CN101834666A - Device and method for testing burst optical power of optical network unit - Google Patents
Device and method for testing burst optical power of optical network unit Download PDFInfo
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- CN101834666A CN101834666A CN 201010165562 CN201010165562A CN101834666A CN 101834666 A CN101834666 A CN 101834666A CN 201010165562 CN201010165562 CN 201010165562 CN 201010165562 A CN201010165562 A CN 201010165562A CN 101834666 A CN101834666 A CN 101834666A
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Abstract
The invention discloses a device and a method for testing the burst optical power of an optical network unit. When the burst transmitted by a system is effective, on one hand, the optical network unit is used for controlling a laser to emit light, a photodiode in the laser outputs optical current in direct proportion to the output burst optical power of a laser diode to a preamplifier to convert the optical current into a voltage signal, and the voltage signal is output to an analog-digital converter of a microcontroller through a sampling maintaining circuit of the microcontroller; on the other hand, an external pin of the microcontroller is triggered to be interrupted to enter an external pin interruption service flow, a control module and the analog-digital converter are controlled in the interruption service flow so as to finish the sampling of the burst optical power; and when timing time is up, timing interruption is triggered to enter a timing interruption service flow so as to finish the calculation of the burst optical power. By adopting the technical scheme of the invention, accurate burst optical power values can be obtained, the cost is reduced, and the reliability of the optical network unit is improved.
Description
Technical field
The present invention relates to the optical communication technique field, relate in particular to a kind of apparatus and method of testing burst optical power of optical network unit.
Background technology
EPON (PON-Passive Optical Network) is owing to the active equipment of having eliminated between telecommunications local side and the user side, thereby make that maintenance is simple, reliability is high, cost is low, become that Fiber to the home (FTTH-Fiber To The Home), the main solution of Fiber-To-The-Building (FTTB-Fiber To The Building) and service such as Fiber To The Curb (FTTC-Fiber To The Curb).
In the EPON that has adopted time division multiple access (TDMA-Time Division Multiple Access) technology, the optical network unit of user side must send data to the optical line terminal (OLT-Optical Line Terminal) of local side in the mode of burst in the time slot of regulation, for the ease of network operation, optical network unit need report its transmitting optical power, and this just requires optical network unit must have the function of burst luminous power test.
Fig. 1 is the structural representation of the device of testing burst optical power of optical network unit in the prior art.As shown in Figure 1, the principle of the device of testing burst optical power of optical network unit is that when the enable signal that externally happens suddenly was effective, the switch of sampling hold circuit was switched on, and reflected that the voltage of burst optical power of optical network unit is stored on the electric capacity of sampling hold circuit; On the other hand, the burst enable signal starts analog-digital converter (ADC-Analog to Digital Converter) through the time-delay back, the output voltage of sampling previous stage sampling hold circuit; Calculate the burst luminous power of optical network unit the last time at last by data processing unit.(as HGEPON (Gigabit Ethernet Passive OpticalNetwork) was 810 nanoseconds because the minimum time slot of agreement regulation is very short, GPON (Gigabit-Capable Passive Optical Network) was 410 nanoseconds), this just requires this device that the sampling hold circuit switch of a high speed and the analog-digital converter of a high speed must be arranged.For example in the technical scheme of Fig. 1, if having only two optical network units alternately luminous with the blanking time of 500 nanoseconds, the sample rate that then requires analog-digital converter is [1/ (500 * 10
-9)]=2MSPS, and the sample rate that is integrated in the inner analog-digital converter of microcontroller (MCU-MiCro Controller Unit) usually has only tens KSPS to hundreds of KSPS, uses the external analog digital quantizer can increase the complexity of cost, volume and circuit again greatly.
If still adopt this scheme, do not use analog-digital converter spare at a high speed again, then must use the method for asynchronous-sampling, the time that promptly starts the time discord sampling hold circuit switch closure of analog-digital converter is consistent, the sampled value of gained can be because the capacitor discharge effect in the sampling hold circuit makes sampled value inaccurate, so said apparatus is requiring small size, realizing it being worthless in the optical network unit cheaply so.
Summary of the invention
The objective of the invention is to propose a kind of apparatus and method of testing burst optical power of optical network unit, can obtain the optical power value that happens suddenly accurately, reduce cost, improve the reliability of optical network unit.
For reaching this purpose, the present invention by the following technical solutions:
A kind of device of testing burst optical power of optical network unit, comprise laser, preamplifier and microcontroller, described laser further comprises laser diode and photodiode, described microcontroller comprises that further external terminal interrupts, control module, sampling hold circuit, analog-digital converter, data processing unit and timer, described photodiode is connected with described preamplifier, the photoelectric current that is used to export the output burst luminous power that is proportional to described laser diode is given described preamplifier, described preamplifier links to each other with described sampling hold circuit, be used for converting the input photoelectric current to be directly proportional output voltage and give described sampling hold circuit, described external terminal interrupts being connected with described control module, be used to obtain outside burst enable signal and start described control module, described control module is connected with described analog-digital converter with described sampling hold circuit respectively, be used for starting and stopping described sampling hold circuit and described analog-digital converter, finish voltage sample to described preamplifier output, described sampling hold circuit is connected with described analog-digital converter with described control module, be used to keep the output voltage of described preamplifier, described analog-digital converter and described sampling hold circuit, described control module is connected with described data processing unit, be used for that the sustaining voltage that described sampling hold circuit is exported is converted to corresponding data and send the data processing processing unit, described timer is connected with described data processing processing unit, be used for regularly log-on data processing unit, described data processing unit is connected with timer with described analog-digital converter, be used for the data of described analog-digital converter output are handled, calculate the value of burst luminous power.
A kind of method of testing burst optical power of optical network unit may further comprise the steps:
A, when outside burst enables when effective, optical network unit control laser is luminous, the photodiode output in the laser is proportional to the photoelectric current of the burst luminous power of laser diode and gives preamplifier;
B, preamplifier will be proportional to the voltage signal of burst luminous power and export to the analog-digital converter of microcontroller by the sampling hold circuit of microcontroller;
The input pin that the external terminal of C, microcontroller interrupts connects outside burst enable signal, when outside burst enable signal is effective, the external terminal that triggers microcontroller interrupts, enter external terminal break in service flow process, the start-up control device is finished the sampling of burst luminous power, and the timing of setting when timer arrives, and triggers regularly and interrupts, enter regularly break in service flow process, finish the calculating of burst luminous power.
Among the step C, external terminal break in service flow process further may further comprise the steps:
The external terminal of forbidding microcontroller interrupts;
The start-up control device, thus sampling hold circuit and analog-digital converter started, the voltage signal that is proportional to the burst luminous power of preamplifier output is sampled and converted data to give data processing unit processing preservation;
Again the external terminal that enables microcontroller interrupts, and enables the break in service flow process from burst and returns.
Among the step C, regularly the break in service flow process further may further comprise the steps:
The external terminal of forbidding microcontroller interrupts;
The log-on data processing unit reads the numerical value that analog digital converting unit is preserved, and calculates the burst luminous power according to the analog-digital converter data converted of preserving, and the burst optical power value that will calculate preservation, reads for system;
Again the external terminal that enables microcontroller interrupts, and returns from timing break in service flow process.
Wherein, timing is 50 milliseconds.
Adopted technical scheme of the present invention, can access the optical power value that happens suddenly accurately, avoid using high speed device, reduced cost, greatly reduce the complexity of hardware, improve the reliability of optical network unit, and saved the space, helped other device layout and wiring in the optical network unit.
Description of drawings
Fig. 1 is the structural representation of the device of testing burst optical power of optical network unit in the prior art.
Fig. 2 is the structural representation of the device of testing burst optical power of optical network unit in the specific embodiment of the invention.
Fig. 3 is that burst enables the break in service flow chart in the specific embodiment of the invention.
Fig. 4 is a timing break in service flow chart in the specific embodiment of the invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Major technique thought of the present invention is based on present most microprocessor (MCU) all integrated sampling hold circuit and analog-to-digital conversion circuit in inside, and price also lower (model such as Atmel company is the AVR single-chip microcomputer of ATMega88), so directly deliver to the sampling hold circuit of microcontroller inside through the voltage signal that is proportional to the laser Output optical power of pre-amplification circuit output, and then deliver to analog-to-digital conversion circuit, so just saved outside sampling hold circuit switch and analog-to-digital conversion circuit.
In addition, the burst enable signal is not directly controlled the switch of sampling hold circuit, also directly do not control the startup of analog-to-digital conversion circuit, but receive the external interrupt input pin of microcontroller, like this when the burst enable signal is effective, microcontroller can enter the break in service flow process immediately, realizes the luminous power sampling then in software.
Fig. 2 is the structural representation of the device of testing burst optical power of optical network unit in the specific embodiment of the invention.Add shown in Figure 2, the device of testing burst optical power of optical network unit comprises laser, preamplifier and microcontroller, laser further comprises laser diode and photodiode, and microcontroller further comprises external terminal interruption, control module, sampling hold circuit, analog-digital converter, data processing unit and timer.
Photodiode is connected with preamplifier, output is proportional to the photoelectric current of the output burst luminous power of laser diode and gives preamplifier, preamplifier links to each other with sampling hold circuit, converts the input photoelectric current to be directly proportional output voltage and gives sampling hold circuit.
External terminal interrupts being connected with control module, obtain outside burst enable signal start-up control module, control module is connected with analog-digital converter with sampling hold circuit respectively, start and stop sampling hold circuit and analog-digital converter, finish voltage sample to preamplifier output, sampling hold circuit is connected with analog-digital converter with control module, the output voltage that keeps preamplifier, analog-digital converter and sampling hold circuit, control module is connected with data processing unit, the sustaining voltage of sampling hold circuit output is converted to corresponding data send the data processing processing unit, timer is connected with the data processing processing unit, timing log-on data processing unit, data processing unit is connected with timer with analog-digital converter, the data of analog-digital converter output are handled, calculated the value of burst luminous power.
The method of testing burst optical power of optical network unit is described below.
At first, when outside burst enables when effective, optical network unit control laser is luminous, and the photodiode output in the laser is proportional to the photoelectric current of the burst luminous power of laser diode and gives preamplifier.
Secondly, the preamplifier voltage signal that will be proportional to the burst luminous power is exported to the analog-digital converter of microcontroller by the sampling hold circuit of microcontroller.
Then, the input pin that the external terminal of microcontroller interrupts connects outside burst enable signal, when outside burst enable signal is effective, the external terminal that triggers microcontroller interrupts, and enters external terminal break in service flow process, and the start-up control device is finished the sampling of burst luminous power, the timing of setting when timer arrives, trigger regularly and interrupt, enter regularly break in service flow process, finish the calculating of burst luminous power.
Fig. 3 is that burst enables the break in service flow chart in the specific embodiment of the invention.As shown in Figure 3, burst enables the break in service flow process and may further comprise the steps:
Other interruption that step 102, the external terminal interruption of forbidding microcontroller and needs use sampled data.
Whether step 104, inquiry analog digital conversion finish, if finish then go to step 105, otherwise return step 103.
Fig. 4 is a timing break in service flow chart in the specific embodiment of the invention.As shown in Figure 4, regularly the break in service flow process comprises following step:
The specific embodiment of the invention is described the flow process of test in detail:
After the burst enable signal was effective, the external terminal that triggers microcontroller at once interrupted, thereby made microcontroller turn to burst to enable the break in service flow process.
Enable at first to forbid in the break in service flow process that in burst external terminal interrupts and other interruption, when forbidding that external terminal interrupts avoiding external terminal to interrupt frequent the generation, burst enables the continuous nested execution of break in service flow process, finally cause storehouse to overflow, flow process is run and is flown, forbid that needs use other interruption of sampled data can avoid analog to digital converter to be interrupted by it when sampling, thereby the sampled data that guarantees its use is correct.
Burst enables the break in service flow process and starts analog-digital converter then and sample, after sampling is finished, preserve the sampled result data, enable external terminal then again and interrupt to use the interruption of sampled data, withdrawing from burst at last and enabling the break in service flow process with other.
In the said process, burst enable to interrupt forbidden during, if it is effective that burst enables once more, can not trigger new interruption, promptly can not start new analog digital conversion, the calculated value of the luminous power that happens suddenly like this is not up-to-date just, but, system upgrades a secondary burst optical power value in 50 milliseconds because generally only requiring, and over a period to come, luminous power generally can not undergone mutation, and is fully passable so missed luminous power sampling several times.
Timing is attended the meeting to trigger and is regularly interrupted (being generally 50 milliseconds), and microcontroller changes regularly break in service flow process over to.Forbid at first that in timing break in service flow process external terminal interrupts, the luminous power that happens suddenly is then calculated, and enables external terminal afterwards again and interrupts, and last regularly the interruption returned.Why this break in service flow process will forbid that external terminal interrupts, and is the sampled data of preserving in the last external terminal interruption in order to protect.
For example adopt 10 analog-digital converter, then transformation result must be preserved with two bytes, suppose that ADCValue_H preserves the high byte value, ADCValue_L preserves the low byte value, the result of the last sampling is 0x0FF (ADCValue_H=0x0, ADCValue_L=0xFF), and do not forbid that during luminous power is calculated burst enables to interrupt, and a secondary burst has taken place to enable to interrupt, the new sampled value that gets is 0x100 (ADCValue_H=0x1, ADCValue_L=0x0), when calculating the burst luminous power, the value of sampling last time of ADCValue_H use just may appear so, be 0x0, and ADCValue_L uses is current recently value of interrupting sampling, also is 0x0, and the luminous power of calculating like this makes a mistake with regard to the substantial deviation actual value.
The calculating of luminous power is placed on regularly and carries out in the break in service flow process, rather than be placed on the burst enable to carry out in the break in service flow process, be because external terminal interrupts generally can the timing than 50 milliseconds interrupting taking place frequently, and luminous power calculating relates to floating-point operation, can be more consuming time, the most of the time of microcontroller all carrying out useless sampling and floating-point arithmetic operation, makes microcontroller seldom carry out other task so, greatly reduces the real-time of flow process.
The above; instrument is the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1. the device of a testing burst optical power of optical network unit, it is characterized in that, comprise laser, preamplifier and microcontroller, described laser further comprises laser diode and photodiode, described microcontroller comprises that further external terminal interrupts, control module, sampling hold circuit, analog-digital converter, data processing unit and timer, described photodiode is connected with described preamplifier, the photoelectric current that is used to export the output burst luminous power that is proportional to described laser diode is given described preamplifier, described preamplifier links to each other with described sampling hold circuit, be used for converting the input photoelectric current to be directly proportional output voltage and give described sampling hold circuit, described external terminal interrupts being connected with described control module, be used to obtain outside burst enable signal and start described control module, described control module is connected with described analog-digital converter with described sampling hold circuit respectively, be used for starting and stopping described sampling hold circuit and described analog-digital converter, finish voltage sample to described preamplifier output, described sampling hold circuit is connected with described analog-digital converter with described control module, be used to keep the output voltage of described preamplifier, described analog-digital converter and described sampling hold circuit, described control module is connected with described data processing unit, be used for that the sustaining voltage that described sampling hold circuit is exported is converted to corresponding data and send the data processing processing unit, described timer is connected with described data processing processing unit, be used for regularly log-on data processing unit, described data processing unit is connected with timer with described analog-digital converter, be used for the data of described analog-digital converter output are handled, calculate the value of burst luminous power.
2. the method for a testing burst optical power of optical network unit is characterized in that, may further comprise the steps:
A, when outside burst enables when effective, optical network unit control laser is luminous, the photodiode output in the laser is proportional to the photoelectric current of the burst luminous power of laser diode and gives preamplifier;
B, preamplifier will be proportional to the voltage signal of burst luminous power and export to the analog-digital converter of microcontroller by the sampling hold circuit of microcontroller;
The input pin that the external terminal of C, microcontroller interrupts connects outside burst enable signal, when outside burst enable signal is effective, the external terminal that triggers microcontroller interrupts, enter external terminal break in service flow process, the start-up control device is finished the sampling of burst luminous power, and the timing of setting when timer arrives, and triggers regularly and interrupts, enter regularly break in service flow process, finish the calculating of burst luminous power.
3. the method for a kind of testing burst optical power of optical network unit according to claim 2 is characterized in that, among the step C, external terminal break in service flow process further may further comprise the steps:
The external terminal of forbidding microcontroller interrupts;
The start-up control device, thus sampling hold circuit and analog-digital converter started, the voltage signal that is proportional to the burst luminous power of preamplifier output is sampled and converted data to give data processing unit processing preservation;
Again the external terminal that enables microcontroller interrupts, and enables the break in service flow process from burst and returns.
4. according to the method for claim 2 or 3 described a kind of testing burst optical power of optical network unit, it is characterized in that among the step C, regularly the break in service flow process further may further comprise the steps:
The external terminal of forbidding microcontroller interrupts;
The log-on data processing unit reads the numerical value that analog digital converting unit is preserved, and calculates the burst luminous power according to the analog-digital converter data converted of preserving, and the burst optical power value that will calculate preservation, reads for system;
Again the external terminal that enables microcontroller interrupts, and returns from timing break in service flow process.
5. the method for a kind of testing burst optical power of optical network unit according to claim 4 is characterized in that, timing is 50 milliseconds.
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| CN102355609A (en) * | 2011-10-18 | 2012-02-15 | 成都优博创技术有限公司 | Received signal strength indicator (RSSI) Trigger processing device of double-channel light module |
| CN102594445A (en) * | 2011-11-29 | 2012-07-18 | 厦门优迅高速芯片有限公司 | Emergency monitoring method and circuit for laser dispensing with backlight diodes |
| CN103475406A (en) * | 2013-08-12 | 2013-12-25 | 成都德浩科技有限公司 | ONU optical module emergent emission optical power monitoring system and monitoring method thereof |
| CN104579495A (en) * | 2014-12-17 | 2015-04-29 | 武汉电信器件有限公司 | Automatic control method for burst luminous power |
| CN110336616A (en) * | 2019-05-31 | 2019-10-15 | 武汉电信器件有限公司 | Burst reception optical power processing method, device, optical line terminal and storage medium |
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| US20080056731A1 (en) * | 2006-09-05 | 2008-03-06 | Broadlight Ltd. | Circuit for detecting optical failures in a passive optical network |
| CN101510802A (en) * | 2008-12-16 | 2009-08-19 | 成都优博创技术有限公司 | Circuit for measuring outburst mode optical signal power |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102355609A (en) * | 2011-10-18 | 2012-02-15 | 成都优博创技术有限公司 | Received signal strength indicator (RSSI) Trigger processing device of double-channel light module |
| CN102355609B (en) * | 2011-10-18 | 2014-05-14 | 成都优博创技术有限公司 | Received signal strength indicator (RSSI) Trigger processing device of double-channel light module |
| CN102594445A (en) * | 2011-11-29 | 2012-07-18 | 厦门优迅高速芯片有限公司 | Emergency monitoring method and circuit for laser dispensing with backlight diodes |
| CN103475406A (en) * | 2013-08-12 | 2013-12-25 | 成都德浩科技有限公司 | ONU optical module emergent emission optical power monitoring system and monitoring method thereof |
| CN104579495A (en) * | 2014-12-17 | 2015-04-29 | 武汉电信器件有限公司 | Automatic control method for burst luminous power |
| CN104579495B (en) * | 2014-12-17 | 2017-10-31 | 武汉电信器件有限公司 | A kind of method that luminous power that happens suddenly is automatically controlled |
| CN110336616A (en) * | 2019-05-31 | 2019-10-15 | 武汉电信器件有限公司 | Burst reception optical power processing method, device, optical line terminal and storage medium |
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Application publication date: 20100915 |