CN101989878A - Method for monitoring channel state in real time by measuring optical power on line - Google Patents
Method for monitoring channel state in real time by measuring optical power on line Download PDFInfo
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- CN101989878A CN101989878A CN2010105896934A CN201010589693A CN101989878A CN 101989878 A CN101989878 A CN 101989878A CN 2010105896934 A CN2010105896934 A CN 2010105896934A CN 201010589693 A CN201010589693 A CN 201010589693A CN 101989878 A CN101989878 A CN 101989878A
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Abstract
The invention discloses a method for monitoring channel state in real time by measuring optical power on line, which comprises the following steps of: (1) measuring an optical power-optical intensity curve table of an optical module in advance, and storing in a microprogrammed control unit (MCU); (2) integrating an optical intensity detection and conversion circuit in the optical module, establishing an A/D conversion circuit, and ensuring the measurement accuracy of A/D conversion on small signals by adopting a segmental amplification mode; (3) obtaining an A/D conversion result, and calculating an optical power value by adopting curve fit technology; and (4) establishing a perfect channel state monitoring and warning mechanism according to the optical power measuring result and the change conditions. The method for measuring and calculating the optical power on line fulfills the aim of detecting the optical power in real time on line under the condition of not disconnecting a fiber channel.
Description
Technical field
The present invention relates to the optical fiber telecommunications system of relay protection of power system, relate in particular to a kind of method that realizes channel status monitoring in real time and warning by the on-line measurement luminous power.
Background technology
A large amount of optical fiber telecommunications systems of using are finished data communication in the relay protection of power system at present, and fibre loss is the important parameter of reflection Fibre Optical Communication Technology index, are the key factors of transmission range, transmission stability and the reliability of decision optical fiber transmission network.Therefore, the correct transmission that helps guaranteeing information in the optical fiber communication is monitored in fibre loss in real time, guarantee the operate as normal of whole relaying protection system.
The common method of fibre loss inspection is to adopt cutback technique or insertion, transmitting optical power by measuring optical fiber, calculate the waste (attenuation) of optical fibre channel, to disconnect optical fiber transport channel during inspection, insert measuring light power equipment, and in measuring process, will plug a large amount of fiber connectors, easily making joint be subjected to dust in air pollutes, perhaps, influence optical signal transmission and actual measurement result because the contraposition of joint skew causes fault point extra in the optical channel.
To the transmission quality of fiber-optic signal in real time the common method of monitoring be signal to transmission, as the error rate, passage interruption etc., monitor, detect, come the problem that exists in the auxiliary examination channel transfer, but this method will take a large amount of cpu resources, and can only play the effect of auxiliary examination, can't find and locate concrete fault and hidden danger.For example, when optical-fibre channel coupled problem occurred owing to the fiber end face butt joint is inaccurate, the luminous power of the end of collecting mail can descend, the nargin deficiency that causes collecting mail, but still in the range of sensitivity of collecting mail, can not produce error code this moment, can't find this problem when checking with CPU.But when there was fault in system, just may cause collecting mail brought out faults such as existing error code, interruption.Even check out error code, can't judge that also optical power down causes error code, the error code that still middle transmission link causes unusually.
The received power of optical fiber communication is the key factor that influences channel quality, and the received power of fiber-optic signal is monitored in real time, is not only the important supplement of the method that the signal of transmission is monitored, and can discerns the passage hidden trouble that it can't be found.Conventional utilize luminous power--the light intensity corresponding relation carries out that the optical power measurement method pertinent literature is existing to be mentioned, referring to Wang Qian etc., luminous power On-line Measuring Method and application, Automation of Electric Systems, 2009,33(2).But this method of measurement based on lookup table mode is not only wasted storage resources, simultaneously precision not high (± 1dBm).
Summary of the invention
The objective of the invention is: propose luminous power real time on-line monitoring scheme, utilize measuring light power result and situation of change, set up perfect channel status monitoring and alarm mechanism based on curve fitting technique.
The technical solution adopted for the present invention to solve the technical problems is as follows:
(1) prior measuring light module luminous power-light intensity curve form stores is in MCU;
(2) integrated light intensity detects and translation circuit in the optical module; Set up the A/D change-over circuit, and the mode of taking segmentation to amplify, the certainty of measurement of A/D conversion when small-signal guaranteed;
(3) obtain adopting curve fitting technique to calculate optical power value after the A/D transformation result;
(4) utilize measuring light power result and situation of change, set up perfect channel status monitoring and alarm mechanism.
Particular content comprises:
(1) hardware implementations
A: integrated light intensity detects and translation circuit in the optical module of end of collecting mail: when carrying out measuring light power, the light intensity signal that needs the monitoring optical fibre channel, light intensity signal is provided by optical detection circuit, the operation principle of this circuit is after photodiode receives light signal in the optical fiber, the current signal I of generation and light intensity correspondence, the I-U change-over circuit that current signal I constitutes through operational amplifier converts voltage signal U output to, and this part circuit is integrated in the optical module.
B: set up the A/D change-over circuit, and take the mode of segmentation amplification that different strong and weak signals are taked different proportionality coefficients, be convenient to guarantee the certainty of measurement of A/D conversion when small-signal.But the A/D converter circuit both independently, also can utilize MCU built-in.
C: with MCU timing acquiring A/D transformation result (magnitude of voltage).
(2) curve fitting technique
A: luminous power and light intensity (being presented as voltage) have one-to-one relationship.Uniformly-spaced measure the level of light intensity signal under the different capacity in advance, and draw the contrast form according to measurement result, with this table storage in MCU (for saving memory space, be that 1dBm data are at interval stored by step-length, memory range is-10dBm～-38dBm).
B: when MCU collects the light intensity value of A/D conversion, the luminous power-light intensity data that utilizes MCU to store adopts curve fitting technique (interpolation technique), obtains corresponding optical power value, precision (± 0.1dBm).
(3) channel status monitoring and alarm mechanism
Utilize measuring light power result and situation of change, set up channel status monitoring and alarm mechanism.
A: when received optical power be lower than predefined power threshold (as-36dBm), send out " received power is crossed low the warning " information, some channel abnormal lamp;
B: when received optical power be higher than predefined power threshold (as-10dBm), send out " the too high warning of received power " information, some channel abnormal lamp;
C: the received power when recording channel puts into operation automatically, when on-line monitoring to received power when being lower than this and being worth a set threshold (the current received power of collection of letters merit rate – during as normal operation〉3dBm), illustrate that attenuation becomes big in the passage running, then may offside device transmitted power reduce, or passway is broken down device " received power transition warning " information by link.
Beneficial effect of the present invention is as follows: the present invention calculates the method for luminous power by on-line measurement, has realized disconnecting the target that optical-fibre channel just can real-time online detection luminous power.The mode of taking segmentation to amplify adopts curve fitting technique when different strong and weak signals are taked different proportionality coefficients and calculated luminous power, not only save storage resources, and precision is higher.Optical power value based on on-line measurement, set up perfect channel status monitoring and alarm mechanism, not only realize the warning that received power is too high and low excessively, can realize that more the passage attenuation slowly changes or the supervision of transition (changing back passage received power still within normal range (NR)), discern the passage hidden trouble that conventional channel status monitoring method can't be found.
Description of drawings
Fig. 1 luminous power on-line monitoring system schematic diagram.
Fig. 2 Lagrange's interpolation schematic diagram.
Embodiment
With reference to the accompanying drawings and in conjunction with the embodiments the present invention is described in further detail.
(1) hardware implementations
A: integrated light intensity detects and translation circuit in the optical module of end of collecting mail: when carrying out measuring light power, the light intensity signal that needs the monitoring optical fibre channel, light intensity signal is provided by optical detection circuit, the operation principle of this circuit is after photodiode receives light signal in the optical fiber, the current signal I of generation and light intensity correspondence, the I-U change-over circuit that current signal I constitutes through operational amplifier converts voltage signal U output to, and this part circuit is integrated in the optical module.
B: set up the A/D change-over circuit, and take the mode of segmentation amplification that different strong and weak signals are taked different proportionality coefficients, be convenient to guarantee the certainty of measurement of A/D conversion when small-signal.But the A/D converter circuit both independently, also can utilize MCU built-in.
C: with MCU timing acquiring A/D transformation result (magnitude of voltage).
(2) curve fitting technique
A: luminous power and light intensity (being presented as voltage) have one-to-one relationship.Because individual difference, the luminous power-light intensity curve of each optical module is also not quite identical, is to guarantee the high accuracy measured, measures the luminous power-light intensity curve form (test automatically) of each optical module in advance, and stores into respectively among separately the MCU.(for saving memory space, be that 1dBm data are at interval stored by step-length, memory range is-10dBm～-38dBm).
B: when MCU collects the light intensity value of A/D conversion, the luminous power-light intensity data that utilizes MCU to store adopts curve fitting technique (as Lagrange's interpolation algorithm or cubic spline interpolation), obtains corresponding optical power value, precision (± 0.1dBm).With Lagrange's interpolation algorithmic descriptions (as shown in Figure 3) is example:
If current sampling point light intensity voltage is
MV,
Near three known point light intensity voltages are respectively
,
,
MV, corresponding light intensity is
,
,
DBm(is stored among the MCU), then the corresponding light intensity of current sampling point is
:
(3) channel status monitoring and alarm mechanism
Utilize measuring light power result and situation of change, set up channel status monitoring and alarm mechanism.
A: when received optical power be lower than predefined power threshold (as-36dBm), send out " received power is crossed low the warning " information, some channel abnormal lamp;
B: when received optical power be higher than predefined power threshold (as-10dBm), send out " the too high warning of received power " information, some channel abnormal lamp;
C: the received power when recording channel puts into operation automatically, when on-line monitoring to received power when being lower than this and being worth a set threshold (the current received power of collection of letters merit rate – during as normal operation〉3dBm), illustrate that attenuation becomes big in the passage running, then may offside device transmitted power reduce, or passway is broken down device " received power transition warning " information by link.
Claims (4)
1. realize the channel status method of monitoring in real time by the on-line measurement luminous power, it is characterized in that, comprise the steps:
(1) prior measuring light module luminous power-light intensity curve form stores is in MCU;
(2) integrated light intensity detects and translation circuit in the optical module; Set up the A/D change-over circuit, and the mode of taking segmentation to amplify, the certainty of measurement of A/D conversion when small-signal guaranteed;
(3) obtain adopting curve fitting technique to calculate optical power value after the A/D transformation result;
(4) utilize measuring light power result and situation of change, set up perfect channel status monitoring and alarm mechanism.
2. the method that realizes the real-time monitoring of channel status by the on-line measurement luminous power according to claim 1, it is characterized in that, the built-in light intensity of optical module detects and the current/voltage-converted circuit, intensity signal is directly exported with the form of voltage signal, adopt the A/D change-over circuit, the beat of A/D conversion is controlled by MCU, and the result of A/D conversion can be received by MCU.
3. luminous power on-line real time monitoring method according to claim 1 is characterized in that, the mode that described step (2) takes segmentation to amplify is taked different proportionality coefficients to different strong and weak signals.
4. according to claim 1ly realize the channel status method of monitoring in real time, it is characterized in that, but the A/D change-over circuit both independently, also can utilize MCU built-in by the on-line measurement luminous power.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457657A (en) * | 2013-09-13 | 2013-12-18 | 许继集团有限公司 | Method for detecting states of optical module of relay protection device of intelligent substation |
| CN103616160A (en) * | 2013-11-27 | 2014-03-05 | 国家电网公司 | Optical fiber protecting channel on-line monitoring system |
| CN104993863A (en) * | 2015-06-10 | 2015-10-21 | 四川华拓光通信股份有限公司 | Optical module for network communication equipment test |
| CN105847032A (en) * | 2016-03-16 | 2016-08-10 | 国家电网公司 | Collection and analysis method of optical receiving level of Marconi transmission equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101141220A (en) * | 2007-05-23 | 2008-03-12 | 中兴通讯股份有限公司 | Optical power display and regulation device |
| CN101451885A (en) * | 2008-12-19 | 2009-06-10 | 西安电子科技大学 | Optical power measurement method |
| CN101718584A (en) * | 2008-10-10 | 2010-06-02 | 电子科技大学 | Method for calculating linearity and conversion efficiency of all-optimal sampling based on polynomial fitting |
-
2010
- 2010-12-15 CN CN2010105896934A patent/CN101989878A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141220A (en) * | 2007-05-23 | 2008-03-12 | 中兴通讯股份有限公司 | Optical power display and regulation device |
| CN101718584A (en) * | 2008-10-10 | 2010-06-02 | 电子科技大学 | Method for calculating linearity and conversion efficiency of all-optimal sampling based on polynomial fitting |
| CN101451885A (en) * | 2008-12-19 | 2009-06-10 | 西安电子科技大学 | Optical power measurement method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457657A (en) * | 2013-09-13 | 2013-12-18 | 许继集团有限公司 | Method for detecting states of optical module of relay protection device of intelligent substation |
| CN103616160A (en) * | 2013-11-27 | 2014-03-05 | 国家电网公司 | Optical fiber protecting channel on-line monitoring system |
| CN104993863A (en) * | 2015-06-10 | 2015-10-21 | 四川华拓光通信股份有限公司 | Optical module for network communication equipment test |
| CN105847032A (en) * | 2016-03-16 | 2016-08-10 | 国家电网公司 | Collection and analysis method of optical receiving level of Marconi transmission equipment |
| CN105847032B (en) * | 2016-03-16 | 2019-05-14 | 国家电网公司 | Marconi transmission device receives light level acquisition and analysis method |
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Application publication date: 20110323 |