CN103323106B - A kind of luminous power test macro - Google Patents
A kind of luminous power test macro Download PDFInfo
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- CN103323106B CN103323106B CN201310231561.8A CN201310231561A CN103323106B CN 103323106 B CN103323106 B CN 103323106B CN 201310231561 A CN201310231561 A CN 201310231561A CN 103323106 B CN103323106 B CN 103323106B
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Abstract
Embodiments provide a kind of luminous power test macro, be connected with optical fiber communication equipment by lightguide cable link, comprise: for receiving the optical splitter of described optical fiber communication equipment light signal; The light power meter be connected with described optical splitter, described light power meter comprises the photodetector, I/V translation circuit, programmable amplifying circuit, low-pass filter circuit, the negative feedback circuit for rectifying be made up of Differential Input and voltage follower, A/D change-over circuit, the on-site programmable gate array FPGA data processing module that connect successively, and to the power module that described FPGA data processing module is powered.The light signal collected arrives low-pass filter circuit after treatment, the negative feedback circuit for rectifying that the voltage signal exported forms through Differential Input and voltage follower, can in real time to gather and amplifying signal input accurately, greatly reduce error originated from input, improve the measuring accuracy of light signal.
Description
Technical field
The present invention relates to luminous power field tests, relate to a kind of luminous power test macro in particular.
Background technology
The communication quality of any transmission system is all relevant with the signal to noise ratio (S/N ratio) of signal, signal to noise ratio (S/N ratio) is higher, communication quality is also better, and for the receiver that is determined, signal to noise ratio (S/N ratio) is relevant with signal light power, as signal light power is larger, signal to noise ratio (S/N ratio) is also higher, therefore, and can using the mass parameter of the signal light power in optical-fibre communications as communication, that is, the object of inspection fiber-optic communication signals quality can be reached by the signal light power in measuring fiber communication.
Along with the development of Fibre Optical Communication Technology and the progress of China's national grid and electric generating station system, luminous power testing apparatus is widely used in the middle of the light signal supervisory system of rural power grids and communication service industry, and traditional luminous power checkout equipment is usually because measuring accuracy is on the low side, when can only be applied in lower to light signal accuracy requirement.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of luminous power test macro, in order to improve the measuring accuracy of light signal.
A kind of luminous power test macro, is connected with optical fiber communication equipment by lightguide cable link, comprises:
For receiving the optical splitter of described optical fiber communication equipment light signal;
The light power meter be connected with described optical splitter, described light power meter comprises the photodetector, I/V translation circuit, programmable amplifying circuit, low-pass filter circuit, the negative feedback circuit for rectifying be made up of Differential Input and voltage follower, A/D change-over circuit, the on-site programmable gate array FPGA data processing module that connect successively, and to the power module that described FPGA data processing module is powered.
Preferably, in above-mentioned luminous power test macro, described optical splitter is the optical splitter of 95:5.
Preferably, in above-mentioned luminous power test macro, PC host computer is also comprised.
Preferably, in above-mentioned luminous power test macro, described FPGA data processing module comprises reserved multiple communication interfaces.
Preferably, in above-mentioned luminous power test macro, described FPGA data processing module comprises static RAM SRAM and/or read-only memory ROM.
There is in technique scheme following beneficial effect:
The light signal collected arrives low-pass filter circuit after treatment, the negative feedback circuit for rectifying that the voltage signal exported forms through Differential Input and voltage follower, can in real time to gather and amplifying signal input accurately, greatly reduce error originated from input, improve the measuring accuracy of light signal.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
A kind of structural representation of the luminous power test macro that Fig. 1 provides for the embodiment of the present invention;
A part of electrical block diagram of the luminous power test macro that Fig. 2 provides for the embodiment of the present invention;
Another part electrical block diagram of the luminous power test macro identical with Fig. 2 that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the FPGA data processing module that Fig. 4 provides for the embodiment of the present invention;
Another structural representation of the luminous power test macro that Fig. 5 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, the embodiment of the present invention provides a kind of luminous power test macro, is connected with optical fiber communication equipment by lightguide cable link, and luminous power test macro comprises:
For receiving the optical splitter 100 of optical fiber communication equipment light signal;
The light power meter 200 be connected with optical splitter, light power meter 200 comprises the photodetector 210, I/V translation circuit 220, programmable amplifying circuit 230, low-pass filter circuit 240, the negative feedback circuit for rectifying 250 be made up of Differential Input and voltage follower, A/D change-over circuit 260, the FPGA(Field-ProgrammableGateArray that connect successively, i.e. field programmable gate array) data processing module 270, and to the power module 280 that FPGA data processing module is powered.
The electric signal collected arrives low-pass filter circuit 240 after treatment, the negative feedback circuit for rectifying 250 that the voltage signal exported forms through Differential Input and voltage follower, negative feedback circuit for rectifying 250 can in real time to gather and amplifying signal input accurately, reduce error originated from input widely, improve the measuring accuracy of light signal.
The light signal that optical fiber communication equipment generator sends is transmitted by lightguide cable link, optical splitter receives the light signal that optical fiber communication equipment sends, in order to the quality of transmitting optical signal can better be detected, reduce the impact on optical-fibre communications, the optical splitter of 95:5 can be selected, select less splitting ratio, namely the light signal of 5% enters photodetector.By will the light signal of 5% being had to enter photodetector after optical splitter, the cooperative device optical transceiver module that all the other light of 95% enter this test macro carries out the test of optical BER.
See Fig. 2-3, show a kind of circuit diagram of luminous power test macro, wherein, in Fig. 2, be designated the connection being designated B in the circuit of A and Fig. 3.Photodetector 210 can select InGaAs series GT322D type.The optical responsivity of this photodetector is for being more than or equal to 0.85A/W, maximum forward current value is 10mA, has noise low, and frequency of operation is high, spectral response curve is steady, the features such as output current is large, and reliability is high, and the rear output current of conversion is larger, faint signal can be changed into larger electric current to export, on relative broad range, well can meet the measurement needs of signal, reduce error when noise and signal conversion, ensure measuring accuracy.Enter the light (5%) of light power meter by the electric current that magnitude reaches mA rank can be produced after above-mentioned photodetector in the normal situation of illumination, maximumly reach 10mA, by the I/V translation circuit 220 be connected with photodetector, can the electric current that photodetector exports be converted to voltage signal and export.I/V translation circuit can select the typical application circuit of above-mentioned GT322D type photodetector to add filter capacitor, current-limiting resistance, sample resistance, can meet the conversion of electric current to voltage like this, also can simplify circuit, reduces the power consumption of monoblock circuit board.
Voltage signal amplifies through programmable amplifying circuit 230, and programmable amplifying circuit 230 comprises voltage amplifier and switch chip.Voltage amplifier can select Low-offset, ultra-low temperature drift, high-gain, high input impedance, high-precision chopper-zero-stabilized formula amplifier Op-07C, switch chip can select CD4051, CD4051 Ke You tri-road signal controls, eight tunnels export, so just, automatic switched voltage can be carried out by programming and amplify range with the needs of satisfied different occasion, by realizing the adjustment of voltage amplification and range to the selection of CD4051 analog switch channel.Eight groups of different resistance values are connected, to produce different enlargement factors to input signal by switch chip CD4051 in voltage amplifier Op-07C feedback resistance one end.Switch chip CD4051 adopts+12V to power, its inside by maximum current be 10mA, if for sample resistance R=1K, minimumly in eight groups of resistance should be 100 ohm, maximum resistance should be 12K ohm.Therefore, eight groups of resistances should between 100 Europe ~ 10K Europe.Can be controlled by the enlargement factor of programmed control analog switch to output voltage like this, and then the flimsy shortcoming of mechanical switch can be avoided.
Enter low-pass filter circuit 240 through the programmable amplifying circuit voltage signal carried out after voltage amplification, low-pass filter circuit 240 can select common single order RC wave filter, can filtering interference signals, clutter etc.
The electric signal collected arrives low-pass filter circuit 240 after treatment, the negative feedback circuit for rectifying 250 that the voltage signal exported forms through Differential Input and voltage follower, reduce the voltage signal input A/D change-over circuit 260 after error originated from input, A/D change-over circuit 260 can adopt AD7352, this chip is Differential Input, binary channels, 3MSPS, the ADC chip of 12 bit serial.Select the mode of differential input signal to correct input signal, reduce and even eliminate error originated from input, suppress common-mode signal, improve signal accuracy, improve the error interference of common mode.AD7352 built-in reference voltage, is connected with a voltage follower can forms negative-feedback circuit with one end of Differential Input, can correct error constantly simultaneously, improves precision.Its inner built-in 2.048V datum is connected with one end of Differential Input by a voltage follower, can be input end and provides an internal reference level, improves input precision.
FPGA data processing module, for processing the optical power signals gathered, and controls CD4051 analog switch channel.See the structural representation that Fig. 4, Fig. 4 are FPGA data processing module, comprise FPGA main control chip 271, USB interface 272, expansion module 273, ROM/SRAM274, RS-232275, clock 276.Optical power signals outputs to FPGA main control chip 271 through A/D change-over circuit and processes, and FPGA main control chip 271 is communicated with PC by USB interface after the data received being stored, and obtained data is shown on PC display interface through process.Program and process data also can be stored in ROM or SRAM memory, and FPGA data processing module carries out Function Extension by expansion module simultaneously.This data processing module reserves multiple communication interface, as shown in Figure 3, communication interface can comprise RS-232 and USB interface, by communication interface can with other such as bit error rate checkout equipments, plc communication equipment etc. use jointly, data processed result turns Serial Port Line by USB and shows on PC host computer, as shown in Figure 5, is also manipulated by this PC host computer interface display to data.PC host computer interface can the acquired results of display light power and error rate test, and the unit of acquired results can be exchanged, and can support the switching between Chinese and English simultaneously.The data of this display interface can arrange refreshing button and refresh, or automatically refresh, as 5 seconds can refresh a secondary data automatically.Serial ports selection key can also be set in addition, click serial ports selection key, different serial ports can be selected.
Power module, for powering to FPGA data processing module, power module input 220V alternating current, can export+12V ,-12V simultaneously, the voltage of+5V, in addition, two panels step-down chip LM1117-3.3 can also be selected, LM1117-2.5, produce+2.5V and+3.3V voltage, required various DC voltage are provided.
Luminous power test macro all adopts low-power chip, AD7352, CD4051 described above, fpga chip, select low-power chip can reduce the power consumption of whole circuit board, selected chip kind is chip comparatively cheap on market simultaneously, can reduce costs to a great extent.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
Finally, also it should be noted that, in this article, the relational terms of such as first, second, third and fourth etc. and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
For convenience of description, various unit is divided into describe respectively with function when describing above device.Certainly, the function of each unit can be realized in same or multiple software and/or hardware when implementing the application.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a luminous power test macro, is connected with optical fiber communication equipment by lightguide cable link, it is characterized in that, comprising:
For receiving the optical splitter of described optical fiber communication equipment light signal;
The light power meter be connected with described optical splitter, described light power meter comprises the photodetector, I/V translation circuit, programmable amplifying circuit, low-pass filter circuit, the negative feedback circuit for rectifying be made up of Differential Input and voltage follower, A/D change-over circuit, the on-site programmable gate array FPGA data processing module that connect successively, and to the power module that described FPGA data processing module is powered;
Described low-pass filter circuit adopts single order RC wave filter.
2. system according to claim 1, is characterized in that, described optical splitter is the optical splitter of 95:5.
3. system according to claim 1, is characterized in that, also comprises PC host computer.
4. system according to claim 1, is characterized in that, described FPGA data processing module comprises reserved multiple communication interfaces.
5. system according to claim 1, is characterized in that, described FPGA data processing module comprises static RAM SRAM and/or read-only memory ROM.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103616160A (en) * | 2013-11-27 | 2014-03-05 | 国家电网公司 | Optical fiber protecting channel on-line monitoring system |
| CN104677493B (en) * | 2015-03-24 | 2017-07-18 | 国家电网公司 | A kind of luminous power real-time monitoring device |
| CN106052859B (en) * | 2016-05-18 | 2017-11-17 | 中国电子科技集团公司第四十一研究所 | A kind of method that multrirange thermoelectric pile laser power meter realizes same zero point power |
| CN105894928A (en) * | 2016-06-24 | 2016-08-24 | 桂林创研科技有限公司 | Extendable high-precision digital optical power meter |
| CN107328473A (en) * | 2017-07-01 | 2017-11-07 | 北京石油化工学院 | A kind of Electro-Optical Sensor Set |
| CN108132097A (en) * | 2017-12-18 | 2018-06-08 | 北京泊菲莱科技有限公司 | A kind of detector probe, light power meter and optical power measurement method |
| CN111766048B (en) * | 2020-07-28 | 2022-04-22 | 深圳先进技术研究院 | Automatic grating diffraction angle spectrum measuring system |
| CN113418602A (en) * | 2021-08-23 | 2021-09-21 | 深圳市力子光电科技有限公司 | Optical power meter circuit and optical power meter |
| CN118550355B (en) * | 2024-07-30 | 2024-10-18 | 光本位科技(上海)有限公司 | Method and system for adjusting link resolution in photoelectric hybrid computing system and storage medium |
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