CN202183768U - Electrostatic protection structure for optical communication module, and optical network unit - Google Patents
Electrostatic protection structure for optical communication module, and optical network unit Download PDFInfo
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- CN202183768U CN202183768U CN2011203082221U CN201120308222U CN202183768U CN 202183768 U CN202183768 U CN 202183768U CN 2011203082221 U CN2011203082221 U CN 2011203082221U CN 201120308222 U CN201120308222 U CN 201120308222U CN 202183768 U CN202183768 U CN 202183768U
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Abstract
The utility model discloses an electrostatic protection structure for an optical communication module, and an optical network unit. The electrostatic protection structure for an optical communication module comprises a module housing and a laser arranged in a module. The housing of the laser is flexibly connected with the module housing via conductive foam. The electrostatic protection design of the utility model is simple in structure and easy in realization, enables static electricity to be discharged in the shortest path in a protective manner, allows the anti-static effect of an optical communication module to be improved, and allows the normal operation of the module and a system to be guaranteed. The electrostatic protection design is applied to the optical network unit and an SEP packaging mode is adopted, thereby meeting a high-standard requirement of small-dimension packaging upon the optical module in the aspect of electrostatic protection. Meanwhile, a highly integrated transmit-receive one body chip and a small packaging single-chip microcomputer with low cost are adopted to form a module circuit, thereby reducing the dimension of a circuit board, lowering the cost of the whole machine, finishing support for a digital diagnosis function and a luminescence indication function, and reducing the maintenance cost for the entire optical network communication system.
Description
Technical field
The utility model belongs to the optical communication technique field, specifically, relates to a kind of optical network unit that is applied in the electrostatic defending design in the optical communications module and adopts this electrostatic protection structure design.
Background technology
EPON, promptly ethernet passive optical network is a kind of emerging broadband access technology, it is realized that the integrated service of data, voice and video inserts, and has good and economic through a single Fiber Access System.The insider generally believes: FTTH is the final settling mode of broadband access, and EPON also will become a kind of broadband access technology of main flow.Because the characteristics of EPON network configuration; The special superiority of registering one's residence in the broadband; And with the combination of computer network, make that the expert is consistent and think that EPON is to realize " unification of three nets " and the best transmission media that solves information superhighway " last kilometer ".
Even to this day, more and more based on the laying of EPON both at home and abroad, also more and more stricter to the requirement of cost and quality.Therefore, with the optical link ONU of the EPON system optical network unit of implemented with low cost SFP packing forms, the popularization and the maintenance of EPON system had its own strategic significance and great market prospect.
To the SFP packing forms; Compare the optical network unit ONU that tradition adopts the SFF packing forms; Not only the SFP packing forms wants much little on the size of circuit board, and higher to the requirement of electrostatic defending, need on structure and circuit, carry out particular design targetedly.
Summary of the invention
The purpose of the utility model is to provide a kind of electrostatic protection structure that is applicable to optical communications module, to improve the antistatic effect of optical communications module.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of electrostatic protection structure of optical communications module comprises module housing and is built in the laser in the module that the housing of said laser is flexible coupling through conducting foam and module housing.
Further, the housing of said laser separates with the signal ground of circuit board in the optical communications module.
Preferably, an end of said conducting foam is sticked on the module housing, the other end contacts with the housing of laser, to realize being flexible coupling of module housing and laser housing.
Based on above-mentioned electrostatic defending technology; The utility model also provides a kind of optical network unit that adopts said electrostatic protection structure design; In said optical network unit, be provided with laser, the housing of said laser is flexible coupling through the shell of conducting foam and optical network unit.
Further, the housing of said laser separates with the signal ground of circuit board in the optical network unit.
Preferably, said optical network unit preferably adopts the SFP packing forms, to support the hot plug function of optical network unit module.
In order to satisfy of the small size designing requirement of SFP packing forms, in said optical network unit, also be provided with photelectric receiver, be integrated with the transceiver chip and the single-chip microcomputer of laser driver and limiting amplifier the optical network unit 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 single-chip microcomputer through a high speed accumulator, to be used for the average light power between the calculated data burst period; Said photelectric receiver 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 single-chip microcomputer to through sampling hold circuit, to be used to calculate average received power.
Further, in said high speed accumulator, include a storage capacitor, its anodal input that connects said single-chip microcomputer 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 said speed-sensitive switch connects the transceiver chip; Receive the emission enable signal of transceiver chip 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 said storage capacitor charging.
Further again, the back facet current output of said laser connects described transceiver chip through automatic power control circuit.
Further; In said optical network unit, also be provided with comparison circuit; The two-way input of said comparison circuit connects one to one with the negative terminal and a reference voltage of laser respectively, and the output of comparison circuit connects the light emission instruction signal output interface of optical network unit.
Compared with prior art; The advantage and the good effect of the utility model are: the electrostatic defending design of the utility model; Simple in structure, be easy to realize; Can guarantee that static releases away with the shortest path through protection ground, thereby improve the antistatic effect of optical communications module, guarantee the normal operation of module and optical communication system.Said electrostatic defending design is applied in the optical network unit, and adopts the interface packing forms of SFP, can satisfy small size and encapsulate optical module in the high standard requirement aspect the electrostatic defending.Simultaneously; Transceiver chip and little encapsulation low cost single chip through adopting high integration make up modular circuit; Not only reduced the circuit board size, reduced the complete machine cost, and accomplished support digital diagnostic function and luminous deixis; 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 structural representation of a kind of embodiment of the electrostatic defending design that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the optical network unit internal circuit that proposes of the utility model;
Fig. 3 is the operation principle sketch map of laser in the optical network unit;
Fig. 4 is the circuit theory diagrams of a kind of embodiment of the luminous indicating circuit of laser.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done explanation in further detail.
Embodiment one, and present embodiment has proposed a kind of electrostatic defending design of brand new, referring to shown in Figure 1 in order to improve the antistatic effect of optical communications module.The design adopts signal ground in the optical communications module and module housing 1 spaced manner is constituted electrostatic defending.At first, the housing 2 of laser is separated with signal ground in the module, adopt shell 1 conducting of mode that conducting foam 3 is flexible coupling then, form static " protection ground " housing 2 with the optical communications module of laser.Can not have influence on the circuit and the overall optical communication system of inside modules so that static is derived with the shortest path through module housing 1 thus, improve the antistatic effect of module.
Concrete design can adopt the end with conducting foam 3 to paste on the shell 1 of optical communications module; The other end suspends; Concrete paste position should guarantee after module housing 1 assembles; The other end of conducting foam 3 just contacts with housing 2 extruding of laser, has just realized the conducting of laser housing 2 with module housing 1 thus.
Adopt this electrostatic defending design can improve the antistatic effect of module; Especially be fit to be applied in the optical network unit that adopts the SFP packing forms; Promptly adopt conducting foam that the housing of laser in the shell of optical network unit and the optical network unit is flexible coupling; Under the prerequisite of the antistatic capacity that improves optical network unit, can also satisfy the limited inner space designing requirement of optical network unit of this small size packing forms.
Start from small size and low-cost consideration to the optical network unit of SFP packing forms; Present embodiment is when the internal circuit board of the said optical network unit of design; Select transceiver chip U1 that laser driver and limiting amplifier are integrated and little encapsulation, low cost single chip MCU for use; And cooperate photelectric receiver PIN and laser BOSA composition module circuit, accomplish support, referring to shown in Figure 2 to digital diagnostic function.
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 single-chip microprocessor 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 for radiating portion luminous power under the burst mode, in said optical network unit, 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 single-chip microprocessor 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 of present embodiment transfers to the response current Ipd of photelectric receiver PIN output other one road ADC port of MCU through a sampling hold circuit; As shown in Figure 2, to realize optical network unit accurate monitoring to received optical power under continuous mode.
Among Fig. 2, photelectric receiver PIN receives the light signal through the optical fiber input through its inner photodiode, 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 photelectric receiver PIN ,-OUT connects the limiting amplifier among the transceiver chip U1 through one road capacitance C1, C2 respectively, after the amplitude of the differential signal that receives is carried out processing and amplifying, exports 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 single-chip microprocessor 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).
And for the luminous deixis of optical network unit, present embodiment has then proposed circuit design scheme as shown in Figure 4.Because laser BOSA is a current device, when the forward current through it surpasses threshold current, will send laser.Fig. 3 is the typical application of semiconductor laser in present optical network unit, and wherein, the anode of semiconductor laser BOSA connects power Vcc, and negative terminal connects biasing (BIAS) and modulation (MOD) current signal.When the forward current that flows through laser BOSA surpassed threshold current, laser BOSA was luminous; When not surpassing threshold current, laser BOSA is not luminous.
In use find: semiconductor laser BOSA is luminous when turn-offing at it, and its negative terminal level can change.This characteristic of based semiconductor laser BOSA; Present embodiment is sampled to the negative terminal level of said semiconductor laser BOSA; And then itself and predefined reference voltage are compared through comparison circuit; Reflect the brand-new indicating circuit design that laser BOSA is whether luminous according to the output result of comparison circuit, thereby realized real-time monitoring the laser works state.
The physical circuit design is as shown in Figure 4, comprises a comparison circuit, specifically can adopt a high-speed comparator U2 to realize.The negative terminal LD-that one of them input (for example in-phase input end IN+) of said comparator U2 is connected laser BOSA through resistance R 2; Another one input (for example inverting input IN-) connects reference voltage Vref; Power end VCC connects the DC power supply VCCT in the optical network unit, and output Q connects the light emission instruction signal output interface of optical network unit.Comparator U2 compares through negative terminal level and the reference voltage Vref to laser BOSA; And then with the light emission instruction signal Tx_SD of the comparative result that produces as laser BOSA; Export external system to; Supply network management unit to survey and use, to show the operating state of laser in this optical network unit.
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 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. the electrostatic protection structure of an optical communications module, it is characterized in that: comprise module housing and be built in the laser in the module, the housing of said laser is flexible coupling through conducting foam and module housing.
2. the electrostatic protection structure of optical communications module according to claim 1, it is characterized in that: the housing of said laser separates with the signal ground of circuit board in the optical communications module.
3. the electrostatic protection structure of optical communications module according to claim 1 and 2, it is characterized in that: an end of said conducting foam sticks on the module housing, and the other end contacts with the housing of laser.
4. optical network unit, it is characterized in that: in said optical network unit, be provided with laser, the housing of said laser is flexible coupling through the shell of conducting foam and optical network unit.
5. optical network unit according to claim 4 is characterized in that: the housing of said laser separates with the signal ground of circuit board in the optical network unit.
6. optical network unit according to claim 4 is characterized in that: said optical network unit adopts the SFP packing forms.
7. according to each described optical network unit in the claim 4 to 6, it is characterized in that: in said optical network unit, also be provided with photelectric receiver, be integrated with the transceiver chip and the single-chip microcomputer of laser driver and limiting amplifier; 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 single-chip microcomputer through a high speed accumulator; Said photelectric receiver 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 single-chip microcomputer to through sampling hold circuit.
8. optical network unit according to claim 7; It is characterized in that: in said high speed accumulator, include a storage capacitor; Its anodal input that connects said single-chip microcomputer 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 said speed-sensitive switch connects the transceiver chip; Receive the emission enable signal of transceiver chip 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 said storage capacitor charging.
9. optical network unit according to claim 7 is characterized in that: the back facet current output of said laser connects described transceiver chip through automatic power control circuit.
10. optical network unit according to claim 7; It is characterized in that: in said optical network unit, also be provided with comparison circuit; The two-way input of said comparison circuit connects one to one with the negative terminal and a reference voltage of laser respectively, and the output of comparison circuit connects the light emission instruction signal output interface of optical network unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203082221U CN202183768U (en) | 2011-08-23 | 2011-08-23 | Electrostatic protection structure for optical communication module, and optical network unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203082221U CN202183768U (en) | 2011-08-23 | 2011-08-23 | Electrostatic protection structure for optical communication module, and optical network unit |
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| CN202183768U true CN202183768U (en) | 2012-04-04 |
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| CN2011203082221U Expired - Lifetime CN202183768U (en) | 2011-08-23 | 2011-08-23 | Electrostatic protection structure for optical communication module, and optical network unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722325A (en) * | 2019-03-20 | 2020-09-29 | 青岛海信宽带多媒体技术有限公司 | Optical module |
-
2011
- 2011-08-23 CN CN2011203082221U patent/CN202183768U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722325A (en) * | 2019-03-20 | 2020-09-29 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120404 |