CN202334523U - Multifunctional optical time-domain reflectometer (OTDR) based on embedded system - Google Patents
Multifunctional optical time-domain reflectometer (OTDR) based on embedded system Download PDFInfo
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- CN202334523U CN202334523U CN2011204681013U CN201120468101U CN202334523U CN 202334523 U CN202334523 U CN 202334523U CN 2011204681013 U CN2011204681013 U CN 2011204681013U CN 201120468101 U CN201120468101 U CN 201120468101U CN 202334523 U CN202334523 U CN 202334523U
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Abstract
The utility model relates to a multifunctional optical time-domain reflectometer (OTDR) based on an embedded system. The multifunctional OTDR is characterized by comprising an FPGA (Field Programmable Gate Array) sampling mainboard, a VLS (Vertical Launching System) module, an optical power meter module, an end face detection module, a liquid crystal screen display module, a keystroke module, an ARM11 embedded mainboard and a peripheral interface circuit; the ARM11 embedded mainboard is connected with the FPGA sampling mainboard, the VLS module, the optical power meter module, the end face detection module, the liquid crystal screen display module, the keystroke module and the peripheral interface circuit; and various modules are powered by a power supply management circuit. The multifunctional OTDR disclosed by the utility model has the benefits that: aiming at the problems of the current import and domestic OTDRs, with the help of the practical service condition, the multifunctional OTDR which has the advantages of being convenient for control, small in volume and convenient for carrying is provided.
Description
Technical field
The utility model relates to a kind of instrument that the time domain of light is analyzed, and relates in particular to the circuit module of this instrument.
Background technology
Fibre Optical Communication Technology (optical fiber communications) is shown one's talent from optical communication, has become one of main pillar of modern communications, plays a part very important in modern times in the telecommunications network.Optical fiber communication is as an emerging technology, fast, the application surface of its development in recent years speed extensively be that communication is rarely seen in history, also be the main means of transportation of various information in important symbol and the following information-intensive society of new worldwide technological revolution.
Optical fiber is as the transmission medium of light in the optical communication at present, and the physical characteristic of optical fiber: fragility, rapid wear, easily broken, therefore the installation and maintenance to optical fiber is very important thing.The transmission means of light in optical fiber is to transmit forward with the mode of total reflection; Getting into from a kind of medium with the time can be in critical surface generation reflection of light and refraction the another kind of medium; Partial reflection light is because reflection angle is bigger, makes the transmission direction of light change fully and along original opposite direction transmission.Therefore, the performance that usually can come each point of measuring optical fiber according to its reverberation principle, Here it is popular in the market optical time-domain analyzer.
The domestic market is main with the optical time-domain analyzer of import at present, but the costliness of its price makes a lot of users hang back.More domestic research institutes and some enterprises have also released the optical time-domain analyzer of oneself; But its measurement index is difficult to a follow-up mouthful instrument to be compared; Fairly simple occasion is all right for measuring, but really relates to measurement requirement than higher occasion, and homemade instrument but can only make way for the import instrument.In addition, the function of import at present and homemade instrument is all more single, all can only be with a red light source at most as OTDR (optical time-domain analyzer) usefulness basically.For needs inspection optical connector end face, measuring light power is measured the occasion that turns back to indexs such as damage and just need be utilized other relevant instrument to measure in addition
In addition, the index of at present domestic OTDR also lags far behind the import instrument, and the blind area is generally all greater than 10 meters, and the import instrument is generally all about 5 meters.Measuring distance all is no more than 100 kilometers basically, and if to measure remote the time saturation region of front end very big, that is to say that actual dynamic range is not reach requirement far away.
Therefore, improving the performance of domestic existing optical time-domain analyzer, is the problem that the technical staff will solve.
Summary of the invention
The utility model technical issues that need to address have provided a kind of multifunctional light time-domain reflectomer based on embedded system, are intended to solve the above problems.
In order to solve the problems of the technologies described above, the utility model is realized through following technical scheme:
The utility model comprises: FPGA sampling mainboard, VLS (visual red laser light source) module, light power meter module, end face detection module, liquid crystal display screen display module, key-press module, ARM11 embedded main board and peripheral interface circuit; Sample mainboard, VLS module, light power meter module, end face detection module, liquid crystal display screen display module, button module, peripheral interface circuit of ARM11 embedded main board and FPGA links to each other; Electric power management circuit provides power supply for above-mentioned each module.
The beneficial effect of the utility model is: in order to solve the situation that the workmen need carry multilist, this instrument has also loaded the light power meter module, satisfies the measurement to luminous power; Also carry the red light source module, can use as red light source; Also have return loss appearance module, can help the measurement of user return loss; This instrument can also add the end face detector, to satisfy the detection of user to end face; This instrument adopts WINDOWS CE6.0 operating system, makes that operation is more simple and clear, hommization more, and its processing speed is more quick, and software upgrading is convenient.
Description of drawings
Fig. 1 is the utility model overall structure block diagram;
Fig. 2 is the work sketch map of the utility model FPGA sampling mainboard.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
Visible by Fig. 1: the utility model comprises: FPGA sampling mainboard, VLS (visual red laser light source) module, light power meter module, end face detection module, liquid crystal display screen display module, key-press module, ARM11 embedded main board and peripheral interface circuit; Sample mainboard, VLS module, light power meter module, end face detection module, liquid crystal display screen display module, button module, peripheral interface circuit of ARM11 embedded main board and FPGA links to each other; Electric power management circuit provides power supply for above-mentioned each module.
The ARM11 embedded main board is equipped with WINDOW CE6.0 operating system, accomplishes man-machine exchange and data processing work, and FPGA sampling mainboard is responsible for the data acquisition of OTDR function, and the transfer of data that samples is processed to ARM11, and the result is shown.Light power meter module measuring light power, and measurement result is transferred to ARM11, accomplish the processing and the demonstration of data.Because ARM11 also links to each other with VLS red light source module, controls the operating state of its red light source.The end face detection module detects picture with end face and directly flows to ARM11, through LCD pictures.
VLS module, light power meter module, end face detection module, liquid crystal display screen module, button module and ARM11 embedded main board that the utility model adopts are prior art products.
By ARM11 (Samsung S3C6410) is the embedded main board of core; Embedded main board is used to accomplish man-machine exchange and data processing.FPGA sampling mainboard is accomplished the high-speed sampling after light signal changes into the signal of telecommunication, and accomplishes the control of laser and the auto-control of signal amplification circuit.
ARM11 communicates by letter with FPGA (Altera EP4CE6F17I8N), reads the data that FPGA samples, and ARM11 carries out the data that read to be presented on 7 cun liquid crystal display screens after the corresponding computing and with result's (result of calculation and curve) through parameter is set.ARM11 also links to each other with the light power meter module, and the luminous power parameter that the light power meter module is measured is shown on the liquid crystal display screen.ARM11 also links to each other with VLS (visual red laser module), can control the VLS module and send visible red, makes things convenient for the user to measure.ARM11 also links to each other with the end face detector through USB, and the detection picture of end face detector is shown on the liquid crystal display screen.
Visible by Fig. 2: FPGA sampling mainboard comprises: FPGA, 1310nm/1550nm pulsed laser, laser control circuit, DAC (digital-to-analogue conversion) chip, temperature sensor, APD (avalanche diode) photoelectric tube, high-frequency clock, ADC (analog-to-digital conversion) chip, mirror current source;
Described FPGA links to each other with the ARM11 embedded main board, receives the order that ARM11 sends, and does corresponding setting and measurement according to order; FPGA links to each other with the DAC chip, the first via of control DAC chip, the second tunnel and Third Road output, and the first via output of DAC chip links to each other with laser control circuit, is used for controlling the transmitted power of 1310nm/1550nm pulsed laser; The second tunnel of DAC chip passes through first operational amplifier and links to each other with first amplifier, is used for controlling the first order common mode line of amplifying circuit; The Third Road of DAC chip links to each other with second amplifier through second operational amplifier, is used for controlling the second level common mode line of amplifying circuit; FPGA also links to each other with the 1310/1550nm drive circuit for laser through laser control circuit, is used for the pulse output of controlling organization device; FPGA also links to each other with temperature sensor, is used for the real-time monitoring circuit plate temperature, and according to temperature, FPGA does corresponding adjustment to common mode line, makes common mode line be on the best horizontal line; FPGA also links to each other with high-frequency clock, guarantees the sequential of sampling, makes sampling accurately quick more; FPGA also links to each other with ADC (analog-to-digital conversion) chip, is used to read sampled signal; The APD photoelectric tube receives that the mode with the signal of telecommunication flows to first order amplifier behind the light signal; Give first order image current source circuit with the signal conveys after amplifying; The output signal conveys of first order image current source circuit is given second level amplifier; Flow to second level image current source circuit after handling; The output signal conveys of second level image current source circuit is given third level amplifier, and the defeated signal of third level amplifier is connected to differential amplifier, differential amplifier with signal change into differential signal to after be connected to the ADC chip and do the AD sampling.
The mode that LD dual laser and drive circuit thereof, laser have adopted negative supply to drive is utilized the free switched laser device of relay wavelength, the power output of DA adjustment laser; The 400M dominant frequency that FPGA adopts, the ADC inversion frequency has reached 65M, makes sampling precision higher, and rate is better respectively.In order to improve the sensitivity of measurement, photoelectric receiving tube has adopted APD, adds the 60V bias voltage; Frontend amplifying circuit adopts the stepping formula, selects best measurement setting according to the characteristic of measuring light path, has also added the frequency response circuit in the circuit; To eliminate the frequency resonance of circuit; In order to improve signal to noise ratio, adopted the conversion of voltage signal in the circuit, then again by the conversion (being the image current source circuit) of current signal to voltage signal to current signal.
The APD photoelectric switching circuit; APD is used for light signal is changed into the signal of telecommunication.Frontend amplifying circuit: frontend amplifying circuit is used for the small-signal after the opto-electronic conversion is carried out denoising and processing and amplifying, and the signal after will handling then sends the difference amplifier to, and the difference amplifier changes into differential signal with signal.ADC transducer: ADC changes into device and is used for the differential signal of difference amplifier output is changed into digital signal corresponding (promptly accomplishing modulus changes into).
The utility model comprises automatic control circuit, and control comprises the power output control of laser, the auto-control of common mode electrical level automatically.The power output auto-control of laser is in order to satisfy different test environment in the test, and different measuring distances utilizes different luminous powers to measure, and is dynamic to reach bigger measurement.The auto-control of common mode electrical level is because along with the variation of the different gains of variation of temperature and frontend amplifying circuit, its common mode electrical level also can change accordingly; And the variation of common mode electrical level makes the differential signal of difference amplifier output to also can changing, thereby influences the measuring range of ADC chip, and the auto-control of common mode electrical level just just in time can solve this problem; Method is: utilize level of DAC output; Give operational amplifier then, the signal after amplifying is exported to the negative input end of signal amplifier, to reach the effect of regulation and control common mode electrical level; F PGA sampling mainboard also comprises 1310nm and two pulsed lasers of 1550nm (LD), is used to send pulse signal.
Said FPGA also links to each other with 100M high-precision high-speed clock, guarantees the correctness of measuring distance.
Said F PGA also links to each other with temperature sensor, is used for monitoring in real time built-in temperature, and ARM11 reads temperature value through FPGA; ARM11 is according to the temperature value of reading; Test parameter is done corresponding adjustment, make that test is more accurate, ARM11 one can judge partial fault according to temperature value; And protect and send failure warning, cut off the electricity supply automatically when serious.
The utility model provides a kind of convenience, volume multi-functional optical time-domain analyzer little, easy to carry controlled to the not enough existing problem of existing import and homemade OTDR ins conjunction with situation about using in the reality.
More than show and described basic principle of the utility model and the advantage of principal character and the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the specification that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all implement in the utility model scope that requires protection.The utility model requires protection range to be defined by appending claims and equivalent thereof.
Claims (3)
1. the multifunctional light time-domain reflectomer based on embedded system is characterized in that comprising: FPGA sampling mainboard, VLS module, light power meter module, end face detection module, liquid crystal display screen display module, key-press module, ARM11 embedded main board and peripheral interface circuit; Sample mainboard, VLS module, light power meter module, end face detection module, liquid crystal display screen display module, button module, peripheral interface circuit of ARM11 embedded main board and FPGA links to each other; Electric power management circuit provides power supply for above-mentioned each module.
2. the multifunctional light time-domain reflectomer based on embedded system according to claim 1 is characterized in that: described FPGA sampling mainboard comprises: FPGA, 1310nm/1550nm pulsed laser, laser control circuit, DAC chip, temperature sensor, APD photoelectric tube, high-frequency clock, ADC chip, mirror current source;
Described FPGA links to each other with the ARM11 embedded main board; FPGA links to each other with the DAC chip, the first via of control DAC chip, the second tunnel and Third Road output; The first via output of DAC chip links to each other with laser control circuit, is used for controlling the transmitted power of 1310nm/1550nm pulsed laser; The second tunnel of DAC chip passes through first operational amplifier and links to each other with first amplifier, is used for controlling the first order common mode line of amplifying circuit; The Third Road of DAC chip links to each other with second amplifier through second operational amplifier, is used for controlling the second level common mode line of amplifying circuit; FPGA also links to each other with the 1310/1550nm drive circuit for laser through laser control circuit, is used for the pulse output of controlling organization device; FPGA also links to each other with temperature sensor, is used for the real-time monitoring circuit plate temperature, and according to temperature, FPGA does corresponding adjustment to common mode line, makes common mode line be on the best horizontal line; FPGA also links to each other with high-frequency clock, guarantees the sequential of sampling, makes sampling accurately quick more; FPGA also links to each other with the ADC chip, is used to read sampled signal; The APD photoelectric tube receives that the mode with the signal of telecommunication flows to first order amplifier behind the light signal; Give first order image current source circuit with the signal conveys after amplifying; The output signal conveys of first order image current source circuit is given second level amplifier; Flow to second level image current source circuit after handling; The output signal conveys of second level image current source circuit is given third level amplifier, and the defeated signal of third level amplifier is connected to differential amplifier, differential amplifier with signal change into differential signal to after be connected to the ADC chip and do the AD sampling.
3. the multifunctional light time-domain reflectomer based on embedded system according to claim 2 is characterized in that: described high-frequency clock is the 100M high-frequency clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204681013U CN202334523U (en) | 2011-11-21 | 2011-11-21 | Multifunctional optical time-domain reflectometer (OTDR) based on embedded system |
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| CN2011204681013U CN202334523U (en) | 2011-11-21 | 2011-11-21 | Multifunctional optical time-domain reflectometer (OTDR) based on embedded system |
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| CN202334523U true CN202334523U (en) | 2012-07-11 |
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| CN2011204681013U Withdrawn - After Issue CN202334523U (en) | 2011-11-21 | 2011-11-21 | Multifunctional optical time-domain reflectometer (OTDR) based on embedded system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124193B (en) * | 2011-11-21 | 2015-11-18 | 上海光家仪器仪表有限公司 | Based on the multifunctional light time-domain reflectomer of embedded system |
| CN105323001A (en) * | 2015-11-26 | 2016-02-10 | 武汉光迅科技股份有限公司 | OTDR optical signal receiving circuit |
| CN110702239A (en) * | 2019-10-28 | 2020-01-17 | 电子科技大学 | Infinite scattering single photon detection optical time domain reflection measurement method |
-
2011
- 2011-11-21 CN CN2011204681013U patent/CN202334523U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124193B (en) * | 2011-11-21 | 2015-11-18 | 上海光家仪器仪表有限公司 | Based on the multifunctional light time-domain reflectomer of embedded system |
| CN105323001A (en) * | 2015-11-26 | 2016-02-10 | 武汉光迅科技股份有限公司 | OTDR optical signal receiving circuit |
| CN105323001B (en) * | 2015-11-26 | 2019-07-02 | 武汉光迅科技股份有限公司 | A kind of OTDR optical signal receiving circuit |
| CN110702239A (en) * | 2019-10-28 | 2020-01-17 | 电子科技大学 | Infinite scattering single photon detection optical time domain reflection measurement method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120711 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |