CN202168086U - Optical module having strong light prevention function - Google Patents
Optical module having strong light prevention function Download PDFInfo
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- CN202168086U CN202168086U CN2011203082236U CN201120308223U CN202168086U CN 202168086 U CN202168086 U CN 202168086U CN 2011203082236 U CN2011203082236 U CN 2011203082236U CN 201120308223 U CN201120308223 U CN 201120308223U CN 202168086 U CN202168086 U CN 202168086U
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Abstract
The utility model discloses an optical module having a strong light prevention function, which comprises an optical reception assembly for receiving optical signals, a boost circuit, a current mirror device and an MCU. Generated high voltage is transmitted by the boost circuit to the response current output terminal of the optical reception assembly via the current mirror device and a current-limiting resistor. Response current output by the optical reception assembly is received by the current mirror device, and is transmitted to the MCU after zooming treatment. The MCU is connected with the boost circuit for adjusting the high voltage amplitude output by the boost circuit. A high voltage protection circuit is designed on the receiving terminal of the optical module, thereby protecting the optical reception assembly from penetration and damage if strong light enters so as to effectively protect the optical module. Meanwhile, a transmit-receive one body chip with a high integrated level is adopted to arrange a module circuit, so that the size of the circuit is reduced, the circuit adapts to an SFP interface packaging mode, the support for a digital diagnosis function is realized, and the maintenance cost for a system is lowered.
Description
Technical field
The utility model belongs to the optical communication technique field, specifically, relates to a kind of optical module of when receiving terminal input high light, optical fiber receive module being realized the high voltage protective function.
Background technology
Passive optical network technique (PON) is the light access technology of a kind of point to multiple spot, is the best transmission media of realizing " unification of three nets " and solving information superhighway " last kilometer ", has the integrated service access function of data, voice and video.The PON system is by OLT (the Optical Line Termination of local side; Optical line terminal), the ONU/ONT of user side (Optical Network Unit/Optical Network Termination; Network unit/optical network terminal) and the ODN (Optical Distribution Network, Optical Distribution Network) that is connected between the two form.Wherein, ethernet passive optical network EPON is ripe at present light passive access network technology, and the EPON GPON of gigabit progression is the technology of newest standardsization and commercialization.GPON uses so more can satisfy the network insertion in broadband because advantages such as higher speed, higher access performance and network efficiency, stronger flexibility and scalability can be provided.In the long run, the GPON system will become main flow, substitute the EPON system.
For present passive optical network, no matter be the OLT of local side or the ONU of user side, its inside all is provided with and is used to connect the receiving terminal of optical fiber with receiving optical signals, i.e. optical fiber receive module.In actual application; When the receiving terminal of optical module receives very strong light signal; Tend to owing to its receiving terminal circuit lacks the problem that the high voltage protective measure causes the breakdown damage of optical fiber receive module; Thereby cause the optical module fault, influenced the normal operation of passive optical network, also brought bigger economic loss simultaneously to network management merchant and client.
Summary of the invention
The purpose of the utility model is to provide a kind of optical module with highlight protection function, has avoided the problem of the breakdown damage when high light is imported of the optical fiber receive module in the optical module, has improved the reliability of optical module.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of optical module with highlight protection function; Comprise the optical fiber receive module, booster circuit, current mirror device and the MCU that are used for receiving optical signals, said booster circuit transfers to the high pressure that produces the response current output of optical fiber receive module through current mirror device and current-limiting resistance; Said current mirror device receives the response current of optical fiber receive module output, and carries out transferring to MCU after convergent-divergent is handled, and said MCU connects booster voltage, and the high pressure amplitude of booster circuit output is regulated.
In order to suppress impulse current, the response current output of said optical fiber receive module passes through capacity earth.
Further, said electric capacity comprises two, be connected between the response current output and ground of said optical fiber receive module, and wherein an electric capacity is encapsulated in the described optical fiber receive module.
Further again, be laid on the pcb board position with the external electric capacity of the response current output of said optical fiber receive module near said optical fiber receive module.
Preferably, the appearance value of two said electric capacity is all less than 1000pF, and withstand voltage is at least 2 times of maximum operating voltage of optical module receiving circuit.
Further again, said current-limiting resistance preferred cloth is located on the pcb board position near said optical fiber receive module.
Further, said booster circuit connects described current mirror device through filter circuit, and the high pressure that booster circuit is exported carries out Filtering Processing.
Preferably, said optical module preferably adopts SFP interface packing forms, to support the hot plug function of optical module.Wherein, said SFP interface preferably adopts golden finger connector.
In order to satisfy of the small size designing requirement of SFP packing forms, in said optical module, also be provided with laser and be integrated with laser driver and the transceiver chip of limiting amplifier the optical module internal circuit board; Said transceiver chip receives the command signal that the user sends, and then controls the luminance of said laser; The back facet current that said laser produces transfers to MCU through a high speed accumulator, to be used for the average light power between the calculated data burst period; Said optical fiber receive module converts the light signal that receives into the signal of telecommunication and transfers to the transceiver chip; And according to the light signal generating that receives corresponding response electric current with it; Export described MCU to through sampling hold circuit, to be used to calculate average received power.
Preferably, the back facet current output of said laser connects described transceiver chip through automatic power control circuit, so that the luminous power of control laser.
Compared with prior art; The advantage and the good effect of the utility model are: the utility model is through the receiving terminal design high tension protection circuit at optical module; Thereby when having high light to insert, can avoid the breakdown damage of optical fiber receive module; Effectively protect optical module, improved the optical communication system reliability of operation.Meanwhile, through optical module being adopted SFP interface packing forms, realized the hot plug function of optical module.And transceiver chip through adopting high integration and little encapsulation MCU cheaply make up modular circuit, have not only reduced the usage quantity of peripheral components, and more wiring space is provided, and have satisfied the small size requirement of SFP packing forms to circuit board; And accomplished the support of optical module to digital diagnostic function, and then simplified network manager's maintenance work, reduced the maintenance cost of overall optical network communicating system.
After the detailed description in conjunction with advantages the utility model execution mode, other characteristics of the utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the receiving terminal high tension protection circuit that proposes for the highlight protection function of realizing optical module;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the optical module internal circuit that proposes of the utility model;
Fig. 3 is the structural representation that adopts the SFP interface of golden finger connector design.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done explanation in further detail.
Embodiment one; Present embodiment causes the problem of the breakdown damage of its optical fiber receive module easily when high light is imported for the receiving terminal that solves optical module; Receiving terminal at optical module has designed a kind of high tension protection circuit; Referring to shown in Figure 1, mainly partly form by booster circuit, current mirror device, current-limiting resistance R22 and MCU etc.Wherein, The input of booster circuit connects DC power supply VCCT; After DC power supply VCCT carried out boosting inverter, output high pressure HV transferred to the current mirror device, transfers to the response current output of optical fiber receive module ROSA via the current-limiting resistance R22 of series connection through the high pressure of current mirror device output.In optical fiber receive module ROSA, be packaged with avalanche photodide APD and transimpedance amplifier TIA, optical fiber receive module ROSA receives the light signal through the optical fiber input through its inner avalanche photodide APD, and then produces corresponding response electric current I pd with it.Said response current Ipd is transferred to the current mirror device, and the response current Ipd to input carries out exporting after a certain proportion of convergent-divergent is handled through the current mirror device.In the present embodiment; Said current mirror device through its output output current Io, transfers to the analog-to-digital conversion interface ADC of MCU after can handling according to the reduce in scale of 5:1 the response current Ipd that imports; Perhaps pass through the independently data-interface of analog to digital converter connection MCU; Realizing that MCU detects identification to the light signal strength of input, and then produce control signal corresponding and export booster circuit to, the amplitude of the high pressure HV of booster circuit output is regulated being used for.When high light is imported; MCU control booster circuit reduces the amplitude of the high pressure HV of its output; And then the voltage of keeping the response current output that affacts optical fiber receive module ROSA is stable, realizes the high voltage protective function to avalanche photodide APD among the optical fiber receive module ROSA.
In the present embodiment, under the prerequisite of receiving sensitivity that does not influence optical fiber receive module ROSA and monitoring precision, the resistance of said current-limiting resistance R22 generally is the bigger the better, and recommendation is about 10K Ω.And, when PCB designs, preferably current-limiting resistance R22 is laid in the position near optical fiber receive module ROSA, good more closely more, to improve the protection effect.
In order to suppress rush of current, also be connected with ground capacity C23, C24 at the response current output of said optical fiber receive module ROSA, so that radio circuit to be provided, referring to shown in Figure 1.Wherein, capacitor C 24 can directly be encapsulated among the optical fiber receive module ROSA, and its appearance value generally is about hundreds of pF.When capacitor C 23 designs at PCB, reserve pad, adopt and the external mode of optical fiber receive module ROSA, and installation position is good more the closer to optical fiber receive module ROSA.If surplus sensitivity is enough, can not lay capacitor C 23.When surplus sensitivity is not enough, can weld capacitor C 23, but the suggestion of appearance value is less than 1000pF.Because when carrying out " cold start-up " test, capacitor C 23, C24 just become energy storage device, storing superincumbent energy will flow through from optical fiber receive module ROSA with shortest path, and avalanche photodide APD and transimpedance amplifier TIA are caused rush of current.The appearance value is more little, and then stored energy is more little, and corresponding rush of current is also just more little.
For stable high pressure HV through booster circuit output; Present embodiment also is provided with filter circuit between said booster circuit and current mirror device; Preferably adopt by a resistance R 21 and two Π filters that capacitor C 21, C22 form, referring to shown in Figure 1, so that high pressure HV is carried out Filtering Processing.When the said Π filter of design, resistance R 21 general values are hundreds of ohm; The appearance value of capacitor C 21, C22 is recommended as 1uF.Simultaneously, it should be noted that: capacitor C 21, C22, C23, C24 all need consider the selection of electric capacity withstand voltage, recommend withstand voltage should be 2 times of maximum operating voltage of receiving circuit in the optical module or more than.
The optical module of present embodiment preferably adopts SFP interface packing forms, to realize the hot plug function of optical module.Wherein, the SFP interface preferably adopts golden finger connector, and is as shown in Figure 3; 10 pin Pin11-Pin20 of positive laying; Reverse side is laid 10 pin Pin1-Pin10, through 20 pins are carried out interface definition, to satisfy the communicating requirement that is connected of optical module and ancillary equipment.
Because the SFP encapsulation is a kind of undersized packing forms; It has higher requirement to the PCB size of optical module; From the small size of SFP packing forms and the low cost of optical module are considered; Present embodiment when the internal circuit board of the said optical module of design, the preferred transceiver chip U1 that laser driver and limiting amplifier are integrated that adopts; MCU preferably adopts little encapsulation, low cost single chip, cooperates optical fiber receive module ROSA and laser BOSA composition module circuit then, accomplishes the support of optical module to digital diagnostic function, referring to shown in Figure 2.
Present embodiment is that example describes with the optical network unit ONU optical module of user side.Among Fig. 2, two differential signal inputs of transceiver chip U1 connect data receiver DATA, and the transmission that the reception user sends perhaps receives control command and data.When the user need send data, the laser driver among the transceiver chip U1 produced bias current Ibias, acts on the light-emitting diode among the laser BOSA, the driven for emitting lights led lighting.Meanwhile; The data-signal that the user sends is input to laser driver; And then generation electric current I mod is modulated on the bias current Ibias; Conducting degree through light-emitting diode among the control laser BOSA changes its luminous power, to become light signal to go out through Optical Fiber Transmission data shift signal.
In laser BOSA, diode backlight feeds back to laser driver according to the strong and weak back facet current Imd that produces corresponding size of light that light-emitting diode sends through automatic power control circuit APC LOOP, so that the luminous power of control laser BOSA.The current signal Bias-MON suitable with bias current Ibias converts the ADC port that voltage signal transfers to MCU into through pull down resistor R1, carry out analog-to-digital conversion after, to realize monitoring calibration to bias current Ibias.
In order to keep stable average light power, need utilize automatic power control circuit APC LOOP.The back facet current Imd that said automatic power control circuit APC LOOP utilizes the diode backlight of laser BOSA encapsulation to produce; Regulate the bias current Ibias that laser driver produces; The reference current that makes detected bias current Ibias and its inside be provided with in advance is suitable; Certain proportionate relationship, so that constant optical output power to be provided.
In order to realize the monitoring of optical network unit ONU for radiating portion luminous power under the burst mode, in said ONU, also be provided with the high speed accumulator, adopt speed-sensitive switch K and storage capacitor C4 to set up and realize, referring to shown in Figure 2.Back facet current Imd through laser BOSA output transfers to the positive pole of storage capacitor C4, the maintenance of sampling, the minus earth of storage capacitor C4 on the one hand via the switch ways of speed-sensitive switch K; Another road ADC port that transfers to MCU on the other hand carries out analog-to-digital conversion.When transceiver chip U1 receives the transmission that the user sends or receives control command, convert high level or low level pulse signal to, transfer to the control end of speed-sensitive switch K, control speed-sensitive switch K conducting as the emission enable signal.This moment, laser BOSA was by transceiver chip U1 driven for emitting lights, produced back facet current Imd, through 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, explains that laser BOSA closes.At this moment, speed-sensitive switch K is controlled to close, and the storage capacitor C4 voltage transmission that keeps to the ADC port of MCU of will sampling is with the monitoring and the calculating of the average light power that happens suddenly.
Detection for descending received optical power; The optical network unit ONU of present embodiment transfers to the response current Ipd of optical fiber receive module ROSA output other one road ADC port of MCU through a sampling hold circuit; As shown in Figure 2, to realize ONU accurate monitoring to received optical power under continuous mode.
Among Fig. 2, optical fiber receive module ROSA receives the light signal through the optical fiber input through its inner avalanche photodide APD, and then produces corresponding response electric current I pd with it.After converting said response current Ipd into voltage signal through the sampling hold circuit that composes 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 said sampling hold circuit, capacitor C 3 plays the effect of LPF simultaneously to response current Ipd, with the filtering interfering pulse; The resistance of resistance R 3 need be adjusted through 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.
The differential data output OUT of said optical fiber receive module ROSA ,-OUT connects the limiting amplifier among the transceiver chip U1 through one road capacitance C1, C2 respectively, the amplitude of the differential signal that receives is carried out processing and amplifying after, 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).
Certainly, during circuit establishment structure shown in Figure 2 is applicable to that too the PCB of the optical line terminal OLT optical module of local side designs.
In addition; For the optical module 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 module, 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 optical 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 the restriction to the 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 the essential scope of the utility model also should belong to the protection range of the utility model.
Claims (10)
1. optical module with highlight protection function; Comprise the optical fiber receive module that is used for receiving optical signals; It is characterized in that: also comprise booster circuit, current mirror device and MCU, said booster circuit transfers to the high pressure that produces the response current output of optical fiber receive module through current mirror device and current-limiting resistance; Said current mirror device receives the response current of optical fiber receive module output, and carries out transferring to MCU after convergent-divergent is handled, and said MCU connects booster voltage, and the high pressure amplitude of booster circuit output is regulated.
2. the optical module with highlight protection function according to claim 1 is characterized in that: the response current output of said optical fiber receive module passes through capacity earth.
3. the optical module with highlight protection function according to claim 2; It is characterized in that: said electric capacity comprises two; Be connected between the response current output and ground of said optical fiber receive module, and wherein an electric capacity is encapsulated in the described optical fiber receive module.
4. the optical module with highlight protection function according to claim 3 is characterized in that: be laid on the pcb board position near said optical fiber receive module with the external electric capacity of the response current output of said optical fiber receive module.
5. the optical module with highlight protection function according to claim 3 is characterized in that: the appearance value of two said electric capacity is all less than 1000pF, and withstand voltage is at least 2 times of maximum operating voltage of optical module receiving circuit.
6. according to each described optical module with highlight protection function in the claim 1 to 5, it is characterized in that: said current-limiting resistance is laid on the pcb board position near said optical fiber receive module.
7. according to each described optical module with highlight protection function in the claim 1 to 5, it is characterized in that: said booster circuit connects described current mirror device through filter circuit.
8. according to each described optical module with highlight protection function in the claim 1 to 5, it is characterized in that: said optical module adopts SFP interface packing forms, and the SFP interface adopts golden finger connector.
9. according to each described optical module in the claim 1 to 5, it is characterized in that: in said optical module, also be provided with laser and be integrated with laser driver and the transceiver chip of limiting amplifier with highlight protection function; Said transceiver chip receives the command signal that the user sends, and then controls the luminance of said laser; The back facet current that said laser produces transfers to MCU through a high speed accumulator; Said optical fiber receive module converts the light signal that receives into the signal of telecommunication and transfers to the transceiver chip, and according to the light signal generating that receives corresponding response electric current with it, exports described MCU to through sampling hold circuit.
10. the optical module with highlight protection function according to claim 9 is characterized in that: the back facet current output of said laser connects described transceiver chip through automatic power control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203082236U CN202168086U (en) | 2011-08-23 | 2011-08-23 | Optical module having strong light prevention function |
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| CN2011203082236U CN202168086U (en) | 2011-08-23 | 2011-08-23 | Optical module having strong light prevention function |
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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 |
| CN102752052A (en) * | 2012-07-23 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module of optical network unit and method for outputting control electric signal thereof |
| CN103135651A (en) * | 2013-01-25 | 2013-06-05 | 青岛海信宽带多媒体技术有限公司 | Double closed-loop based avalanche photo diode (APD) reverse bias voltage control circuit and method |
| CN103780310A (en) * | 2012-10-26 | 2014-05-07 | 深圳新飞通光电子技术有限公司 | SFP optical transmission-reception-integrating module used in OLT |
| CN104049318A (en) * | 2013-03-13 | 2014-09-17 | 深圳新飞通光电子技术有限公司 | Four-port OLT optical transmit-receive integrated module |
| CN104320200B (en) * | 2014-11-17 | 2016-11-16 | 索尔思光电（成都）有限公司 | The protection circuit of APD receptor, optical module and method |
| CN107204811A (en) * | 2016-11-18 | 2017-09-26 | 索尔思光电（成都）有限公司 | The method of photodetector in optical receiver, the optical transceiver comprising it, and protection optical receiver |
| US9923567B2 (en) | 2014-12-30 | 2018-03-20 | Huawei Technologies Co., Ltd | Analog-to-digital converter protection circuit, method for controlling analog-to-digital converter protection circuit, and controller |
| CN111510204A (en) * | 2020-04-24 | 2020-08-07 | 武汉光迅科技股份有限公司 | Protection circuit, protection method and optical module |
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2011
- 2011-08-23 CN CN2011203082236U patent/CN202168086U/en not_active Withdrawn - After Issue
Cited By (12)
| 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 |
| CN102752052A (en) * | 2012-07-23 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module of optical network unit and method for outputting control electric signal thereof |
| CN103780310A (en) * | 2012-10-26 | 2014-05-07 | 深圳新飞通光电子技术有限公司 | SFP optical transmission-reception-integrating module used in OLT |
| CN103780310B (en) * | 2012-10-26 | 2016-08-10 | 深圳新飞通光电子技术有限公司 | A kind of SFP integrated module of optical transceiver for OLT |
| CN103135651A (en) * | 2013-01-25 | 2013-06-05 | 青岛海信宽带多媒体技术有限公司 | Double closed-loop based avalanche photo diode (APD) reverse bias voltage control circuit and method |
| CN104049318A (en) * | 2013-03-13 | 2014-09-17 | 深圳新飞通光电子技术有限公司 | Four-port OLT optical transmit-receive integrated module |
| CN104320200B (en) * | 2014-11-17 | 2016-11-16 | 索尔思光电（成都）有限公司 | The protection circuit of APD receptor, optical module and method |
| US9923567B2 (en) | 2014-12-30 | 2018-03-20 | Huawei Technologies Co., Ltd | Analog-to-digital converter protection circuit, method for controlling analog-to-digital converter protection circuit, and controller |
| CN107204811A (en) * | 2016-11-18 | 2017-09-26 | 索尔思光电（成都）有限公司 | The method of photodetector in optical receiver, the optical transceiver comprising it, and protection optical receiver |
| CN111510204A (en) * | 2020-04-24 | 2020-08-07 | 武汉光迅科技股份有限公司 | Protection circuit, protection method and optical module |
| CN111510204B (en) * | 2020-04-24 | 2021-09-10 | 武汉光迅科技股份有限公司 | Protection circuit, protection method and optical module |
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