CN102045114B - Method for automatically compensating ascending optical loss gain and near end of optical fiber repeater - Google Patents
Method for automatically compensating ascending optical loss gain and near end of optical fiber repeater Download PDFInfo
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- CN102045114B CN102045114B CN201010618678.8A CN201010618678A CN102045114B CN 102045114 B CN102045114 B CN 102045114B CN 201010618678 A CN201010618678 A CN 201010618678A CN 102045114 B CN102045114 B CN 102045114B
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Abstract
The invention is suitable for the field of mobile communication, and provides a method for automatically compensating the ascending optical loss gain of an optical fiber repeater and the near end of the optical fiber repeater. The method provided by the invention comprises the following steps: combining optical signals transmitted through optical fibers at the multi-path far end by utilizing an optical combiner at the near end; detecting the optical power of the optical signals output by the optical combiner to obtain the optical power value actually accepted; calculating the optical loss value required to be compensated according to the optical power value actually accepted, the combination number of the optical combiner and the preset lossless value, and outputting the corresponding radio frequency gain compensation value; and compensating by a gain regulator at the near end according to the radio frequency gain compensation value. By utilizing the superposition and loss characteristics of the optical combiner on each path of far-end optical power, the embodiment of the invention directly realizes the automatic compensation at the near end, solves the noise problem and does not need to consider the complicated gain allocation at the near end and the far end.
Description
Technical field
The invention belongs to moving communicating field, relate in particular to method and the end of optical fiber repeater of the Gain Automatic compensation of the up light loss of a kind of optical fiber repeater.
Background technology
Optical fiber repeater is made up of near-end and one or more far-ends, and centre is connected by optical fiber.Close the factors such as road, fiber lengths, optical fiber splice due to fiber optic splitter and all can produce optical path loss, the also therefore loss of the rf gain of complete machine, compensates thereby need to carry out gain-adjusted.Do not relate to noise problem for descending gain-adjusted, no matter be manually or automatically, the way of industry is basically identical, regulates respectively the gain of each far-end.
And up gain-adjusted is because noise objective problem becomes more complicated, the normal method adopting comprises following 3 kinds at present:
1, manually regulate respectively the up gain of near-end and each far-end.While adopting in this way, the engineering staff who needs experience to enrich very much, carries out the Calculation of Optical Path and nearly far-end gain distributes, and when especially far-end number is many, work on the spot amount is very large.
2, automatically regulate far-end up by the method for linkage from top to bottom according to descending gain compensation at each far-end.While adopting which, regulate to concentrate on far-end and sharply worsen noise objective, for improving the up design of having to adopt higher cost of the nearly far-end of noise objective.
3, near-end and each far-end carry out the automatic gain control of radio frequency link.Calculate based on radio-frequency power collection, non-direct compensation light loss gain, consider that nearly far-end gain distributes and noise problem algorithm complexity, depends on communication interaction between nearly far-end, and reliability is low and Software for Design is complicated.
Summary of the invention
In order to address the above problem, the object of the embodiment of the present invention is to provide the method for the Gain Automatic compensation of the up light loss of a kind of optical fiber repeater.
The embodiment of the present invention is achieved in that the method for the Gain Automatic compensation of the up light loss of a kind of optical fiber repeater, it is characterized in that, said method comprising the steps of:
The optical combiner of near-end closes road to multichannel far-end through the light signal of Optical Fiber Transmission;
Light signal to optical combiner output carries out luminous power detection, obtains actual measurement and receives optical power value;
Close road number and default lossless value according to described actual measurement receipts optical power value, optical combiner, calculate the light loss value that needs compensation, and export corresponding rf gain offset, specifically comprise:
Utilize computing formula L=X-Y+10lgN to calculate the light loss value L that needs compensation,
Utilize computing formula Z=2L to calculate rf gain offset Z, and export rf gain offset Z,
Described N is that optical combiner closes road number, and X is the lossless value of presetting, and Y is actual measurement receipts optical power value, described X >=Y, and N is greater than 0 natural number;
The fader of near-end compensates according to described rf gain offset.
Further, described N is greater than 0 natural number that is less than 9.
Another object of the embodiment of the present invention is to provide a kind of end of optical fiber repeater, and described near-end comprises:
Optical combiner, for closing road to multichannel far-end through the light signal of Optical Fiber Transmission;
Luminous power detection module, carries out luminous power detection to the light signal of optical combiner output, obtains actual measurement and receives optical power value;
Computing module, is connected with described luminous power detection module, for closing road number and default lossless value according to described actual measurement receipts optical power value, optical combiner, calculates the light loss value that needs compensation, and exports corresponding rf gain offset;
Fader, is connected with described computing module, for compensating according to described rf gain offset;
Described computing module comprises:
Light loss value computing module, for utilizing computing formula L=X-Y+10lgN to calculate the light loss value L that needs compensation;
Rf gain compensation value calculation module, for utilizing computing formula Z=2L to calculate rf gain offset Z, and exports rf gain offset Z;
Described N is that optical combiner closes road number, and X is the lossless value of presetting, and Y is actual measurement receipts optical power value, described X >=Y, and N is greater than 0 natural number.
Further, described N is greater than 0 natural number that is less than 9.
In an embodiment of the present invention, utilize stack and the loss characteristic of optical combiner to every great distance end luminous power, directly on near-end, realized auto-compensation, solved noise problem, do not needed to consider that complicated nearly far-end gain distributes.And the automatic compensation algorithm of employing is simply effective, auto-compensation desired parameters all obtains from near-end, regulates and also completes at near-end, without communication interaction between nearly far-end, even communication failure also can auto-compensation between nearly far-end.And Software for Design and debugging are simple, reliability is high.
Brief description of the drawings
Fig. 1 is the optical fiber repeater up link block diagram that the embodiment of the present invention provides;
Fig. 2 is the structural representation of the computing module that provides of the embodiment of the present invention;
Fig. 3 is the flow chart of the method for the Gain Automatic compensation of up light loss that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the optical fiber repeater up link that the embodiment of the present invention provides, and describes the problem for convenience, has saved other part unrelated to the invention.
End of optical fiber repeater with far-end number determined by Practical Project, the embodiment of the present invention be typical 1 holder 4.The up input of 4 great distance ends, after gain-adjusted, is carried out radiofrequency signal to light signal conversion, arrives near-end through Optical Fiber Transmission.Optical combiner 10 closes road to the light signal of multichannel (4 tunnel) far-end.Optical combiner 10 output optical signals, pass to luminous power detection module 12 by light to radio frequency modular converter.Meanwhile, the light signal that light is exported optical combiner 10 to radio frequency modular converter is changed, and converts radiofrequency signal input gain adjuster 16 to.Another side, luminous power detection module 12 carries out luminous power detection to the light signal of optical combiner output, obtains actual measurement and receives optical power value.Computing module 14 is connected with described luminous power detection module 12, and computing module 14 closes road number and default lossless value according to described actual measurement receipts optical power value, optical combiner, calculates the light loss value that needs compensation, and exports corresponding rf gain offset.Fader 16 is connected with described computing module 14, and fader 16 compensates according to described rf gain offset, the radiofrequency signal after output compensation.
Consulting Fig. 2, is the structure of the computing module that provides in the embodiment of the present invention, and this computing module comprises: light loss value computing module 141, rf gain compensation value calculation module 142.
Light loss value computing module 141 utilizes computing formula L=X-Y+10lgN to calculate the light loss value L that needs compensation, and rf gain compensation value calculation module 142 utilizes computing formula Z=2L to calculate rf gain offset Z, and exports rf gain offset Z.
This N is that optical combiner closes road number, and X is the lossless value (being exactly receipts optical power value in the ideal situation in fact) of presetting, and Y is actual measurement receipts optical power value, described X >=Y, and N is greater than 0 natural number.Wherein, N=1,2,3 ..., in actual design, be at present 8 to the maximum, that is to say that current N is greater than 0 natural number that is less than 9.
In order to be illustrated more clearly in problem, now illustrate as follows: closing road number for 1 holder 4 optical combiners is N=4, X=2dBm, Y=-1dBm, like this, light loss value L=2-1+10lg4 ≈ 7dB, rf gain offset Z=14dB.
Consult Fig. 3, the flow process of the method for the Gain Automatic compensation of up light loss that the embodiment of the present invention provides, details are as follows:
In step S101, the optical combiner of near-end closes road to multichannel far-end through the light signal of Optical Fiber Transmission.
In step S102, the light signal of optical combiner output is carried out to luminous power detection, obtain actual measurement and receive optical power value.
In step S103, close road number and default lossless value according to described actual measurement receipts optical power value, optical combiner, calculate the light loss value that needs compensation, and export corresponding rf gain offset.
This step comprises again step: utilize computing formula L=X-Y+10lgN to calculate the light loss value L of needs compensation; And utilize computing formula Z=2L to calculate rf gain offset Z, and export rf gain offset Z.
This N is that optical combiner closes road number, and X is the lossless value (being exactly receipts optical power value in the ideal situation in fact) of presetting, and Y is actual measurement receipts optical power value, described X >=Y, and N is greater than 0 natural number.Wherein, N=1,2,3 ..., in actual design, be at present 8 to the maximum, that is to say that current N is greater than 0 natural number that is less than 9.
In step S104, the fader of near-end compensates according to described rf gain offset.
In sum, light loss auto-compensation of the present invention completes at near-end, has utilized stack and the loss characteristic of optical combiner to every great distance end luminous power, therefore, concerning all far-ends, offset is a compromise value, instead of each far-end is carried out respectively to fine compensation.The auto-compensation completing by this algorithm in actual applications can meet large portion project situation does not need to do compensation very accurately, and it is very convenient that engineering staff opens maintenance.The gain-adjusted function of far-end routine still retains in addition, does manual precise fine-adjustment compensation (finely tuning little to noise effect) when the particular/special requirement to meet user.
And, directly on near-end, realize auto-compensation, solve noise problem, do not need to consider that complicated nearly far-end gain distributes.Specific automatic compensation algorithm is simply effective, can draw good compromise offset for different far-end situations and number, make to open easy to maintenance, auto-compensation desired parameters all obtains from near-end, regulate and also complete at near-end, without communication interaction between nearly far-end, even communication failure also can auto-compensation between nearly far-end.And Software for Design and debugging are simple, reliability is high.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a method for the Gain Automatic compensation of the up light loss of optical fiber repeater, is characterized in that, said method comprising the steps of:
The optical combiner of near-end closes road to multichannel far-end through the light signal of Optical Fiber Transmission;
Light signal to optical combiner output carries out luminous power detection, obtains actual measurement and receives optical power value;
Close road number and default lossless value according to described actual measurement receipts optical power value, optical combiner, calculate the light loss value that needs compensation, and export corresponding rf gain offset, specifically comprise:
Utilize computing formula L=X-Y+10lgN to calculate the light loss value L that needs compensation,
Utilize computing formula Z=2L to calculate rf gain offset Z, and export rf gain offset Z,
Described N is that optical combiner closes road number, and X is the lossless value of presetting, and Y is actual measurement receipts optical power value, described X >=Y, and N is greater than 0 natural number;
The fader of near-end compensates according to described rf gain offset.
2. method according to claim 1, is characterized in that, described N is greater than 0 natural number that is less than 9.
3. an end of optical fiber repeater, is characterized in that, described near-end comprises:
Optical combiner, for closing road to multichannel far-end through the light signal of Optical Fiber Transmission;
Luminous power detection module, carries out luminous power detection to the light signal of optical combiner output, obtains actual measurement and receives optical power value;
Computing module, is connected with described luminous power detection module, for closing road number and default lossless value according to described actual measurement receipts optical power value, optical combiner, calculates the light loss value that needs compensation, and exports corresponding rf gain offset;
Fader, is connected with described computing module, for compensating according to described rf gain offset;
Described computing module comprises:
Light loss value computing module, for utilizing computing formula L=X-Y+10lgN to calculate the light loss value L that needs compensation;
Rf gain compensation value calculation module, for utilizing computing formula Z=2L to calculate rf gain offset Z, and exports rf gain offset Z;
Described N is that optical combiner closes road number, and X is the lossless value of presetting, and Y is actual measurement receipts optical power value, described X >=Y, and N is greater than 0 natural number.
4. end of optical fiber repeater according to claim 3, is characterized in that, described N is greater than 0 natural number that is less than 9.
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| CN102299738B (en) * | 2011-07-01 | 2015-05-13 | 华为技术有限公司 | Method for acquiring optical network link performance parameters and device thereof |
| CN105450307A (en) * | 2015-12-11 | 2016-03-30 | 宁波环球广电科技有限公司 | Radio frequency amplification circuit and optical receiver for optical fiber radio frequency communication network |
| CN106936502B (en) * | 2016-12-27 | 2024-02-13 | 南京泰通科技股份有限公司 | GSM-R repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation |
| WO2020191725A1 (en) * | 2019-03-28 | 2020-10-01 | 华普特科技（深圳）股份有限公司 | Wireless communication method and system, and main unit and remote unit |
| CN113219828B (en) * | 2021-04-22 | 2022-07-05 | 中国电子科技集团公司第二十九研究所 | Control method for gain consistency of multi-channel analog optical module |
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| CN101257350A (en) * | 2008-04-03 | 2008-09-03 | 京信通信系统（中国）有限公司 | Optical fiber straight amplification station based on opened loop and closed loop auto-gain control chain circuit |
| CN101465698A (en) * | 2008-12-30 | 2009-06-24 | 福建先创电子有限公司 | Power compensation method of optical fiber direct amplification machine |
| CN101599790A (en) * | 2009-01-08 | 2009-12-09 | 武汉盛华微系统技术股份有限公司 | A kind of intelligent micropower optical fiber wireless covering system |
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| CN101257350A (en) * | 2008-04-03 | 2008-09-03 | 京信通信系统（中国）有限公司 | Optical fiber straight amplification station based on opened loop and closed loop auto-gain control chain circuit |
| CN101465698A (en) * | 2008-12-30 | 2009-06-24 | 福建先创电子有限公司 | Power compensation method of optical fiber direct amplification machine |
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