CN103323106A - Light power testing system - Google Patents
Light power testing system Download PDFInfo
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- CN103323106A CN103323106A CN2013102315618A CN201310231561A CN103323106A CN 103323106 A CN103323106 A CN 103323106A CN 2013102315618 A CN2013102315618 A CN 2013102315618A CN 201310231561 A CN201310231561 A CN 201310231561A CN 103323106 A CN103323106 A CN 103323106A
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Abstract
The invention provides a light power testing system which is connected with optical fiber communication equipment through an optical cable line. The light power testing system comprises an optical splitter and a light power meter, wherein the optical splitter is used for receiving optical signals of the optical fiber communication equipment, and the light power meter is connected with the optical splitter. The light power meter comprises a photoelectric detector, an I/V converting circuit, a program-control amplifying circuit, a lowpass filtering circuit, a negative feedback correction circuit, an A/D converting circuit, an FPGA data processing module and a power source module which are sequentially connected, the negative feedback correction circuit is composed of a differential input device and a voltage follower, and the power source module supplies power to the FPGA data processing module. The collected optical signals are transmitted to the lowpass filtering circuit after being processed, output voltage signals pass through the negative feedback correction circuit composed of the differential input device and the voltage follower, accurate input can be carried out on the collected and amplified signals in real time, input errors can be greatly reduced, and the measurement accuracy of the optical signals is improved.
Description
Technical field
The present invention relates to the luminous power field tests, relate in particular a kind of luminous power test macro.
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 just better, and for a definite receiver, signal to noise ratio (S/N ratio) is relevant with signal light power, larger such as signal light power, signal to noise ratio (S/N ratio) is also just higher, therefore, and can be the mass parameter of the signal light power in the optical-fibre communications as communication, that is to say, can reach by the signal light power in the measuring fiber communication purpose of check optical-fibre communications signal quality.
Along with the development of Fibre Optical Communication Technology and the progress of China's national grid and electric generating station system, the 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 can only be applied in the lower situation of light signal accuracy requirement usually because measuring accuracy is on the low side.
Summary of the invention
The purpose of the embodiment of the 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, comprising:
Be used for receiving the optical splitter of described optical fiber communication equipment light signal;
The light power meter that is connected with described optical splitter, negative feedback circuit for rectifying, A/D change-over circuit, on-site programmable gate array FPGA data processing module that described light power meter comprises successively the photodetector that connects, I/V translation circuit, programmable amplifying circuit, low-pass filter circuit, is comprised of difference input and voltage follower, and the power module of powering to described FPGA data processing module.
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, also comprise the PC host computer.
Preferably, in above-mentioned luminous power test macro, described FPGA data processing module comprises a plurality of communication interfaces of reservation.
Preferably, in above-mentioned luminous power test macro, described FPGA data processing module comprises static RAM SRAM and/or read-only memory ROM.
Have following beneficial effect in the technique scheme:
The light signal that collects arrives low-pass filter circuit after treatment, the voltage signal of output is through the negative feedback circuit for rectifying of difference input and voltage follower composition, can be in real time to gather and amplifying signal is inputted accurately, reduce widely error originated from input, improved the measuring accuracy of light signal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
A kind of structural representation of the luminous power test macro that Fig. 1 provides for the embodiment of the invention;
A part of electrical block diagram of the luminous power test macro that Fig. 2 provides for the embodiment of the 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 invention;
The structural representation of the FPGA data processing module that Fig. 4 provides for the embodiment of the invention;
Another structural representation of the luminous power test macro that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Referring to Fig. 1, the embodiment of the invention provides a kind of luminous power test macro, is connected with optical fiber communication equipment by lightguide cable link, and the luminous power test macro comprises:
Be used for receiving the optical splitter 100 of optical fiber communication equipment light signal;
The light power meter 200 that is connected with optical splitter, negative feedback circuit for rectifying 250, A/D change-over circuit 260, FPGA(Field-Programmable Gate Array that light power meter 200 comprises successively the photodetector 210 that connects, I/V translation circuit 220, programmable amplifying circuit 230, low-pass filter circuit 240, is comprised of difference input and voltage follower, be field programmable gate array) data processing module 270, and to the power module 280 of FPGA data processing module power supply.
The electric signal that collects arrives low-pass filter circuit 240 after treatment, the voltage signal of output is through the negative feedback circuit for rectifying 250 of difference input and voltage follower composition, negative feedback circuit for rectifying 250 can be in real time to gather and amplifying signal is inputted accurately, reduce widely error originated from input, improve the measuring accuracy of light signal.
The light signal that the optical fiber communication equipment generator sends transmits by lightguide cable link, optical splitter receives the light signal that optical fiber communication equipment sends, for quality that can better the detected transmission light signal, reduce the impact on optical-fibre communications, can select the optical splitter of 95:5, select less splitting ratio, namely 5% light signal enters photodetector.By there being 5% light signal to enter photodetector behind the 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.
Referring to Fig. 2-3, show a kind of circuit diagram of luminous power test macro, wherein, be designated the connection that is designated B among the circuit of A and Fig. 3 among Fig. 2.Photodetector 210 can be selected InGaAs series GT322D type.The optical responsivity of this photodetector is more than or equal to 0.85A/W, maximum forward current value is 10mA, has a noise low, and frequency of operation is high, spectral response curve is steady, the characteristics 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 output, can well satisfy the measurement needs of signal on relative broad range, the error when reducing the conversion of noise and signal guarantees measuring accuracy.The light (5%) that enters light power meter can produce magnitude after by above-mentioned photodetector and reach other electric current of mA level in the normal situation of illumination, maximum can reach 10mA, by the I/V translation circuit 220 that is connected with photodetector, can become voltage signal to export the current conversion of photodetector output.The 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 satisfy like this electric current to the conversion of voltage, 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 be selected Low-offset, ultra-low temperature drift, high-gain, high input impedance, high-precision chopper-zero-stabilized formula amplifier Op-07C, switch chip can be selected CD4051, CD4051 can have three tunnel signal controlling, eight tunnel outputs, so just, can come automatic switched voltage to amplify range to satisfy the needs of different occasions by programming, realize the adjusting of voltage amplification and range by the selection to CD4051 analog switch channel.Connect eight groups of different resistance values at voltage amplifier Op-07C feedback resistance one end by switch chip CD4051, so that input signal is produced different enlargement factors.Switch chip CD4051 employing+12V power supply, the maximum current that its inside can be passed through is 10mA, if take sample resistance R=1K as example, minimum should be 100 ohm in eight groups of resistance, maximum resistance should be 12K ohm.Therefore, eight groups of resistances should be between 100 Europe～10K Europe.Can control the enlargement factor of output voltage by the programmed control analog switch like this, and then can avoid the flimsy shortcoming of mechanical switch.
The voltage signal that the process programmable amplifying circuit carries out after the voltage amplification enters low-pass filter circuit 240, and low-pass filter circuit 240 can be selected common single order RC wave filter, energy filtering interference signals, clutter etc.
The electric signal that collects arrives low-pass filter circuit 240 after treatment, the voltage signal of output is through the negative feedback circuit for rectifying 250 of difference input and voltage follower composition, voltage signal input A/D change-over circuit 260 behind the reduction error originated from input, A/D change-over circuit 260 can adopt AD7352, this chip is the difference input, binary channels, 3MSPS, the ADC chip of 12 bit serial.Select the mode of differential input signal can correct input signal, reduce even the elimination error originated from input, suppress common-mode signal, improve signal accuracy, improve the error interference of common mode.The built-in reference voltage of AD7352 simultaneously, an end of inputting with a voltage follower and difference is connected and can consists of negative-feedback circuit, can correct constantly error, the raising precision.Its inner built-in 2.048V datum is connected by the end of a voltage follower with the difference input, can be input end an internal reference level is provided, and improves input precision.
The FPGA data processing module is used for the optical power signals that gathers is processed, and CD4051 analog switch channel is controlled.Referring to Fig. 4, Fig. 4 is the structural representation of FPGA data processing module, comprises 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 the A/D change-over circuit and processes, and FPGA main control chip 271 communicates by USB interface and PC after the data that receive are stored, and resulting data are shown at the PC display interface through processing.Program and deal with data also can be stored in ROM or the SRAM storer, and the FPGA data processing module can carry out Function Extension by expansion module simultaneously.This data processing module is reserved a plurality of communication interfaces, 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 equipment, plc communication equipment etc. are common to be used, data processed result can turn Serial Port Line by USB and show at the PC host computer, as shown in Figure 5, also by this PC host computer interface the demonstration of data is controlled.But the acquired results of PC host computer interface display light power and error rate test, and the unit of acquired results can be exchanged, the switching between the Chinese and English can be supported simultaneously.The data of this display interface can arrange and refresh button and refresh, and perhaps automatically refresh, and can automatically refresh a secondary data such as 5 seconds.In addition the serial ports selection key can also be set, click the serial ports selection key, can select different serial ports.
Power module, be used for powering to the FPGA data processing module, power module input 220V alternating current can be exported+12V-12V simultaneously, the voltage of+5V, in addition, can also select two step-down chip LM1117-3.3, LM1117-2.5, generation+2.5V and+3.3V voltage, needed various DC voltage is provided.
The luminous power test macro all adopts low-power chip, AD7352 described above, CD4051, fpga chip, select low-power chip can reduce the power consumption of whole circuit board, selected chip kind is chip comparatively cheap on the market simultaneously, can reduce to a great extent cost.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
At last, also need to prove, in this article, such as first, second, third and the fourth class relational terms only be used for an entity or operation are separated with another entity or operational zone, and not necessarily require or hint and have the relation of any this reality or sequentially between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
For the convenience of describing, be divided into various unit with function when describing above device and describe respectively.Certainly, when implementing the application, can in same or a plurality of softwares and/or hardware, realize the function of each unit.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment 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:
Be used for receiving the optical splitter of described optical fiber communication equipment light signal;
The light power meter that is connected with described optical splitter, negative feedback circuit for rectifying, A/D change-over circuit, on-site programmable gate array FPGA data processing module that described light power meter comprises successively the photodetector that connects, I/V translation circuit, programmable amplifying circuit, low-pass filter circuit, is comprised of difference input and voltage follower, and the power module of powering to described FPGA data processing module.
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 the PC host computer.
4. system according to claim 1 is characterized in that, described FPGA data processing module comprises a plurality of communication interfaces of reservation.
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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| CN201310231561.8A CN103323106B (en) | 2013-06-09 | 2013-06-09 | A kind of luminous power test macro |
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| CN201310231561.8A CN103323106B (en) | 2013-06-09 | 2013-06-09 | A kind of luminous power test macro |
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| CN103323106B CN103323106B (en) | 2015-11-18 |
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Cited By (9)
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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 |
| CN104677493A (en) * | 2015-03-24 | 2015-06-03 | 国家电网公司 | Luminous power real-time monitoring device |
| 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 |
| CN106052859A (en) * | 2016-05-18 | 2016-10-26 | 中国电子科技集团公司第四十研究所 | Method for multi-range thermopile laser power meter to obtain identical zero power |
| 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 |
| CN111766048A (en) * | 2020-07-28 | 2020-10-13 | 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 |
| CN118550355A (en) * | 2024-07-30 | 2024-08-27 | 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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| 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 |
| CN111766048A (en) * | 2020-07-28 | 2020-10-13 | 深圳先进技术研究院 | Automatic grating diffraction angle spectrum measuring system |
| 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 |
| CN118550355A (en) * | 2024-07-30 | 2024-08-27 | 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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