CN102299744A - Optical module with blaze protection function - Google Patents
Optical module with blaze protection function Download PDFInfo
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- CN102299744A CN102299744A CN2011102426467A CN201110242646A CN102299744A CN 102299744 A CN102299744 A CN 102299744A CN 2011102426467 A CN2011102426467 A CN 2011102426467A CN 201110242646 A CN201110242646 A CN 201110242646A CN 102299744 A CN102299744 A CN 102299744A
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Abstract
The invention discloses an optical module with a blaze protection function. The optical module comprises a light reception assembly used for receiving a light signal, a boost circuit, a current mirror device and an MCU. The boost circuit sends high voltage generated by the boost circuit to a response current output terminal of the light reception assembly through the current mirror device and a current-limiting resistor. The current mirror device receives response current outputted by the light reception assembly, and sends the response current to the MCU after zoom processing. The MCU connects with boost voltage, and adjusts high voltage amplitude outputted by the boost circuit. According to the invention, a high voltage protection circuit is designed at a receiving end of the optical module, so that when a blaze reaches, the light reception assembly is prevented from breakdown and damage, and the optical module is effectively protected. At the same time, through employing a high integrated level transmit-receive one body chip to construct a module circuit, a circuit board dimension is reduced, a SFP interface packaging form is adapted, support of a digital diagnosis function is completed, and maintenance cost of a whole is reduced.
Description
Technical field
The invention belongs to the optical communication technique field, specifically, relate 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 the OLT(Optical Line Termination of local side, optical line terminal), the ONU/ONT(Optical Network Unit/Optical Network Termination of user side, network unit/optical network terminal) and be connected ODN(Optical Distribution Network between the two, Optical Distribution Network) 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 object of the present invention is to provide a kind of optical module, avoided the problem of the breakdown damage when high light is imported of the optical fiber receive module in the optical module, improved the reliability of optical module with highlight protection function.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
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, described booster circuit transfers to the high pressure that produces the response current output of optical fiber receive module by current mirror device and current-limiting resistance; Described 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 described 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 described optical fiber receive module passes through capacity earth.
Further, described electric capacity comprises two, be connected between the response current output and ground of described 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 described optical fiber receive module near described optical fiber receive module.
Preferably, the appearance value of two described 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, described current-limiting resistance preferred cloth is located at the position of close described optical fiber receive module on the pcb board.
Further, described booster circuit connects described current mirror device by filter circuit, and the high pressure that booster circuit is exported carries out Filtering Processing.
Preferably, described optical module preferably adopts SFP interface packing forms, to support the hot plug function of optical module.Wherein, described SFP interface preferably adopts golden finger connector.
In order to satisfy of the small size designing requirement of SFP packing forms, in described 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; Described transceiver chip receives the command signal that the user sends, and then controls the luminance of described laser; The back facet current that described laser produces transfers to MCU by a high speed accumulator, to be used for the average light power between the calculated data burst period; Described optical fiber receive module is converted to the signal of telecommunication with the light signal that receives 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 by sampling hold circuit, to be used to calculate average received power.
Preferably, the back facet current output of described laser connects described transceiver chip by automatic power control circuit, so that the luminous power of control laser.
Compared with prior art; advantage of the present invention and good effect are: the present invention is by 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, improve the optical communication system reliability of operation.Meanwhile, by optical module being adopted SFP interface packing forms, realized the hot plug function of optical module.And transceiver chip by 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 finished 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 reading the detailed description of embodiment of the present invention in conjunction with the accompanying drawings, other characteristics of the present invention 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 optical module internal circuit proposed by the invention;
Fig. 3 is the structural representation that adopts the SFP interface of golden finger connector design.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention 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 by the high pressure of current mirror device output.Be packaged with avalanche photodide APD and transimpedance amplifier TIA in optical fiber receive module ROSA, optical fiber receive module ROSA receives the light signal of importing by optical fiber by its inner avalanche photodide APD, and then produces corresponding response electric current I pd with it.Described 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 by the current mirror device.In the present embodiment, after described current mirror device can be handled according to the reduce in scale of 5:1 the response current Ipd that imports, by its output output current Io, transfer to the analog-to-digital conversion interface ADC of MCU, 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 described 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 position near optical fiber receive module ROSA, near more good 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 described 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 by booster circuit output, present embodiment also is provided with filter circuit between described 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 described 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 to 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, as shown in Figure 3,10 pin Pin11-Pin20 of positive laying, reverse side is laid 10 pin Pin1-Pin10, by 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, for 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 described 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, finishes 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, receive transmission or reception control command and data that the user sends.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 by light-emitting diode among the control laser BOSA changes its luminous power, to become light signal to go out by 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 by 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 is converted to the ADC port that voltage signal transfers to MCU 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 described 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 set 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 described 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 by 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, 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 BOSA closes.At this moment, speed-sensitive switch K is controlled to close, 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 ONU of present embodiment transfers to the response current Ipd of optical fiber receive module ROSA output other one road ADC port of MCU by 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 of importing by optical fiber by its inner avalanche photodide APD, 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.
The differential data output OUT of described optical fiber receive module ROSA ,-OUT connects limiting amplifier among the transceiver chip U1 by 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 limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
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, described booster circuit transfers to the high pressure that produces the response current output of optical fiber receive module by current mirror device and current-limiting resistance; Described 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 described 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 described 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: described electric capacity comprises two; be connected between the response current output and ground of described 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 described optical fiber receive module with the external electric capacity of the response current output of described 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 described 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: described current-limiting resistance is laid in the position of close described optical fiber receive module on the pcb board.
7. according to each described optical module with highlight protection function in the claim 1 to 5, it is characterized in that: described booster circuit connects described current mirror device by filter circuit.
8. according to each described optical module with highlight protection function in the claim 1 to 5, it is characterized in that: described 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 described optical module, also be provided with laser and be integrated with laser driver and the transceiver chip of limiting amplifier with highlight protection function; Described transceiver chip receives the command signal that the user sends, and then controls the luminance of described laser; The back facet current that described laser produces transfers to MCU by a high speed accumulator; Described optical fiber receive module is converted to the signal of telecommunication with the light signal that receives 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 by 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 described laser connects described transceiver chip by automatic power control circuit.
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| 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 |
| CN103840884A (en) * | 2014-03-27 | 2014-06-04 | 上海斐讯数据通信技术有限公司 | Chip applied to GPON optical module and BOB |
| CN104301039A (en) * | 2014-09-11 | 2015-01-21 | 广西师范大学 | Local side light transmitting and receiving device based on light code division multiple access |
| CN106708157A (en) * | 2016-12-29 | 2017-05-24 | 华中科技大学 | Automatic selection device and automatic selection method for APD (avalanche photodiode) working voltages |
| CN106817164A (en) * | 2015-11-27 | 2017-06-09 | 青岛海信宽带多媒体技术有限公司 | The guard method of avalanche photodide APD and device in a kind of optical module |
| 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 |
| CN107306155A (en) * | 2016-04-20 | 2017-10-31 | 成都芯瑞科技股份有限公司 | 1 × 9 Ultra-Low Speed extra long distance optical module |
| CN107317637A (en) * | 2016-04-26 | 2017-11-03 | 苏州旭创科技有限公司 | Light-receiving component and optical module |
| CN112219330A (en) * | 2018-12-07 | 2021-01-12 | 深圳市大疆创新科技有限公司 | Laser receiving circuit, distance measuring device and mobile platform |
| CN114077018A (en) * | 2020-08-17 | 2022-02-22 | 广东海信宽带科技有限公司 | Optical module |
| CN115327712A (en) * | 2022-07-22 | 2022-11-11 | 武汉华工正源光子技术有限公司 | 200G QSFP-DD ER4 optical module |
| CN117079975A (en) * | 2023-07-28 | 2023-11-17 | 厦门亿芯源半导体科技有限公司 | High-speed TIA (wireless local area network) 5G WIFI electromagnetic interference resisting method |
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| 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 |
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| CN107317637A (en) * | 2016-04-26 | 2017-11-03 | 苏州旭创科技有限公司 | Light-receiving component and optical module |
| CN107317637B (en) * | 2016-04-26 | 2020-10-27 | 苏州旭创科技有限公司 | Light receiving module and optical module |
| 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 |
| CN107204811B (en) * | 2016-11-18 | 2020-07-07 | 索尔思光电（成都）有限公司 | Optical receiver, optical transceiver, method for protecting photoelectric detector in optical receiver |
| CN106708157B (en) * | 2016-12-29 | 2017-10-31 | 华中科技大学 | A kind of APD operating voltages automatic dialing unit and method |
| CN106708157A (en) * | 2016-12-29 | 2017-05-24 | 华中科技大学 | Automatic selection device and automatic selection method for APD (avalanche photodiode) working voltages |
| CN112219330A (en) * | 2018-12-07 | 2021-01-12 | 深圳市大疆创新科技有限公司 | Laser receiving circuit, distance measuring device and mobile platform |
| CN114077018A (en) * | 2020-08-17 | 2022-02-22 | 广东海信宽带科技有限公司 | Optical module |
| CN115327712A (en) * | 2022-07-22 | 2022-11-11 | 武汉华工正源光子技术有限公司 | 200G QSFP-DD ER4 optical module |
| CN115327712B (en) * | 2022-07-22 | 2024-03-08 | 武汉华工正源光子技术有限公司 | 200G QSFP-DD ER4 optical module |
| CN117079975A (en) * | 2023-07-28 | 2023-11-17 | 厦门亿芯源半导体科技有限公司 | High-speed TIA (wireless local area network) 5G WIFI electromagnetic interference resisting method |
| CN117079975B (en) * | 2023-07-28 | 2024-04-30 | 厦门亿芯源半导体科技有限公司 | High-speed TIA (wireless local area network) 5G WIFI electromagnetic interference resisting method |
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