CN201414128Y - Light network unit supporting digital diagnosis function - Google Patents
Light network unit supporting digital diagnosis function Download PDFInfo
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- CN201414128Y CN201414128Y CN2009200246133U CN200920024613U CN201414128Y CN 201414128 Y CN201414128 Y CN 201414128Y CN 2009200246133 U CN2009200246133 U CN 2009200246133U CN 200920024613 U CN200920024613 U CN 200920024613U CN 201414128 Y CN201414128 Y CN 201414128Y
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Abstract
The utility model discloses a light network unit supporting the digital diagnosis function, which comprises a laser device and a laser driver, wherein back light current produced by the laser device is connected with the input end of a monitoring chip through a high-speed energy storing circuit, and the high-speed energy storing circuit carries out sampling maintenance on the back light current inthe data outburst transmission period, and transmits stored electric signals to the monitoring chip after the data transmission completion in the twice outburst transmission periods for calculating the average light power in the data outburst transmission periods. At the same time, through passing response current output by a photoelectric receiver through a sampling maintaining circuit for connecting another path of the input end of the monitoring chip, the utility model realizes the monitoring and calibration on the average receiving light power. Through adopting the integral sending and receiving chip integrated with the laser driver and a limiting amplifier to be matched with a single chip with low cost for constructing a light power detecting circuit, the utility model lowers the cost of the light network unit, and meets the requirement of national light network laying.
Description
Technical field
The utility model belongs to the optical communication technology field, specifically, relates to a kind of optical network unit that can support digital diagnostic function.
Background technology
Ethernet passive optical network is EPON, is to be proposed in EFM (the Ethernet in the First Mile) research group that sets up in November, 2000 by IEEE 802.3 work groups, and its standard IEEE 802.3ah issues in June, 2004.Compare with other PON technology, the EPON technology adopts the user network topological structure that a little arrives multiple spot equally, utilizes optical fiber to realize the purpose that the full-service of data, voice and video inserts.Because the generally construction of IP network based on the fairly simple maturation of the components and parts of ethernet technology, is easier to large-scale application at present.
2008 the beginning of the year telecom operators development tactics of " light advances copper and moves back " has clearly been proposed, become today of main flow in packet network, the EPON that has inherited ethernet technology will bring into play enormous function, will promote China's informatization process effectively.Along with the large scale deployment in the world of EPON solution, the service supplier also more and more pays attention to allowing them manage and keep its network efficiency, reduce OperatingExpenditure (operation property expenditure OPEX), improve reliability, with the performance of strengthening the fault elimination ability.
Even to this day, domestic laying based on EPON is more and more, and is more and more stricter to the requirement of cost and quality.Therefore, the ONU optical network unit of realizing EPON system optical link monitoring function with very low cost has important strategic meaning and huge market prospects to the popularization of EPON system.
Under this background, realize that as how extremely low hardware cost the ethernet passive optical network unit is one of subject matter of needing to be resolved hurrily of vast optical network unit developer to the support of digital diagnostic function.
The utility model content
The purpose of this utility model is to provide a kind of optical network unit that can support digital diagnostic function, with the hardware supports of extremely low cost realization to the luminous power measuring ability.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of optical network unit of supporting digital diagnostic function comprises laser and laser driver; The back facet current that described laser produces connects the input of a monitoring chip by a high speed accumulator, described high speed accumulator during data burst transmits to the back facet current maintenance of sampling, and during data transmit end back, the transmission of two secondary bursts, the signal of telecommunication of storing is transferred to monitoring chip, to be used for the average light power between the calculated data burst period.
Further, in described high speed accumulator, include a storage capacitor, its anodal input that connects described monitoring chip on the one hand, the switch ways that passes through a speed-sensitive switch on the other hand connects the back facet current output of laser; The control end of described speed-sensitive switch connects laser driver, receive the emission enable signal of laser driver output, and when receiving effective emission enable signal, control its switch ways conducting, the back facet current that laser is produced transfers to storage capacitor, is described storage capacitor charging.
Further again, the back facet current output of described laser connects described high speed accumulator by filter circuit.
Wherein, the filtering half-convergency frequency of described filter circuit should be less than the minimal burstiness length of light signal.
Preferably, described filtered electrical routing resistance and electric capacity compose in parallel.
Further again, described laser driver receives reception or the transmission command signal that the user sends, and then generates the emission enable signal of respective electrical level state, exports described speed-sensitive switch to, control speed-sensitive switch break-make.
Further, the back facet current output of described laser connects laser driver by automatic power control circuit, to regulate the bias current that laser driver exports laser to, to keep stable average light power.
Can further realize detection in order to make optical network unit of the present utility model to descending received optical power, in described optical network unit, also include a photelectric receiver and a sampling hold circuit, the light signal generating that described photelectric receiver basis receives is the corresponding response electric current with it, and described response current connected other one road input of described monitoring chip by sampling hold circuit, to be used to calculate average received power.
Further, described sampling hold circuit adopts resistance and electric capacity to compose in parallel.
In order further to reach the purpose of design of economize on hardware cost, adopt a described optical network unit of transceiver chip design that is integrated with described laser driver and limiting amplifier, described transceiver chip connects the differential data output of photelectric receiver by capacitance, and the amplitude of the differential signal that receives is carried out exporting subsequent conditioning circuit to after the processing and amplifying.Described monitoring chip then preferably adopts a low cost single chip to realize.
Compared with prior art, advantage of the present utility model and good effect are: optical network unit of the present utility model is on the one hand by setting up the high speed accumulator, to the maintenance of sampling of the light signal under the burst mode, and then after data send end, accumulator voltage is sent to monitoring chip, the average light power of each burst bag under the uplink burst pattern is monitored and accurately measured with realization; On the other hand, by setting up sampling hold circuit,, and then transfer to monitoring chip and monitor and calibrate the maintenance of sampling of the response current of receiving terminal conversion output at receiving terminal, thereby can realize effective detection, and then finish accurate Calculation descending received optical power.By these monitoring parameters are detected in real time, can help the network manager to find out the position of breaking down in the optical fiber link, and then simplify maintenance work, improve the reliability of system.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the optical network unit that proposes of utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.
Optical network unit of the present utility model is for radiating portion optical power monitoring under the burst mode, consider that for low cost the preferred transceiver chip that laser driver and limiting amplifier are integrated in one that adopts cooperates cheaply monitoring chip (such as single-chip microprocessor MCU) to build burst transmitting optical power testing circuit; And select speed-sensitive switch for use and build high speed accumulator (perhaps directly selecting the high speed accumulator for use) according to the shortest saddlebag of EPON system, come for the maintenance of sampling of the light signal under the burst mode, when laser cuts out transmission, the voltage (corresponding with the back facet current size that laser produces) that accumulator is preserved is sent to monitoring chip, to realize the accurate measurement of average optical transmit power under the burst mode; For received optical power, selection has the reception optical device that optical signal magnitude is supported, signal pins for linearity indication carries out being resent to described special-purpose monitoring chip behind the filter shape, finishing monitoring and the calibration to receiving optical signals, thereby has realized the accurate monitoring to received optical power.Thus, existing ethernet passive optical network unit EPON ONU existing two big technical barriers have thoroughly been solved, that is: 1, realize accurate monitoring and calculate for the average light power of each burst bag under the uplink burst pattern with simple hardware circuit; 2, realize accurate the detection for descending received optical power; Thereby promoted the development of optical-fiber network technology.
Elaborate the concrete composition structure and the operation principle thereof of described optical network unit below with a specific embodiment.
Embodiment one, for common ethernet passive optical network unit, in continuous mode is used, usually needs the back facet current of laser is carried out low-pass filtering, obtains and the corresponding average current value of average optical transmit power.Yet under burst mode, laser is conducting in the relatively short time cycle only, and the length of the time that at every turn happens suddenly is also different.Therefore, the back facet current through low-pass filtering output just can not well reflect luminous power.
In order to address this problem, present embodiment has proposed a kind of transmitting optical power supervisory circuit that is applicable to burst mode, comprises chief components such as laser driver LD DRIVER, limiting amplifier LA, laser LD, monitoring chip, high-speed switching circuit and high speed accumulator.In the present embodiment, for the consideration that reduces cost, described laser driver and limiting amplifier adopt a transceiver chip U1 who is integrated with the two function to realize; Monitoring chip can adopt a low cost single chip MCU to realize; High-speed switching circuit can specifically adopt switch chip K to realize, the high speed accumulator then can select for use an electrochemical capacitor C4 to realize storage to electric charge, as shown in Figure 1.
Among Fig. 1, two differential signal inputs of transceiver chip U1 connect data receiver DATA by match circuit, receive transmission or reception control command that the client sends, and then convert high level or low level pulse signal to, as launching the control end that enable signal transfers to switch chip K, to trigger the high speed accumulator.When the user need send data, to launch enable signal and switch to effective status, such as high level state, and then the laser driver by transceiver chip U1 inside produces bias current Ibias, act on the light-emitting diode among the laser LD, the driven for emitting lights led lighting.Meanwhile, the data-signal DATA that the client sends is input to laser driver by match circuit, and then generation electric current I mod is modulated on the bias current Ibias, conducting degree by light-emitting diode among the control laser LD changes its luminous power, becomes light signal to go out by Optical Fiber Transmission with the data shift signal that the client is sent.
In laser LD, the strong and weak back facet current Imd that produces corresponding size of light that photodiode sends according to light-emitting diode, after by filter circuit back facet current Imd being carried out filter shape, the automatic power control circuit APC LOOP of leading up to feeds back to laser driver, so that the luminous power of control laser LD; Another road exports storage capacitor C4 to by the switch ways of the switch chip K of controlled conducting, the maintenance of sampling, and then carry out analog-to-digital conversion by the ADC port of MCU, realize the monitoring of average optical transmit power under the burst mode and accurately calculate to offer MCU.The current signal Bias-MON suitable with bias current Ibias is converted to other one road ADC port that voltage signal transfers to MCU behind pull down resistor R1, carry out analog-to-digital conversion after, to realize monitoring calibration to bias current Ibias.
In the present embodiment, described filter circuit can specifically adopt the RC filter network that is composed in parallel by resistance and electric capacity to realize, and is not shown.The angular frequency of filtering conversion need be estimated minimum burst length, make the inner photodiode of laser LD before Burst Period finishes, can reach stationary value, promptly, make the minimum length of time constant RC, be not less than 30nS usually less than the burst bag by selecting the parameter of resistance and electric capacity.If will obtain the exact value of the average light power during the data burst, so between burst period, should be after back facet current Imd arrive its final value (being before laser LD closes, the value of back facet current Imd), Imd samples to back facet current.
In order to keep stable average light power, need utilize automatic power control circuit APC LOOP.The back facet current Imd that described automatic power control circuit APC LOOP utilizes the diode backlight of laser LD encapsulation to produce, regulate the bias current Ibias that laser driver produces, making detected bias current Ibias and its inside establish in advance is worth reference current suitable, certain proportionate relationship, so that constant optical output power to be provided.
In the present embodiment, described laser driver has only the light of existence when output, promptly launches enable signal when effective, just drive laser LD is luminous, produce back facet current Imd, control switch chip K conducting simultaneously, by storage capacitor C4 to the back facet current Imd maintenance of sampling; When the emission enable signal was invalid, back facet current Imd was zero, illustrates that laser LD closes.At this moment, switch chip K closes, and storage capacitor C4 will sample the voltage transmission that keeps to the ADC port of MCU, with the monitoring and the calculating of the average light power that happens suddenly.
Detection for descending received optical power, the optical network unit of present embodiment transfers to the response current Ipd of photelectric receiver PIN output other one road ADC port of MCU by a sampling hold circuit, as shown in Figure 1, to realize optical network unit accurate monitoring to received optical power under continuous mode.
Among Fig. 1, photelectric receiver PIN receives the light signal of importing by optical fiber by its inner photodiode, and then produces corresponding response electric current I pd with it.After described response current Ipd is converted to voltage signal by the sampling hold circuit that is composed in parallel by resistance R 3 and capacitor C 3, the maintenance of sampling, and then the ADC port translation that transfers to MCU becomes the digital quantity of internal calibration, so that realize the monitoring calibration to average received power under the continuous mode.In described sampling hold circuit, capacitor C 3 plays the effect of low-pass filtering simultaneously to response current Ipd, with the filtering interfering pulse; The resistance of resistance R 3 need be adjusted by experiment, the incoming level scope of being supported with the ADC port that satisfies MCU, and take into full account the precision that in overall optical receives dynamic range, satisfies the SFF-8472 regulation.
Differential data output OUT, the DOUT of described photelectric receiver PIN is respectively by the limiting amplifier LA among one road capacitance C1, the C2 connection transceiver chip U1, after the amplitude of the differential signal that receives is carried out processing and amplifying, export subsequent conditioning circuit to.
In addition, meet the SFF-8472 standard, I need be provided
2The EEPROM of 256 bytes of C bus access in the present embodiment, adopts to be built-in with EEPROM and to support the MCU of 512 bytes transmission to realize its main I
2C bus (Master I
2C) be used to visit MCU and On-line Control from I
2C bus (Slave I
2C).
In addition, for the optical network unit that makes present embodiment has more monitoring function, present embodiment preferably adopt have temperature detection, supply power voltage detects and the single-chip microprocessor MCU of bias current measuring ability is set up optical network unit, thereby realized temperature, supply power voltage, laser bias current and the burst mode real-time monitoring of received optical power under emission luminous power and the continuous mode down to module.With do not compare with the integrated module of optical transceiver of monitoring function in the past, the detection of these monitoring parameters can help the network manager to find out the position of breaking down in the optical fiber link, and then simplification maintenance work, improve and improve the stability of FTTH EPON system, promote the competitiveness of EPON system in the FTTH field.
Should be noted that; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example; variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1, a kind of optical network unit of supporting digital diagnostic function comprises laser and laser driver; It is characterized in that: the back facet current that described laser produces connects the input of a monitoring chip by a high speed accumulator, described high speed accumulator during data burst transmits to the back facet current maintenance of sampling, and after data transmit end, the signal of telecommunication of storing is transferred to monitoring chip, to be used for the average light power between the calculated data burst period.
2, the optical network unit of the digital diagnostic function of support according to claim 1, it is characterized in that: in described high speed accumulator, include a storage capacitor, its anodal input that connects described monitoring chip on the one hand, the switch ways that passes through a speed-sensitive switch on the other hand connects the back facet current output of laser; The control end of described speed-sensitive switch connects laser driver, receive the emission enable signal of laser driver output, and when receiving effective emission enable signal, control its switch ways conducting, the back facet current that laser is produced transfers to storage capacitor, is described storage capacitor charging.
3, the optical network unit of the digital diagnostic function of support according to claim 1 and 2 is characterized in that: the back facet current output of described laser connects described high speed accumulator by filter circuit.
4, the optical network unit of the digital diagnostic function of support according to claim 3 is characterized in that: the filtering half-convergency frequency of described filter circuit is less than the minimal burstiness length of light signal.
5, the optical network unit of the digital diagnostic function of support according to claim 4 is characterized in that: described filtered electrical routing resistance and electric capacity compose in parallel.
6, the optical network unit of the digital diagnostic function of support according to claim 3, it is characterized in that: described laser driver receives reception or the transmission command signal that the user sends, and then the emission enable signal of generation respective electrical level state, export described speed-sensitive switch to.
7, the optical network unit of the digital diagnostic function of support according to claim 3, it is characterized in that: the back facet current output of described laser connects laser driver by automatic power control circuit, to regulate the bias current that laser driver exports laser to.
8, the optical network unit of the digital diagnostic function of support according to claim 1 and 2, it is characterized in that: in described optical network unit, also include a photelectric receiver and a sampling hold circuit, the light signal generating that described photelectric receiver basis receives is the corresponding response electric current with it, and described response current connected other one road input of described monitoring chip by sampling hold circuit, to be used to calculate average received power.
9, the optical network unit of the digital diagnostic function of support according to claim 8 is characterized in that: described sampling hold circuit adopts resistance and electric capacity to compose in parallel.
10, the optical network unit of the digital diagnostic function of support according to claim 1 and 2, it is characterized in that: described laser driver is built in the transceiver chip, in described transceiver chip, also be integrated with a limiting amplifier, connect the differential data output of photelectric receiver by capacitance; Described monitoring chip is a single-chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200246133U CN201414128Y (en) | 2009-05-04 | 2009-05-04 | Light network unit supporting digital diagnosis function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200246133U CN201414128Y (en) | 2009-05-04 | 2009-05-04 | Light network unit supporting digital diagnosis function |
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| CN201414128Y true CN201414128Y (en) | 2010-02-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299744A (en) * | 2011-08-23 | 2011-12-28 | 青岛海信宽带多媒体技术有限公司 | Optical module with blaze protection function |
| 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 |
| CN104604050A (en) * | 2014-06-30 | 2015-05-06 | 索尔思光电（成都）有限公司 | Circuit and method for burst control of laser |
| CN106953696A (en) * | 2017-05-22 | 2017-07-14 | 福建亿芯源半导体股份有限公司 | Compatible 8472 agreements, the OLT transceiver chips of digital programmable |
| CN112437360A (en) * | 2020-11-20 | 2021-03-02 | 福建中科光芯光电科技有限公司 | Method for realizing top-adjusting function through backlight |
-
2009
- 2009-05-04 CN CN2009200246133U patent/CN201414128Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299744A (en) * | 2011-08-23 | 2011-12-28 | 青岛海信宽带多媒体技术有限公司 | Optical module with blaze protection function |
| CN102299744B (en) * | 2011-08-23 | 2013-11-27 | 青岛海信宽带多媒体技术有限公司 | Optical module with blaze protection function |
| 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 |
| CN104604050A (en) * | 2014-06-30 | 2015-05-06 | 索尔思光电（成都）有限公司 | Circuit and method for burst control of laser |
| CN104604050B (en) * | 2014-06-30 | 2019-06-11 | 索尔思光电（成都）有限公司 | A kind of laser burst control circuitry and method |
| CN106953696A (en) * | 2017-05-22 | 2017-07-14 | 福建亿芯源半导体股份有限公司 | Compatible 8472 agreements, the OLT transceiver chips of digital programmable |
| CN106953696B (en) * | 2017-05-22 | 2023-03-14 | 厦门亿芯源半导体科技有限公司 | OLT (optical line terminal) transceiver integrated chip compatible with 8472 protocol and capable of being digitally programmed |
| CN112437360A (en) * | 2020-11-20 | 2021-03-02 | 福建中科光芯光电科技有限公司 | Method for realizing top-adjusting function through backlight |
| CN112437360B (en) * | 2020-11-20 | 2022-10-14 | 福建中科光芯光电科技有限公司 | Method for realizing top-adjusting function through backlight |
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Granted publication date: 20100224 |