monitoring host module (118) to by data wire, and is stored in the memory cell in the remote monitoring host module (118).The photoelectric conversion unit O/E0 that near-end light is received module (104) is that the signal of telecommunication is suitably decayed through rf attenuation unit ATT0 with the converting optical signals that receives, behind the up radio-frequency module of near-end (112), near-end duplexer (101) and coupler (02), be transferred to mobile communication base station (01), finish the transmission of uplink signal.
In the course of work of optical fiber repeater, far-end light is received module (111) and is regularly sent the light receipts performance number that photoelectric conversion unit O/E1 samples to remote monitoring host module (118) by data wire, and be stored in the interior memory cell of remote monitoring host module (118), and remote monitoring host module (118) also regularly sends to the down link pad value rf attenuation unit ATT1 of far-end light receipts modules (111) and upgrades the attenuation of this unit to down link automatically by data wire.And near-end light receipts modules (104) regularly send the light receipts performance number that photovoltaic element O/E0 samples to near-end monitoring host computer module (107) by data wire, and be stored in the interior memory cell of near-end monitoring host computer module (107), and near-end monitoring host computer module (107) also regularly sends to the up link pad value rf attenuation unit ATT0 of near-end light receipts modules (104) and upgrades the attenuation of this unit to down link automatically by data wire.
There are two tables of data in optical fiber repeater down link of the present utility model, represent two relations one to one, one is received the photoelectric conversion unit (O/E1) of modules (111) for far-end light light is received performance number and far-end light and is received between the attenuation of rf attenuation unit (ATT1) of modules (111) and concern one to one, as table 1, its two light of receiving module (111) photoelectric conversion units (O/E1) for far-end light is received power and described near-end light and is sent out the light of module (103) and send out power difference and far-end light and receive between the attenuation of rf attenuation unit (ATT1) of modules (111) and concern one to one, as table 2, data table stores is in the memory cell of remote monitoring host module (118).And also there are two tables of data in up link, represent two relations one to one, one is received the photoelectric conversion unit (O/E0) of modules (104) for near-end light light is received performance number and near-end light and is received between the attenuation of rf attenuation unit (ATT0) of module and concern one to one, as table 3, its two light of receiving module (104) photoelectric conversion units (O/E0) for near-end light is received power and far-end light and is sent out difference that the light of module (114) sends out power and near-end light and receive between the attenuation of rf attenuation unit of modules (104) and concern one to one.Data table stores is in the memory cell of remote monitoring host module (107), as table 4:
The light of table 1 down link is received the light of module and is received the attenuation that power/light is received module
| P2(dBm) | ATT(dB) | |
| 2 | 20 | |
| 1.5 | 19 | |
| 1 | 18 | |
| 0.5 | 17 | |
| 0 | 16 | |
| -0.5 | 15 | |
| -1 | 14 | |
| -1.5 | 13 | |
| -2 | 12 | |
| -2.5 | 11 | |
| -3 | 10 | |
| -3.5 | 9 | |
| -4 | 8 | |
| -4.5 | 7 | |
| -5 | 6 | |
| -5.5 | 5 | |
| -6 | 4 |
| -6.5 | 3 | |
| -7 | 2 | |
| -7.5 | 1 | |
| -8 | 0 |
The light of the optical transceiver module of table 2 down link is received power difference/light and is received the module attenuation
| Δ(dBm) | ATT(dB) | |
| 0 | 20 | |
| 0.5 | 19 | |
| 1 | 18 | |
| 1.5 | 17 | |
| 2 | 16 | |
| 2.5 | 15 | |
| 3 | 14 | |
| 3.5 | 13 | |
| 4 | 12 | |
| 4.5 | 11 | |
| 5 | 10 | |
| 5.5 | 9 | |
| 6 | 8 | |
| 6.5 | 7 | |
| 7 | 6 | |
| 7.5 | 5 | |
| 8 | 4 | |
| 8.5 | 3 | |
| 9 | 2 | |
| 9.5 | 1 | |
| 10 | 0 |
The light of table 3 up link is received the light of module and is received the attenuation that power/light is received module
| P2(dBm) | ATT(dB) | |
| 2 | 20 | |
| 1.5 | 19 | |
| 1 | 18 | |
| 0.5 | 17 | |
| 0 | 16 | |
| -0.5 | 15 | |
| -1 | 14 | |
| -1.5 | 13 | |
| -2 | 12 | |
| -2.5 | 11 | |
| -3 | 10 | |
| -3.5 | 9 | |
| -4 | 8 | |
| -4.5 | 7 | |
| -5 | 6 | |
| -5.5 | 5 | |
| -6 | 4 | |
| -6.5 | 3 | |
| -7 | 2 | |
| -7.5 | 1 | |
| -8 | 0 |
The light of the optical transceiver module of table 4 up link is received power difference/light and is received the module attenuation
| Δ(dBm) | ATT(dB) | |
| 0 | 20 | |
| 0.5 | 19 | |
| 1 | 18 | |
| 1.5 | 17 | |
| 2 | 16 |
| 2.5 | 15 | |
| 3 | 14 | |
| 3.5 | 13 | |
| 4 | 12 | |
| 4.5 | 11 | |
| 5 | 10 | |
| 5.5 | 9 | |
| 6 | 8 | |
| 6.5 | 7 | |
| 7 | 6 | |
| 7.5 | 5 | |
| 8 | 4 | |
| 8.5 | 3 | |
| 9 | 2 | |
| 9.5 | 1 | |
| 10 | 0 |
The near-end light of optical fiber repeater of the present utility model is sent out module (103) and far-end light and is sent out the light of module (114) and send out power and all debug at certain value (2dBm), the initial decay value that the rf attenuation unit ATT1 of far-end light receipts modules (111) and near-end light are received the rf attenuation unit ATT0 of modules (104) is the radio frequency Insertion Loss that optical fiber repeater bears maximum optical path Insertion Loss correspondence, be 20dB, promptly above-mentioned two rf attenuation unit are 20dB to the initial decay amount of link.
Effect flow process of the present utility model is earlier by open loop AGC effect, and the gain of control optical fiber repeater then by closed loop AGC effect, controls the automatic gain that carries out that system can long-term stability, assurance optical fiber repeater working properly.
When optical fiber repeater of the present utility model has just been switched on, the light that the photoelectric conversion unit O/E1 of far-end light receipts modules (111) will sample is received performance number sends remote monitoring host module (118) to by data wire memory cell, the remote monitoring host module is according to table 1, find this light to receive the pad value of performance number correspondence, send pad value to rf attenuation unit ATT1 that far-end light is received module (111) by data wire, the attenuation that makes far-end light receive the rf attenuation unit ATT1 of module (111) is this numerical value.As: when the optical fiber repeater remote monitoring detects light receipts power be-2dBm, the remote monitoring host module is according to table 1, the decay numerical value of 12dB is passed to the rf attenuation unit that far-end light is received module 111 by data wire, make its attenuation become 12dB by 20dB to link, bucking-out system gain 8dB, system gain is adjusted, and this section is open loop AGC control.
Then wait the monitoring operate as normal of near-end machine and remote termination, master-salve station communication between near-end machine and the remote termination is also normal, near-end monitoring host computer module (107) will be sent out performance number from the light that near-end light is sent out module (103) sampling by master-salve station communication and be transferred to remote termination, remote monitoring host module (118) with this light send out performance number and the far-end light that samples receive the light of modules (111) receive performance number compare subtract each other a difference, the remote monitoring host module is according to table 2, find this light to receive the pad value of power difference correspondence, send pad value to rf attenuation unit ATT1 that far-end light is received module (111) by data wire, the attenuation that makes far-end light receive the rf attenuation unit ATT1 of module (111) is this numerical value.As: when the master-salve station of near-end and far-end is communicated by letter normal, the remote monitoring host module receives that the light that near-end is sent sends out power 2dBm, receiving power-2dBm with the light of far-end again deducts light and sends out power, obtain light path Insertion Loss 4dB, the remote monitoring host module is according to table 2, finding out the pad value of receiving the rf attenuation unit of module to far-end light is set is 12dB, this value is sent to the rf attenuation unit that far-end light is received module by data wire, making the attenuation to down link of this unit is 12dB, and this section is closed loop AGC control.Because the light path Insertion Loss is 4dB, the radio frequency Insertion Loss that light path is brought is 8dB, and after closed loop AGC control, the attenuation of rf attenuation unit is 12dB, has compensated the light path Insertion Loss to the 8dB attenuation that down link produces, and makes system gain keep constant.
In use in the future, if because every factor makes the light path Insertion Loss (promptly be light that far-end light is received modules (111) receive power and near-end light send out the light of module (103) and send out difference between the power) of optical link change, then remote monitoring host module (118) can be according to table 2, find the pad value of the light path Insertion Loss correspondence of this optical fiber link, by data wire pad value is sent to the rf attenuation unit ATT1 that far-end light is received module (111), make rf attenuation unit ATT1 change again to the attenuation of down link so that the downlink gain of optical fiber repeater keep constant.As: light is sent out power because laser ageing becomes 1.5dBm, and the light receipts power that far-end light is received module is-4dBm; It is 5.5dB that the remote monitoring host module then calculates the light path Insertion Loss according to above-mentioned value, with reference to table 2, finds out corresponding attenuation 9dB, and these data are issued the rf attenuation unit, and making its attenuation to down link is 9dB.Because attenuation becomes 5.5dB by 4dB, promptly light path has increased by 3 to the rf attenuation of signal.But the rf attenuation unit becomes 9dB to the decay of down link by 12dB, has reduced the decay of 3dB, promptly compensates the loss of light path Insertion Loss to link gain by the rf attenuation unit by the attenuation of adjusting link, to keep the constant of gain.
More than be the process of the open loop and the closed loop AGC control of optical fiber repeater down link of the present utility model, the control procedure of up link is same reason.
The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (3)
1, a kind of optical fiber repeater based on open loop and closed loop auto-gain control chain circuit comprises near-end machine, remote termination, and described near-end machine links to each other by optical fiber with remote termination; Described near-end machine comprises that near-end duplexer, near-end downlink radio frequency module, the up radio-frequency module of near-end, near-end light sends out module, near-end monitoring host computer module, near-end light and receive module; Described remote termination comprises that far-end light receives module, far-end downlink radio frequency module, power amplifier module, far-end duplexer, remote monitoring host module, far-end light and send out module, the up radio-frequency module of far-end, low noise amplification module; It is characterized in that: described far-end light receives module and near-end light receipts module all includes photoelectric conversion unit and rf attenuation unit, and described photoelectric conversion unit is connected with the rf attenuation unit.
2, the optical fiber repeater based on open loop and closed loop auto-gain control chain circuit according to claim 1, it is characterized in that: described near-end monitoring host computer module is connected by data wire with the rf attenuation unit with the photoelectric conversion unit of near-end light receipts module simultaneously, obtains near-end light and receives the light receipts performance number of module and the up link pad value is set for near-end light receipts module rf attenuation unit.
3, the optical fiber repeater based on open loop and closed loop auto-gain control chain circuit according to claim 1, it is characterized in that: described remote monitoring host module is connected by data wire with the rf attenuation unit with the photoelectric conversion unit of far-end light receipts module simultaneously, obtains far-end light and receives the light receipts performance number of module and give the far-end light receipts module rf attenuation down link pad value that the unit is provided with.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200458927U CN201178419Y (en) | 2008-04-03 | 2008-04-03 | Optical fiber straight-forward station based on open loop and close loop automatic gain control link |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200458927U CN201178419Y (en) | 2008-04-03 | 2008-04-03 | Optical fiber straight-forward station based on open loop and close loop automatic gain control link |
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|---|---|
| CN201178419Y true CN201178419Y (en) | 2009-01-07 |
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| CNU2008200458927U Expired - Fee Related CN201178419Y (en) | 2008-04-03 | 2008-04-03 | Optical fiber straight-forward station based on open loop and close loop automatic gain control link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510308A (en) * | 2011-11-08 | 2012-06-20 | 绥中时骏科技有限公司 | Automatic test compensation device and compensation method of indoor distribution system chain transmission attenuation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510308A (en) * | 2011-11-08 | 2012-06-20 | 绥中时骏科技有限公司 | Automatic test compensation device and compensation method of indoor distribution system chain transmission attenuation |
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